CN113914852A - Rapid evaluation method for optimal horizontal segment length of horizontal well - Google Patents
Rapid evaluation method for optimal horizontal segment length of horizontal well Download PDFInfo
- Publication number
- CN113914852A CN113914852A CN202010653972.6A CN202010653972A CN113914852A CN 113914852 A CN113914852 A CN 113914852A CN 202010653972 A CN202010653972 A CN 202010653972A CN 113914852 A CN113914852 A CN 113914852A
- Authority
- CN
- China
- Prior art keywords
- horizontal
- unit
- length
- horizontal well
- segment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000011156 evaluation Methods 0.000 title claims description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 49
- 238000011234 economic evaluation Methods 0.000 claims abstract description 36
- 238000013461 design Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000011161 development Methods 0.000 claims abstract description 15
- 230000003247 decreasing effect Effects 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims description 28
- 239000003921 oil Substances 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000010779 crude oil Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 9
- 239000012530 fluid Substances 0.000 description 5
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Theoretical Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Fluid Mechanics (AREA)
- Geometry (AREA)
- Computer Hardware Design (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention provides a method for quickly evaluating the length of an optimal horizontal segment of a horizontal well. The method for quickly evaluating the length of the optimal horizontal segment of the horizontal well comprises the following steps: investment measuring and calculating steps: carrying out investment measurement and calculation on the bit pressure design of different horizontal section lengths of the horizontal well, and determining the relationship between the lengths of the different horizontal sections of the horizontal well and development investment; capacity prediction: establishing a single-stage capacity decreasing model and a single-stage maximum capacity calculating model, and carrying out initial capacity measurement and calculation on the bit pressure design of different horizontal segment lengths of the horizontal well; and (3) economic evaluation steps: according to the investment measuring and calculating step and the capacity predicting step, carrying out economic evaluation on the bit pressure design of different horizontal segment lengths of the horizontal well under the condition of stepped oil price; establishing a template: and determining the length range of the economic horizontal section of the horizontal well and the length of the optimal economic horizontal section according to the economic evaluation step. The invention solves the problem of inaccurate economic evaluation of the horizontal well.
Description
Technical Field
The invention is suitable for the technical field of development of unconventional conglomerate oil reservoir horizontal wells, and particularly relates to a method for quickly evaluating the length of an optimal horizontal segment of a horizontal well.
Background
In the aspect of horizontal well development, the investment value of drilling and production engineering is estimated by measuring and calculating the expected economic benefit of the horizontal well development by applying a cash flow model, and the influence of the horizontal section length of the horizontal well on the bit pressure investment value is ignored. At present, no strong-adaptability, convenient and quick economic evaluation method exists, and the drilling pressure design of the horizontal well is optimized by evaluating the development value of the horizontal well through the horizontal segment length of the horizontal well.
At present, the economic evaluation of a horizontal well development project is mainly carried out by calculating the internal yield according to the parameters such as investment, cost, productivity, oil price, commodity rate, tax and the like and a cash flow model to evaluate the economic benefit of the horizontal well. The method ignores the influence of the mutual relation among the horizontal segment length, the investment and the productivity of the horizontal well on the economic benefit, and cannot determine the optimal horizontal segment length of the horizontal well.
From the above, the problem that the economic evaluation of the horizontal well is inaccurate exists in the prior art.
Disclosure of Invention
The invention mainly aims to provide a method for quickly evaluating the optimal horizontal section length of a horizontal well, so as to solve the problem that the economic evaluation of the horizontal well in the prior art is inaccurate.
In order to achieve the purpose, the invention provides a method for quickly evaluating the length of an optimal horizontal segment of a horizontal well, which comprises the following steps: investment measuring and calculating steps: carrying out investment measurement and calculation on the bit pressure design of different horizontal section lengths of the horizontal well, and determining the relationship between the lengths of the different horizontal sections of the horizontal well and development investment; capacity prediction: establishing a single-stage capacity decreasing model and a single-stage maximum capacity calculating model, and carrying out initial capacity measurement and calculation on the bit pressure design of different horizontal segment lengths of the horizontal well; and (3) economic evaluation steps: according to the investment measuring and calculating step and the capacity predicting step, carrying out economic evaluation on the bit pressure design of different horizontal segment lengths of the horizontal well under the condition of stepped oil price; establishing a template: and determining the length range of the economic horizontal section of the horizontal well and the length of the optimal economic horizontal section according to the economic evaluation step.
