Sample of drawing up an estimate for drilling a well. Methodological manual “Experience in designing water wells in the Moscow region”

Experience in designing water wells in the Moscow region

(Toolkit)
(Authors D.V. Kasatkin and G.A. Prokopovich are the developers of the collection GESN-2001-04.)

This manual discusses the methodology for compiling a bill of quantities for drawing up estimates for drilling water wells. The manual is intended for specialists involved in pricing in the field of drilling operations. It will also be useful when conducting an examination of water well drilling projects.

A project for drilling a well, as a rule, is an integral part of a project for the construction of a water intake unit. The cost takes up no more than 10% of the total cost design work. In this regard, very little attention is paid to the issue of well design in the special and regulatory literature. At the same time, drilling water wells is a highly specific type of work, which is performed by a fairly limited circle of specialists.

This work is intended for wide range specialists who, due to their line of work, are faced with the design of water well drilling. It can also be useful when conducting examinations of drilling projects, for estimators, and for students of construction and drilling specialties.

Drawing up a project for drilling a well is based on the general construction regulatory framework. However, due to its specificity, the design cannot fit into the framework proposed by the builders, since the problem under consideration is closely related to the development of subsoil, the protection of groundwater, and the increased social significance of the extracted minerals.

Methodology for compiling statements of quantities of work and drawing up estimates by type of work

The methodology for compiling statements of quantities and estimates for drilling work during the construction of water wells is tied to the 4th collection of GESN-2001 “Wells”.

Working drawings for a well, attached to the project, are called a geological and technical section or a geological and technical work order (GTN). This document, as a rule, reflects many technological details that are superfluous when drawing up bills of quantities or estimates.

The section discusses in great detail the issue of the technological cycle of rotary drilling, with calculations of equipment and materials for the work.

A statement of quantities of work and materials is presented.

The methodology discusses some issues of compiling a statement of quantities and estimates for liquidation plugging of non-self-discharging water intake wells.

The estimate and regulatory framework does not contain separate prices for this type of work. Therefore, when drawing up estimates, it is necessary to link the technological cycle to existing prices. We also note that this work examines the implementation of liquidation plugging in relation to the practice that has developed in the Moscow region. As a rule, the “Rules for liquidation plugging of drill wells for various purposes, backfilling of mine workings and abandoned wells to prevent pollution and depletion of groundwater”, approved by the Ministry of Geology of the USSR and the Ministry of Health of the USSR in 1966-67, act as a regulatory technological document.

Examples of drawing up estimates for work in wells

This section provides examples of drawing up estimates for various works in wells on a certain average section for wells of various depths and designs.

Drilling.

The section describes the rules for drawing up well designs, technological modes, methods for calculating cementation of casing pipes, as well as local estimates. The wells are 100 m deep (design 1-1¸ 1-5), 122 m (design 2-1¸ 2-5), 172 m (design 3-1¸ 3-4), 240 m (design 4-1¸ 4-3).

For drilling an artesian well with a depth of 100 m, respectively, and according to structures (with a capacity of 6, 16, 40, 65, 120 m 3 / hour), 122 m (6, 16, 40, 65, 120 m 3 / hour), 172 m (40 , 65, 120 m 3 /hour), 240 m (16, 40, 65) 17 estimates in total.

For example, design 2-3 is presented.

In Fig. 1 presents the geological and technical work order (well design), the procedure for carrying out work and the specification of materials.

Drilling of the designed wells into the Podolsko-Myachkovsky aquifer is provided for using a rotary method using a machine of the URB 3-AZ, 1BA-15V type. The design depth of the wells is 122.0 m. The operating diameter is 219 - 426 mm.

The conditions for the work are described on the design geological and technical section.

Well drilling is designed without core sampling. Geological control along the wellbore is carried out by sampling cuttings every 3-5 m of penetration and additionally when changing layers.

Drilling of rocks (interval 0.0 - 57.0 m) is carried out using colloidal clay solution, drilling through aquifers (interval 57.0 - 122.0 m) is carried out with flushing clean water.

A clay solution with a density ofr= 1.15-1.20 g/cm 3, viscosity 20-25 sec according to SPV-5, water loss 5-15 cm 3 in 30 minutes, sand content up to 4%. When opening rocks in zones of disturbances prone to landslides, the parameters of the washing liquid must be within the following limits: densityr=1.30-1.35 g/cm 3 , viscosity 21-30 sec according to SPV-5, water loss 5-10 cm 3 in 30 minutes, sand content up to 2%.

