A method for calculating layered formation pressure in multi-layer commingled gas wells based on fluid pressure test
A multi-layer commingled mining and formation pressure technology, which is applied in surveying, earthwork drilling, wellbore/well components, etc., can solve the problems of large manpower and material resources, large deviation of calculation results, etc., and achieve the effect of high accuracy
Active Publication Date: 2022-07-01
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is that it takes a lot of manpower and material resources to determine the formation pressure, and at the same time, gas wells need to be shut down, and the calculation results have large deviations
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Embodiment 1
[0099] There are 4 sublayers in the gas well. According to the logging interpretation, the medium depth, effective thickness, permeability, shale content and original gas saturation of the sublayer of the well can be obtained. According to the gas production profile test, the daily gas production and daily water production of the sublayer can be obtained. , the bottom hole flow pressure of the gas well test is 5.95MPa, and the flow pressure gradient is 0.2636MPa / 100m. The viscosity and deviation factor of natural gas under the bottom hole pressure of 5.95MPa are 0.013mPa.s and 0.921, respectively.
[0100] Table 1 Basic data of a natural gas well
[0101]
[0102] Step 1: Collect bottom-hole fluid pressure test data, sublayer physical properties and production data of gas wells, see columns 2 to 11 in Table 1;
[0103] Step 2: Calculate the bottom hole flow pressure corresponding to the gas outlet of the small layer according to the test value of the flow pressure and the ...
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The present invention provides a method for calculating the layered formation pressure of multi-layer commingled gas wells based on fluid pressure test, which does not require gas well shut-in and has less deviation of calculation results. Bottom flow pressure test data, sublayer physical properties and sublayer production data; Step 2: Calculate the bottom hole flow pressure corresponding to the gas outlet of the sublayer according to the flow pressure and flow pressure gradient test values; Step 3: According to the original water saturation of the gas well sublayer Calculate the current water saturation of the sublayer according to the current gas production rate and the current gas production and water production; the fourth step: According to the relative permeability experimental data of the cores with different shale contents, regress to determine the relative permeability curve equation of the cores with different shale contents; the fifth step : Calculate the relative permeability of the gas phase in the small layer according to the shale content matching the phase permeability curve equation; Step 6: Calculate the formation pressure of the small layer according to the gas well productivity equation. The invention combines the test with the gas well seepage theory, and the calculated formation pressure of the small layer has high accuracy.
Description
technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a method for calculating the layered formation pressure of a multi-layer commingled gas well based on a fluid pressure test. Background technique [0002] Multi-layer commingled production of gas wells refers to perforating multiple sand layers at the same time in the vertical direction, allowing gas from different sand layers to flow into the bottom of the well at the same time. It is widely used. In order to know the reserve production of a small layer, reservoir engineers need to know the formation pressure of a small layer in time and accurately. Due to the large differences in physical properties (including thickness, porosity, shale content, permeability, etc.) of multiple small layers shot at the same time in the formation, and the strong interlayer heterogeneity, it is very difficult to accurately determine the formation pressure of the small layers in the...
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IPC IPC(8): E21B47/06
CPCE21B47/06
Inventor 庞进欧霖马誉畅刘洪卢灿洋张旭卢宇
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY