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CN109858174A - Low-permeability oil deposit high angle hole Productivity and device - Google Patents

Low-permeability oil deposit high angle hole Productivity and device Download PDF

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Publication number
CN109858174A
CN109858174A CN201910122327.9A CN201910122327A CN109858174A CN 109858174 A CN109858174 A CN 109858174A CN 201910122327 A CN201910122327 A CN 201910122327A CN 109858174 A CN109858174 A CN 109858174A
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China
Prior art keywords
reservoir
well
permeability
oil
low
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CN201910122327.9A
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Chinese (zh)
Inventor
李云鹏
张祝新
王东林
刘阳
李新民
刘东成
姜玲玲
李雅雯
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Petrochina Co Ltd
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Petrochina Dagang Oilfield Co
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Priority to CN201910122327.9A priority Critical patent/CN109858174A/en
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Abstract

The embodiment of the present invention provides a kind of low-permeability oil deposit high angle hole Productivity, this method comprises: obtaining underlying parameter;The underlying parameter that will acquire brings following formula into calculate low-permeability oil deposit high angle hole production capacity:Wherein, Q is that high angle hole predicts production capacity, μ0For viscosity of crude, hsThe length for being high angle hole in pay interval, K are oil reservoir absolute permeability, GrFor starting pressure gradient, reFor supply oil radius, rwFor wellbore radius, SpFor the quasi- skin factor that hole deviation generates, StFor the true skin factor that reservoir damage generates, PeFor supply pressure, PwfFor producing well bottom pressure.The problems such as this method lacks relevant parameter using existing formula predictions production capacity, proposes a kind of new method for quickly carrying out high-inclination directional well AOF calculation, can accurately calculate low-permeability oil deposit high angle hole production capacity by the new calculation method.