Further, the investment measuring and calculating step comprises comprehensive investment measuring and calculating of a straight well section and a deflecting section and comprehensive investment measuring and calculating of a horizontal section.
Further, the calculation formula of the horizontal segment comprehensive investment measurement is as follows:
wherein ,IZThe unit is element for comprehensive investment of the horizontal section; FI is the comprehensive investment of a vertical well section and a deflecting section, and the unit is Yuan/m; l' is the length of the horizontal section of the horizontal well designed by different drilling pressures, and the unit is meter; VI is the comprehensive investment of the reference horizontal segment, and the unit is element; and L is the length of the reference horizontal section and has the unit of meter.
Further, the calculation formula of the single-stage capacity decreasing model is as follows:
qn＝-d×(n-1)+q0；
wherein ,qnThe unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day; n is a staged fracturing stage, and stages are divided from a horizontal well landing point; q. q.s0The capacity of the first-stage fracturing section close to the landing site of the horizontal well is also the maximum capacity of the reference single-stage, and the unit is ton/day.
Further, the calculation formula of the reference single-stage maximum capacity calculation model is as follows:
wherein ,q0The unit is ton/day; q is the designed productivity of the reference horizontal well, and the unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day; n is a staged fracturing stage, the stage is divided from a horizontal well landing point, and n is L/L; l is the length of the reference horizontal section and the unit is meter; l is the length of the single-stage fracturing segment, and the unit is meter.
Further, the calculation formula for measuring and calculating the initial capacity of the bit pressure design of different horizontal section lengths of the horizontal well is as follows:
wherein Q' is the initial capacity of the horizontal well designed by different drilling pressures, and the unit is ton/day; n ' is a staged fracturing stage number designed by different drilling pressures of the horizontal well, and n ' is L '/L; l' is the length of the horizontal section of the horizontal well designed by different drilling pressures, and the unit is meter; l is the length of the single-stage fracturing segment, and the unit is meter; q. q.s0The unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day.
Further, the economic evaluation comprises calculating the net present value and the internal yield of the weight-on-bit design of different horizontal section lengths of the horizontal well through a cash flow model according to the cash inflow and the cash outflow.
Further, the calculation formula of the cash flow model is as follows:
wherein NPV is net present value and unit is ten thousand yuan; CI is cashInflow in units of ten thousand yuan; CO is cash outflow and has unit of ten thousand yuan; i.e. i0The yield is the standard yield of the industry and the unit is%; t is the evaluation year of the economic evaluation; IRR is internal yield in%.
Further, the cash inflow is calculated by the following formula:
CIt＝Qt×Pt×β+OTt；
wherein ,CItThe cash inflow in the t year is ten thousand yuan; qtThe unit of oil production of the horizontal well in the t year is ten thousand tons; ptThe unit is yuan/ton which is the selling price of the crude oil in the t year; beta is the commodity rate of crude oil, and the unit is percent; OTtThe unit is ten thousand yuan for the sales tax of the t year.
Further, the cash outflow is calculated by the following formula:
COt＝Izt+Cjt+STt+ITt+VTt+Aft；
wherein ,COtThe cash flow in ten thousand yuan of the t year; iztThe unit is ten thousand yuan for comprehensive investment of a horizontal section; cjtThe operation cost in the t year is ten thousand yuan; ST (ST)tThe business tax and the addition in the t year are in ten thousand yuan; IT (information technology) devicetThe unit is ten thousand yuan for the cost income tax of the t year; VTtThe unit is ten thousand yuan of the value-added tax of the t year; aftFor the disposal cost, the unit is ten thousand yuan.
Further, the length of the economic horizontal section is greater than or equal to the minimum horizontal section length corresponding to the reference internal yield under the condition of the stepped oil price and is less than or equal to the maximum horizontal section length corresponding to the reference internal yield under the condition of the stepped oil price.
Further, the length of the optimal economic horizontal segment is the length of the horizontal segment corresponding to the maximum internal yield under the condition of the stepped oil price.
