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

Active Publication Date: 2022-07-05
PETROCHINA CO LTD
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not consider the change in the number of gas production wells per day, and cannot accurately calculate the number of gas production wells required for the construction of the gas storage

Method used

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  • A method for determining the number of gas production wells in gas storages considering the change of gas well productivity
  • A method for determining the number of gas production wells in gas storages considering the change of gas well productivity
  • A method for determining the number of gas production wells in gas storages considering the change of gas well productivity

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Experimental program
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Effect test

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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Abstract

The invention provides a method for determining the number of gas production wells in a gas storage taking into account the change in the production capacity of gas wells. The functional relationship between the regression average formation pressure and the reasonable daily gas production volume of gas production wells is obtained by fitting the intersection point of the gas well production capacity equation and the wellbore pipe flow equation. As well as the fitting function relationship between the average formation pressure and the cumulative gas production, determine the average formation pressure of the gas storage on the ith day, and then obtain the reasonable gas production of the gas well in the gas storage on the ith day. The peak gas volume and the reasonable gas production volume of the gas well on the ith day can be used to obtain the number of gas production wells N required for the ith day in the gas production stage of the gas storage. i , select the maximum number of gas production wells required per day in the gas production stage of the gas storage as the number of gas production wells J required for the construction of the gas storage. Compared with the prior art, the invention determines the number of gas production wells in the gas storage by considering the gas production capacity change of the gas wells, which is more suitable for the actual situation on site, the calculation is more accurate, and the investment waste is avoided.

Description

technical field [0001] The invention belongs to the technical field of natural gas underground storage and gas reservoir engineering, and in particular relates to a method for determining the number of gas production wells in a gas storage depot considering the change in the productivity of gas wells. Background technique [0002] The construction of gas storage is an important means to adjust the balance of national natural gas supply and demand and ensure the safety of national gas supply. The calculation of the number of gas production wells is an important part of the calculation of the construction parameters of the gas storage. The calculation of the number of gas production wells must ensure that the sum of the daily gas production capacity of the gas production wells meets the requirements of the planned daily gas production of the gas storage. Peak shaving cannot achieve the planned daily gas production; on the contrary, the calculated number of wells is too large, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/02
CPCG06Q10/06315G06Q50/02
Inventor 刘鹏程安红燕兰义飞徐文赵忠军于占海叶珍肖峰李鹏冯敏张波席怡田清华
Owner PETROCHINA CO LTD
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