CN-117514050-B - Flushing while drilling tool and flushing while drilling method

CN117514050BCN 117514050 BCN117514050 BCN 117514050BCN-117514050-B

Abstract

The invention provides a flushing while drilling tool and a flushing while drilling method. The flushing while drilling tool comprises an outer shell, an upper sliding sleeve, a lower sliding sleeve, a first locking mechanism, a second locking mechanism, a first pressure-holding ball and a second pressure-holding ball, wherein a bypass hole is formed in the middle of the outer shell, a first sliding groove and a second sliding groove are formed in the inner portion of the outer shell, the upper sliding sleeve is slidably mounted in the first sliding groove, the lower sliding sleeve is slidably mounted in the second sliding groove, water hole mechanisms are formed in the upper sliding sleeve and the lower sliding sleeve, the bypass hole is connected with the second sliding groove, the upper sliding sleeve is connected with the outer shell through the first locking mechanism, the lower sliding sleeve is connected with the outer shell through the second locking mechanism, the first pressure-holding ball is mounted in the upper sliding sleeve in a rolling mode, and the second pressure-holding ball is mounted in the lower sliding sleeve in a rolling mode.

Inventors

ZHANG YANPING
PENG SONG
FENG LAI
LUO YONG
HE AIGUO
HE KUN
WANG JUN
WU QIANLI
CAO CHUAN
LIANG GUOHONG
HOU FUXIANG

Assignees

中国石油天然气集团有限公司
中国石油集团工程技术研究院有限公司
北京石油机械有限公司

Dates

Publication Date: 20260512
Application Date: 20220729

Claims (9)

1. A flushing tool while drilling is characterized by comprising an outer shell, an upper sliding sleeve, a lower sliding sleeve, a first locking mechanism, a second locking mechanism, a first pressure-holding ball and a second pressure-holding ball, wherein a bypass hole is formed in the middle of the outer shell, a first sliding groove and a second sliding groove are formed in the inner portion of the outer shell, the upper sliding sleeve is slidably arranged in the first sliding groove, the lower sliding sleeve is slidably arranged in the second sliding groove, water eye mechanisms are formed in the upper sliding sleeve and the lower sliding sleeve, the bypass hole is connected with the second sliding groove, the upper sliding sleeve is connected with the outer shell through the first locking mechanism, the lower sliding sleeve is connected with the outer shell through the second locking mechanism, the first pressure-holding ball is rotatably arranged in the upper sliding sleeve, the second pressure-holding ball is rotatably arranged in the lower sliding sleeve, a first cavity is formed in the middle of the first sliding groove, a second cavity is formed in the middle of the second sliding groove, the water eye mechanism comprises an upper water eye and a second water eye, the water eye mechanisms are connected with the first water eye and the second water eye and the upper side wall of the second water eye, and the water eye is connected with the upper water eye and the top of the second water eye.
2. The flushing while drilling tool of claim 1, wherein the first locking mechanism and the second locking mechanism are shear pins, an outer pin hole for installing the shear pins is formed in the outer shell, inner pin holes for installing the shear pins are formed in the upper sliding sleeve and the lower sliding sleeve, and two ends of the shear pins are installed in the outer pin holes and the inner pin holes in a one-to-one correspondence mode.
3. The while-drilling flushing tool of claim 1, wherein a first pressure-holding ball is abutted against the middle part of the upper sliding sleeve, a second pressure-holding ball is abutted against the bottom of the lower sliding sleeve, the lower sliding sleeve is abutted against the bottom of the outer shell, and the top of the outer shell is a stepped cavity.
4. The while-drilling flushing tool of claim 1, wherein the upper sliding sleeve is positioned above the lower sliding sleeve, and the first sliding groove is connected with the second sliding groove.
5. The while-drilling flushing tool of claim 1, wherein the outer housing, the upper sliding sleeve and the lower sliding sleeve are all tubular structures, and the outer diameter of the upper sliding sleeve is the same as the outer diameter of the lower sliding sleeve.
6. The flushing while drilling tool of claim 1, wherein the upper sliding sleeve is positioned on a rolling track of the second pressure holding ball, and the bypass hole is positioned on a sliding track of the lower sliding sleeve.
7. The while-drilling flushing tool of claim 1, wherein the upper sliding sleeve and the lower sliding sleeve are of an integrally formed structure, sealing sleeves are respectively arranged on the outer side walls of the upper sliding sleeve and the lower sliding sleeve, and the free ends of the sealing sleeves are abutted with the outer shell.
8. The flushing while drilling tool of claim 7, wherein the outer side walls of the upper sliding sleeve and the lower sliding sleeve are respectively provided with an anti-slip groove for installing the sealing sleeve, the sealing sleeve is installed in the anti-slip groove, and the sealing sleeve is made of fluororubber.
9. A method of flushing while drilling, characterized in that, based on a flushing while drilling tool as claimed in any one of the preceding claims 1 to 8, a method of flushing while drilling comprises: In the first state, liquid flows through the upper sliding sleeve and the lower sliding sleeve from the top of the outer shell and is discharged from the bottom of the outer shell; in the second state, a second pressure-holding ball is placed at the top of the outer shell, and under the action of water flow, the second pressure-holding ball is abutted with the bottom of the lower sliding sleeve and seals the bottom of the lower sliding sleeve, the lower sliding sleeve is separated from the second locking mechanism to slide downwards, and the bypass hole is communicated with a water hole mechanism on the lower sliding sleeve; and in the third state, the first pressure-holding ball is placed at the top of the outer shell, under the action of water flow, the first pressure-holding ball is abutted with the middle part of the upper sliding sleeve and seals the bottom of the upper sliding sleeve, the upper sliding sleeve is separated from the first locking mechanism and slides downwards and is abutted with the top of the lower sliding sleeve, and the lower sliding sleeve seals the bypass hole.