By applying the technical scheme of the invention, the relation between the lengths of different horizontal sections of the horizontal well and the investment of the horizontal well is determined by carrying out investment measurement and calculation on the bit pressure design of different horizontal section lengths of the horizontal well, and a single-stage capacity decrement model and a single-stage maximum capacity calculation model are simultaneously established, so that the initial capacity measurement and calculation are carried out on the bit pressure design of different horizontal section lengths of the horizontal well, and then the economic evaluation is carried out on the bit pressure design of different horizontal section lengths of the horizontal well under the condition of stepped oil price according to the investment measurement and the capacity prediction, so that the influence of the mutual relation among the horizontal section length, the investment and the capacity on the economic benefit is considered in the economic evaluation, and the economic horizontal section length range and the optimal economic horizontal section length obtained according to the economic evaluation are more accurate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow chart of a method for rapidly evaluating the optimal horizontal segment length of a horizontal well in the invention;
fig. 2 shows a schematic diagram of a horizontal well economic horizon length evaluation template in an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
The invention provides a method for quickly evaluating the optimal horizontal segment length of a horizontal well, aiming at solving the problem that the economic evaluation of the horizontal segment length of the horizontal well in the prior art is inaccurate.
As shown in fig. 1, the invention provides a method for quickly evaluating the length of an optimal horizontal segment of a horizontal well, which comprises the following steps: investment measuring and calculating steps: carrying out investment measurement and calculation on the bit pressure design of different horizontal section lengths of the horizontal well, and determining the relationship between the lengths of the different horizontal sections of the horizontal well and development investment; capacity prediction: establishing a single-stage capacity decreasing model and a single-stage maximum capacity calculating model, and carrying out initial capacity measurement and calculation on the bit pressure design of different horizontal segment lengths of the horizontal well; and (3) economic evaluation steps: according to the investment measuring and calculating step and the capacity predicting step, carrying out economic evaluation on the bit pressure design of different horizontal segment lengths of the horizontal well under the condition of stepped oil price; establishing a template: and determining the length range of the economic horizontal section of the horizontal well and the length of the optimal economic horizontal section according to the economic evaluation step.
The method comprises the steps of carrying out investment measurement and calculation on the bit pressure designs of different horizontal segment lengths of the horizontal well, determining the relation between the lengths of the different horizontal segments of the horizontal well and the investment of the horizontal well, simultaneously establishing a single-stage capacity decreasing model and a single-stage maximum capacity calculating model, carrying out initial capacity measurement and calculation on the bit pressure designs of the different horizontal segment lengths of the horizontal well, carrying out economic evaluation on the bit pressure designs of the different horizontal segment lengths of the horizontal well under the condition of stepped oil price according to the investment measurement and capacity prediction, and considering the influence of the mutual relation among the horizontal segment length, the investment and the capacity on economic benefits in the economic evaluation, so that the economic horizontal segment length range and the optimal economic horizontal segment length obtained according to the economic evaluation are more accurate.
Based on the characteristics of the investment composition of the volume fracturing engineering of the horizontal well, the invention calculates and establishes the relationship between the lengths of different horizontal sections of the horizontal well and the development investment under the condition of determining the lengths of a straight well section and a deflecting section.
In this embodiment, the investment measuring and calculating step includes a vertical section-deflecting section comprehensive investment measuring and calculating step and a horizontal section comprehensive investment measuring and calculating step.
Specifically, the main investments of the comprehensive investment of the vertical shaft section and the deflecting section are as follows:
1) pre-drilling engineering cost: the method mainly comprises the expenses of well site roads, drilling rig foundations, well team relocation and the like;
2) drilling engineering cost: the method mainly comprises the following steps of drilling machine daily cost, drilling engineering material cost, material transportation cost, directional service cost, top drive service cost and other cost;
3) well cementation project cost: mainly comprises well cementation operation cost, casing cost, well cementation engineering material cost and the like;
4) logging engineering cost: mainly the well logging engineering cost of a straight well section and an inclined section.
5) Logging engineering cost: mainly the well logging engineering cost of a straight well section and an inclined section.
The comprehensive investment calculation of the straight well section and the deflecting section is the sum of the engineering cost, and the investment of the parts can be regarded as fixed investment of horizontal well development or investment before a horizontal well landing point.
