Self-heating natural gas hydrate preventing device

Abstract

The invention relates to a self-heating natural gas hydrate preventing device used for preventing the generation of natural gas hydrate, which can maintain the safety production of a gas well and improve the collection ratio of gas reservoir. The technical scheme is as follows: the device consists of a generating system, an electric heating system and a fixing system in a pipeline; impellers are concentrically arranged on a rotating shaft, partition plates are arranged between the adjacent impellers for division, the rotating shaft is connected with a generator and a overspeed protection device, and a gas inlet is arranged below the partition plates; a lead led out from the generating system is connected with an overheat protection device and a heating resistance wire screen, and a gas outlet is installed above the heating resistance wire screen; and a shell is installed outside the generating system and the electric heating system, a fishing head is installed at the top end of the shell, a sealing rubber ring is arranged in a gap between the shell and the wall of a shaft oil pipe, and an upper slip and a lower slip are installed between the device and the shaft oil pipe. The self-heating natural gas hydrate preventing device works by depending on stratum gas, heats continuously and stably, has obvious effects on increasing yield and saving energy, conducts the fishing operation by adopting steel wires, is convenient to operate and manage and can be applicable to production wells of natural gas.

Description

technical field [0001] The invention relates to a self-heating natural gas hydrate prevention and control device for preventing and preventing the wellbore of a natural gas wellbore from being blocked due to the generation of natural gas hydrate. Background technique [0002] During the extraction of natural gas, natural gas flows from the stratum into the wellbore, passes through the wellbore and reaches the ground. During this process, the temperature of the natural gas fluid decreases continuously in the wellbore. When the gas temperature is lower than the hydrate formation temperature, the gas hydrate will be generated in the wellbore, and in severe cases, the wellbore will be blocked. [0003] The commonly used methods to prevent and control the formation of natural gas hydrate in the wellbore of gas wells mainly include chemical inhibitor injection method and downhole throttling method. The chemical inhibitor injection method is to inject chemical agents on the ground...

AI Technical Summary

Problems solved by technology

The chemical inhibitor injection method is to inject chemical agents on the ground to inhibit the formation of natural gas hydrate in the wellbore. It needs to be injected regularly, and has disadvantages such as high cost, dangerous operation, and insufficient safety and environmental protection.

The downhole throttling technology relies on formation heat to heat the throttling gas to prevent hydrate formation. However, for gas wells with a large flow rate, the heat source provided by the formation is not enough to heat the wellbore fluid to a safe temperature in a short time. Hydrate plugging

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