When drilling a well, a single-stage cementing method is used using two separation plugs. Cementation is carried out with Portland cement using cement mixing machines and cementing units of type 1AC-20 and 3AC-30. For pumping and pushing cement mortar special cementing units of the TsA-1.4-1-150 type are used.

Electricity is provided from existing networks, water is imported.

If there is a water supply source near the work site (watercourse, pond, mine well, quaternary well, etc.), to provide water for the drilling process, it is necessary to provide for the laying of a temporary water supply from the source to the work site.

An interval of 0-10 m is passed with a bit (cone reamer)Æ 590 mm with subsequent installation of a guide columnÆ 530 mm. The annulus of the column is cemented from the shoe to the wellhead. The cement plug is drilled out with a bitÆ 490 mm.

Drilling to a depth of 27.0 m is carried out with a tricone bitÆ 490 mm, then the passed interval is secured with a casing stringÆ 426 mm. The annulus of the column is cemented from the shoe to the wellhead. The cement plug is drilled out with a bitÆ 395 mm.

Drilling to a depth of 57.0 m is carried out with a tricone bitÆ 395 mm, then the passed interval is secured with a casing stringÆ 324 mm. The annulus of the column is cemented from the shoe to the wellhead. The cement plug is drilled out with a bitÆ 295 mm.

After cementing work, the casing strings are tested for leaks by creating internal excess pressure.

The well is drilled with a tricone bit to a design depth of 122.0 mÆ 295 mm with flushing with clean water.

The filter has an above-filter part, a working filter part and a settling tank. The design of the filter column (the position of the working and blind parts) is specified based on the actual section.

The well is washed with clean water (short-term pumping with an airlift or submersible pump), after which experimental pumping is carried out with mandatory water sampling to determine the physicochemical and bacteriological composition of the water.

Work procedure and specification of materials.

Typical design (2-3)

Work procedure

The design of the well, 122 m deep, was developed for the rotary drilling method using a 1BA-15V type rig.

Exploited aquifer: Podolsko-Myachkovsky Middle Carboniferous (C 2 pd-mc).

Rock penetration is carried out using colloidal clay solution in the interval of 0-57 m, drilling in the interval of 57-122 m is carried out with flushing with clean water.

Pipe columns are being cementedÆ 530, 426 and 324 mm with lifting of cement mortar from the shoe to the wellhead.

To clarify the geological section and the most water inflow zones in the well, geophysical work is carried out including measurements of PS, CS for each column, gamma ray logging (along the entire wellbore), caliper logging, and resistivity logging.

Filter columnÆ 219 mm is installed from 0 to 122 m with perforation at the level of aquifers.

Filter duty cycle up to 20%. The position of the working and blind parts of the filter is specified based on the GIS results.

After installing the filter column, the well is washed with clean water (short-term pumping with a submersible pump), after which experimental operational pumping is carried out. Pumping is carried out continuously at two levels. The first reduction with a flow rate 25-30% higher than designed. The second reduction is carried out with a flow rate equal to the design one. Pumping is considered completed after 16 hours after the dynamic level has stabilized and the water has completely clarified. At the end of pumping, water samples are taken for complete physical, chemical and bacteriological analyses. Pumping duration is 6 days. An ECV type pump can be used for pumping.

The well is an exploration and production one, and therefore the geological section, depth, well design, flow rate and water level position are adjusted during the drilling process.

Well design

Specification of materials

Name	Quantity
Name	Quantity	Unit, kg

Shoe D-20

Shoe D-16

Shoe D-12

Filter - T-8F1V Section length 3.1 m

Water for mixing cement. solution
Bentonite powder
Rinse water

LOCAL ESTIMATE No.
For drilling an artesian well 120 m deep

An object: Artesian well 122 m deep with a productivity of 40 cubic meters per hour (typical design 2-3)

Base: Drawings No.

Estimated cost : 552.17 thousand rubles.

Well depth: 122 m

Compiled in 2001 prices.

Price justification

Name of work and costs

Unit cost, rub.

Cost of TOTAL, rub.