Specifically, the main investments of the horizontal segment comprehensive investment are as follows:
1) horizontal section drilling engineering cost: the method mainly comprises the following steps of drilling machine daily fee, drilling engineering material fee, material transportation fee, directional service fee, top drive service fee and other fees;
2) horizontal section cementing project cost: mainly comprises well cementation operation cost, casing cost, well cementation engineering material cost and the like;
3) horizontal section logging engineering cost: mainly the logging engineering cost of the horizontal section;
4) horizontal section logging engineering cost: mainly the logging engineering cost of the horizontal section;
5) horizontal well fracturing material cost: the fracturing fluid mainly comprises fracturing fluid (guanidine gum fracturing fluid and slickwater), propping agent (quartz sand and ceramsite), acid liquor, capsule gel breaker and other materials;
6) horizontal well fracturing material transportation cost: mainly comprises proppant transportation cost and transportation cost of fracturing fluid;
7) horizontal well fracturing operation cost: the method mainly comprises the fracturing operation cost, the liquid distribution cost and the winter construction additional cost;
8) horizontal well fracturing other costs: well cementation bridge plug fracturing technology service, drilling plug expense.
Wherein, the investment of the horizontal section mainly depends on the length of the horizontal section and the size of the fracturing. Therefore, the calculation formula of the level segment comprehensive investment measurement is as follows:
wherein ,IZThe unit is element for comprehensive investment of the horizontal section; FI is the comprehensive investment of a vertical well section and a deflecting section, and the unit is Yuan/m; l' is the length of the horizontal section of the horizontal well designed by different drilling pressures, and the unit is meter; VI is the comprehensive investment of the reference horizontal segment, and the unit is element; and L is the length of the reference horizontal section and has the unit of meter.
The general calculation of the comprehensive investment of the volume fracturing schemes of different horizontal section lengths of the horizontal well can be realized through the calculation formula of the comprehensive investment calculation of the horizontal sections. And the comprehensive investment approximate calculation of the horizontal well with different horizontal section lengths of the same development unit horizontal well can be met. The error is less than 5 percent, and the requirement of the investment approximate calculation economic evaluation of the oil field horizontal well drilling engineering is met.
In order to measure and calculate the initial capacity of the bit pressure design of different horizontal segment lengths of the horizontal well, a single-stage capacity decreasing model and a single-stage maximum capacity calculating model need to be established.
In a practical horizontal well development model, horizontal sections are produced by staged fracturing. The horizontal well can not guarantee that each level of perforation fracturing section can normally supply liquid and produce, and the longer the horizontal section is, the occupation ratio of the ineffective fracturing well section can be increased relatively. Considering the influence of complex factors such as hydraulics principle, shaft sand setting, well wall friction resistance and the like, along with the increase of the length of the horizontal section, the production pressure difference is reduced, the fluid friction resistance is increased, the single-stage capacity is in a decreasing trend along with the increase of the stage number of the fracturing section, and the closer to the fracturing section of the landing point of the horizontal well, the larger the single-stage capacity is.
According to the above principle experience, the calculation formula of the single-stage capacity decreasing model is as follows:
qn＝-d×(n-1)+q0；
wherein ,qnFor single-stage productionUnit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day; n is a staged fracturing stage, and stages are divided from a horizontal well landing point; q. q.s0The capacity of the first-stage fracturing section close to the landing site of the horizontal well is also the maximum capacity of the reference single-stage, and the unit is ton/day.
The calculation formula of the single-stage maximum productivity calculation model is as follows:
wherein ,q0The unit is ton/day; q is the designed productivity of the reference horizontal well, and the unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day; n is a staged fracturing stage, the stage is divided from a horizontal well landing point, and n is L/L; l is the length of the reference horizontal section and the unit is meter; l is the length of the single-stage fracturing segment, and the unit is meter.
Through a single-stage maximum productivity calculation model and a single-stage productivity decreasing model, a calculation formula for measuring and calculating the initial productivity through the bit pressure design of different horizontal section lengths of the horizontal well can be obtained:
wherein Q' is the initial capacity of the horizontal well designed by different drilling pressures, and the unit is ton/day; n ' is a staged fracturing stage number designed by different drilling pressures of the horizontal well, and n ' is L '/L; l' is the length of the horizontal section of the horizontal well designed by different drilling pressures, and the unit is meter; l is the length of the single-stage fracturing segment, and the unit is meter; q. q.s0The unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day.
By establishing a single-stage maximum productivity calculation model and a single-stage productivity decreasing model, a theoretical basis is provided for measuring and calculating the productivity of the drilling pressure design of the horizontal well at different horizontal segment lengths, and the productivity prediction problem of the drilling pressure design of the horizontal well at different horizontal segment lengths is solved. And providing support for determining the length range of the economic horizontal segment and the length of the optimal economic horizontal segment.
