CN113550744A - Shale gas drainage and gas recovery effect evaluation method - Google Patents

Shale gas drainage and gas recovery effect evaluation method Download PDF

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CN113550744A
CN113550744A CN202010337431.2A CN202010337431A CN113550744A CN 113550744 A CN113550744 A CN 113550744A CN 202010337431 A CN202010337431 A CN 202010337431A CN 113550744 A CN113550744 A CN 113550744A
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蔡龙浩
李学良
方梁锋
袁博
李博
李昕宇
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何远哲
仲超
朱涛
陈瑶
蒋沅兵
刘锦
刘佩衡
孟丹
哈长鸣
朱斌
赵剑飞
谢昕
姜家悦
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Abstract

The invention discloses a shale gas drainage and gas recovery effect evaluation method. The evaluation method comprises the following steps: s1, acquiring the daily gas production amount before the drainage gas production measure and the daily gas production amount after the measure; s2, calculating daily decrement rate of the gas well during the measure period according to the daily gas production before and after the measure obtained in S1; s3, calculating daily gas production increase according to daily decrement rate, daily gas production on the same day and daily gas production on the previous day; s4, calculating the accumulated yield increasing air quantity of the effective production days; and S5, calculating the input-output ratio according to the accumulated yield gas production amount to evaluate the shale gas drainage gas production effect. The shale gas drainage and gas recovery effect evaluation method provided by the invention considers the characteristic of high shale gas well decrement rate. The drainage gas production is actually in a daily filling mode, so that the daily decrement rate is considered, the comparison of the yield before and after the measures can be met, and the evaluation result is not distorted due to the occurrence of negative numbers.

Description

Shale gas drainage and gas recovery effect evaluation method
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 accumulated liquid has a great influence on a gas well, and a drainage gas production process is needed to effectively discharge the accumulated liquid at the bottom of the well.
Different from the evaluation of the effect of the conventional oil and gas well measures, the gas yield after the measures needs to consider the decreasing influence of the gas well because the shale gas well has higher decreasing rate. If the conventional effect evaluation is adopted, negative numbers are likely to appear between the difference after the measures and before the measures, and the gas yield after the measures adopted by some oil fields is the yield increasing gas yield, so that the effect of the measures cannot be truly reflected.
Therefore, there is a need for developing an effective and objective evaluation method for the drainage and gas production effects of shale gas wells.
Disclosure of Invention
The invention aims to provide a shale gas drainage gas production effect evaluation method aiming at the characteristic of high shale gas well decrement rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an evaluation method for shale gas drainage gas recovery effect, which comprises the following steps:
s1, acquiring the daily gas production amount before the drainage gas production measure and the daily gas production amount after the measure;
s2, calculating daily decrement rate of the gas well during the measure period according to the daily gas production before and after the measure obtained in S1;
s3, calculating daily gas production increase according to daily decrement rate, daily gas production on the same day and daily gas production on the previous day;
s4, calculating the accumulated yield increase air quantity of the effective production days during the measure period;
and S5, calculating the input-output ratio according to the accumulated yield gas production amount to evaluate the shale gas drainage gas production effect.
In a preferred embodiment of the present invention, the daily gas production on the first day before the drainage gas production measure and the second day before the previous measure are acquired in S1.
Specifically, S1 includes performing water drainage gas production measures on the shale gas well, and acquiring the daily gas production before the water drainage gas production measures and the daily gas production after the measures. For example, foam drainage gas production is adopted in the drainage gas production measure of the shale gas well, namely, foam drainage agent is injected into the gas production well; and lifting the plunger, and discharging accumulated liquid at the bottom of the well through reciprocating motion of the plunger.
In addition, as understood by those skilled in the art, the term of the measure refers to the period of performing the drainage gas production measure, and the daily gas production amount after the measure refers to the daily gas production amount during the whole measure. The effective production days refer to days during which the daily gas production increase is positive; and judging that the daily measures are effective if the daily gas production increase is positive during the measures.
