CN102720487A - System and method for acquiring formation pressure of gas reservoir - Google Patents
System and method for acquiring formation pressure of gas reservoir Download PDFInfo
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Abstract
The invention discloses a system and a method for acquiring formation pressure of a gas reservoir, belonging to the technical field of acquiring formation pressure of a gas field. And the contradiction between well closing pressure measurement and gas well production in gas field development is also solved.
Description
Technical field
The invention belongs to the gas field and obtain the strata pressure technical field, relate to a kind of system and method thereof of obtaining the gas reservoir strata pressure.
Background technology
At present, in gas field development, obtaining the most reliable way of gas reservoir strata pressure is exactly full gas reservoir shut-in pressure survey (for example Sichuan, gas field, the Liaohe River etc.), and this method is under the condition of closing well, at the bottom of the pressure gauge lower going-into-well, directly acquires the gas well strata pressure.The acquisition methods shortcoming of this gas reservoir strata pressure is that one is to influence gas well production; The 2nd, increase cost; So can not obtain the present strata pressure of gas reservoir on a large scale; Especially self-contained gas field, realize full gas reservoir shut-in pressure survey hardly maybe, even local, carry out whole shut-in pressure survey work among a small circle and also influence gas well ordinary production and downstream air feed.
Calculate the theoretical formula of bottom pressure for known shut in to build up well head pressure:
γ in this method
g, T and Z be unknown quantity, be difficult for confirming, and along with the variation P of H
Ws, γ
g, T and Z also can change.Therefore, the part correlation parameter in the theoretical formula obtain and define certain degree of difficulty, increase computational complexity, operability receives certain limitation.
Summary of the invention
Technical problem to be solved by this invention provides a kind of closing well that need not again and obtains system that obtains the gas reservoir strata pressure and method thereof under the condition.
For solving the problems of the technologies described above, the invention provides a kind of system that obtains the gas reservoir strata pressure, comprise measurement of gas layer depth module, measuring well mouth pressure module, obtain the wellbore pressure gradient modules and obtain the strata pressure module;
Said measurement of gas layer depth module is used for the gas-bearing formation degree of depth of measurement of gas Tanaka gas well;
Said measuring well mouth pressure module is used to measure the well head pressure of gas well described in the said gas field;
Saidly obtain the wellbore pressure gradient that the wellbore pressure gradient modules is used to obtain gas well described in the said gas field;
The said strata pressure that obtains the strata pressure module according to the said gas-bearing formation degree of depth, said well head pressure and the said gas well of said wellbore pressure gradient calculation.
Further, a kind of method of obtaining the gas reservoir strata pressure specifically comprises the steps:
The gas-bearing formation degree of depth of A measurement of gas Tanaka gas well;
B measures the well head pressure of gas well described in the said gas field;
C obtains the wellbore pressure gradient of gas well described in the said gas field;
D is according to the strata pressure of the said gas-bearing formation degree of depth, said well head pressure and the said gas well of said wellbore pressure gradient calculation, and the computation model of said strata pressure is suc as formula shown in (1):
P
Ws=P
Ts+ D * H (1), wherein, P
WsBe the strata pressure of gas well, unit is MPa;
P
TsBe the well head pressure of gas well, unit is MPa;
D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
H is the gas-bearing formation degree of depth of gas well, and unit is m.
Further, the said wellbore pressure gradient of obtaining also comprises the steps:
A measures the well head pressure of sample gas well in the said gas field;
B measures the wellbore pressure gradient of sample gas well described in the said gas field;
C is according to the well head pressure of said sample gas well and the wellbore pressure gradient of said sample gas well; Set up the wellbore pressure gradient calculation model of all gas wells in said gas field, draw the wellbore pressure gradient of all gas wells in said gas field according to said wellbore pressure gradient calculation Model Calculation.
Further, the wellbore pressure gradient calculation model of all gas wells in said gas field is suc as formula shown in (2):
D＝0.00007069P
ts+0.0001237
（2）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
TsBe the well head pressure of gas well, unit is MPa.
Further, the computation model of said calculating wellbore pressure gradient is suc as formula shown in (3):
D＝0.0000652P
ts+0.0002659
（3）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
TsBe the well head pressure of gas well, unit is MPa.
System and the method thereof of obtaining the gas reservoir strata pressure provided by the invention; Calculate the individual well pressure data through a large amount of gas well means of production; Thereby obtain abundant strata pressure data; Remedy the actual shortcoming that the formation pressure data amount is few, the process realization is loaded down with trivial details of obtaining, satisfy the needs of full gas field strata pressure evaluating data amount.Also solved the contradiction between shut-in pressure survey and gas well are produced in the gas field development.
Description of drawings
Wellbore pressure gradient and well head pressure relation curve that Fig. 1 provides for the embodiment of the invention;
Wellbore pressure gradient and well head pressure relation curve that Fig. 2 provides for the embodiment of the invention;
The northern falloff curve of distinguishing gas well in the gas field of pacifying the border region that Fig. 3 provides for the embodiment of the invention;
The falloff curve of gas well is distinguished in the south, gas field of pacifying the border region that Fig. 4 provides for the embodiment of the invention.
