CN102720487B - A kind of acquisition gas reservoir formation pressure system and method thereof - Google Patents
A kind of acquisition gas reservoir formation pressure system and method thereof Download PDFInfo
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- CN102720487B CN102720487B CN201210226393.9A CN201210226393A CN102720487B CN 102720487 B CN102720487 B CN 102720487B CN 201210226393 A CN201210226393 A CN 201210226393A CN 102720487 B CN102720487 B CN 102720487B
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Abstract
The invention discloses a kind of system and the method thereof that obtain gas reservoir strata pressure, belong to gas field and obtain strata pressure technical field, first the method measures the gas-bearing formation degree of depth of gas well, secondly the well head pressure of described gas well is measured, then wellbore pressure gradient is calculated according to described well head pressure, last according to the described gas-bearing formation degree of depth, the strata pressure of gas well described in described well head pressure and described wellbore pressure gradient calculation, the present invention is by a large amount of gas well liquid loading material computation individual well pressure datas, thus obtain abundant strata pressure data, make up actual acquisition formation pressure data amount few, the shortcoming that process implementation is loaded down with trivial details, meet the needs of full gas field strata pressure evaluating data amount.Also the contradiction in gas field development between shut-in pressure survey and gas well liquid loading is solved.
Description
Technical field
The invention belongs to gas field and obtain strata pressure technical field, relate to a kind of system and the method thereof that obtain 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 (such as Sichuan, gas field, the Liaohe River etc.), and the method is under the condition of closing well, at the bottom of pressure gauge lower going-into-well, directly acquire gas well strata pressure.The acquisition methods shortcoming of this gas reservoir strata pressure is that one is affect gas well liquid loading; two is increase cost; so the current strata pressure of gas reservoir can not be obtained on a large scale; especially self-contained gas field; realize full gas reservoir shut-in pressure survey hardly may, even if local, carry out overall shut-in pressure survey work among a small circle and also affect gas well and normally produce and downstream air feed.
Known shut in build up well head pressure is calculated to the theoretical formula of bottom pressure:
γ in the method
g, T and Z be unknown quantity, not easily to determine, and along with the change P of H
ws, γ
g, T and Z also can change.Therefore, the acquisition of the part relevant parameter in theoretical formula and define certain difficulty, increase computational complexity, operability is subject to a definite limitation.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of system without the need to the acquisition gas reservoir strata pressure under closing well acquisition condition again and method thereof.
For solving the problems of the technologies described above, the invention provides a kind of system obtaining gas reservoir strata pressure, comprising and measure gas-bearing formation depth module, measuring well mouth pressure module, acquisition wellbore pressure gradient modules and obtain strata pressure module;
Described measurement gas-bearing formation depth module is for measuring the gas-bearing formation degree of depth of gas well in gas field;
Described measuring well mouth pressure module is for measuring the well head pressure of gas well described in described gas field;
Described acquisition wellbore pressure gradient modules is for obtaining the wellbore pressure gradient of gas well described in described gas field;
The strata pressure of described acquisition strata pressure module gas well according to the described gas-bearing formation degree of depth, described well head pressure and described wellbore pressure gradient calculation.
Further, a kind of method obtaining gas reservoir strata pressure, specifically comprises the steps:
A measures the gas-bearing formation degree of depth of gas well in gas field;
B measures the well head pressure of gas well described in described gas field;
C obtains the wellbore pressure gradient of gas well described in described gas field;
The strata pressure of D gas well according to the described gas-bearing formation degree of depth, described well head pressure and described wellbore pressure gradient calculation, the computation model of described strata pressure as the formula (1):
P
ws=P
ts+ D × H(1), wherein, P
wsfor the strata pressure of gas well, unit is MPa;
P
tsfor 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, described acquisition wellbore pressure gradient also comprises the steps:
A measures the well head pressure of sample gas well in described gas field;
B measures the wellbore pressure gradient of sample gas well described in described gas field;
C is according to the wellbore pressure gradient of the well head pressure of described sample gas well and described sample gas well, set up the wellbore pressure gradient calculation model of all gas wells in described gas field, calculate the wellbore pressure gradient of all gas wells in described gas field according to described wellbore pressure gradient calculation model.