TOTAL direct costs

Including

TOTAL direct costs

Including

payment for construction workers

Material resources

payment for construction workers

Operation of machines and mechanisms

Material resources

incl. payment of machinists

FER-04-01-003-3 PM-3.1; K=1.9

Rotary drilling of wells with direct flushing using machines with a diesel engine to a depth of up to 200 m in soils of group 3

FER-04-01-003-5 PM-3.1; K-1.9

Rotary drilling of wells with direct flushing using machines with a diesel engine to a depth of up to 200 m in soils of group 5

SCM, part 1, section IX, pos. 56; MOGE Manual pos.3.2.3 K=23.32;

Chisel 3-ball.45D-490S, cutter steel 18ХН3МА, paw steel 14 Х2Н3МА

FER-04-01-003-3 PM-3.1; K=1.9; Kr=0.7

Expansion of the wellbore in the range of 0-10 m to a diameter of 590 mm

´ 1.098=1.25; MOGE Manual pos.3.2.3 K=23.32;

´ 1,25

FER-04-01-003-5 PM-3.1; K=1.9; Kr=0.7

Expansion of the wellbore in the range of 0-10 m to a diameter of 590 mm

GCC USSR. Treason, wholesale. prices, reference No. 6, p. 85, item 39, k = 1.138 ´ 1.098= 1.25; MOGE Manual pos.3.2.3 K=23.32;

Roller cone expander type D-24a, 936 ´ 1,25

FSSC-1 pos. 3662 Code 109-0012

Bentonite clay

FSSC-4pos. 1755 Code 411-0001

FER-04-02-002-6 PM-3.9 K=2.3

Fastening a well with a final depth of up to 200 m during rotary drilling with pipes with a welded joint in soils of stability group 2; column diameter up to 600 mm

FER-04-02-006-10

Welding of casing pipes with outer diameter up to 530 mm

FER-04-02-007-10

Cutting of casing pipes with outer diameter up to 530 mm

FER-04-03-001-1 PM-3.12 K=1.07

Cementation of the annulus during rotary drilling with a planting depth of the cemented column up to 50 m; column diameter up to 550 mm

FER-04-04-005-1

MDS 81-33.2004

Overhead costs 112%*0.94 from payroll

Estimated profit 51% of payroll

TOTAL according to the estimate

Well abandonment.

The methodology for abandoning a well is described in the “Rules for sanitary sealing (grouting) of water wells”; the full text of the Rules is included in this manual. For liquidation plugging of an artesian well 100 m deep (design 1-1 ¸ 1-5), 122 m (design 2-1 ¸ 2-5), 172 m (design 3-1 ¸ 3-4), 240 m (design 4-1 ¸ 4-3).

Geological and technical outfit of liquidation plugging EXAMPLE OF ESTIMATE 02

Types of works on liquidation plugging and conditions for their production EXAMPLE OF ESTIMATE 03

An example of a local estimate for well abandonment EXAMPLE OF ESTIMATE 04

LOCAL ESTIMATE No.
For liquidation plugging of an artesian well with a depth of 122 m

An object:Liquidation plugging of the well (Design 2-3)

Base: Drawings No.

Estimated cost: 93.66 thousand rubles.

Well depth: 122 m

Compiled in 2001 prices.

Price justification

Name of work and costs

Unit cost, rub.

Cost of TOTAL, rub.

TOTAL direct costs

Including

TOTAL direct costs

Including

payment for construction workers

Operation of machines and mechanisms

Material resources

payment for construction workers

Operation of machines and mechanisms

Material resources

incl. payment of machinists

FER-04-01-003-5 PM-3.1; K=1

Drilling a wellbore from limestone sediments in the interval of 112-122 m with a 190 mm bit

FSSC-1 pos. 3675; 109-0025

FER-04-01-003-5 PM-3.1; K=1; Kr=0.5

Development of the wellbore in the range of 0-112 m

MDS 81-33.2004 Pis. YUT-260/06 FROM 31.01.05 K=0.94

Overhead costs for construction work 112% ´ 0.94 from payroll

MDS 81-25.2001

Estimated profit at construction work 51% of payroll

TOTAL according to the estimate

LOCAL ESTIMATE No.
To clean the wellbore and drill out the blocked part of the wellbore to a depth of 122 m

An object:Artisan well 122m deep (Design 2-3)

Base: Drawings No.

Estimated cost: 90.75 thousand rubles.

Well depth: 122 m

Compiled in 2001 prices.

Price justification

Name of work and costs

Unit cost, rub.

Cost of TOTAL, rub.