The specific embodiment
A kind of system that obtains the gas reservoir strata pressure that the embodiment of the invention provides comprises measurement of gas layer depth module, measuring well mouth pressure module, obtains the wellbore pressure gradient modules and obtains the strata pressure module;
Measurement of gas layer depth module is used for the gas-bearing formation degree of depth of measurement of gas Tanaka gas well;
Measuring well mouth pressure module is used for the well head pressure of measurement of gas Tanaka gas well;
Obtain the wellbore pressure gradient that the wellbore pressure gradient modules is used for obtaining the gas field gas well;
Obtain the strata pressure of strata pressure module according to the gas-bearing formation degree of depth, well head pressure and wellbore pressure gradient calculation gas well.
A kind of method of obtaining the gas reservoir strata pressure that the embodiment of the invention also provides specifically comprises the steps:
1, the gas-bearing formation degree of depth of measurement of gas Tanaka gas well;
2, the well head pressure of measurement of gas Tanaka gas well;
3, obtain the wellbore pressure gradient of gas well in the gas field;
4, according to the strata pressure of the gas-bearing formation degree of depth, well head pressure and the said gas well of wellbore pressure gradient calculation, the computation model of said strata pressure is suc as formula shown in (1):
P
ws＝P
ts+D×H
（1）
Wherein, P
WsBe the strata pressure of gas well, unit is MPa;
P
TsBe the well head pressure of gas well, unit is MPa;
D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
H is the gas-bearing formation degree of depth of gas well, and unit is m.
Wherein, in embodiments of the present invention, obtain the wellbore pressure gradient of gas well and can also can accomplish for directly measuring the wellbore pressure gradient of this gas well through following steps:
31 measure the well head pressure of this gas field sample gas well;
32 measure the wellbore pressure gradient of this gas field sample gas well;
33 according to the well head pressure of sample gas well and the wellbore pressure gradient of sample gas well, sets up the wellbore pressure gradient calculation model of all gas wells in gas field, draws the wellbore pressure gradient of all gas wells in gas field according to wellbore pressure gradient calculation Model Calculation.
The utilization relation (500 meters measuring points) between northern block gas well shut-in pressure survey static pressure gradient in gas field and the well head pressure of pacifying the border region has been set up the relation curve of closing well condition well-sinking barometric gradient and well head pressure, sees Fig. 1.
Regression data point has been set up the empirical formula of barometric gradient D and well head pressure Pts, utilizes this formula corresponding barometric gradient value under the present well head pressure of the northern block gas well in gas field of just can confirming to pacify the border region.
Wherein, the computation model of calculating wellbore pressure gradient is suc as formula shown in (2):
D＝0.00007069P
ts+0.0001237
（2）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
TsBe the well head pressure of gas well, unit is MPa.
The table 1 gas field northern block individual well formation pressure calculation contrast table as a result of pacifying the border region
Use the same method and set up the relation of pacifying the border region between gas field south block gas well shut-in pressure survey static pressure gradient and the well head pressure, see Fig. 2.
Regression data point has been set up the empirical formula of barometric gradient D and well head pressure Pts, utilizes this formula corresponding barometric gradient value under the present well head pressure of the northern block gas well in gas field of just can confirming to pacify the border region.
Wherein, the computation model of calculating wellbore pressure gradient is suc as formula shown in (3):
D＝0.0000652P
ts+0.0002659
（3）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
TsBe the well head pressure of gas well, unit is MPa.
The table 2 gas field south block individual well formation pressure calculation contrast table as a result of pacifying the border region
Utilize the data of these number pressure strong points and corresponding cumulative gas thereof to set up the falloff curve of gas well; Referring to Fig. 3 and Fig. 4, wherein, Fig. 3 is the northern falloff curve figure that distinguishes in gas field that pacifies the border region respectively; Fig. 4 is the falloff curve figure in south, gas field, limit district; Can find out that from Fig. 3 and Fig. 4 the pressure of conversion almost completely overlaps with falloff curve, the bottom pressure of visible empirical formula method conversion still more accurately.After having set up the stable individual well falloff curve card of gas well, utilize this falloff curve, estimate the strata pressure under any cumulative production of gas well.
The present invention has broken traditional method-closing well that obtains the gas reservoir strata pressure and has obtained method; Farthest solved the contradiction between gas well production and the dynamic monitoring; Make on the basis that guarantees the gas well continous-stable; Still can effectively obtain the gas reservoir strata pressure through mathematical computations, and the result is more reliable.
It should be noted last that; The above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to instance the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. a system that obtains the gas reservoir strata pressure is characterized in that, comprises measurement of gas layer depth module, measuring well mouth pressure module, obtains the wellbore pressure gradient modules and obtains the strata pressure module;
Said measurement of gas layer depth module is used for the gas-bearing formation degree of depth of measurement of gas Tanaka gas well;
Said measuring well mouth pressure module is used to measure the well head pressure of gas well described in the said gas field;
Saidly obtain the wellbore pressure gradient that the wellbore pressure gradient modules is used to obtain gas well described in the said gas field;
The said strata pressure that obtains the strata pressure module according to the said gas-bearing formation degree of depth, said well head pressure and the said gas well of said wellbore pressure gradient calculation.
