Device and method for clearing sand and water production in hydrate wells by utilizing bottom gas production

Abstract

The invention relates to a device for clearing away generated sand and water in a hydrate well through bottom layer produced gas. The device for clearing away the generated sand and water in the hydrate well through the bottom layer produced gas comprises a datum monitoring transmission system, a datum analyzing treatment system and an automatic reacting adjusting system; the datum monitoring transmission system monitors and transmits the temperatures, the pressure and the flow data of a hole mouth and the down hole position in real time; the datum analyzing treatment system calculates the gas flow needed for carrying the generated sand and water at the bottom hole and the inhibitor quantity needed for inhibiting hydrate generation in a production pipe pillar and sends out a corresponding gas flow adjusting instruction and a corresponding hydrate inhibitor injection instruction; and the automatic reacting adjusting system automatically adjusts a down-hole flow control valve according to the instructions of the datum analyzing treatment system and injects an appropriate quantity of a hydrate inhibitor into a casing annulus. According to the device for clearing away the generated sand and water in the hydrate well through the bottom layer produced gas, under the condition that normal production is not influenced, the generated sand and water in the hydrate well can be cleared away, and simultaneous exploitation of a natural gas hydrate reservoir and a bottom natural gas pool can be achieved.

Description

technical field [0001] The invention belongs to the field of exploration and development of natural gas hydrates, and in particular relates to a device and a method for removing sand and water in hydrate wells by using bottom gas production. Background technique [0002] Natural gas hydrate is a clean energy with high combustion energy. It is regarded as an alternative energy source for oil and gas by various countries. It is mainly distributed in deep sea sediments and land permafrost. my country is rich in gas hydrate reserves, especially in the South China Sea. my country's natural gas hydrate development is at the forefront of the world. At present, natural gas hydrate samples have been obtained in the Shenhu sea area in the northern South China Sea and the Qilian Mountain area in Qinghai, and a gas hydrate trial production project will be launched in the South China Sea soon. [0003] Existing natural gas hydrate production methods mainly include heat shock method, dep...

AI Technical Summary

Problems solved by technology

Aiming at the problem of sand production at the bottom of the well, there are many mature sand control methods, such as: sand control pipe string sand control, filling sand control, cementing formation, artificial well wall, sand arch sand control, etc., but after these sand control measures, it is not possible to completely Prevent fine sand particles from entering the production string, and sand production will inevitably occur in the production string

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