Drain method

Abstract

The invention discloses an oil drainage method, which belongs to the field of downhole operations. The method includes: lifting the sucker rod from the oil well, driving the swimming ball and the suction plunger to move to the wellhead; assembling the crowbar, the first weighted rod and the second weighted rod into a combined structure; In this combined structure, the pry tip at the bottom of the crowbar moves down to pry and fix the ball to open the oil drain passage; The pressure of the liquid column in the tube makes the pry tip move and fix the ball; retrieve the combined structure. The present invention adopts a combination structure, and the ball is fixed by prying with the tip of the prying tip and the oil drain channel is opened. The method has the advantages of convenient operation, high reliability, and is not restricted by tools and outer diameters. The combined structure has low cost, can be used repeatedly, and avoids the reduction of the pumping condition of the oil well pump.

Description

technical field [0001] The invention relates to the field of downhole operations, in particular to an oil drainage method. Background technique [0002] In the process of downhole operation, in order to prevent the oil in the tubing string from pouring into the well site, polluting the working environment of workers and endangering the health of workers, it is necessary to drain the oil in the tubing string to the casing through the drain hole inside. [0003] Oil drainage methods can generally be divided into two categories, one is to drain oil by changing the position and structure of the fixed ball, that is, adding a stopper that matches the modified fixed ball to the end of the plunger of the oil well pump. When draining oil, put the fixed ball into the locking structure at the end of the plunger to expose the oil drain hole for oil drain; the second is to drain oil through the oil drain hole plugged with pins on the side wall of the oil drainer , The oil drainer is ge...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides an oil draining method, which can solve the problem that the pump condition of the oil well pump is lowered during the current oil draining, or the oil drainer is limited by the tool and the outer diameter, and the one-time use of the oil drainer is inconvenient to operate and the cost is high, and The problem of poor reliability of the reusable oil drainer, the method is as follows:

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