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Double-pressure system for gas collecting station and gas collecting method of double-pressure system

A gas gathering station and dual pressure technology, applied in the field of oil and gas fields, can solve the problems of high investment in the construction of single wells and gas gathering stations, large scale of ground system construction, low system matching degree, etc., and achieves economical selection of pressurization timing and investment costs. The effect of reduction and installation cost reduction

Pending Publication Date: 2020-11-13
XIAN CHANGQING TECH ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose is to overcome the development method of large well clusters in tight gas fields in the existing technology. Due to the high initial gas production of a single well cluster, the large scale of surface system construction, the high investment in the construction of single wells and gas gathering stations, as the pressure and gas flow of gas wells decrease, the surface has already The matching degree of the construction system is reduced, and the adaptability of the later development and construction becomes poor.

Method used

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  • Double-pressure system for gas collecting station and gas collecting method of double-pressure system
  • Double-pressure system for gas collecting station and gas collecting method of double-pressure system
  • Double-pressure system for gas collecting station and gas collecting method of double-pressure system

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a dual-pressure system of a gas gathering station includes a medium-pressure gas-gathering unit and a low-pressure gas-gathering unit. Connect to the gas inlet of the medium-pressure gas production main pipe, and connect the outlet of the medium-pressure inlet area to the inlet of the medium-pressure separator; the low-pressure gas-collecting unit includes the low-pressure inlet area unit, low-pressure separator and compressor, and the The inlet is connected to the gas inlet of the low-pressure gas extraction main pipe, the outlet of the low-pressure station unit is connected to the inlet of the low-pressure separator, and the gas outlet of the low-pressure separator is connected to the inlet of the compressor; the outlet of the medium-pressure separator and the outlet of the compressor pass through the set The air-branch trunk lines are converging and exported.

[0032] In the dual-pressure system of the gas gathering station provided by the...

Embodiment 2

[0034]On the basis of Embodiment 1, a meter is further included, and the outlet of the medium-pressure separator and the outlet of the compressor are both connected to the meter. The meter is an existing meter, which can measure parameters such as gas output volume, pressure and temperature of the gas gathering station, and improve measurement accuracy.

[0035] Further, it also includes a pig, the medium-pressure inbound area unit is connected to the medium-pressure separator through the pig, and the low-pressure inbound area unit is connected to the low-pressure separator through the pig. The pig is an existing pig, and the pig is equipped with an electric emergency shut-off valve, which can ensure the safety of the low-pressure station area unit, the gas-gathering branch line and the station.

[0036] Further, it also includes an alcohol injection device and a methanol tank, the outlet of the methanol tank is connected to the inlet of the alcohol injection device, and the o...

Embodiment 3

[0045] Such as Figure 2-4 As shown, on the basis of Example 2, a gas-gathering method of a dual-pressure system of a gas-gathering station is adopted. In the early stage of gas-gathering, a medium-pressure gas-gathering unit is used for gas-gathering; The gas unit collects gas together; in the later stage of gas collection, low-pressure gas collection unit is used to collect gas;

[0046] The gas collection method of the medium-pressure gas-gathering unit is as follows: the incoming gas from the medium-pressure gas production main pipe enters the medium-pressure station area unit, and after the pigs clean the medium-pressure station area unit and the pipeline, the incoming gas enters The medium-pressure separator performs gas-liquid separation, and the separated gas is measured by a meter and then transported to the next gas-gathering station or treatment plant;

[0047] The gas collection method of the low-pressure gas-collecting unit is as follows: the incoming gas from th...

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Abstract

The invention belongs to the technical field of oil and gas fields and particularly provides a double-pressure system for a gas collecting station and a gas collecting method of the double-pressure system. In the earlier stage of gas collection, a medium-pressure gas collecting unit is used for collecting gas; in the middle stage of gas collection, the medium-pressure gas collecting unit and a low-pressure gas collecting unit are jointly used for collecting gas; in the later stage of gas collection, the low-pressure gas collecting unit is used for collecting gas, the problems that in the priorart, a dense gas field adopts a multi-well cluster development mode; due to the fact that in the initial stage, the gas yield of a single well cluster is high, the ground system construction scale islarge, and the construction investment of a single well and the gas collecting station is high; as the gas well pressure is reduced and the gas amount is reduced, the matching degree of the established system on the ground is reduced, and the later development and construction adaptability is poor are solved; and an alcohol injection process is matched with double-pipe double-pressure concentrated transportation, a mixed gas collection process of downhole throttling, early-stage concentrated alcohol injection and late pressurization mining is formed, the pipe diameter of a gas collecting pipeline is reduced effectively, the matching degree of the pipeline to the pressure system is increased, the adaptability of the process is improved, the selection of the pressurization opportunity is more economical, and the adaptability to subsequent development and construction is stronger.

Description

technical field [0001] The invention belongs to the technical field of oil and gas fields, and in particular relates to a dual-pressure system of a gas gathering station and a gas gathering method thereof. Background technique [0002] The downstream market demand for natural gas is strong, and the gas supply pressure of Changqing Gas Field is increasing. Gas production in 2019 reaches 412×10 8 m 3 / a, especially for supply guarantees in winter, involving livelihood projects, the daily demand for gas supply far exceeds the normal production level. [0003] According to the second accelerated development goal of Changqing Oilfield Branch and the plan of the group company, by 2020, the natural gas output of Changqing Gas Area will reach 420×10 8 m 3 . Sulige gas field is rich in tight gas resources, which is the guarantee of 420×10 natural gas in Changqing gas area in 2020. 8 m 3 / a An important guarantee for increasing and stabilizing production. [0004] In recent ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D1/02F17D3/12F17D3/14F17D3/18
CPCF17D1/02F17D3/12F17D3/145F17D3/18
Inventor 李颖琪王登海郑欣刘银春杨光杨莉安维杰卢鹏飞
Owner XIAN CHANGQING TECH ENG