Further, the wellbore pressure gradient calculation model of all gas wells in described gas field is as the formula (2):
D＝0.00007069P
ts+0.0001237
（2）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
tsfor the well head pressure of gas well, unit is MPa.
Further, the computation model of described calculating wellbore pressure gradient is as the formula (3):
D＝0.0000652P
ts+0.0002659
（3）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
tsfor the well head pressure of gas well, unit is MPa.
The system of acquisition gas reservoir strata pressure provided by the invention and method thereof, by a large amount of gas well liquid loading material computation individual well pressure datas, thus obtain abundant strata pressure data, make up the shortcoming that actual acquisition formation pressure data amount is few, process implementation is loaded down with trivial details, meet the needs of full gas field strata pressure evaluating data amount.Also the contradiction in gas field development between shut-in pressure survey and gas well liquid loading is solved.
Accompanying drawing explanation
The wellbore pressure gradient that Fig. 1 provides for the embodiment of the present invention and well head pressure relation curve;
The wellbore pressure gradient that Fig. 2 provides for the embodiment of the present invention and well head pressure relation curve;
The falloff curve of northern district, the gas field gas well of pacifying the border region that Fig. 3 provides for the embodiment of the present invention;
The falloff curve of south, the gas field gas well of pacifying the border region that Fig. 4 provides for the embodiment of the present invention.
Detailed description of the invention
A kind of system obtaining gas reservoir strata pressure that the embodiment of the present invention provides, comprises and measures gas-bearing formation depth module, measuring well mouth pressure module, acquisition wellbore pressure gradient modules and obtain strata pressure module;
Measure gas-bearing formation depth module for measuring the gas-bearing formation degree of depth of gas well in gas field;
Measuring well mouth pressure module is for measuring the well head pressure of gas well in gas field;
Obtain wellbore pressure gradient modules for obtaining the wellbore pressure gradient of gas well in gas field;
Obtain strata pressure module according to the strata pressure of the gas-bearing formation degree of depth, well head pressure and wellbore pressure gradient calculation gas well.
A kind of method obtaining gas reservoir strata pressure that the embodiment of the present invention also provides, specifically comprises the steps:
1, the gas-bearing formation degree of depth of gas well in gas field is measured;
2, the well head pressure of gas well in gas field is measured;
3, the wellbore pressure gradient of gas well in gas field is obtained;
4, the strata pressure of gas well according to the gas-bearing formation degree of depth, well head pressure and wellbore pressure gradient calculation, the computation model of described strata pressure as the formula (1):
P
ws＝P
ts+D×H
（1）
Wherein, P
wsfor the strata pressure of gas well, unit is MPa;
P
tsfor 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, the wellbore pressure gradient obtaining gas well can be directly measure the wellbore pressure gradient of this gas well, also can be completed by following steps:
The well head pressure of 31 these gas field sample gas wells of measurement;
The wellbore pressure gradient of 32 these gas field sample gas wells of measurement;
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, calculates the wellbore pressure gradient of all gas wells in gas field according to wellbore pressure gradient calculation model.
Utilize the relation (500 meters of measuring points) between the northern block gas well shut-in pressure survey static pressure gradient in gas field of pacifying the border region and well head pressure, establish the relation curve of closing well condition well-sinking barometric gradient and well head pressure, see Fig. 1.
Regression data point establishes the empirical formula of barometric gradient D and well head pressure Pts, utilizes this formula just can to determine to pacify the border region pressure gradient corresponding under the current well head pressure of the northern block gas well in gas field.
Wherein, the computation model of wellbore pressure gradient is calculated as the formula (2):
D＝0.00007069P
ts+0.0001237
（2）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
tsfor the well head pressure of gas well, unit is MPa.
Table 1 is pacified the border region gas field northern block individual well formation pressure calculation Comparative result table
Use the same method the relation set up and pacify the border region between gas field south block gas well shut-in pressure survey static pressure gradient and well head pressure, sees Fig. 2.
