Downhole multipath variable displacement circulating debris-carrying tool

A multi-path, variable-displacement technology, applied in the direction of flushing wellbore, wellbore/well components, earth-moving drilling, etc. Chip build-up, increased annular flow velocity, improved cleaning effectiveness

Active Publication Date: 2016-02-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 cu

Method used

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  • Downhole multipath variable displacement circulating debris-carrying tool
  • Downhole multipath variable displacement circulating debris-carrying tool
  • Downhole multipath variable displacement circulating debris-carrying tool

Examples

Experimental program
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Embodiment Construction

[0015] Such as figure 1 , figure 2 , image 3 As shown, a downhole multi-path variable displacement circulating rock carrying tool is composed of a primary circulating sub, a secondary circulating sub and a ball-catching tube; a secondary circulating sub, a primary circulating sub, a ball-catching tube and The secondary connection, the first-level circulation pup joint includes the upper joint I1, the outer cylinder 9 and the lower joint I15, the upper joint I1, the outer cylinder 9 and the lower joint I15 are connected in sequence, the inner wall of the upper end of the upper joint I1 is provided with a plug 2, and the upper joint I1 There are variable diameter ball seat 3 and central cylinder 4 in sequence, two bypass water holes I5 are symmetrically opened on the side wall of upper joint I1, and two central cylinder water holes 6 are symmetrically opened on the side wall of central cylinder 4. A central cylinder water eye 6 is provided with a central cylinder water eye Ⅰ...

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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 ...

Claims

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Application Information

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IPC IPC(8): E21B21/12E21B21/10
CPCE21B21/103E21B21/12
Inventor 徐涛施连海杨帆韩龙刘平全黄志强赵敏李磊兵赵洪涛姜荐中
Owner BC P INC CHINA NAT PETROLEUM CORP
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