TOTAL direct costs

Including

TOTAL direct costs

Including

payment for construction workers

Operation of machines and mechanisms

Material resources

payment for construction workers

Operation of machines and mechanisms

Material resources

incl. payment of machinists

FER-04-01-003-5 PM-3.1;K=1; Kr=0.5

Development of the wellbore in the range of 0-57 m

FSSC-1 pos. 3675; 109-0025

Tricone bits type III 190.5TKZ-CV

FER-04-01-003-5 PM-3.1; K=1

Rotary drilling of wells with direct flushing using machines with a diesel engine to a depth of up to 200 m in group 5 soils with flushing with clean water

FSSC-1 pos. 3675; 109-0025

Tricone bits type III 190.5TKZ-CV

FSSC-4 pos. 1755 Code 411-0001

FER-04-04-005-1

Pumping water with a pump during rotary drilling at well depths up to 500 m

MDS 81-33.2004 Pis. YUT-260/06 FROM 31.01.05 K=0.94

Overhead 112% ´ 0.94 from payroll

Estimated profit 51% of payroll

TOTAL according to the estimate

LOCAL ESTIMATE No.
Fishing work in a well 122 m deep

An object:Artisan well 122 m deep (Structures 2-1 - 2-5)

Base: Drawings No.

Estimated cost: 22.08 thousand rubles.

Well depth: 122m

Compiled in 2001 prices.

Price justification

Name of work and costs

Unit cost, rub.

Cost of TOTAL, rub.

TOTAL direct costs

Including

TOTAL direct costs

Including

payment for construction workers

Operation of machines and mechanisms

Material resources

payment for construction workers

Operation of machines and mechanisms

Material resources

incl. payment of machinists

FER-04-02-004-1 PM-3.10 K=0.7

Free descent and ascent of fishing pipes with a coupling connection in pipes of larger diameter during rotary drilling with installations with a lifting capacity of 12.5 tons; column diameter up to 150 mm 10 flights of 57 ´ 2 m

FER-04-02-005-4ТЧ-3.11К=0.9

Extraction of pipes from a well up to 400 m deep using rotary drilling machines from soils of stability group 2; column diameter up to 200 mm

MDS 81-33.2004 Pis. YUT-260/06 FROM 31.01.05 K=0.94

Overhead 112% ´ 0.94 from payroll

Estimated profit 51% of payroll

TOTAL according to the estimate

To replace a filter column in a well

To replace a filter column in a well 100 m deep (design 1-1¸ 1-5), 122 m (design 2-1¸ 2-5), 172 m (design 3-1¸ 3-4), 240 m (design 4-1¸ 4-3) total 17 estimates

For 1-time reagent treatment of an artesian well 100 m deep (design 1-1¸ 1-5), 122 m (design 2-1¸ 2-5), 172 m (design 3-1¸ 3-4), 240 m (design 4-1¸ 4-3) total 17 estimates

For cleaning the wellbore and drilling out the blocked part of the wellbore with a depth of 100 m (design 1-1¸ 1-5), 122 m (design 2-1¸ 2-5), 172 m (design 3-1¸ 3-4), 240 m (design 4-1¸ 4-3).

For fishing work

in wells 100 m deep, 122 m ( EXAMPLE OF LOCAL ESTIMATE 5), 172 m, 240 m.

LOCAL ESTIMATE No.
Fishing work in a well 122 m deep

An object:Artisan well 122 m deep (Design 2-3)

Base: Drawings No.

Estimated cost: 22.08 thousand rubles.

Well depth: 122 m

Compiled in 2001 prices.

Price justification

Name of work and costs

Unit cost, rub.

Cost of TOTAL, rub.

TOTAL direct costs

Including

TOTAL direct costs

Including

payment for construction workers

Operation of machines and mechanisms

Material resources

payment for construction workers

Operation of machines and mechanisms

Material resources

incl. payment of machinists

FER-04-02-004-1 PM-3.10 K=0.7

FER-04-02-005-4 PM-3.11 K=0.9

Extraction of pipes from a well up to 400 m deep using rotary drilling machines from soils of stability group 2; column diameter up to 200 mm

Estimated profit 51% of payroll

TOTAL according to the estimate

Typical design (2-3)

TYPES OF WORK ON LIQUIDATION CAMPING AND CONDITIONS OF THEIR PRODUCTION

Sanitary sealing of the well is carried out in accordance with the current “Rules for liquidation plugging of drill wells for various purposes, backfilling of mine workings and abandoned wells to prevent pollution and depletion of groundwater.”