Description

Flushing while drilling tool and flushing while drilling method Technical Field The invention relates to the technical field of drilling flushing, in particular to a flushing while drilling tool and a flushing while drilling method. Background In the process of drilling, cement plugs are drilled to the designed well depth after casing cementing, and a well shaft cleaning pipe string is simultaneously connected when a plug pipe string is drilled, and in the transitional process from drilling to well completion, well shaft cleaning and fluid displacement have great influence on well completion quality, production efficiency and well profitability. Wellbore contamination can damage the formation and cause plugging, which is why many completions fail and costly remedies. The well bore cleaning operation can be carried out together, so that the operation times can be reduced, the drilling time can be saved, and the smooth transition from drilling to well completion operation can be realized. At present, the existing circulating flushing tool with the drift diameter is difficult to freely realize the switching of the water hole and the annular flow passage, the time required for cleaning a shaft is increased, and the overall working efficiency of drilling is reduced. Disclosure of Invention The invention aims to solve the technical problem of providing a flushing while drilling tool and a flushing while drilling method aiming at the defects of the prior art. The flushing while drilling tool comprises an outer shell, an upper sliding sleeve, a lower sliding sleeve, a first locking mechanism, a second locking mechanism, a first pressure-holding ball and a second pressure-holding ball, wherein a bypass hole is formed in the middle of the outer shell, a first sliding groove and a second sliding groove are formed in the inner portion of the outer shell, the upper sliding sleeve is slidably mounted in the first sliding groove, the lower sliding sleeve is slidably mounted in the second sliding groove, water hole mechanisms are formed in the upper sliding sleeve and the lower sliding sleeve, the bypass hole is connected with the second sliding groove, the upper sliding sleeve is connected with the outer shell through the first locking mechanism, the lower sliding sleeve is connected with the outer shell through the second locking mechanism, the first pressure-holding ball is rotatably mounted in the upper sliding sleeve, and the second pressure-holding ball is rotatably mounted in the lower sliding sleeve. The technical scheme of the invention has the advantages that the lower sliding sleeve is separated from the constraint of the second locking mechanism under the action of water pressure by putting the second pressure-blocking ball into the lower sliding sleeve, so that the lower sliding sleeve slides, the bypass hole and the water hole mechanism are opened, the circulation channel is opened, the annulus return speed is improved, the first pressure-blocking ball is put into the upper sliding sleeve, the upper sliding sleeve is separated from the constraint of the first locking mechanism under the action of water pressure, the upper sliding sleeve slides, the circulation channel is closed, the liquid flow path in the outer shell is changed, drilling fluid can flush the well wall with high efficiency after the flow channel is switched to the annulus, the switching of the water hole and the annulus flow channel is realized, the cleaning time is shortened, and the flushing effect and the working efficiency are improved. Further, a first cavity is formed in the middle of the first sliding groove, a second cavity is formed in the middle of the second sliding groove, the water hole mechanism comprises a first water hole used for being connected with the first cavity, a second water hole used for being connected with the second cavity and a third water hole used for being connected with the second cavity, the first water hole is located on the top side wall of the upper sliding sleeve, the second water hole is located on the bottom side wall of the upper sliding sleeve, and the third water hole is located on the top side wall of the lower sliding sleeve. The technical scheme has the beneficial effects that the cavity and the water hole are arranged, so that a circulating channel is formed conveniently, the water hole mechanism on the upper sliding sleeve is communicated with the water hole mechanism on the lower sliding sleeve conveniently, the liquid flow path inside the outer shell body is changed, the switching of the water hole and the annular flow channel is realized, the cleaning time is shortened, and the flushing effect and the working efficiency are improved. Further, the first locking mechanism and the second locking mechanism are shear pins, an outer pin hole for installing the shear pins is formed in the outer shell, an inner pin hole for installing the shear pins is formed in the upper sliding sleeve and the lower