Based on investment budget and capacity prediction of the weight-on-bit design of the horizontal well with different horizontal segment lengths, economic evaluation under the conditions of multiple schemes and step oil prices is carried out according to indexes such as production cost, tax and the like of the current development unit, net present values and internal profitability of the weight-on-bit design of the horizontal well with different horizontal segment lengths are determined, and data support is provided for establishing an optimal horizontal segment length evaluation template.
In this embodiment, the economic evaluation includes calculating the net present value and the internal rate of return for different horizontal segment length designs of the horizontal well based on the cash inflow and cash outflow through a cash flow model.
Specifically, the calculation formula of the cash flow model is as follows:
wherein NPV is net present value and unit is ten thousand yuan; CI is cash inflow, and the unit is ten thousand yuan; CO is cash outflow and has unit of ten thousand yuan; i.e. i0The yield is the standard yield of the industry and the unit is%; t is the evaluation year of the economic evaluation; IRR is internal yield in%.
Specifically, the cash inflow calculation formula is as follows:
CIt＝Qt×Pt×β+OTt；
wherein ,CItThe cash inflow in the t year is ten thousand yuan; qtThe unit of oil production of the horizontal well in the t year is ten thousand tons; ptThe unit is yuan/ton which is the selling price of the crude oil in the t year; beta is the commodity rate of crude oil, and the unit is percent; OTtThe unit is ten thousand yuan for the sales tax of the t year.
Specifically, the cash flow is calculated by the following formula:
COt＝Izt+Cjt+STt+ITt+VTt+Aft；
wherein ,COtThe cash flow in ten thousand yuan of the t year; iztThe unit is ten thousand yuan for comprehensive investment of a horizontal section; cjtThe operation cost in the t year is ten thousand yuan; ST (ST)tThe business tax and the addition in the t year are in ten thousand yuan; IT (information technology) devicetThe unit is ten thousand yuan for the cost income tax of the t year; VTtThe unit is ten thousand yuan of the value-added tax of the t year; aftFor the disposal cost, the unit is ten thousand yuan.
As shown in table 1, in one embodiment of the present invention, the net present value NPV and the internal rate of return IRR of the weight-on-bit design for different horizontal section lengths of the horizontal well were calculated according to the cash flow model by calculating the cash outflow and cash inflow per year in the evaluation period (10 years).
TABLE 1 economic evaluation result table for different horizontal well segment length schemes
As shown in fig. 2, based on the economic evaluation results of the weight-on-bit design of the horizontal well with different horizontal segment lengths, an evaluation template of the economic horizontal segment length range and the optimal economic horizontal segment length is established.
What needs to be determined first is the range of economic horizontal segment lengths. In the present embodiment, the internal rate of return IRR is the most important reference factor in the economic evaluation, and therefore, the calculation formula of the economic level segment length range is:
(Lmaxmin＝[(IRR,Lmin(),(IRR,Lmax()))])；
wherein IRR is the benchmark internal yield under the condition of step oil price, and the unit is percent; l isminThe length of the minimum horizontal section corresponding to the reference yield is taken as the unit of meter; l ismaxThe length of the maximum horizontal segment corresponding to the reference yield is the unit of meter.
According to the calculation formula of the length range of the economic horizontal segment, the length of the economic horizontal segment is greater than or equal to the minimum horizontal segment length corresponding to the reference internal yield under the condition of the step oil price and is less than or equal to the maximum horizontal segment corresponding to the reference internal yield under the condition of the step oil price.
And determining the length of the optimal economic horizontal segment on the basis of determining the length range of the economic horizontal segment. The calculation formula of the optimal economic horizontal segment length is as follows:
L＝(IRRmax,())；
wherein ,IRRmaxThe maximum internal yield under the condition of the step oil price is expressed in units of percent; l is IRRmaxThe corresponding horizontal well length is in meters.
According to the calculation formula of the optimal economic horizontal segment length, the optimal economic horizontal segment length is the horizontal segment length corresponding to the maximum internal yield under the condition of step oil price.
According to the evaluation template, as shown in fig. 2, when the reference profitability is 6%, the length of the economic horizontal segment ranges from 1000 meters to 1900 meters, and the length of the optimal economic horizontal segment is 1400 meters.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the investment composition of the volume fracturing project of the horizontal well is finely divided, and the investment measurement and calculation of the bit pressure design of different horizontal segment lengths of the horizontal well are determined.