The work is carried out in two stages: I - preparation, II - sealing.

1. Installation of the drilling rig above the wellhead.

2. Dismantling the ECV pump -

3. Conducting borehole geophysical surveys (actual depth, condition of production and filter columns) -

4. Drilling out rubble in a well (10 m).

5. Cleaning the walls of the production filter column in the range of 0-122 m from corrosion, build-up and siltation.

6. Removing the filter column d=219 mm, installed in the interval 0-122 m.

7. Flushing the wellbore with a solution of bleach with a dose of active chlorine of at least 125 mg/l by mixing and replacing the water in the well in an amount of 3 volumes of the wellbore. Contact chlorine with water for at least 4 hours.

Well volume: V CKB = 0.785(d 1 2 h 1 +d 2 2 h 2 +...+d n 2 h n)

Volume of solution: Vp 1 =V CKB´ 3 ´ l,l.

Amount of bleach: P 1 = Vp 1´ 0,5

Duration of disinfection is 1 day.

8. Pumping water from the well using an airlift until the water quality is stabilized - clarification, chloride content, stability of the composition. Duration of pumping - 3 days.

9. Disinfection of building materials that will be poured into the well is carried out with a solution of bleach with a dose of active chlorine of at least 100 mg/l of water by dousing the building materials and mixing with shovels.

Volume of building materials: V page mat. = V gravel + V sand

Volume of solution: Vp 2 = V page mat. ´ 4 ´ 1.5. Amount of bleach: P 2 = Vp 2´ 0,5

10. The required amount of water is calculated using the formula: V water = V r 1 + V r 2 + V water for cement

1. The wellbore in the interval of the exploited aquifer is filled with washed and disinfected material (gravel, crushed stone) from 122 m to 55 m, then to a height of 3 m (55-52 m) it is filled with washed and disinfected sand (with compaction).

2. Installation of a cement bridge in the interval of 52-47 m (cement mortar composition 1:0.5). (WTC - 3 days).

7. After the cement mortar has hardened, a hole of size 1 is dug around the wellbore´ 1 ´ 1=1 m 3, which is filled with cement mortar of composition 1:3.

8. The well number and grouting date are stamped on the cement slab.

9. Upon completion of the work, a report on the sanitary sealing of the well is drawn up.

WELL CHARACTERISTICS

1. Location:

2. Well number:

3. Organization that carried out the drilling:

4. Year of construction:

5. Absolute mark of the wellhead:

6. Well depth: 122 m.

7. Exploited aquifer: Podolsko-Myachkovsky v. Middle Carboniferous (C 2 pd-mc)

8. Static level while drilling:

9. Well productivity at the time of drilling:

10 Static level at the time of the examination:

11. Well productivity at the time of the survey:

SPECIFICATION OF MATERIALS
	Name of materials
	Oil cement
	Filter material
	Quartz sand

	Bleaching powder

COMPOSITION OF CEMENT MORTAR
Name of materials	Concentration
Name of materials
Oil cement
sifted sand

Reagent treatments

This section describes reagents for well recovery, equipment and technology for reagent treatment of wells.

In total, the manual contains 21 drawings and 89 local estimates.

The company "LIMISH" provides drilling and maintenance services for water wells, in which an estimate for the well is necessarily drawn up. For clients, we provide affordable prices for all types of services, convenient forms of payment and a guarantee for the work performed. To assess the scope of work and the cost of drilling a well, a company specialist comes to the customer’s site, inspects the site and drilling location, and then draws up an estimate for approval.

Cost Factors

There are several cost factors to consider. For example, licenses and special permissions may be required. Equipment or tools may need to be purchased or rented. Mandatory expenses include the cost of materials and chemical and bacteriological analysis. Prices for permits, licenses, labor, water testing and materials may vary depending on the type of drilling and hydrogeological characteristics of the site. The quality of the material and water can also affect the overall cost. The size and type of water supply system also affect the overall cost of drilling.

An example of an estimate for a well

We were given the specific task of cleaning and flushing the water intake well, installing automated system water level control.
The list of works is as follows:

Dismantling of water equipment.
Dismantling of the deep pump ETsV.
Cleaning, washing, airlift.
Dismantling the pump.
Installation of a deep pump with water level control. Install submersible pump.
Installation and connection of automatic water level control.
Setting up the automation system.
Additional work, returning the water intake to operation.

