CN110778306A - Method for correcting abnormity of gas well productivity equation - Google Patents
Method for correcting abnormity of gas well productivity equation Download PDFInfo
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- CN110778306A CN110778306A CN201911003996.0A CN201911003996A CN110778306A CN 110778306 A CN110778306 A CN 110778306A CN 201911003996 A CN201911003996 A CN 201911003996A CN 110778306 A CN110778306 A CN 110778306A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 81
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims abstract description 14
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- 238000001514 detection method Methods 0.000 claims description 12
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
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- E21B47/00—Survey of boreholes or wells
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Abstract
The invention discloses a method for correcting abnormity of a gas well productivity equation, which comprises the following steps: acquiring gas well productivity test and pressure recovery well test interpretation data; step two, calculating the utilization geological reserve in the test range under each test working system according to the accumulated gas production under each test working system, and calculating the average formation pressure in the utilization range at the last stage of each test working system by combining a material balance equation; and step three, substituting the test yield, the bottom hole flowing pressure and the average formation pressure in the utilization range at the final stage of each test working system into a binomial productivity equation, and constructing a new productivity equation calculation model. The invention has the beneficial effects that: the method can eliminate the limitation of the existing capacity analysis method and provide reference for reasonable production allocation of the corresponding gas well.
Description
Technical Field
The invention relates to a method for correcting abnormity of a gas well productivity equation.
Background
The conventional gas well productivity analysis obtains coefficients of a binomial productivity equation by regression of bottom hole flow pressure obtained in a productivity test process, test yield and constant formation pressure data, so that the unimpeded flow of a gas well is calculated. The conventional analysis method ignores the tiny change of the formation pressure, causes the abnormal phenomenon that the binomial coefficient of the binomial productivity equation is negative, and violates the law of gas well productivity analysis, and the conventional one-point method productivity equation is mostly obtained by counting the productivity law of the gas well of the gas field, so that the method has great limitation when being applied to the productivity evaluation of the gas wells of other gas fields.
Disclosure of Invention
The invention aims to provide a method for correcting the abnormity of the gas well productivity equation, which can eliminate the limitation of the existing productivity analysis method and provide reference for reasonable production allocation of a corresponding gas well.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for correcting abnormity of a gas well productivity equation comprises the following steps:
the method comprises the following steps: the method comprises the steps of sorting test data of the gas well productivity test and result data of pressure recovery well test interpretation, wherein the result data comprises the test time t
iInternal gas wellTest yield q of
iBottom hole flowing pressure P
WfiTesting the initial formation pressure P of the gas well
iWell test permeability K, wherein test time t
iTest yield q
iAnd bottom hole flowing pressure P
WfiAt least more than three groups are obtained, and the detection radius R at the end of each test working system is calculated
e;
Step two: using the probing radius R under each test operating regime
eTo calculate the reserve G for detection
(t)Using the test yield q under each test regime
iTo calculate the accumulated gas production G
p(t)Using the accumulated gas production G
p(t)And a material balance equation to calculate the detection radius R under each test working system
eInner mean formation pressure P
R(t)Probing radius R under each test operating system
eInner mean formation pressure P
R(t)The calculation formula of (2):
step three: testing the yield q obtained in the step one
iAnd bottom hole flowing pressure P
WfiAverage formation pressure P obtained in the second step
R(t)Substituting the productivity equation into the quasi-pressure binomial equation, constructing a new calculation model of the productivity equation, and forming a linear equation set of the quasi-pressure binomial productivity equation:
solving the linear equation set to obtain the binomial coefficients A and B, and finally obtaining the quasi-pressure binomial productivity equation of the gas well as the following steps: psi (P)
r)-ψ(P
wf)=Aq+Bq
2。
Preferably, in the second step, the material balance equation is consistent with the conventional material balance, and the reserve for testing is adopted at the testing time t
iInner, the detection radius R at the end of each test working system
eInternal reserve G
(t)To draw on the reserve G
(t)The calculation formula of (2) is as follows:
the accumulated gas production G at the final stage of each test working system in the test process is adopted to test the accumulated yield
p(t)Cumulative gas production G
p(t)The calculation formula of (2) is as follows:
the invention has the beneficial effects that: production practices prove that the method can be used for correcting the abnormal phenomenon that the slope is negative in the gas well binomial productivity equation, the accuracy of conventional gas well productivity analysis is obviously improved, the productivity of the low-permeability gas well can be analyzed, the universality is higher, and the method is more accurate and rapid for correcting the abnormal phenomenon of the binomial productivity equation of the gas well.