Description

Method and device for calculating capacity of low-permeability oil reservoir highly-deviated well
Technical Field
The invention relates to oil deposit productivity calculation, in particular to a method and a device for calculating the productivity of a highly deviated well of a low-permeability oil deposit.
Background
The high-inclination well is a special drilling technology developed on the basis of a directional well, and can realize one well with double targets or multiple targets by utilizing the high-inclination directional well technology and drill through a longer oil layer well section. The highly deviated well is a technology with wide application prospect, is an effective means for developing low-permeability oil reservoirs and difficultly-mined reserves, brings great benefit to oil field development by the development of the highly deviated well, and brings a brand-new concept to development and design.
The accurate prediction of the large-inclination directional well energy production is an important basis for reasonably developing low-permeability oil reservoirs. Many scholars at home and abroad research mathematical expressions for describing the productivity of highly deviated wells, and most of productivity prediction mathematical expressions are related to basic geological parameters (oil layer thickness, permeability, viscosity and the like) of an oil reservoir, development modes (production pressure difference, well spacing and the like) and starting pressure gradient. In the basic geological parameters, the development mode and the starting pressure gradient of the oil reservoir, the basic geological parameters and the development mode of the oil reservoir need to be determined through fine oil reservoir geological research, the starting pressure gradient is determined through experiments, but for an actual block of an oil field, because original data of the block is deficient, in the capacity prediction, the starting pressure gradient parameters are not supported by experimental data, and the capacity cannot be effectively predicted.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for calculating the capacity of a low-permeability reservoir highly-deviated well.
In order to achieve the above object, an embodiment of the present invention provides a method for calculating the capacity of a highly deviated well of a low permeability reservoir, including:
acquiring basic parameters;
substituting the acquired basic parameters into the following formula to calculate the productivity of the highly deviated well of the low-permeability reservoir:
wherein Q is the predicted productivity of the highly deviated well, mu0Is the viscosity of the crude oil, hsLength of highly deviated well in producing interval, K is absolute permeability of reservoir, GrTo initiate the pressure gradient, reTo supply the oil of radius, rwIs the borehole radius, SpPseudoepidermal factor, S, generated for well deviationtTrue skin factor, P, for reservoir damageeTo supply pressure, PwfIs the bottom hole pressure of the production well.
Optionally, the start-up pressure gradient GrDetermining according to pre-stored low permeability reservoir test data and the following relational expression:
Gr=0.491×(K/μ0)-0.5423
wherein K is the absolute permeability of the oil layer, mu0Is the crude oil viscosity.
Optionally, the well deviation produces a pseudo-skin factor SpCalculated according to the following formula:
true skin factor S of the reservoir damagetCalculated according to the following formula:
wherein theta is the well inclination angle, K is the absolute permeability of the oil layer, KdTo the absolute permeability of the reservoir in the damaged area, rdThe radius of the contamination zone.
The invention also provides a low permeability reservoir highly deviated well productivity calculation device, which comprises:
a data acquisition unit for acquiring basic parameters;
the controller is connected with the data acquisition unit and used for substituting the basic parameters acquired by the data acquisition unit into the following formula to calculate the low permeability reservoir highly deviated well productivity:
wherein Q is the predicted productivity of the highly deviated well, mu0Is the viscosity of the crude oil, hsLength of highly deviated well in producing interval, K is absolute permeability of reservoir, GrTo initiate the pressure gradient, reTo supply the oil of radius, rwIs the borehole radius, SpPseudoepidermal factor, S, generated for well deviationtTrue skin factor, P, for reservoir damageeTo supply pressure, PwfIs the bottom hole pressure of the production well.
Optionally, the start-up pressure gradient GrAccording to the pre-stored low permeability reservoir test data and the following relational expressionDetermining:
Gr=0.491×(K/μ0)-0.5423
wherein K is the absolute permeability of the oil layer, mu0Is the crude oil viscosity.
Optionally, the well deviation produces a pseudo-skin factor SpCalculated according to the following formula:
true skin factor S of the reservoir damagetCalculated according to the following formula:
wherein theta is the well inclination angle, K is the absolute permeability of the oil layer, KdTo the absolute permeability of the reservoir in the damaged area, rdThe radius of the contamination zone.
According to the technical scheme, after the relevant parameters are obtained, the productivity of the low-permeability reservoir highly-deviated well can be rapidly calculated through the calculation formula provided in the technical scheme, and the predicted productivity value obtained through calculation is close to the actual productivity, so that the productivity of the low-permeability reservoir highly-deviated well can be rapidly, effectively and accurately calculated.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a graph of startup pressure gradient versus fluidity provided by an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
According to the method, a mean equal-thickness stratum vertical well productivity formula ① is derived by taking a low-permeability oil reservoir vertical well productivity formula as a basic formula and assuming that the stratum is horizontal, homogeneous and equal-thickness, the boundary is constant-pressure and the seepage is single-phase stable according to the seepage characteristics of the low-permeability oil reservoir:
wherein Q is the mean value of the straight well productivity of the equal-thickness stratum, mu0Is crude oil viscosity, h is oil layer thickness, K is oil layer absolute permeability, GrTo initiate the pressure gradient, reTo supply the oil of radius, rwIs the borehole radius, PeTo supply pressure, PwfIs the bottom hole pressure of the production well.
Compared with a straight well, a large-inclination directional well drills through a longer oil layer well section in the stratum, and the oil layer thickness parameter is equivalent to the length of an inclined well in a production interval. At the same time, the deviation of the well can generate a pseudo-skin factor SpTrue skin factor S due to reservoir damagetAnd then deducing a production energy formula of the large-inclination directional well:
wherein,wherein Q is the predicted productivity of the oil well, mu0Is the viscosity of the crude oil, hsLength of highly deviated well in producing interval, K is absolute permeability of reservoir, GrTo initiate the pressure gradient, reTo supply the oil of radius, rwIs the borehole radius, SpPseudoepidermal factor, S, generated for well deviationtTrue skin factor, P, for reservoir damageeTo supply pressure, PwfIs the bottom hole pressure of the production well.
The starting pressure gradient data needs to be measured through experiments, but for most low-permeability reservoir blocks, the work load is large when the experiment is carried out on each block to measure the starting pressure gradient, and the coring data are not complete when part of the blocks are implemented early. Therefore, the starting pressure gradient of the invention is calculated by a regression method, that is, actual block data of the over-starting pressure gradient is tested by adopting a low permeability reservoir experiment, for example, a starting pressure gradient and fluidity relation curve diagram provided by the embodiment of the invention shown in fig. 1 is regressed according to experimental data to obtain a starting pressure gradient regression formula:
Gr=0.491×(K/μ0)-0.5423formula ③
Wherein K is the absolute permeability of the oil layer, mu0The equation ③ is the starting pressure gradient and mobility (effective reservoir permeability K and crude oil viscosity μ) from the test0Quotient of (d) that is, knowing the permeability of the reservoir rock and the viscosity of the crude oil, the starting pressure gradient of the reservoir rock can be found by this formula.
By substituting the startup pressure gradient equation (equation ③) into the steep oriented well capacity equation (equation ②), the steep oriented well capacity equation can be derived:
a pseudo-skin factor S of the well deviationpCalculated according to the following formula:
true skin factor S of the reservoir damagetCalculated according to the following formula:
wherein theta is the well inclination angle, K is the absolute permeability of the oil layer, KdTo the absolute permeability of the reservoir in the damaged area, rdThe radius of the contamination zone.
Examples
G106 block supply pressure is 34MPa, bottom hole pressure is 20MPa, oil supply radius is 350m, contamination zone radius is 1m, well bore radius is 0.1m, and permeability of oil reservoir in undamaged area is 6 multiplied by 10-3um2The permeability of oil deposit in damaged area is 1.5X 10-3um2The dip angle of the stratum is 11.6 degrees, the viscosity of crude oil is 62.2mPa.S, the average inclination angle of the directional well with large inclination is 45 degrees, the length of the directional well with large inclination in the production interval is 48m, the yield of the directional well with large inclination is 17.12t/d according to a formula, the average yield of the directional well with large inclination in the initial period of actual drilling operation is 17.7t/d, and the predicted value and the actual value are better in accordance. The method for calculating the capacity of the low-permeability oil reservoir large-inclination directional well successfully realizes the capacity of a G106 block of the low-permeability oil reservoir of a large-port oil field, the capacity after production is better after the block is drilled by the large-inclination directional well, the daily oil production is average 17.7t/d in the initial stage of production, the capacity is calculated to be 17.12t/d by using a large-inclination directional well capacity formula, and the predicted value is better in accordance with the actual value.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.