Well estimate - example:

To make it easier for you to understand the features of drawing up an estimate for the construction of a well, we will give an example from our own practice.

Estimate for the work

№	Name of materials	Unit measurements	Qty	Cost, rub.
1.1	Pump EVTS 10-65-110nrk (customer requirements)	PC.	1	95 000
1.2	Dry running sensors	PC.	6	7 200
1.3	runway cable	m	400	35 000
1.4	Remote control Pilot 400	PC.	1	18 000
1.5	HDPE pipe 32	m	100	5 500
1.6	PVS cable 3 x 2.5	m	150	10 000
1.7	Scotch	PC.	1	600
1.8	Water level alarm	PC.	1	10 000
1.9	Heat shrink	PC.	8	4 500
1.10	Truck crane	change	1	15 000
	Name of works
2.1	Installation / dismantling of pumping equipment	complex of works		25 000
2.2		complex of works		15 000
2.3	Washing of a 20 m3 tank (1 pc.)	complex of works		15 000
2.4	Pump commissioning	complex of works		5 000
2.5		complex of works		BONUS (when replacing the pump)
2.6	Connecting a water timer	complex of works		10 000

Please note: the above well estimate is an example that we have provided to guide potential clients. The indicated prices are higher than the average cost of our work, which is due to the special requirements and difficult conditions of the customer.

What documents are drawn up?

Drilling operations are based on the preparation of documentation. Development and filling are carried out by experienced specialists, which guarantees high accuracy and efficiency of execution. This includes:

technical project;
geological outfits;
technical outfits;
regime-technological and regulatory maps;
cost calculations.

Development of a technical project includes filling out three sections:

Section No. 1: brief content of the problem, options for solving it, information on drilling approvals.
Section No. 2: description of technical measures to develop options for improving the quality of water intake facilities. In this section, deadlines and material costs are noted. Line graphs are drawn up.
Section No. 3: description of hydrogeological and environmental features region, environmental assessment.

The estimate for the construction of a well is drawn up taking into account the material costs of the installation and the order of work. The document displays the following costs for preparation for drilling:

preparing a site for a drilling rig;
arrangement of access roads;
construction of utilities for connecting drilling equipment.

A separate estimate for a water well is drawn up taking into account the costs of installation and dismantling of drilling equipment. In total, the estimate documentation reflects the following categories of costs:

taking into account the time of work on arrangement of water intake;
taking into account the depth and diameter of the water intake;
for testing, sampling and analysis;
taking into account the drilling method.

When carrying out work in winter, the cost of drilling a water intake may increase.

What other parameters are taken into account?

When drawing up an estimate for a well, various parameters are taken into account: terrain characteristics, groundwater level, design features of the water intake, and the diameter of the casing pipes. When forming the final total cost, the type of water is taken into account. The cost will be lower when working with waters located at shallow depths (about 3 meters). If drilling is carried out to a greater depth and we are talking about working with ground and interstratal waters or constructing artesian wells, the total estimated cost will increase.

When developing a water intake project, our company’s specialists conduct thorough studies of aquifers in terms of waterproof base, reservoir thickness and roof. Subject to research rocks, which are the foundation that covers the source of water. This is also taken into account when drawing up estimates for the well.

Conclusion

Drawing up an estimate for a water well is a complex process that takes into account a huge number of nuances. By independently calculating the cost of arranging a water intake, you will only get an approximate figure.

If you need to find out the exact total price for drilling and arrangement of a water intake, contact our company’s specialists for help, who will make an assessment and draw up an estimate in a short time. The quality, honesty and availability of the services we offer have already been appreciated by many customers. Join us too!

Well development is a complex engineering task that involves proper calculation of parameters, selection and installation of equipment. Therefore, before you start drilling, you need to find a worthy professional contractor who will responsibly approach the construction of a well from design to completion of work.

Many companies offer their services, but the cost and quality may vary significantly. In order to draw up a small competitive list and find a contractor with the ideal ratio of quality and price, you need an estimate for the construction of a well. Any organization must provide this document before starting work, since it is the estimate that reflects the name, cost and quantity of equipment that will be required during the work. The estimate for developing a well will help determine the budget required to create an individual source.

What does the cost estimate for well construction look like and what does it imply?

The estimate for the construction of a well is a standard document that has a prescribed form. It reflects everything necessary equipment, number of units and price, as well as the list and cost of services for their installation.

