CN113550744B - Shale gas drainage gas production effect evaluation method - Google Patents
Shale gas drainage gas production effect evaluation method Download PDFInfo
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- CN113550744B CN113550744B CN202010337431.2A CN202010337431A CN113550744B CN 113550744 B CN113550744 B CN 113550744B CN 202010337431 A CN202010337431 A CN 202010337431A CN 113550744 B CN113550744 B CN 113550744B
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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
- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention discloses a shale gas drainage gas production effect evaluation method. The evaluation method comprises the following steps: s1, acquiring daily gas production before drainage and gas production measures and daily gas production after the measures; s2, calculating the daily rate of decline of the gas well during the measure according to the daily gas production before and after the measure obtained in the S1; s3, calculating daily yield increase gas according to daily yield decrease rate of each day and daily gas yield of the same day and daily gas yield of the previous day; s4, calculating the accumulated yield increase amount of the effective production days; s5, calculating the input-output ratio according to the accumulated yield increase amount to evaluate the shale gas drainage gas production effect. The shale gas drainage gas production effect evaluation method disclosed by the invention considers the characteristic of high shale gas well progressive rate. The drainage gas production is actually filled according to the day, so that the daily reduction rate is considered, the comparison of the output before and after measures can be met, and the evaluation result distortion caused by negative numbers is avoided.
Description
Technical Field
The invention relates to the field of gas production processes, in particular to a shale gas drainage gas production effect evaluation method.
Background
The influence of the accumulated liquid on the gas well is large, and in order to effectively drain the accumulated liquid at the bottom of the well, a drainage and gas production process is needed.
Different from the conventional oil gas well measure effect evaluation, the shale gas well progressive rate is higher, and the gas yield after the measure is required to consider the influence of the gas well progressive rate. If the conventional effect evaluation is adopted, the difference between the measured value and the measured value possibly has negative numbers, and some oil fields adopt the fact that the measured value is the yield increase, so that the measured value cannot be truly reflected.
Therefore, there is a need to develop an effective and objective evaluation method for the drainage and production effects of shale gas wells.
Disclosure of Invention
The invention aims at providing a shale gas drainage gas production effect evaluation method aiming at the characteristic of high shale gas well progressive rate.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a shale gas drainage gas production effect evaluation method, which comprises the following steps:
s1, acquiring daily gas production before drainage and gas production measures and daily gas production after the measures;
s2, calculating the daily rate of decline of the gas well during the measure according to the daily gas production before and after the measure obtained in the S1;
s3, calculating daily yield increase gas according to daily yield decrease rate of each day and daily gas yield of the same day and daily gas yield of the previous day;
s4, calculating the accumulated yield increase amount of the effective production days in the measure period;
s5, calculating the input-output ratio according to the accumulated yield increase amount to evaluate the shale gas drainage gas production effect.
In a preferred embodiment of the present invention, daily gas production is obtained in S1 on the first day before the drainage and gas production measures and on the second day before the previous measures.
Specifically, S1 comprises the steps of draining and producing gas for the shale gas well, and acquiring daily gas production before the draining and producing gas and daily gas production after the draining and producing gas. For example, foam drainage gas production is adopted in the drainage gas production measures of the shale gas well, namely foam drainage agent is filled into the gas production well; the plunger lifts, and the bottom-hole accumulated liquid is discharged through the reciprocating motion of the plunger.
Further, as understood by those skilled in the art, the term "measure" refers to the period of time during which the drainage and gas production measures are performed, and the daily gas production after the measures refers to the daily gas production during the whole measure. The effective production days refer to days when daily gas production is positive in the measure period; and judging that the daily gas production is positive in the measure period, and effectively judging that the measure of the current day is effective.
In a preferred embodiment of the present invention, the daily reduction rate in S2 is calculated by formula (1):
wherein alpha is n The daily rate of decrease for the nth day after the measure;
q ma(n-1) for daily gas production on day n-1 after the measure, m 3 ；
q ma(n-2) For daily gas production on the n-2 th day after the measure, m 3 。
And (3) quantifying the shale gas well decline rate in the formula (1) so as to realize the daily increase in yield after the follow-up calculation measure of eliminating the shale gas well decline rate influence.
Those skilled in the art understand that when n is 1, q ma(0) Mean daily gas production on the first day before measure, q ma(-1) Mean daily gas production the next day before the measure; and all the gas production amount can be obtained by checking the production daily report.
In a preferred embodiment of the present invention, the daily gain in S3 is the difference between the daily gain on the same day and the daily gain on the previous day measured by the rate of decrease.
