Medium-pressure gas collection technique based on cluster well

Abstract

The invention relates to a gas field transmission device based on a cluster well, in particular to a medium-pressure gas collection technique based on the cluster well, comprising gas wells, gas collecting branches, gas collecting main pipes, and a gas collection station in the cluster well set, wherein each gas well is provided with a well throttling machine. The medium-pressure gas collection technique is characterized in that: each gas well is used for reducing the well mouth pressure to the medium pressure through the well throttling machine, and uniformly transmits the natural gas generated by the gas wells of the cluster well set through a well mouth device and the gas collection branches to the next gathered well set after counting; the peripheral cluster well sets are gathered to be sent to the gas collection station through the gas collection main pipes; methanol injecting pipelines are arranged along the gas collection branches in the same slot to inject methanol to the cluster well sets through methanol injecting devices; and the methanol injecting devices are synchronously used to inject the methanol to the well set and the peripheral well sets. Under the condition of saving cost and simplifying technique, the natural gas in the well can be safely transported to a center processing factory to manage by fully using formation pressure without a heating furnace on the well mouth or the gas collection station, and a compressor at the gas collection station.

Description

technical field [0001] The invention relates to a gas field gas transmission device based on cluster wells, in particular to a medium-pressure gas gathering process based on cluster wells. Background technique [0002] Gas gathering methods commonly used in gas fields include high pressure gas gathering method and medium and low pressure gas gathering method. [0003] The high-pressure gas gathering method is mainly suitable for gas fields with high output and strong production stability. Since the natural gas output directly from the well has a high pressure, in order to safely transport the natural gas to the gas gathering station for gas-liquid separation, the natural gas is then transferred to the To transport to the central treatment plant for deoiling and dehydration, it is necessary to inject hydrate inhibitor methanol into the wellhead from the gas gathering station to prevent the pipeline from freezing and blocking. When the number of wells in the gas field is larg...

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Problems solved by technology

Cluster wells are to build several gas wells in one well site, generally 3 to 9 wells. The production of the well group is high, and the pressure decline is relatively slow. If the gas gathering station installs the compressor in advance, it is not conducive to the utilization of formation pressure; the diameter of the gas production pipeline increases, which increases the project investment and operation cost

If the high-pressure gas gathering method is used, the stable production time is relatively short compared with the high-yield gas field, and the design pressure of the pipeline is high, so it is abandoned prematurely; the alcohol injection pipeline is injected at the gas gathering station, resulting in high design pressure, long pipeline, high investment, and poor overall economy

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