The set of equipment and list of services, as well as the final cost of the entire estimate, may differ depending on the depth of the well and the volume of work to be done. The approximate estimate for the construction of a well with a 30-meter pump load and the use of Italian equipment looks like this:

	Name of equipment	Quantity
	Submersible pump with cable
	Heading
	Pressure switch
	Steel cable
	Cable clamps

	Check valve
	Brass nipple
	Hydraulic accumulator
	Brass tee
	Brass futor
	Pressure gauge
	Reinforced hose
	Detachable coupling
	Ball valve PP 32
	Ball valve butterfly
	Tee PP 32
	Compression coupling
	Pipe PP 32
	Consumables


Installation of caisson
Hydraulic communications device
Installing a hydraulic accumulator
Installation and configuration of automation
Commissioning works

All documents presented in the catalog are not their official publication and are intended for informational purposes only. Electronic copies of these documents can be distributed without any restrictions. You can post information from this site on any other site.

Experience in designing water wells in the Moscow region

(Toolkit)
(Authors D.V. Kasatkin and G.A. Prokopovich are the developers of the collection GESN-2001-04.)

A project for drilling a well, as a rule, is an integral part of a project for the construction of a water intake unit. The cost takes up no more than 10% of the total cost of design work. In this regard, very little attention is paid to the issue of well design in the special and regulatory literature. At the same time, drilling water wells is a highly specific type of work, which is performed by a fairly limited circle of specialists.

This work is intended for a wide range of specialists who, due to the nature of their activities, are faced with the design of drilling water wells. It can also be useful when conducting examinations of drilling projects, for estimators, and for students of construction and drilling specialties.

Methodology for compiling statements of quantities of work and drawing up estimates by type of work

The methodology for compiling statements of quantities and estimates for drilling work during the construction of water wells is tied to the 4th collection of GESN-2001 “Wells”.

The section discusses in great detail the issue of the technological cycle of rotary drilling, with calculations of equipment and materials for the work.

A statement of quantities of work and materials is presented.

The methodology discusses some issues of compiling a statement of quantities and estimates for liquidation plugging of non-self-discharging water intake wells.

Examples of drawing up estimates for work in wells

This section provides examples of drawing up estimates for various works in wells on a certain average section for wells of various depths and designs.

Drilling.

For example, design 2-3 is presented.

In Fig. 1 presents the geological and technical work order (well design), the procedure for carrying out work and the specification of materials.

The conditions for the work are described on the design geological and technical section.

Well drilling is designed without core sampling. Geological control along the wellbore is carried out by sampling cuttings every 3-5 m of penetration and additionally when changing layers.

Drilling of rocks (interval 0.0 - 57.0 m) is carried out using colloidal clay solution, drilling through aquifers (interval 57.0 - 122.0 m) is carried out with flushing with clean water.

When drilling a well, a single-stage cementing method is used using two separation plugs. Cementation is carried out with Portland cement using cement mixing machines and cementing units of type 1AC-20 and 3AC-30. For pumping and pushing cement mortar, special cementing units of the TsA-1.4-1-150 type are used.

Electricity is provided from existing networks, water is imported.

After cementing work, the casing strings are tested for leaks by creating internal excess pressure.

The well is drilled with a tricone bit to a design depth of 122.0 mÆ 295 mm with flushing with clean water.

The filter has an above-filter part, a working filter part and a settling tank. The design of the filter column (the position of the working and blind parts) is specified based on the actual section.

Work procedure and specification of materials.

Typical design (2-3)

Work procedure

The design of the well, 122 m deep, was developed for the rotary drilling method using a 1BA-15V type rig.

Exploited aquifer: Podolsko-Myachkovsky Middle Carboniferous (C 2 pd-mc).

Rock penetration is carried out using colloidal clay solution in the interval of 0-57 m, drilling in the interval of 57-122 m is carried out with flushing with clean water.

Pipe columns are being cementedÆ 530, 426 and 324 mm with lifting of cement mortar from the shoe to the wellhead.

Filter columnÆ 219 mm is installed from 0 to 122 m with perforation at the level of aquifers.

Filter duty cycle up to 20%. The position of the working and blind parts of the filter is specified based on the GIS results.

The well is an exploration and production one, and therefore the geological section, depth, well design, flow rate and water level position are adjusted during the drilling process.

