Downhole multipath variable displacement circulating debris-carrying tool

Abstract

The invention relates to a horizontal well construction tool, in particular to a downhole multipath variable displacement circulating debris-carrying tool. A secondary circulating nipple, a primary circulating nipple and a ball catching cylinder of the tool are sequentially connected with one another; the primary circulating nipple comprises an upper joint I, an external cylinder and a lower joint I; the upper joint I, the external cylinder and the lower joint I are sequentially connected with one another; an end cap is arranged on the inner wall of the upper end of the upper joint I; a reducing ball seat and a center cylinder are sequentially arranged in the upper joint I; and two bypass water holes I are symmetrically formed in the lateral wall of the upper joint I. According to the downhole multipath variable displacement circulating debris-carrying tool, opening or closing the bypass water holes is achieved by pitching a plurality of times when a horizontal section is drilled; a plurality of circulating paths are provided; double-side circulation of the closed main water hole and single-side circulation or double-side circulation of the interconnected main water hole can be achieved; the annular velocity is increased; annular large-displacement flushing is achieved; and the roles of retarding debris accumulation and clearing accumulated debris are achieved; and the cleaning effect of boreholes is improved.

Description

Technical field: [0001] The invention relates to a horizontal well construction tool, in particular to an underground multi-path variable-displacement circulation rock-carrying tool. Background technique: [0002] Horizontal wells are an important technology for developing oil and gas fields to enhance recovery and economic benefits. With the continuous advancement of petroleum technology, horizontal well drilling and supporting technologies have been continuously improved. For horizontal wells, the quality of wellbore cleaning is directly related to the success or failure of an oil well drilling. Based on the situation of horizontal well drilling in my country for many years, the phenomenon of tripping and sticking directly caused by the failure of downhole cuttings to be fully cleaned occurs from time to time. According to statistics, downhole complex situations and stuck pipe accidents due to the existence of cuttings beds accounted for 3.43% to 11.67% of the timeliness ...

AI Technical Summary

Problems solved by technology

It overcomes the disadvantages that the existing cuttings removal tool cannot move the cuttings upwards and return to the ground after stirring the cuttings bed deposited on the well wall, and cannot prevent the cuttings from continuing to accumulate, and the removal effect of cuttings is not ideal.

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