2. a method of obtaining the gas reservoir strata pressure is characterized in that, specifically comprises the steps:
The gas-bearing formation degree of depth of A measurement of gas Tanaka gas well;
B measures the well head pressure of gas well described in the said gas field;
C obtains the wellbore pressure gradient of gas well described in the said gas field;
D is according to the strata pressure of the said gas-bearing formation degree of depth, said well head pressure and the said gas well of said wellbore pressure gradient calculation, and the computation model of said strata pressure is suc as formula shown in (1):
P
Ws=P
Ts+ D * H (1), wherein, P
WsBe the strata pressure of gas well, unit is MPa;
P
TsBe the well head pressure of gas well, unit is MPa;
D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
H is the gas-bearing formation degree of depth of gas well, and unit is m.
3. method according to claim 2 is characterized in that, the said wellbore pressure gradient of obtaining also comprises the steps:
A measures the well head pressure of sample gas well in the said gas field;
B measures the wellbore pressure gradient of sample gas well described in the said gas field;
C is according to the well head pressure of said sample gas well and the wellbore pressure gradient of said sample gas well; Set up the wellbore pressure gradient calculation model of all gas wells in said gas field, draw the wellbore pressure gradient of all gas wells in said gas field according to said wellbore pressure gradient calculation Model Calculation.
4. method according to claim 3 is characterized in that, the wellbore pressure gradient calculation model of all gas wells in said gas field is suc as formula shown in (2):
D＝0.00007069P
ts+0.0001237
（2）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
TsBe the well head pressure of gas well, unit is MPa.
5. method according to claim 3 is characterized in that, the computation model of said calculating wellbore pressure gradient is suc as formula shown in (3):
D＝0.0000652P
ts+0.0002659
（3）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
TsBe the well head pressure of gas well, unit is MPa.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244108A (en) * | 2013-06-05 | 2013-08-14 | 中国石油大学(华东) | Formation pressure determination method under condition of failure in wall shut-in during blowout |
| CN103912269A (en) * | 2014-03-28 | 2014-07-09 | 中石化江汉石油工程有限公司测录井公司 | Method for determining formation fracture pressure gradient logging of shale gas reservoir |
| CN104141490A (en) * | 2014-07-17 | 2014-11-12 | 中国石油天然气股份有限公司 | Method and device for judging water invasion condition of single well with water-gas reservoir and controlling gas well yield |
| CN104500030A (en) * | 2014-11-21 | 2015-04-08 | 中国石油天然气股份有限公司 | Ultrahigh pressure gas reservoir production dynamic abnormal data diagnosis and correction method |
| CN105464644A (en) * | 2015-11-16 | 2016-04-06 | 中国海洋石油总公司 | Wellhead pressure monitoring method and control system |
| CN114135276A (en) * | 2020-08-12 | 2022-03-04 | 中国石油天然气集团有限公司 | Method, device, processor and system for determining formation pressure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244108A (en) * | 2013-06-05 | 2013-08-14 | 中国石油大学(华东) | Formation pressure determination method under condition of failure in wall shut-in during blowout |
| CN103244108B (en) * | 2013-06-05 | 2014-06-25 | 中国石油大学(华东) | Formation pressure determination method under condition of failure in wall shut-in during blowout |
| CN103912269A (en) * | 2014-03-28 | 2014-07-09 | 中石化江汉石油工程有限公司测录井公司 | Method for determining formation fracture pressure gradient logging of shale gas reservoir |
| CN103912269B (en) * | 2014-03-28 | 2017-04-12 | 中石化江汉石油工程有限公司测录井公司 | Method for determining formation fracture pressure gradient logging of shale gas reservoir |
| CN104141490A (en) * | 2014-07-17 | 2014-11-12 | 中国石油天然气股份有限公司 | Method and device for judging water invasion condition of single well with water-gas reservoir and controlling gas well yield |
| CN104141490B (en) * | 2014-07-17 | 2016-08-31 | 中国石油天然气股份有限公司 | Method and device for judging water invasion condition of single well with water-gas reservoir and controlling gas well yield |
| CN104500030A (en) * | 2014-11-21 | 2015-04-08 | 中国石油天然气股份有限公司 | Ultrahigh pressure gas reservoir production dynamic abnormal data diagnosis and correction method |
| CN105464644A (en) * | 2015-11-16 | 2016-04-06 | 中国海洋石油总公司 | Wellhead pressure monitoring method and control system |
| CN105464644B (en) * | 2015-11-16 | 2018-03-23 | 中国海洋石油总公司 | A kind of well head pressure monitoring method and control system |
| CN114135276A (en) * | 2020-08-12 | 2022-03-04 | 中国石油天然气集团有限公司 | Method, device, processor and system for determining formation pressure |
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