Integrated pipe column for steam injection, leakage prevention, well backwashing and production of thermal production well

Abstract

The invention discloses an integrated pipe column for steam injection, leakage prevention, well backwashing and production of a thermal production well. The integrated pipe column comprises an oil pipe, a lifting pump, a downhole multifunctional control valve and a sealing plug. The sealing plug is sleeved with a sealing barrel and a downhole positioning tool, wherein the lower end of the sealingbarrel is connected with the upper end of the downhole positioning tool through a threaded nipple; a positioning locking claw is arranged on the outer wall of the downhole positioning tool, the lowerend of the downhole positioning tool is fixed on the sealing plug through a shear pin, a horse tooth buckle is arranged on the outer wall of the positioning locking claw, the horse tooth buckle of thepositioning locking claw is oppositely buckled with a horse tooth buckle in a packer for well staying, and the lower end of the packer is connected with a sand filtering pipe. The problems that threetimes of operation are needed for steam injection, back flushing and production, and time and labor are wasted are solved, and the problem that the temperature of an oil layer is reduced due to backflushing of an existing steam injection thermal production well is solved, so that the steam injection effect is ensured.

Description

technical field [0001] The invention relates to the field of production pipe strings in thermal recovery wells in oil fields, in particular to the integrated pipe strings for steam injection in thermal recovery wells, backwashing wells for leakage prevention and production. Background technique [0002] Heavy oil thermal recovery wells need to be soaked after steam injection. After soaking, the wells are blown out, and then the backwash string is lowered for backwash operation, and then the production string is lowered for oil production. This method mainly has the following disadvantages: three operations are required for steam injection, backwashing, and production, and the operation procedures are cumbersome, troublesome, and expensive. Especially after high-temperature steam injection, the wellbore temperature and pressure are relatively high, and the operation risk is relatively high. At the same time, after the steam injection, the backwashing well string is lowered. W...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an integrated pipe string for steam injection, leakage prevention, backwashing, and production in thermal recovery wells, so as to solve the problems of three times of steam injection, backwashing, and production, which are time-consuming and labor-intensive, and the existing steam injection heat The backwashing of the production well causes the temperature of the oil layer to drop, so as to ensure the effect of steam injection

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