In a preferred embodiment of the present invention, the daily decrement rate in S2 is calculated by the formula (1):
Figure BDA0002467238100000021
wherein alpha isnThe daily decrement rate on the nth day after the measure;
qma(n-1)daily gas production m of day n-1 after the measures3；
qma(n-2)Daily gas production m of day n-2 after the measures3。
The shale gas well decrement rate is quantified in the formula (1), so that the yield is increased in the future after calculation measures are eliminated due to the shale gas well decrement rate.
As understood by those skilled in the art, when n is 1, q isma(0)The daily gas production q of the first day before the measurema(-1)Means the daily gas production on the second day before the measure; and all gas production rate can be obtained by checking production daily reports.
In a preferred embodiment of the present invention, the daily gas production increase in S3 is the difference between the daily gas production of the current day and the daily gas production of the previous day measured by the decreasing rate.
In this preferred embodiment, it is further preferred that the daily gas production increase in S3 is calculated by formula (2):
Δq(n)＝qma(n)-qma(n-1)×(1-αn) Formula (2)
Wherein, Δ q(n)For the daily increase in gas production on the nth day after the measure, m3；
qma(n)Daily gas production m on the n-th day after the measure3；
qma(n-1)Daily gas production m of day n-1 after the measures3(ii) a As understood by those skilled in the art, when n is 1, q isma(0)The daily gas production on the first day before the measure;
αnthe daily rate of decline on day n after the measure.
The influence of the high decreasing rate of the shale gas well on the effect of the drainage gas production process is effectively avoided when the gas production is increased in the future after the calculation measure of the formula (2), the increase value of the total gas production before and after the gas production by drainage is adopted by the gas well can be truly reflected, and the quality of the effect of the measure can be more truly reflected.
And the accumulated gas production increase amount in the S4 is the sum of the daily gas production increase amount corresponding to the effective production days after the measures. Judging that the measures on the day are effective when the daily gas production increase amount is positive during the application period; the cumulative stimulation gas yield in S4 is actually the sum of the daily increase gas yield after the measure as a positive number.
In a preferred embodiment of the present invention, the cumulative stimulation gas amount in S4 is calculated by equation (3):
Figure BDA0002467238100000031
wherein, Δ NpFor cumulative gas production increase m3；
t is the number of days of the effective period of the measures.
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 equation (4):
Figure BDA0002467238100000032
wherein, the lambda is the input-output ratio;
p is natural gas price, yuan/m3；
T is tax, Yuan/m3；
C is the cost of production, Yuan/m3；
I is the total cost of the measures.
The information of the cost, the price and the like can be obtained according to relevant departments. The tax fund comprises city maintenance construction tax, education fee addition and resource tax; the production cost expense is the operation cost.
One preferable scheme of the invention provides an evaluation method for shale gas drainage and gas recovery effects, which comprises the following steps:
s1, acquiring the daily gas production amount of the first day before the drainage gas production measure and the second day before the measure, and the daily gas production amount after the measure;
s2, calculating daily decrement rate of the gas well in the measure period according to the daily gas production before and after the measure obtained in S1 by the formula (1);
Figure BDA0002467238100000033
s3, calculating the daily gas production increase according to the daily decrement rate, the daily gas production on the same day and the daily gas production on the previous day by the formula (2);
Δq(n)＝qma(n)-qma(n-1)×(1-αn) Formula (2)
S4, calculating the accumulated yield increase air quantity of the effective production days in the measure period by the formula (3);
Figure BDA0002467238100000034
s5, calculating an input-output ratio according to the accumulated yield increase gas quantity by the formula (4) to evaluate the shale gas drainage gas production effect;
Figure BDA0002467238100000041
in the above formula, αnThe daily decrement rate on the nth day after the measure;
qma(n-1)daily gas production m of day n-1 after the measures3；
qma(n-2)Daily gas production m of day n-2 after the measures3；
Δq(n)For the daily increase in gas production on the nth day after the measure, m3；
ΔNpFor cumulative gas production increase m3；
t is the number of days of the effective period of the measure;
lambda is the input-output ratio;
p is natural gas price, yuan/m3；
T is tax, Yuan/m3；
C is the cost of production, Yuan/m3；
I is the total cost of the measures.
