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Establishment method and application of a three-parameter gas well drainage and gas recovery process optimization model

A drainage gas recovery and establishment method technology, which is applied in the field of establishment of gas well drainage gas recovery process optimization model, can solve the problems of early decline period, lower recovery rate, rapid decline of gas production, etc., and achieve the effect of rapid determination

Active Publication Date: 2020-04-14
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impact on production after the gas well produces water is mainly manifested in: the gas production rate drops rapidly, the decline period is advanced, and the ultimate recovery factor is greatly reduced

Method used

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  • Establishment method and application of a three-parameter gas well drainage and gas recovery process optimization model
  • Establishment method and application of a three-parameter gas well drainage and gas recovery process optimization model
  • Establishment method and application of a three-parameter gas well drainage and gas recovery process optimization model

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1, a method for establishing a three-parameter gas well drainage and gas recovery process optimization model, the method includes the following steps:

[0026] a. Collect the production parameters of water-producing gas wells in the gas field block, including: daily gas production 0~4×10 4 m 3 , gas-water ratio 0~100m 3 / 10 4 m 3 , tubing inner diameter 4.0 inches, 3.5 inches, 3.0 inches, 2.5 inches, 2.0 inches, 1.5 inches, air-water interfacial tension is 60 mN / m, formation water density 1.01 kg / m 3 , natural gas density 0.58 kg / m 3 , deep is 2000~4000 m, formation pressure 2.5~8.1 MPa, wellhead pressure 2.5~4.1 MPa, bottom hole temperature 80~130 ℃;

[0027] b. In the range of well depth 2000-4000 m, calculate the critical liquid-carrying flow rate of natural gas under different daily gas production and water-gas ratio of a given tubing diameter, and choose the following one for the calculation model of critical liquid-carrying flo...

Embodiment 2

[0038] Embodiment 2, a method for establishing a three-parameter gas well drainage and gas recovery process optimization model, the method includes the following steps:

[0039] a. Collect the production parameters of water-producing gas wells in the gas field block, including: daily gas production 0~6×10 4 m 3 , gas-water ratio 0~100m 3 / 10 4 m 3 , tubing inner diameter 3.5 inches, 3.0 inches, 2.5 inches, 2.0 inches, 1.5 inches, air-water interfacial tension is 60 mN / m, formation water density 1.01 kg / m 3 , natural gas density 0.58 kg / m 3 , deep 1800~3200m, formation pressure 2.5~8.1 MPa, wellhead pressure 4.5~6.1MPa, bottom hole temperature 90~135℃;

[0040] b. In the range of well depth 1800-3200m, calculate the critical liquid-carrying flow rate of natural gas under different daily gas production and water-gas ratio of a given tubing diameter, and choose the following one for the calculation model of critical liquid-carrying flow rate of natural g...

Embodiment 3

[0045] Embodiment 3, the application of a three-parameter gas well drainage and gas recovery process optimization model, the application steps are as follows:

[0046] a'. Collect parameters of water-producing gas wells in the gas field block; gas production on June 15, 2015 was 3.8×10 4 m 3 , water-air ratio 15m 3 / 10 4 m 3 , The depth of gas well A is 2900m;

[0047] b', combine figure 2 It can be seen that the gas well A located in area I can normally carry liquid and produce without any drainage and gas recovery process. Gas production on July 15, 2015: 3.0×10 4 m 3 , water vapor ratio 20m 3 / 10 4 m 3 . combine image 3 It can be seen that the gas well A is located in area II, and adopts one or two drainage gas recovery techniques of the preferred pipe string or foam;

[0048] c'. Prediction and optimization of pipe string drainage gas recovery process during one year of natural gas production increase Q=36×10 4 m 3 , natural gas price J=1.978 yuan / m 3 , i...

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Abstract

The invention relates to the technical field of natural gas exploitation and in particular relates to a building method and an application of a three parameter-gas well drainage gas recovery technology optimizing model. A difficulty of rapid selection of drainage gas recovery technology for water-producing gas well is solved. The building method comprises steps of first, collecting production parameters of a water-producing gas well of a gas field, then calculating different daily gas production of a given oil pipe aperture and natural gas critical liquid carrying flow under a water-gas ratio at different well depths, drawing out natural gas critical liquid carrying flow curves (a,b) of maximum and minimum oil pipe apertures on daily gas production, water-gas ratio and well depth three-dimensional model, and drawing out a curve (c) with liquid production amount being 95m<3> on the three-dimensional model. The natural gas critical liquid carrying flow calculated by the method meets on-site production condition in a better way; and the building method is advantaged by quick determination of gas well drainage gas recovery technology based on simple parameters such as daily gas production, water-gas ratio and the well depth.

Description

technical field [0001] The invention relates to the technical field of natural gas exploitation, in particular to a method for establishing an optimal model of a gas well drainage and gas recovery process and its application. Background technique [0002] There are edge water and bottom water in Daqing gas field, and most of the water produced by gas wells is edge water, bottom water and some external water. The impact on production of gas wells after water production is mainly manifested in the following aspects: rapid decline in gas production, early decline period, and significant reduction in ultimate recovery. On the basis of many years of development practice in Daqing Gas Field, the following technologies have been gradually formed, including six sets of commonly used drainage and gas recovery technologies including optimized pipe string, foam row, mechanical pumping, eddy current, electric submersible pump, and plunger. Quickly and accurately determining the optimal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/367
Inventor 张永平徐德奎马品刚王景芹马文海王长根李俊亮李楠张洪涛杨强
Owner PETROCHINA CO LTD
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