Negative-pressure sand washer of horizontal well

Abstract

The invention provides a negative-pressure sand washer of a horizontal well. The negative-pressure sand washer comprises an outer barrel, a throat pipe, a center pipe, a nozzle, a connector and a baffle head. The upper portion of the connector is nested in the outer barrel to be in threaded connection with the same, the end face of the lower portion of the connector is connected with the baffle head, the outer wall of the front end of the connector is connected with the lower end of the center tube, the inner hole of the front end of the connector is connected with the lower end of the throat pipe, the throat pipe penetrates the upper end face of the center pipe from the inside of the center pipe, the nozzle is disposed in an inner hole of the lower portion of the throat pipe, the lower end face of the nozzle buttes against the end face of the inner hole of the front end of the connector, and an annular space is formed between the inner wall of the outer barrel and the outer walls of the center pipe and the front end of the connector. Continuous negative-pressure sand washing is realized in the horizontal-section shaft, meanwhile, the negative-pressure sand washer has functions of in-bushing scale removal and cement breaking, and the problem of incontinuity and serious dropout in the horizontal-well sand washing process is solved.

Description

technical field [0001] The invention belongs to the technical field of oil production in oil fields, and in particular relates to a negative pressure sand extractor for horizontal wells. Background technique [0002] With the advancement of horizontal well development technology, the length of horizontal sections, the number of stimulated sections and the scale of fracturing are increasing year by year, especially the scale of "volume fracturing" ("thousand square sand, million square liquid", segmented multi-cluster) of horizontal wells In the application, the problems such as short sand penetration cycle, large sand production volume and serious leakage in the wellbore of horizontal wells are becoming more and more serious, which affect the effective production capacity and the smooth development of later measures. It is necessary to carry out sand washing and well washing operations in time to ensure the smoothness of the wellbore. [0003] At present, the "conventional p...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a negative pressure sand pump for horizontal wells, which can realize continuous negative pressure sand pumping in the wellbore of the horizontal section, and at the same time have the functions of cleaning scale in the casing and breaking cement, so as to solve the problem of discontinuity in the process of sand flushing in horizontal wells. , missing serious problems

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