2. The decreasing rule of the fracturing subsection productivity of the horizontal well is determined, and a drilling pressure design productivity measuring and calculating model of different horizontal section lengths of the horizontal well is established.
3. On the basis of a cash flow economic evaluation model, an economic horizontal well segment length range evaluation template is established, a basis is provided for optimizing horizontal well drilling pressure design, and commercial value analysis of horizontal well development investment is highlighted.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for quickly evaluating the length of an optimal horizontal segment of a horizontal well is characterized by comprising the following steps of:
investment measuring and calculating steps: carrying out investment measurement and calculation on the bit pressure design of different horizontal section lengths of the horizontal well, and determining the relationship between the lengths of the different horizontal sections of the horizontal well and development investment;
capacity prediction: establishing a single-stage capacity decreasing model and a single-stage maximum capacity calculating model, and carrying out initial capacity measurement and calculation on the bit pressure design of different horizontal segment lengths of the horizontal well;
and (3) economic evaluation steps: according to the investment measuring and calculating step and the capacity predicting step, carrying out economic evaluation on the bit pressure design of different horizontal section lengths of the horizontal well under the condition of stepped oil price;
establishing a template: and determining the length range of the economic horizontal section of the horizontal well and the length of the optimal economic horizontal section according to the economic evaluation step.
2. The method for rapidly evaluating the length of the optimal horizontal segment of the horizontal well according to claim 1, wherein the investment measurement and calculation step comprises comprehensive investment measurement and calculation of a straight well segment and an inclined segment and comprehensive investment measurement and calculation of a horizontal segment.
3. The method for rapidly evaluating the length of the optimal horizontal segment of the horizontal well according to claim 2, wherein the calculation formula of the comprehensive investment measurement of the horizontal segment is as follows:
wherein ,IZThe unit is element for comprehensive investment of the horizontal section; FI is the comprehensive investment of a vertical well section and a deflecting section, and the unit is Yuan/m; l' is the length of the horizontal section of the horizontal well designed by different drilling pressures, and the unit is meter; VI is the comprehensive investment of the reference horizontal segment, and the unit is element; and L is the length of the reference horizontal section and has the unit of meter.
4. The method for rapidly evaluating the optimal horizontal segment length of the horizontal well according to claim 1, wherein a calculation formula of the single-stage productivity decreasing model is as follows:
qn＝-d×(n-1)+q0；
wherein ,qnThe unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day; n is a staged fracturing stage, and stages are divided from a horizontal well landing point; q. q.s0The capacity of the first-stage fracturing section close to the landing site of the horizontal well is also the maximum capacity of the reference single-stage, and the unit is ton/day.
5. The method for rapidly evaluating the length of the optimal horizontal segment of the horizontal well according to claim 4, wherein the single-stage maximum productivity calculation formula is as follows:
wherein ,q0The unit is ton/day; q is the designed productivity of the reference horizontal well, and the unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day; n is a staged fracturing stage, the stage is divided from a horizontal well landing point, and n is L/L; l is the length of the reference horizontal section and the unit is meter; l is the length of the single-stage fracturing segment, and the unit is meter.
6. The method for rapidly evaluating the length of the optimal horizontal segment of the horizontal well according to claim 1, wherein a calculation formula for predicting the initial production performance of the bit pressure design of different horizontal segment lengths of the horizontal well is as follows:
wherein Q' is the initial capacity of the horizontal well designed by different drilling pressures, and the unit is ton/day; n ' is a staged fracturing stage number designed by different drilling pressures of the horizontal well, and n ' is L '/L; l' is the length of the horizontal section of the horizontal well designed by different drilling pressures, and the unit is meter; l is the length of the single-stage fracturing segment, and the unit is meter; q. q.s0The unit is ton/day; d is the increment and decrement of single-stage capacity, and the unit is ton/day.
7. The method for rapidly evaluating the optimal horizontal segment length of the horizontal well according to claim 1, wherein the economic evaluation comprises calculating the net present value and the internal yield of the weight-on-bit design of different horizontal segment lengths of the horizontal well through a cash flow model according to the cash inflow and the cash outflow.
