Continuous positive and negative integrated sand washing device for oil well

Abstract

The invention relates to a continuous positive and negative sand washing device for an oil-water well, in particular to a continuous positive and negative integrated sand washing device for an oil well. The device consists of an operation machine, pipelines, a sand washing pipe, an elevator, a pump truck and the like, wherein a self-sealing wellhead is arranged at the upper end of a big four-way joint of the wellhead; the lower end of a sand washing pipe column is provided with a sand washer, and the upper end of the sand washing pipe column is provided with a reversing valve; the sand washing pipe column enters a well casing under the well through the self-sealing wellhead and the big four-way joint; a three-way valve is connected with a water hose and the self-sealing wellhead and is connected with a positive and negative sand washing regulation and control valve bank; the positive and negative sand washing regulation and control valve bank is in threaded connection with the pipelines respectively connected onto the pump truck, a foul solution cylinder, the three-way valve and the big four-way joint; the three-way valve realizes continuous sand washing operation in the process of carrying out continuous single-length sand washing and carrying out subsequent single-length sand washing by cooperation of the opening and closing of pairs of pipe lines with the reversing valve and the self-sealing wellhead; and the positive and negative sand washing regulation and control valve bank completes conversion by adjusting and aligning with four holes which are vertical in pairs on a valve core and eight holes on a valve body, so that the positive and negative continuous sand washing operation is realized.

Description

technical field [0001] The invention relates to a device for continuous, front and back sand washing of oil and water wells, in particular to a continuous, front and back integrated sand washing device for oil wells. Background technique [0002] At present, the sand washing operation of oil wells in oil fields usually adopts two methods: positive sand washing and reverse sand washing; the positive sand washing device has strong capacity, but the sand carrying capacity is weak, and it is easy to produce sand stuck or sand buried in the sand washing pipe string; The ability to carry sand is strong, but the sand washing ability is weak, and it is not easy to be impulsive; moreover, the pump must be stopped when the oil pipe is connected during the sand washing process, which not only affects the sand washing efficiency, but also cannot continuously provide sand washing fluid, and the washed sand will sink and settle , it is easy for the sand to get stuck in the pipe string; fo...

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Problems solved by technology

[0002] At present, the sand washing operation of oil wells in oil fields usually adopts two methods: positive sand washing and reverse sand washing; the positive sand washing device has strong capacity, but the sand carrying capacity is weak, and it is easy to cause sand stuck or sand buried in the sand washing pipe string; The ability to carry sand is strong, but the sand washing ability is weak, and it is not easy to be impulsive; moreover, the pump must be stopped when the oil pipe is connected during the sand washing process, which not only affects the sand washing efficiency, but also cannot continuously provide sand washing fluid, and the washed sand will sink and settle , it is easy for the sand to get stuck in the pipe string; for oil wells with mud in the sand, it is often necessary to use two methods in turn to complete the sand washing; and the conversion of the two methods requires re-installation of the ground sand washing pipeline, which not only increases the operation The labor intensity of the operator prolongs the operation time. What is more serious is that during this period, the mud and sand washed up earlier will re-precipitate, which will easily cause the sand to bury the sand washing pipe string, and even cause the oil well to be overhauled.

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