Well design

Specification of materials

Name	Quantity
Name	Quantity	Unit, kg

Shoe D-20

Shoe D-16

Shoe D-12

Filter - T-8F1V Section length 3.1 m

Water for mixing cement. solution
Bentonite powder
Rinse water

LOCAL ESTIMATE No.
For drilling an artesian well 120 m deep

An object: Artesian well 122 m deep with a productivity of 40 cubic meters per hour (typical design 2-3)

Base: Drawings No.

Estimated cost : 552.17 thousand rubles.

Well depth: 122 m

Compiled in 2001 prices.

Price justification

Name of work and costs

Unit cost, rub.

Cost of TOTAL, rub.

TOTAL direct costs

Including

TOTAL direct costs

Including

payment for construction workers

Material resources

payment for construction workers

Operation of machines and mechanisms

Material resources

incl. payment of machinists

FER-04-01-003-3 PM-3.1; K=1.9

Rotary drilling of wells with direct flushing using machines with a diesel engine to a depth of up to 200 m in soils of group 3

FER-04-01-003-5 PM-3.1; K-1.9

Rotary drilling of wells with direct flushing using machines with a diesel engine to a depth of up to 200 m in soils of group 5

SCM, part 1, section IX, pos. 56; MOGE Manual pos.3.2.3 K=23.32;

Chisel 3-ball.45D-490S, cutter steel 18ХН3МА, paw steel 14 Х2Н3МА

FER-04-01-003-3 PM-3.1; K=1.9; Kr=0.7

Expansion of the wellbore in the range of 0-10 m to a diameter of 590 mm

´ 1.098=1.25; MOGE Manual pos.3.2.3 K=23.32;

´ 1,25

FER-04-01-003-5 PM-3.1; K=1.9; Kr=0.7

Expansion of the wellbore in the range of 0-10 m to a diameter of 590 mm

GCC USSR. Treason, wholesale. prices, reference No. 6, p. 85, item 39, k = 1.138 ´ 1.098= 1.25; MOGE Manual pos.3.2.3 K=23.32;

Roller cone expander type D-24a, 936 ´ 1,25

FSSC-1 pos. 3662 Code 109-0012

Bentonite clay

FSSC-4pos. 1755 Code 411-0001

FER-04-02-002-6 PM-3.9 K=2.3

Fastening a well with a final depth of up to 200 m during rotary drilling with pipes with a welded joint in soils of stability group 2; column diameter up to 600 mm

FER-04-02-006-10

Welding of casing pipes with outer diameter up to 530 mm

FER-04-02-007-10

Cutting of casing pipes with outer diameter up to 530 mm

FER-04-03-001-1 PM-3.12 K=1.07

Cementation of the annulus during rotary drilling with a planting depth of the cemented column up to 50 m; column diameter up to 550 mm

FER-04-04-005-1

MDS 81-33.2004

Overhead costs 112%*0.94 from payroll

Estimated profit 51% of payroll

TOTAL according to the estimate

Well abandonment.

Geological and technical outfit of liquidation plugging EXAMPLE OF ESTIMATE 02

Types of works on liquidation plugging and conditions for their production EXAMPLE OF ESTIMATE 03

An example of a local estimate for well abandonment EXAMPLE OF ESTIMATE 04

LOCAL ESTIMATE No.
For liquidation plugging of an artesian well with a depth of 122 m

An object:Liquidation plugging of the well (Design 2-3)

Base: Drawings No.

Estimated cost: 93.66 thousand rubles.

Well depth: 122 m

Compiled in 2001 prices.

Price justification

Name of work and costs

Unit cost, rub.

Cost of TOTAL, rub.

TOTAL direct costs

Including

TOTAL direct costs

Including

payment for construction workers

Operation of machines and mechanisms

Material resources

payment for construction workers

Operation of machines and mechanisms

Material resources

incl. payment of machinists

FER-04-01-003-5 PM-3.1; K=1

Drilling a wellbore from limestone sediments in the interval of 112-122 m with a 190 mm bit

FSSC-1 pos. 3675; 109-0025

FER-04-01-003-5 PM-3.1; K=1; Kr=0.5

Development of the wellbore in the range of 0-112 m

MDS 81-33.2004 Pis. YUT-260/06 FROM 31.01.05 K=0.94

Overhead costs for construction work 112% ´ 0.94 from payroll

MDS 81-25.2001

Estimated profit for construction work is 51% of the payroll