8. The method for rapidly evaluating the length of the optimal horizontal segment of the horizontal well according to claim 7, wherein a calculation formula of the cash flow model is as follows:
wherein NPV is net present value and unit is ten thousand yuan; CI is cash inflow, and the unit is ten thousand yuan; CO is cash outflow and has unit of ten thousand yuan; i.e. i0The yield is the standard yield of the industry and the unit is%; t is the evaluation year of the economic evaluation; IRR is internal yield in%.
9. The method for rapidly evaluating the optimal horizontal segment length of the horizontal well according to claim 8, wherein the calculation formula of the cash inflow amount is as follows:
CIt＝Qt×Pt×β+OTt；
wherein ,CItThe cash inflow in the t year is ten thousand yuan; qtThe unit of oil production of the horizontal well in the t year is ten thousand tons; ptThe unit is yuan/ton which is the selling price of the crude oil in the t year; beta is the commodity rate of crude oil, and the unit is percent; OTtThe unit is ten thousand yuan for the sales tax of the t year.
10. The method for rapidly evaluating the optimal horizontal segment length of the horizontal well according to claim 8, wherein the calculation formula of the cash outflow amount is as follows:
COt＝Izt+Cjt+STt+ITt+VTt+Aft；
wherein ,COtThe cash flow in ten thousand yuan of the t year; iztThe unit is ten thousand yuan for comprehensive investment of a horizontal section; cjtFor the operating cost of the t yearThe bits are ten thousand yuan; ST (ST)tThe business tax and the addition in the t year are in ten thousand yuan; IT (information technology) devicetThe unit is ten thousand yuan for the cost income tax of the t year; VTtThe unit is ten thousand yuan of the value-added tax of the t year; aftFor the disposal cost, the unit is ten thousand yuan.
11. The method for quickly evaluating the length of the optimal horizontal segment of the horizontal well according to claim 1, wherein the length of the economic horizontal segment is greater than or equal to the length of the minimum horizontal segment corresponding to the reference internal rate of return under the stepped oil price condition and is less than or equal to the length of the maximum horizontal segment corresponding to the reference internal rate of return under the stepped oil price condition.
12. The method for quickly evaluating the length of the optimal horizontal segment of the horizontal well according to claim 1, wherein the length of the optimal economic horizontal segment is the length of the horizontal segment corresponding to the maximum internal yield under the stepped oil price condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010653972.6A CN113914852B (en) | 2020-07-08 | 2020-07-08 | Quick evaluation method for optimal horizontal section length of horizontal well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010653972.6A CN113914852B (en) | 2020-07-08 | 2020-07-08 | Quick evaluation method for optimal horizontal section length of horizontal well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113914852A true CN113914852A (en) | 2022-01-11 |
| CN113914852B CN113914852B (en) | 2023-09-26 |
Family
ID=79231888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010653972.6A Active CN113914852B (en) | 2020-07-08 | 2020-07-08 | Quick evaluation method for optimal horizontal section length of horizontal well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113914852B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114547748A (en) * | 2022-02-25 | 2022-05-27 | 西安石油大学 | Horizontal well staged fracturing technology construction scheme optimization design method and system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005024371A (en) * | 2003-07-01 | 2005-01-27 | Japan Steel Works Ltd:The | Hydrogen embrittlement cracking determination method for material used under high-temperature high-pressure hydrogen environment |
| CN104563993A (en) * | 2013-10-11 | 2015-04-29 | 中国石油大学(北京) | Staged fracturing or synchronous fracturing simulation experiment method for shale horizontal well |
| CN104963673A (en) * | 2015-07-13 | 2015-10-07 | 中国石油大学(北京) | Visual experimental device for simulating temporary hydraulic fracture plugging of fiber diverter |
| CN105332680A (en) * | 2014-07-01 | 2016-02-17 | 中国石油化工股份有限公司 | Device and method for simulating fracturing of horizontal well |
| CN107429552A (en) * | 2015-02-24 | 2017-12-01 | 特种油管有限责任公司 | The method that cross drilling is formed from main well bore |
| CN108612518A (en) * | 2018-04-20 | 2018-10-02 | 重庆地质矿产研究院 | Method for determining drilling and hydraulic fracturing parameters of radial micro-well bore of coal-bed gas well |