In this preferred embodiment, it is further preferred that the daily gas production in S3 is calculated by formula (2):
Δq (n) ＝q ma(n) -q ma(n-1) ×(1-α n ) (2)
Wherein Δq (n) To increase the gas yield on the nth day after the measure, m 3 ；
q ma(n) For daily gas production on the nth day after the measure, m 3 ；
q ma(n-1) For daily gas production on day n-1 after the measure, m 3 The method comprises the steps of carrying out a first treatment on the surface of the Those skilled in the art understand that when n is 1, q ma(0) Daily gas production on the first day before the measure;
α n the daily decrease rate on the nth day after the measure.
The method has the advantages that the influence of the high progressive rate of the shale gas well on the drainage and gas production process effect is effectively avoided when the daily gas production increase after the measure is calculated in the formula (2), the added value of the total gas production before and after the drainage and gas production of the gas well can be truly reflected, and the quality of the measure effect can be more truly reflected.
And S4, the accumulated yield increase gas quantity is the sum of daily yield increase gas quantities corresponding to effective production days after the measures. The daily gas production increase in the application period is positive, namely the measure of the day is judged to be effective; and S4, the accumulated yield increase gas quantity is actually the sum of positive numbers of daily yield increase gas quantities after measures.
In a preferred embodiment of the present invention, the cumulative stimulation amount in S4 is calculated by the formula (3):
wherein DeltaN p To accumulate the yield increase gas quantity, m 3 ；
t is the number of days of measure validity.
The input-output ratio in S5 is the ratio of the net output of the project to the input of the project.
In a preferred embodiment of the present invention, the input-output ratio in S5 is calculated by the formula (4):
wherein lambda is input-output ratio;
p is the price of natural gas, yuan/m 3 ；
T is tax, element/m 3 ；
C cost for production, yuan/m 3 ；
I is the total cost of measures.
The above cost, price and other information can be obtained by the relevant departments. The tax includes city maintenance construction tax, education fee addition and resource tax; the production cost is the operation cost.
The invention provides a shale gas drainage gas production effect evaluation method, which comprises the following steps:
s1, acquiring daily gas production of a first day before drainage and gas production measures and a second day before the measures, and acquiring daily gas production after the measures;
s2, calculating daily rate of decline of the gas well during the measure according to the daily gas production before and after the measure obtained in the S1 through the formula (1);
s3, calculating daily gas production rate according to daily gas production rate of the day and day before according to the daily rate of decrease of the day by the formula (2);
Δq (n) ＝q ma(n) -q ma(n-1) ×(1-α n ) (2)
S4, calculating the accumulated yield increase amount of the effective production days in the measure period through the formula (3);
s5, calculating input-output ratio according to the accumulated yield increase amount through the method (4) so as to evaluate the drainage and gas production effects of shale gas;
in the above, alpha n The daily rate of decrease for the nth day after the measure;
q ma(n-1) for daily gas production on day n-1 after the measure, m 3 ；
q ma(n-2) For daily gas production on the n-2 th day after the measure, m 3 ；
Δq (n) To increase the gas yield on the nth day after the measure, m 3 ；
ΔN p To accumulate the yield increase gas quantity, m 3 ；
t is the number of days of the measure validity period;
lambda is input-output ratio;
p is the price of natural gas, yuan/m 3 ；
T is tax, element/m 3 ；
C, cost and price for production/m 3 ；
I is the total cost of measures.
The shale gas drainage gas production effect evaluation method disclosed by the invention considers the characteristic of high shale gas well progressive rate. The drainage gas production is actually filled according to the day, so that the daily reduction rate is considered, the comparison of the output before and after measures can be met, and the evaluation result distortion caused by negative numbers is avoided.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
The invention provides a preferred embodiment, wherein the shale gas drainage gas production effect evaluation method comprises the following steps:
s1, acquiring daily gas production of a first day before drainage and gas production measures and a second day before the measures, and acquiring daily gas production after the measures;
s2, calculating daily rate of decline of the gas well during the measure according to the daily gas production before and after the measure obtained in the S1 through the formula (1);
s3, calculating daily gas production rate according to daily gas production rate of the day and day before according to the daily rate of decrease of the day by the formula (2);
Δq (n) ＝q ma(n) -q ma(n-1) ×(1-α n ) (2)
S4, calculating the accumulated yield increase amount of the effective production days in the measure period through the formula (3);
s5, calculating input-output ratio according to the accumulated yield increase amount through the method (4) so as to evaluate the drainage and gas production effects of shale gas;
in the above, alpha n The daily rate of decrease for the nth day after the measure;
q ma(n-1) for daily gas production on day n-1 after the measure, m 3 ；
q ma(n-2) For daily gas production on the n-2 th day after the measure, m 3 ；
Δq (n) To increase the gas yield on the nth day after the measure, m 3 ；
ΔN p To accumulate the yield increase gas quantity, m 3 ；
t is the number of days of the measure validity period;
lambda is input-output ratio;
p is the price of natural gas, yuan/m 3 ；
T is tax, element/m 3 ；
C cost for production, yuan/m 3 ；
I is the total cost of measures.
