CN110778306A - Method for correcting abnormity of gas well productivity equation - Google Patents

Method for correcting abnormity of gas well productivity equation Download PDF

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Publication number
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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China
Prior art keywords
test
equation
pressure
gas well
productivity
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雷霄
张风波
马帅
韩鑫
王雯娟
李树松
李伟
张骞
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Zhanjiang Branch
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China National Offshore Oil Corp CNOOC
CNOOC China Ltd Zhanjiang Branch
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/06—Measuring temperature or pressure
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/02—Agriculture; Fishing; Mining

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

Method for correcting abnormity of gas well productivity equation
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):
Figure BDA0002242195540000021
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:
Figure BDA0002242195540000022
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:
Figure BDA0002242195540000023
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:
Figure BDA0002242195540000024
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):
Figure BDA0002242195540000031
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:
Figure BDA0002242195540000032
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:
Figure BDA0002242195540000041
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):
Figure FDA0002242195530000011
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:
Figure FDA0002242195530000012
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:
Figure FDA0002242195530000021
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:
Figure FDA0002242195530000022
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Cited By (1)

* Cited by examiner, † Cited by third party
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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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
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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 predicting yield of gas well
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
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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Cited By (2)

* Cited by examiner, † Cited by third party
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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