A method for determining the number of gas production wells in gas storages considering the change of gas well productivity
A determination method and technology of gas storage, applied in data processing applications, instruments, calculations, etc., can solve the problems of not considering the change of the number of gas production wells and the inability to accurately calculate the number of gas production wells of the gas storage, so as to save investment, Avoid investment waste and calculate accurate results
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Embodiment 1
[0037] The present embodiment provides a method for determining the number of gas production wells in a gas storage that considers gas well productivity changes, including the following steps:
[0038] Step 1) According to the productivity well test data of the gas storage construction area, select two production data points, substitute them into the gas well productivity equation, and solve the gas well productivity equation coefficients a, b;
[0039] Step 2) According to the wellbore pipe flow equation and the gas production wellhead pressure, determine the bottom hole flow pressure of the gas well under different daily gas production rates;
[0040] Step 3) In the same coordinate system, draw different average formation pressures P according to the gas well productivity equation e Under the conditions, the daily gas production q and bottom hole flow pressure P of the gas production well wf At the same time, according to the wellbore tube flow equation, the daily gas produ...
Embodiment 2
[0050] On the basis of Embodiment 1, this embodiment provides a method for determining the number of gas production wells in a gas storage that considers changes in gas well productivity, including the following steps:
[0051] Step 1. According to the gas well production performance data and productivity well test data in the gas storage construction area, select two production data points, substitute them into the productivity equation, and solve the gas well productivity equation coefficients a and b after combining the equations; The monthly decline rate of production is less than 5%, and the monthly decline rate of bottom hole flow pressure is less than 3%;
[0052] First production data point: (P e1 , P wf1 , q 1 );
[0053] Second production data point: (P e2 , P wf2 , q 2 );
[0054] Capacity Equation:
[0055] Among them, P e1 is the average formation pressure of production data point 1, MPa; P wf1 is the bottom hole flow pressure of production data point ...
Embodiment 3
[0072] This embodiment further describes the present invention by determining the number of gas production wells in a gas storage. The determination steps are as follows:
[0073] Step 1. Use the well test data of a gas storage to obtain the gas well productivity equation:
[0074]
[0075] Step 2. Select the tubing size 3 1 / 2 in, wellhead pressure of 3MPa to determine the wellbore flow equation.
[0076] Step 3. Draw the intersection diagram of inflow and outflow curves according to the gas well productivity equation and flow equation (see figure 2 ), select 5 intersection points A(100, 19.2, 29), B(85, 16.5, 25), C(65, 12.8, 20), D(45, 9.4, 15), E(25, 6.1, 10 ), where point A means that when the average formation pressure is 29MPa, the bottom hole flow pressure of the gas well is 19.2MPa, and the reasonable daily gas production of the gas well is 100×10 4 m 3 / d, other junctions have the same meaning. According to the average formation pressure at the intersecti...
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