A remote well natural gas recovery device

Abstract

The invention provides a remote well natural gas recovery device which mainly comprises a water jacket heater, a gas-liquid separator, a filter, a dehydration device, a reciprocating compressor, a gas charging pillar, a gas generating set and the like, and is characterized in that gas generated from a remote well is heated by a heating furnace, the heated gas enters the gas-liquid separator and the filter for separation and filtering to remove a liquid phase and a solid phase via separation and filtration, the filtered product is dehydrated by a molecular sieve, the dehydrated product enters the reciprocating compressor, the compressed product is pumped into a CNG trailer after being measured by the gas charging pillar to serve as CNG commercial gas for sale; when the CNG trailer containing the recovered gas is driven to a gas gathering station of a gas field, and the recovered gas is pumped into a pipe network again, charged gas enters a by-pass of the dehydration device directly; when the pressure in a well mouth is equal to or higher than 20 MPa, the charged gas enters a by-pass of the compressor directly; fuel gas of the gas generating set and the water jacket heater is supplied through a rear process pipeline of the dehydration device; and the whole set of the remote well natural gas recovery device is mounted on two semi-trailers, and fixedly erected on a well field via a hydraulic jack. The remote well natural gas recovery device is suitable for recovery of scattered natural gas in high-yield or intermittent-production remote wells of different well mouth pressures; the moving, transportation and mounting are convenient and fast; the adaptive capacity is high; and the recovery cost is low.

Description

technical field [0001] The invention relates to a device for safe, efficient and low-cost recovery of scattered natural gas, shale gas, oilfield associated gas, etc., which are located remotely and have no economic benefits by pipeline collection and transportation, and are filled into a CNG long-tube trailer. It relates to a remote well natural gas recovery device and belongs to the field of natural gas gathering and transportation engineering. Background technique [0002] During the exploration and development of conventional natural gas fields and unconventional natural gas fields such as shale gas, due to the need to drill wells, evaluation wells and other reasons, it is inevitable to produce some scattered and remote single wells with low production and far away from the gas gathering station. . In addition, during the development of oilfields, some oilfield-associated gas will be produced from crude oil, and its main component is also CH4, but the output is low. Due...

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Problems solved by technology

[0004] However, the existing scattered natural gas CNG recovery devices have the following deficiencies: 1) Skids for heating, separation, filtration, dehydration, compression, metering, etc. are set separately without integration. It is placed on the foundation of the well site, and the connecting pipelines between the skids are all connected by steel pipes. The transportation, installation and disassembly of the whole set of equipment are time-consuming and laborious. It is only suitable for the recovery of high-pressure stable production remote wells with low transportation frequency. , not suitable for the recovery of scattered natural gas in intermittent wells with low output and frequent relocation; 2) The dehydration device of the existing recovery device does not have a bypass, and the recovered gas is only considered to be directly sold as CNG commercial gas or transported to natural gas The injection pipeline network of gas gathering stations, export stations and other gas fields cannot meet the actual needs of some gas fields. The recovery device can be sold as CNG commercial gas and injected into the pipeline network inside the gas field.

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