Leakage-preventing compensation type reverse sand washing device and use method

Abstract

The invention discloses a leakage-preventing compensation type reverse sand washing device and a use method. The device comprises a central tube; the outer side of the central tube is sleeved with a connecting cylinder sleeve and an outer tube part; liquid inlets are formed in the top of the outer tube part; a packer part is arranged on the outer wall of the connecting cylinder sleeve; the bottomof the central tube can be glidingly sleeved with an inner sand-guiding sliding cylinder sleeve; a conical tube part with the diameter gradually increased from top to bottom is arranged at the bottomof the inner sand-guiding sliding cylinder sleeve; a liquid spraying hole is formed in the side wall of the conical tube part in a penetrating manner; the bottom of the connecting cylinder sleeve canbe glidingly sleeved with an outer sand-guiding sliding cylinder sleeve; the bottom of the conical tube part is connected with the inner wall of the outer sand-guiding sliding cylinder sleeve in a sealed and abutted manner; and the inner sand-guiding sliding cylinder sleeve and the outer sand-guiding sliding cylinder sleeve form sand-guiding double sliding cylinder sleeves. According to the deviceand the use method, formation sand in a shaft can be washed to the ground, by the aid of the compensation design of the sand-guiding double sliding cylinder sleeves, the formation sand is in the controllable range during sand washing, a sand washing liquid is prevented from being leaked into the oil layer, and the working cycle of an oil well is prolonged.

Description

technical field [0001] The invention relates to the technical field of oil well production, in particular to a leakage prevention compensation type reverse sand washing device and a use method thereof. Background technique [0002] When oil and water wells are used for sand flushing, due to oil layer leakage, the sand flushing fluid and the formation sand in the wellbore are washed into the lost oil layer and cannot be washed to the ground. If it enters the wellbore, it is very easy to cause sand sticking of the oil pump, stop production of the oil well, increase operating costs, shorten the pump inspection cycle of the oil well, and fail to achieve the operation purpose. [0003] Therefore, relying on many years of experience and practice in related industries, the inventor proposes a leak-proof compensation type reverse sand washing device and its use method to overcome the defects of the prior art. Contents of the invention [0004] The purpose of the present invention...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-leakage compensation type reverse sand washing device and its use method, which can overcome the problems in the prior art such as sand stuck and shut down caused by the leak. The sand is flushed to the ground, and through the compensation design of the sand guide double sliding cylinder liner, the formation sand is within the controllable range during the sand flushing, preventing the sand flushing fluid from leaking into the oil layer and prolonging the oil well operation cycle

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