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A gas well single well gas recovery system and its low-pressure extraction method

A technology for gas production and gas wells, applied in wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problems of high energy consumption and high operating cost, and achieve the effect of high single-stage pressure ratio

Active Publication Date: 2017-02-08
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas lift drainage gas recovery process needs to add compressors and other power equipment at the wellhead, which has the disadvantages of high energy consumption and high operating costs

Method used

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  • A gas well single well gas recovery system and its low-pressure extraction method
  • A gas well single well gas recovery system and its low-pressure extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The natural gas wells in the middle and late stages become low-pressure gas wells due to the reduction of formation pressure. Bottom water and condensate oil will stay at the bottom of the well and form bottom-hole fluid accumulation, resulting in deterioration of production conditions and reduction of natural gas production. In order to effectively eliminate bottom-hole accumulation, increase single-well production of low-pressure gas wells, and overcome the defects of existing techniques such as jet drainage, drainage gas recovery, and gas lift, this embodiment provides a gas well single-well gas recovery system.

[0032] Such as figure 2 As shown, a gas well single-well gas production system includes a downhole oil casing 1, a wellhead gas production device 2, a wellhead gas production valve group 3 and a gas gathering station, which are sequentially connected through a gas production main pipe 4-4. The gas well single well gas production system of this embodiment a...

Embodiment 2

[0043] Adopt the gas well single well gas production system described in embodiment 1, combine figure 1 and figure 2 , this embodiment describes the low-pressure drainage method.

[0044] Normally, the natural gas produced by the downhole oil casing 1 and the bottomhole liquid carried in the natural gas enter the wellhead gas production valve group 3 through the wellhead gas production device 2, and are transported to the downstream gas collection through the gas production main pipe 4-4 stand. In this embodiment, a synchronous rotary pressurization integrated device 4 is installed on the main gas production pipe 4-4 between the wellhead gas production valve group 3 and the gas gathering station. The principle of synchronous rotary supercharging integrated device 4 to realize pressurization and discharge of bottom-hole fluid can be described as: through the suction effect of the synchronous rotary compressor unit in the synchronous rotary supercharging integrated device, th...

Embodiment 3

[0048] In order to compare the change of the natural gas production of a gas well single well before and after boosting, the low-pressure extraction method of the gas well single well gas production system provided by the present invention is applied to the Sulige Gas Field, and the change of the natural gas flow rate of the gas well single well before and after boosting is recorded . In order to better illustrate the beneficial effect of this method, a brief overview of the Sulige Gas Field is now given.

[0049] The Sulige gas field is a typical "low pressure, low permeability, and low abundance" three-low gas field. It is very difficult to develop, and effective development is a world-class problem. Single well production is low, with an average of only 1×10 4 m 3 / d, the original formation pressure of the gas well is as high as above 25MPa; after the well is opened, the pressure drops below 5MPa within a short period of time (6-8 months). Current pressurization situation...

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Abstract

The invention discloses a gas well single well gas recovery system and a low-pressure recovery method thereof. The gas well single well gas recovery system comprises a downhole oil bush, wellhead gas recovery device, a wellhead gas recovery valve group, a gas collecting station and a synchronous rotation pressurizing integrating device which are sequentially connected through a gas recovery main pipe. The synchronous rotation pressurizing integrating device is disposed on the gas recovery main pipe between the wellhead gas recovery valve group and the gas collecting station. The low-pressure recovery method includes setting the synchronous rotation pressurizing integrating device on the well field behind of the wellhead gas recovery valve group. By the synchronous rotation pressurizing integrating device added to the gas well single well gas recovery system, liquid accumulated at shaft bottom can be discharged simply, efficiently, safely and reliably, gas-liquid mixed transportation synchronous pressurizing is achieved, single well yield of middle-late-period natural gas wells is increased, and cost and energy consumption of gas well production are lowered.

Description

technical field [0001] The invention belongs to the technical field of gas well drainage and production increase in oil and gas fields, and relates to a gas well single-well gas production system equipped with a synchronous rotary pressurization integrated device, in particular to a gas well single-well gas production for low-pressure suction to discharge natural gas well liquid accumulation and increase production Systematic low pressure extraction method. Background technique [0002] During the production of natural gas, the gas well pressure and natural gas flow rate gradually decrease, and the condensate or produced water in the gas well cannot be carried out of the wellbore by the natural gas flow, but stays in the wellbore. Natural gas wells, especially natural gas wells in the middle and later stages of production, become low-pressure gas wells due to lower formation pressure. Low-pressure gas wells generally have the characteristics of low pressure, low production, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/25
Inventor 刘子兵薛岗冯凯生梁璇玑
Owner XIAN CHANGQING TECH ENG
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