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A method for determining the number of gas production wells in a gas storage tank considering the productivity change of gas wells

A determination method and technology of gas storage, applied in the direction of data processing applications, instruments, resources, 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: 2019-01-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • 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 a gas storage tank considering the productivity change of gas wells
  • A method for determining the number of gas production wells in a gas storage tank considering the productivity change of gas wells
  • A method for determining the number of gas production wells in a gas storage tank considering the productivity change of gas wells

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Experimental program
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Effect test

Embodiment 1

[0037] 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:

[0038] Step 1) According to the production capacity test data in the gas storage construction area, select two production data points, substitute them into the gas well productivity equation, and solve the coefficients a and b of the gas well productivity equation;

[0039] Step 2) Determine the bottomhole flow pressure of the gas well under different daily gas production according to the wellbore pipe flow equation and the gas production wellhead pressure;

[0040] Step 3) In the same coordinate system, draw different average formation pressure P according to the gas well productivity equation e Under the condition, the daily gas production q and the bottom hole pressure P wf At the same time, according to the wellbore pipe flow equation, the daily gas production q of the gas production ...

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 the change in gas well productivity, including the following steps:

[0051] Step 1. According to the production dynamic data and productivity well test data of gas wells in the construction area of ​​the gas storage, select two production data points and substitute them into the productivity equation. After the simultaneous equations, the coefficients a and b of the gas well productivity equation are solved; The monthly deceleration rate of production is less than 5%, and the monthly deceleration rate of bottom hole 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 bottomhole flowing press...

Embodiment 3

[0072] This embodiment further describes the present invention through the determination of the number of gas production wells in a certain gas storage. The determination steps are as follows:

[0073] Step 1. Using the well test data of a certain gas storage to obtain the gas well productivity equation:

[0074]

[0075] Step 2. Select tubing size 3 1 / 2 in, wellhead pressure 3MPa to determine the wellbore flow equation.

[0076] Step 3, according to gas well productivity equation and flow equation draw inflow and outflow curve intersection chart (see figure 2 ), select 5 junctions 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 A point means that when the average formation pressure is 29MPa, the bottomhole 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 similar meanings. According to the average formation pressure of the intersecti...

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Abstract

The invention provides a method for determining the number of gas production wells in a gas storage tank considering the productivity change of a gas well. Through the intersection fitting of gas wellproductivity equation and wellbore tubular flow equation, the regression function of average formation pressure and reasonable daily gas production data of gas production well is obtained, as well asthe fitting function relationship between average formation pressure and cumulative gas production, determine the average formation pressure on day i of the gas storage, and then obtaining the reasonable gas production of the gas well of the gas storage depot on the i day, through peak shaving on the first day of gas storage and reasonable gas production on the first day of gas well, the number of gas production wells Ni needed in the first day of gas production stage is obtained, and the maximum number of gas production wells needed in the gas production stage of gas storage is selected as the number of gas production wells J needed in gas storage construction. As compared with that prior art, the invention determines the numb of gas production wells in the gas storage tank by considering the change of gas production capacity of the gas wells, which is more fit with the field reality, more accurate in calculation and avoids investment waste.

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 of a gas storage in consideration of the productivity change of gas wells. Background technique [0002] The construction of gas storage is an important means to adjust the national natural gas supply and demand balance 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. If the calculated number of wells is too small, the gas storage Peak shaving cannot reach the planned daily gas production; on the c...

Claims

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Application Information

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Patent Type & Authority Applications(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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