Regression data point establishes the empirical formula of barometric gradient D and well head pressure Pts, utilizes this formula just can to determine to pacify the border region pressure gradient corresponding under the current well head pressure of the northern block gas well in gas field.
Wherein, the computation model of wellbore pressure gradient is calculated as the formula (3):
D＝0.0000652P
ts+0.0002659
（3）
Wherein, D is the wellbore pressure gradient of gas well, and unit is MPa/100m;
P
tsfor the well head pressure of gas well, unit is MPa.
Table 2 is pacified the border region south, gas field block individual well formation pressure calculation Comparative result table
The data of these number pressure strong points and corresponding cumulative gas thereof is utilized to establish the falloff curve of gas well, respectively see Fig. 3 and Fig. 4, wherein, Fig. 3 is the falloff curve figure in northern district, gas field of pacifying the border region, Fig. 4 is the falloff curve figure of south, gas field, limit, as can be seen from Fig. 3 and Fig. 4, the pressure of conversion almost overlaps completely with falloff curve, and the bottom pressure of visible empirical formula method conversion still more accurately.After establishing the stable individual well falloff curve card of gas well, utilize this falloff curve, evaluate the strata pressure under any cumulative production of gas well.
The present invention breaks the method-closing well method of acquiring of traditional acquisition gas reservoir strata pressure, farthest solve the contradiction between gas well liquid loading and dynamic monitoring, make on the basis ensureing gas well continous-stable, still can effectively obtain gas reservoir strata pressure by mathematical computations, and result is more reliable.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. one kind obtains the method for gas reservoir strata pressure;
It is characterized in that, specifically comprise the steps:
A measures the gas-bearing formation degree of depth of gas well in gas field;
B measures the well head pressure of gas well described in described gas field;
C obtains the wellbore pressure gradient of gas well described in described gas field;
The strata pressure of D gas well according to the described gas-bearing formation degree of depth, described well head pressure and described wellbore pressure gradient calculation, the computation model of described strata pressure is such as formula shown in (1):
P
ws=P
ts+ D × H (1), wherein, P
wsfor the strata pressure of gas well, unit is MPa;
P
tsfor 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;
Described acquisition wellbore pressure gradient also comprises the steps:
A measures the well head pressure of sample gas well in described gas field;
B measures the wellbore pressure gradient of sample gas well described in described gas field;
C is according to the wellbore pressure gradient of the well head pressure of described sample gas well and described sample gas well, set up the wellbore pressure gradient calculation model of all gas wells in described gas field, calculate the wellbore pressure gradient of all gas wells in described gas field according to described wellbore pressure gradient calculation model.
2. method according to claim 1, is characterized in that, the wellbore pressure gradient calculation model of all gas wells in described gas field is such 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
tsfor the well head pressure of gas well, unit is MPa.
3. method according to claim 1, is characterized in that, the computation model of described calculating wellbore pressure gradient is such 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
tsfor the well head pressure of gas well, unit is MPa.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN104141490B (en) * | 2014-07-17 | 2016-08-31 | 中国石油天然气股份有限公司 | There are the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation and gas well production yield control method and device |
| CN104500030A (en) * | 2014-11-21 | 2015-04-08 | 中国石油天然气股份有限公司 | Ultra-high pressure gas reservoir production dynamic abnormal data diagnosis and correction method |
| 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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| CN101512100A (en) * | 2006-08-07 | 2009-08-19 | 普拉德研究及开发股份有限公司 | Method and system for pore pressure prediction |
| CN101560879A (en) * | 2008-04-15 | 2009-10-21 | 中国石油大学(北京) | Well test analysis control method for low permeability gas reservoir and method thereof |
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| CN1648410A (en) * | 2004-01-30 | 2005-08-03 | 施卢默格海外有限公司 | Method for determining pressure of earth formations |
| CN101512100A (en) * | 2006-08-07 | 2009-08-19 | 普拉德研究及开发股份有限公司 | Method and system for pore pressure prediction |
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