According to the steps, the accumulated gas yield during the measure period of a shale gas well (444 days, 288 days of effective production) is calculated to be 834667m 3 The input-output ratio is calculated as 2.4046 according to 834667x 1.56/(834667x 0.17+900x 444), and the economic benefit is 2613.34 yuan. The effective rate of the measure is 64.86 percent (288/444x100%).
Wherein the data are shown in table 1 below; the formula of the daily reduction rate in the table is calculated asThe gas production rate is 0 in the day before the well is stopped due to other factors such as the stop of the compressor, and the like, and the direct taking and decreasing rate is 0.
The daily gain is calculated by: if the rate is reduced>0, then according to the formula Deltaq (n) ＝q ma(n) -q ma(n-1) ×(1-α n ) Calculating, otherwise, when the reduction rate is negative,since the previous day has no effect or some special cause causes the production of the gas well to be stopped, in order not to cause data distortion, the reduction rate is calculated as 0, namely as deltaq (n) ＝q ma(n) -q ma(n-1) And (5) calculating.
TABLE 1
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It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (3)
1. The shale gas drainage gas production effect evaluation method is characterized by comprising the following steps of:
s1, acquiring daily gas production of a first day before drainage and gas production measures and a second day before the measures, and acquiring daily gas production after the measures;
s2, calculating daily rate of decline of the gas well during the measure according to the daily gas production before and after the measure obtained in the S1 through the formula (1);
s3, calculating daily gas production rate according to daily gas production rate of the day and day before according to the daily rate of decrease of the day by the formula (2);
Δq (n) ＝q ma(n) -q ma(n-1) ×(1-α n ) (2)
S4, calculating the accumulated yield increase amount of the effective production days in the measure period through the formula (3);
s5, calculating input-output ratio according to the accumulated yield increase amount through the method (4) so as to evaluate the drainage and gas production effects of shale gas;
in the above, alpha n The daily rate of decrease for the nth day after the measure;
q ma(n-1) for daily gas production on day n-1 after the measure, m 3 ；
q ma(n-2) For daily gas production on the n-2 th day after the measure, m 3 ；
Δq (n) To increase the gas yield on the nth day after the measure, m 3 ；
ΔN p To accumulate the yield increase gas quantity, m 3 ；
t is the number of days of the measure validity period;
lambda is input-output ratio;
p is the price of natural gas, yuan/m 3 ；
T is tax, element/m 3 ；
C cost for production, yuan/m 3 ；
I is the total cost of measures.
2. The shale gas drainage and gas production effect evaluation method according to claim 1, wherein the daily gain gas production in S3 is the difference between the daily gain gas production on the same day and the daily gain gas production on the previous day calculated by the rate of decrease.
3. The shale gas drainage gas production effect evaluation method according to claim 1, wherein the input-output ratio in S5 is a ratio of project net output to project input.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106484933A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of method and system for determining shale gas well well control dynamic holdup |
| CN107237614A (en) * | 2017-08-04 | 2017-10-10 | 中国石油化工股份有限公司华北油气分公司 | A kind of method of aqueous tight gas reservoir gas well water pumping gas production |
| CN108694254A (en) * | 2017-04-06 | 2018-10-23 | 中国石油化工股份有限公司 | One kind selling of one's property transformation production gas well yield experience decline curve analysis method |
| CN108959679A (en) * | 2018-03-19 | 2018-12-07 | 中国石油天然气股份有限公司 | A kind of evaluation method and evaluating apparatus of shale gas well fracturing effect |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106484933A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of method and system for determining shale gas well well control dynamic holdup |
| CN108694254A (en) * | 2017-04-06 | 2018-10-23 | 中国石油化工股份有限公司 | One kind selling of one's property transformation production gas well yield experience decline curve analysis method |
| CN107237614A (en) * | 2017-08-04 | 2017-10-10 | 中国石油化工股份有限公司华北油气分公司 | A kind of method of aqueous tight gas reservoir gas well water pumping gas production |
| CN108959679A (en) * | 2018-03-19 | 2018-12-07 | 中国石油天然气股份有限公司 | A kind of evaluation method and evaluating apparatus of shale gas well fracturing effect |
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