Claims (6)

1. A method for calculating the capacity of a highly deviated well of a low-permeability reservoir is characterized by comprising the following steps:
acquiring basic parameters;
substituting the acquired basic parameters into the following formula to calculate the productivity of the highly deviated well of the low-permeability reservoir:
wherein Q is the predicted productivity of the highly deviated well, mu0Is the viscosity of the crude oil, hsLength of highly deviated well in producing interval, K is absolute permeability of reservoir, GrTo initiate the pressure gradient, reTo supply the oil of radius, rwIs the borehole radius, SpPseudoepidermal factor, S, generated for well deviationtTrue skin factor, P, for reservoir damageeTo supply pressure, PwfIs the bottom hole pressure of the production well.
2. The method of claim 1, wherein the start-up pressure gradient GrDetermining according to pre-stored low permeability reservoir test data and the following relational expression:
Gr=0.491×(K/μ0)-0.5423
wherein K is the absolute permeability of the oil layer, mu0Is the crude oil viscosity.
3. The method of claim 1, wherein the well deviation results in a pseudo-skin factor SpCalculated according to the following formula:
true skin factor S of the reservoir damagetCalculated according to the following formula:
wherein theta is the well inclination angle, K is the absolute permeability of the oil layer, KdTo the absolute permeability of the reservoir in the damaged area, rdThe radius of the contamination zone.
4. A low permeability reservoir highly deviated well productivity calculation device is characterized by comprising:
a data acquisition unit for acquiring basic parameters;
the controller is connected with the data acquisition unit and used for substituting the basic parameters acquired by the data acquisition unit into the following formula to calculate the low permeability reservoir highly deviated well productivity:
wherein Q is the predicted productivity of the highly deviated well, mu0Is the viscosity of the crude oil, hsLength of highly deviated well in producing interval, K is absolute permeability of reservoir, GrTo initiate the pressure gradient, reTo supply the oil of radius, rwIs the borehole radius, SpPseudoepidermal factor, S, generated for well deviationtTrue skin factor, P, for reservoir damageeTo supply pressure, PwfIs the bottom hole pressure of the production well.
5. The device of claim 4, wherein the activation pressure gradient GrDetermining according to pre-stored low permeability reservoir test data and the following relational expression:
Gr=0.491×(K/μ0)-0.5423
wherein K is the absolute permeability of the oil layer, mu0Is the crude oil viscosity.
6. The apparatus of claim 4, wherein the well deviation produces a pseudo-skin factor SpCalculated according to the following formula:
true skin factor S of the reservoir damagetCalculated according to the following formula:
wherein theta is the well inclination angle, K is the absolute permeability of the oil layer, KdTo the absolute permeability of the reservoir in the damaged area, rdThe radius of the contamination zone.
CN201910122327.9A 2019-02-19 2019-02-19 Low-permeability oil deposit high angle hole Productivity and device Pending CN109858174A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007204519A (en) * 2006-01-31 2007-08-16 Tosoh Corp Petroleum resin and its manufacturing method
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KR20160117044A (en) * 2015-03-31 2016-10-10 코오롱인더스트리 주식회사 Petroleum Resin and Method for Manufacturing Thereof
CN107965315A (en) * 2017-11-24 2018-04-27 中国石油大港油田勘探开发研究院 A kind of low-permeability oil deposit PRODUCTION FORECASTING METHODS

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007204519A (en) * 2006-01-31 2007-08-16 Tosoh Corp Petroleum resin and its manufacturing method
KR20160117044A (en) * 2015-03-31 2016-10-10 코오롱인더스트리 주식회사 Petroleum Resin and Method for Manufacturing Thereof
CN105069303A (en) * 2015-08-17 2015-11-18 中国海洋石油总公司 Quantitative evaluation method of low-permeability reservoir production capacity
CN107965315A (en) * 2017-11-24 2018-04-27 中国石油大港油田勘探开发研究院 A kind of low-permeability oil deposit PRODUCTION FORECASTING METHODS

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Effective date of registration: 20201127

Address after: 100000 Beijing city Dongcheng District No. 16 Andrew

Applicant after: PetroChina Company Limited

Address before: 300280 happy road, Dagang Oilfield, Tianjin Binhai New Area

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Application publication date: 20190607