The shale gas drainage and gas recovery effect evaluation method provided by the invention considers the characteristic of high shale gas well decrement rate. The drainage gas production is actually in a daily filling mode, so that the daily decrement rate is considered, the comparison of the yield before and after the measures can be met, and the evaluation result is not distorted due to the occurrence of negative numbers.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The invention provides a preferable embodiment, wherein the evaluation method for shale gas drainage gas recovery effect comprises the following steps:
s1, acquiring the daily gas production amount of the first day before the drainage gas production measure and the second day before the measure, and the daily gas production amount after the measure;
s2, calculating daily decrement rate of the gas well in the measure period according to the daily gas production before and after the measure obtained in S1 by the formula (1);
Figure BDA0002467238100000051
s3, calculating the daily gas production increase according to the daily decrement rate, the daily gas production on the same day and the daily gas production on the previous day by the formula (2);
Δq(n)＝qma(n)-qma(n-1)×(1-αn) Formula (2)
S4, calculating the accumulated yield increase air quantity of the effective production days in the measure period by the formula (3);
Figure BDA0002467238100000052
s5, calculating an input-output ratio according to the accumulated yield increase gas quantity by the formula (4) to evaluate the shale gas drainage gas production effect;
Figure BDA0002467238100000053
in the above formula, αnThe daily decrement rate on the nth day after the measure;
qma(n-1)daily gas production m of day n-1 after the measures3；
qma(n-2)Daily gas production m of day n-2 after the measures3；
Δq(n)For the daily increase in gas production on the nth day after the measure, m3；
ΔNpFor cumulative gas production increase m3；
t is the number of days of the effective period of the measure;
lambda is the input-output ratio;
p is natural gas price, yuan/m3；
T is tax, Yuan/m3；
C is the cost of production, Yuan/m3；
I is the total cost of the measures.
According to the steps, the accumulative gas yield of a certain shale gas well measure period (444 days and 288 days of effective production) is calculated to be 834667m3The input-output ratio is calculated as 2.4046 according to 834667x 1.56/(834667x 0.17+900x 444), and the economic benefit of the measure is 2613.34 yuan. The effective rate of the measures is 64.86% (288/444x 100%).
Wherein the data are shown in table 1 below; the formula for the daily decrement rate in the table is calculated as
Figure BDA0002467238100000054
The gas production rate is 0 one day before the well stops production due to other factors such as compressor stop and the like, and the direct decrement rate is 0.
The daily air increment is calculated as follows: if the rate of decrease is>0, then according to the formula Δ q(n)＝qma(n)-qma(n-1)×(1-αn) Otherwise, when the reduction rate is negative, the gas well is stopped due to no effect of the previous day of measures or some special reasons, and in order not to cause data distortion, the calculation is carried out according to the reduction rate of 0, namely according to delta q(n)＝qma(n)-qma(n-1)And (4) calculating.
TABLE 1
Figure BDA0002467238100000061
Figure BDA0002467238100000071
Figure BDA0002467238100000081
Figure BDA0002467238100000091
Figure BDA0002467238100000101
Figure BDA0002467238100000111
Figure BDA0002467238100000121
Figure BDA0002467238100000131
Figure BDA0002467238100000141
Figure BDA0002467238100000151
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims (10)

1. The evaluation method for the shale gas drainage and gas recovery effect is characterized by comprising the following steps:
s1, acquiring the daily gas production amount before the drainage gas production measure and the daily gas production amount after the measure;
s2, calculating daily decrement rate of the gas well during the measure period according to the daily gas production before and after the measure obtained in S1;
s3, calculating daily gas production increase according to daily decrement rate, daily gas production on the same day and daily gas production on the previous day;
s4, calculating the accumulated yield increase air quantity of the effective production days during the measure period;
and S5, calculating the input-output ratio according to the accumulated yield gas production amount to evaluate the shale gas drainage gas production effect.
2. The shale gas drainage gas recovery effect evaluation method according to claim 1, wherein the daily decrement rate in S2 is calculated by formula (1):
Figure FDA0002467238090000011
wherein alpha isnThe daily decrement rate on the nth day after the measure;
qma(n-1)daily gas production m of day n-1 after the measures3；
qma(n-2)Daily gas production m of day n-2 after the measures3。
3. The shale gas drainage gas production effect evaluation method according to claim 1 or 2, wherein the daily gas production increase in S3 is a difference between the daily gas production on the same day and the daily gas production on the previous day measured by the decrement rate.