| CN111027211A (en) * | 2019-12-10 | 2020-04-17 | 中国石油大学(华东) | Dense reservoir fluid simulation method considering pore throat limitation mechanism and application of dense reservoir fluid simulation method in gas injection development simulation |
-
2020
- 2020-07-08 CN CN202010653972.6A patent/CN113914852B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005024371A (en) * | 2003-07-01 | 2005-01-27 | Japan Steel Works Ltd:The | Hydrogen embrittlement cracking determination method for material used under high-temperature high-pressure hydrogen environment |
| CN104563993A (en) * | 2013-10-11 | 2015-04-29 | 中国石油大学(北京) | Staged fracturing or synchronous fracturing simulation experiment method for shale horizontal well |
| CN105332680A (en) * | 2014-07-01 | 2016-02-17 | 中国石油化工股份有限公司 | Device and method for simulating fracturing of horizontal well |
| CN107429552A (en) * | 2015-02-24 | 2017-12-01 | 特种油管有限责任公司 | The method that cross drilling is formed from main well bore |
| CN104963673A (en) * | 2015-07-13 | 2015-10-07 | 中国石油大学(北京) | Visual experimental device for simulating temporary hydraulic fracture plugging of fiber diverter |
| CN108612518A (en) * | 2018-04-20 | 2018-10-02 | 重庆地质矿产研究院 | Method for determining drilling and hydraulic fracturing parameters of radial micro-well bore of coal-bed gas well |
| CN111027211A (en) * | 2019-12-10 | 2020-04-17 | 中国石油大学(华东) | Dense reservoir fluid simulation method considering pore throat limitation mechanism and application of dense reservoir fluid simulation method in gas injection development simulation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114547748A (en) * | 2022-02-25 | 2022-05-27 | 西安石油大学 | Horizontal well staged fracturing technology construction scheme optimization design method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113914852B (en) | 2023-09-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8473268B2 (en) | Method for comparing and back allocating production | |
| Birchenko et al. | Reduction of the horizontal well's heel–toe effect with inflow control devices | |
| Birchenko et al. | Application of inflow control devices to heterogeneous reservoirs | |
| EP2739813B1 (en) | System and method for quantifying stimulated rock quality in a wellbore | |
| CN110359904A (en) | The non-homogeneous complex fracture parameter inversion method and equipment of multistage pressure break horizontal well | |
| CN101236619A (en) | Oil gas proved reserve value estimation method | |
| CN109816148A (en) | A kind of water controlled field development project discrete optimizing method | |
| CN113914852B (en) | Quick evaluation method for optimal horizontal section length of horizontal well | |
| Ignatyev et al. | Multistage hydraulic fracturing in horizontal wells as a method for the effective development of gas-condensate fields in the arctic region | |
| US20230229981A1 (en) | Star rating management method and system for deployment and implementation of gas field development wells | |
| CN106156876A (en) | The Forecasting Methodology of waterflooding development oil reservoir ultra-high water-containing later stage natural declining rate | |
| Veatch | Economics of fracturing: Some methods, examples, and case studies | |
| CN114417564B (en) | Shale oil horizontal well fracturing parameter optimization method | |
| Yu | A new methodology to forecast solution gas production in tight oil reservoirs | |
| Tang et al. | Intelligent plunger lift: Digital and cost-effective solution to unlock gas potential in a large tight gas field in China | |
| Schubarth et al. | Optimizing Unconventional Completion Designs: A New Engineering-and Economics-Based Approach | |
| Gupta et al. | Haynesville shale: predicting long-term production and residual analysis to identify well intereference and frac hits | |
| Sinchitullo et al. | Integrated Royalties Model to Promote the Exploration and Exploitation of Tight Oil Reservoirs in the North West of Peru | |
| Kuncir et al. | Analysis and optimal design of gas storage reservoirs | |
| Abel | ANALYSIS OF IPR CURVES IN NORTH SLOPE HORIZONTAL PRODUCERS SUPPORTED BY WATERFLOOD | |
| Ahmed et al. | Understanding Your Wells: Conventional Nodal Analysis; Not a Solution for Depleting Fields | |
| CN108898507B (en) | Method for predicting workload of hole repairing and layer changing measures of oil production well | |
| Mollman | Dimensionless Recovery Profiles | |
| Bryan | Mechanistic Model Validation of Decline Curve Analysis for Unconventional Reservoirs | |
| Joshi et al. | Production Diagnostic Type Curves for Performance Evaluation: An Extension of the Universal Type Curve Approach |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |