Building method and application of three parameter-gas well drainage gas recovery technology optimizing model

A drainage gas recovery, three-parameter technology, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve the problems of early decline period, rapid decline in gas production, and reduced recovery factor, and achieve the effect of rapid determination

Active Publication Date: 2017-04-19
PETROCHINA CO LTD +1
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  • 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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  • Building method and application of three parameter-gas well drainage gas recovery technology optimizing model
  • Building method and application of three parameter-gas well drainage gas recovery technology optimizing model
  • Building method and application of three parameter-gas well drainage gas recovery technology optimizing model

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Embodiment 1

[0027] Embodiment 1, a method for establishing a three-parameter gas well drainage gas production process optimization model, the method includes the following steps:

[0028] a. Collect the production parameters of water-producing gas wells in the gas field, including: daily gas production 0~4×10 4 m 3 , Air-water ratio 0~100 m 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 interface tension 60 mN / m, formation water density 1.01 kg / m 3 , Natural gas density 0.58 kg / m 3 , Jing Shen 2000~4000 m, formation pressure 2.5~8.1 MPa, wellhead pressure 2.5~4.1 MPa, bottom hole temperature 80~130 ℃;

[0029] b. Calculate the critical liquid-carrying flow rate of natural gas under different daily gas production and water-to-gas ratio for a given tubing diameter in the range of 2000-4000 m deep well. The critical liquid-carrying flow rate calculation model for natural gas is one of the following: Q c =αQ c (Turner ...

Embodiment 2

[0040] Embodiment 2, a method for establishing a three-parameter gas well drainage gas production process optimization model, the method includes the following steps:

[0041] a. Collect the production parameters of water-producing gas wells in the gas field, including: daily gas production 0~6×10 4 m 3 , Air-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 interface tension 60 mN / m, formation water density 1.01 kg / m 3 , Natural gas density 0.58 kg / m 3 , Jing Shen 1800~3200m, formation pressure 2.5~8.1 MPa, wellhead pressure 4.5~6.1MPa, bottom hole temperature 90~135℃;

[0042] b. Calculate the critical liquid-carrying flow rate of natural gas under different daily gas production and water-to-gas ratio for a given tubing diameter in the range of 1800~3200m. The calculation model of natural gas critical liquid-carrying flow rate selects one of the following: Q c =αQ c (Turner model) +βQ c (Li Min m...

Embodiment 3

[0047] Embodiment 3, the application of a three-parameter gas well drainage gas production process optimization model, the application steps are as follows:

[0048] a’. Collect the parameters of water-producing gas wells in the gas field block; the gas production volume on June 15, 2015 is 3.8×10 4 m 3 , Water-air ratio 15m 3 / 10 4 m 3 , Gas well A is 2900m deep;

[0049] b’, combined figure 2 It can be seen that the gas well A is located in area I and can normally carry liquid for production without any drainage gas production technology. Gas production volume 3.0×10 on July 15, 2015 4 m 3 , Water to air 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 uses one or two drainage gas production processes among the preferred string or foam;

[0050] c’. Predict the increase in natural gas production during the one-year use of the optimal pipe string drainage gas production technology Q=36×10 4 m 3 , Natural gas price J=1.978 yuan / ...

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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 a gas well drainage gas production process optimization model and its application. Background technique [0002] The Daqing gas field has edge water and bottom water, and most of the water produced by gas wells is edge water, bottom water and some external water. The impact of gas wells on production is mainly manifested as: gas production declines rapidly, the decline period is advanced, and the final recovery rate is greatly reduced. On the basis of many years of development and practice, Daqing Gas Field has gradually formed the following process technologies including: optimization of pipe string, bubble drainage, mechanical pumping, eddy current, electric submersible pump, plunger and other six sets of more commonly used drainage gas production technology, but how The rapid and accurate determination of the optimal drainage gas producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
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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