4. The shale gas drainage gas production effect evaluation method according to claim 3, wherein the daily gas production increase in S3 is calculated by equation (2):
Δq(n)＝qma(n)-qma(n-1)×(1-αn) Formula (2)
Wherein, Δ q(n)For the daily increase in gas production on the nth day after the measure, m3；
qma(n)Daily gas production m on the n-th day after the measure3；
qma(n-1)Daily gas production m of day n-1 after the measures3；
αnOn the nth day after the measureThe daily rate of decline.
5. The shale gas drainage gas recovery effect evaluation method according to claim 1 or 2, wherein the cumulative stimulation gas amount in S4 is calculated by equation (3):
Figure FDA0002467238090000012
wherein, Δ NpFor cumulative gas production increase m3；
Δq(n)For the daily increase in gas production on the nth day after the measure, m3；
t is the number of days of the effective period of the measures.
6. The shale gas drainage gas recovery effect evaluation method according to claim 1, wherein the daily decrement rate in S2 is calculated by formula (1):
Figure FDA0002467238090000021
the daily gas production increase in S3 is calculated by equation (2):
Δq(n)＝qma(n)-qma(n-1)×(1-αn) Formula (2)
The cumulative stimulation gas amount in S4 is calculated by equation (3):
Figure FDA0002467238090000022
wherein alpha isnThe daily decrement rate on the nth day after the measure;
qma(n-1)daily gas production m of day n-1 after the measures3；
qma(n-2)Daily gas production m of day n-2 after the measures3；
Δq(n)For the daily increase in gas production on the nth day after the measure, m3；
ΔNpFor cumulative gas production increase m3；
t is the number of days of the effective period of the measures.
7. The method for evaluating the effect of shale gas drainage and gas recovery as claimed in claim 1, wherein the input-output ratio in S5 is a ratio of a net output of a project to an input of the project.
8. The shale gas drainage gas recovery effect evaluation method according to claim 6 or 7, wherein the input-output ratio in S5 is calculated by formula (4):
Figure FDA0002467238090000023
wherein, the lambda is the input-output ratio;
ΔNpfor cumulative gas production increase m3；
P is natural gas price, yuan/m3；
T is tax, Yuan/m3；
C is the cost of production, Yuan/m3；
I is the total cost of the measures.
9. The shale gas drainage gas recovery effect evaluation method according to claim 1, wherein the daily gas production on the first day before the drainage gas recovery measure and the second day before the measure are obtained in S1.
10. The shale gas drainage gas recovery effect evaluation method according to claim 1, characterized by comprising the steps of:
s1, acquiring the daily gas production amount of the first day before the drainage gas production measure and the second day before the measure, and the daily gas production amount after the measure;
s2, calculating daily decrement rate of the gas well in the measure period according to the daily gas production before and after the measure obtained in S1 by the formula (1);
Figure FDA0002467238090000031
s3, calculating the daily gas production increase according to the daily decrement rate, the daily gas production on the same day and the daily gas production on the previous day by the formula (2);
Δq(n)＝qma(n)-qma(n-1)×(1-αn) Formula (2)
S4, calculating the accumulated yield increase air quantity of the effective production days in the measure period by the formula (3);
Figure FDA0002467238090000032
s5, calculating an input-output ratio according to the accumulated yield increase gas quantity by the formula (4) to evaluate the shale gas drainage gas production effect;
Figure FDA0002467238090000033
in the above formula, αnThe daily decrement rate on the nth day after the measure;
qma(n-1)daily gas production m of day n-1 after the measures3；
qma(n-2)Daily gas production m of day n-2 after the measures3；
Δq(n)For the daily increase in gas production on the nth day after the measure, m3；
ΔNpFor cumulative gas production increase m3；
t is the number of days of the effective period of the measure;
lambda is the input-output ratio;
p is natural gas price, yuan/m3；
T is tax, Yuan/m3；
C is the cost of production, Yuan/m3；
I is the total cost of the measures.
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Citations (4)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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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