Drawings
FIG. 1 is a flow chart of a method for correcting an anomaly in a gas well productivity equation according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in fig. 1, a method for correcting an anomaly of a gas well productivity equation includes the following steps:
the method comprises the following steps: the method comprises the steps of sorting test data of the gas well productivity test and result data of pressure recovery well test interpretation, wherein the result data comprises the test time t
iTest yield q of inner gas well
iBottom hole flowing pressure P
WfiTesting the initial formation pressure P of the gas well
iWell test permeability K, wherein test time t
iTest yield q
iAnd bottom hole flowing pressure P
WfiAt least more than three groups are obtained, and the detection radius R at the end of each test working system is calculated
e;
Step two: using the probing radius R under each test operating regime
eTo calculate the reserve G for detection
(t)Using the test yield q under each test regime
iTo calculate the accumulated gas production G
p(t)Using the accumulated gas production G
p(t)And a material balance equation to calculate the detection radius R under each test working system
eInner mean formation pressure P
R(t)Probing radius R under each test operating system
eInner mean formation pressure P
R(t)The calculation formula of (2):
step three: testing the yield q obtained in the step one
iAnd bottom hole flowing pressure P
WfiAverage formation pressure P obtained in the second step
R(t)Substituting the productivity equation into the quasi-pressure binomial equation, constructing a new calculation model of the productivity equation, and forming a linear equation set of the quasi-pressure binomial productivity equation:
solving the linear equation set to obtain the binomial coefficients A and B, and finally obtaining the quasi-pressure binomial productivity equation of the gas well as the following steps: psi (P)
r)-ψ(P
wf)=Aq+Bq
2。
In the second step, the material balance equation is consistent with the conventional material balance, and the reserve for testing is adopted at the testing time t
iInner, the detection radius R at the end of each test working system
eInternal reserve G
(t)To draw on the reserve G
(t)The calculation formula of (2) is as follows:
the accumulated gas production G at the final stage of each test working system in the test process is adopted to test the accumulated yield
p(t)Cumulative gas production G
p(t)The calculation formula of (2) is as follows:
the method is based on the pressure propagation rule and the material balance in the gas well testing process, the change relation of the gas reservoir stratum pressure along with the testing time and the output is constructed, the stratum pressures under different testing working systems are calculated, on the basis of the traditional binomial productivity equation, the average stratum pressure in the movement range calculated by each testing working system replaces the original stratum pressure, a calculation model of the gas well productivity is created, errors caused by simplifying and processing the stratum pressure by the traditional method are reduced, the tiny stratum pressure fluctuation caused by the gas output in the testing process can be considered, the average stratum pressure in the movement range under each testing working system replaces the original stratum pressure, the abnormal phenomenon that the slope is negative in the conventional binomial productivity analysis is eliminated, and the analysis accuracy is further improved.
Claims (2)
1. A method for correcting abnormity of a gas well productivity equation is characterized by comprising the following steps:
the method comprises the following steps: the method comprises the steps of sorting test data of the gas well productivity test and result data of pressure recovery well test interpretation, wherein the result data comprises the test time t
iTest yield q of inner gas well
iBottom hole flowing pressure P
WfiTesting the initial formation pressure P of the gas well
iWell test permeability K, wherein test time t
iTest yield q
iAnd bottom hole flowing pressure P
WfiMore than three groups are obtained, and the detection radius R at the end of each test working system is calculated
e;
Step two: using the probing radius R under each test operating regime
eTo calculate the reserve G for detection
(t)Using the test yield q under each test regime
iTo calculate the accumulated gas production G
p(t)Using the accumulated gas production G
p(t)And a material balance equation to calculate the detection radius R under each test working system
eInner mean formation pressure P
R(t)Probing radius R under each test operating system
eInner mean formation pressure P
R(t)The calculation formula of (2):
step three: testing the yield q obtained in the step one
iAnd bottom hole flowing pressure P
WfiAverage formation pressure P obtained in the second step
R(t)Substituting the productivity equation into the quasi-pressure binomial equation, constructing a new calculation model of the productivity equation, and forming a linear equation set of the quasi-pressure binomial productivity equation:
solving the linear equation set to obtain the binomial coefficients A and B, and finally obtaining the quasi-pressure binomial productivity equation of the gas well as the following steps: psi (P)
r)-ψ(P
wf)=Aq+Bq
2。
2. The method for correcting the abnormality of the gas well productivity equation as claimed in claim 1, wherein in the second step, the material balance equation is consistent with the conventional material balance, and the reserve for testing is used at the testing time t
iInner, the detection radius R at the end of each test working system
eInternal reserve G
(t)To draw on the reserve G
(t)The calculation formula of (2) is as follows:
the accumulated gas production G at the final stage of each test working system in the test process is adopted to test the accumulated yield
p(t)Cumulative gas production G
p(t)The calculation formula of (2) is as follows:
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115977586A (en) * | 2023-01-10 | 2023-04-18 | 西南石油大学 | Novel method for evaluating productivity of offshore gas well |
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CA2231947A1 (en) * | 1998-03-12 | 1999-09-12 | Lloyd G. Alexander | Method of determining fluid inflow rates |
CN104832156A (en) * | 2015-05-05 | 2015-08-12 | 中国石油天然气股份有限公司 | Method for estimating gas well yield |
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CN106481332A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Method for determining area's dynamic holdup inside and outside shale gas multistage pressure break horizontal well |
CN106869918A (en) * | 2017-04-27 | 2017-06-20 | 中国海洋石油总公司 | Offshore field productivity test method of real-time adjustment |
CN108612525A (en) * | 2018-04-19 | 2018-10-02 | 重庆科技学院 | A kind of gas reservoir protection Reserve Estimation Method |
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2019
- 2019-10-22 CN CN201911003996.0A patent/CN110778306A/en active Pending
Patent Citations (6)
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CA2231947A1 (en) * | 1998-03-12 | 1999-09-12 | Lloyd G. Alexander | Method of determining fluid inflow rates |
CN104832156A (en) * | 2015-05-05 | 2015-08-12 | 中国石油天然气股份有限公司 | Method for estimating gas well yield |
CN106481332A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Method for determining area's dynamic holdup inside and outside shale gas multistage pressure break horizontal well |
CN105761160A (en) * | 2016-04-22 | 2016-07-13 | 中海石油(中国)有限公司湛江分公司 | Offshore oil and gas well test pipe column and ground flow decision system |
CN106869918A (en) * | 2017-04-27 | 2017-06-20 | 中国海洋石油总公司 | Offshore field productivity test method of real-time adjustment |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115977586A (en) * | 2023-01-10 | 2023-04-18 | 西南石油大学 | Novel method for evaluating productivity of offshore gas well |
CN115977586B (en) * | 2023-01-10 | 2023-10-20 | 西南石油大学 | Novel method for evaluating productivity of offshore gas well |
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