Casing windowing method and tool using coiled tubing

Patent metadata

Field	Value
Publication number	US-10450801-B2
Application number	US-201615363699-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Dec 1, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

The present disclosure provides a casing windowing method and tool using coiled tubing; the windowing method comprises the steps of: a) preparing a borehole, including drifting a casing, and scraping an inner wall of the casing; b) hanging a positioning assembly in the casing, including seating the positioning assembly at a wellhead of the borehole, and after the positioning assembly is put down to a predetermined position in the casing, hanging a hanger of the positioning assembly at the inner wall of the casing; c) fixing a whipstock at a down-hole of the borehole, including seating the whipstock at the wellhead, and inserting a guiding assembly of the whipstock into the hanger so that an orientation of a window inclined plane of the guiding assembly meets a requirement of window orientation; and d) windowing the casing, including seating a tapered windowing mill at the wellhead, and after the tapered windowing mill is put down to the window inclined plane of the guiding assembly, starting the tapered windowing mill to perform a window sidetracking of the inner wall of the casing. The casing windowing method and tool using coiled tubing of the present disclosure can accurately adjust the orientation of the inclined plane of the whipstock, and the operation is simpler, safer and more reliable.

First claim

The invention claimed is:

1. A casing windowing method using coiled tubing, comprising the steps of:
a) preparing a borehole, including drifting a casing, and scraping an inner wall of the casing;
b) hanging a positioning assembly in the casing, including seating the positioning assembly at a wellhead of the borehole, connecting the coiled tubing to the positioning assembly and then putting the positioning assembly down into the casing using the coiled tubing, and after the positioning assembly is put down to a predetermined position in the casing, hanging a hanger of the positioning assembly with an inclined port at the inner wall of the casing, measuring and recording an orientation of the inclined port of the hanger using a logging instrument connected to the positioning assembly;
c) fixing a whipstock within the borehole, including seating the whipstock at the wellhead, adjusting the direction of a window inclined plane of a guiding assembly of the whipstock on the ground relative to the coiled tubing in response to the recorded orientation of the inclined port of the hanger, connecting the coiled tubing to the whipstock and then putting the whipstock down into the casing using the coiled tubing, and inserting the guiding assembly of the whipstock with an inclined end face that can be fitted with the inclined port into the hanger until the inclined end face of the guiding assembly is aligned with the inclined port of the hanger so that an orientation of the window inclined plane of the guiding assembly meets a requirement of window orientation; and
d) windowing the casing, including seating a tapered windowing mill at the wellhead, connecting the coiled tubing to the tapered windowing mill and then putting the tapered windowing mill down into the casing using the coiled tubing, and after the tapered windowing mill put down to the window inclined plane of the guiding assembly, starting the tapered windowing mill to perform a window sidetracking of the inner wall of the casing.

2. The casing windowing method using coiled tubing according to claim 1 , wherein in the step a), the casing is drifted by a drifting tool.

3. The casing windowing method using coiled tubing according to claim 2 , wherein in the step a), after the casing is drifted, the inner wall of the casing is scraped by a well wall scrape-milling tool.

4. The casing windowing method using coiled tubing according to claim 1 , wherein in the step a), the inner wall of the casing is drifted and scraped by a well wall scrape-milling tool and a drifting tool connected to each other.

5. The casing windowing method using coiled tubing according to claim 3 , wherein the inner wall of the casing is scraped by the well wall scrape-milling tool in a range from 10 m above a window position to 10 m below the window position in the casing.

6. The casing windowing method using coiled tubing according to claim 4 , wherein the inner wall of the casing is scraped by the well wall scrape-milling tool in a range from 10 m above a window position to 10 m below the window position in the casing.

7. The casing windowing method using coiled tubing according to claim 1 , wherein in the step b), the positioning assembly comprises a bottom cap; an upper end of the bottom cap is connected to the hanger; an upper end of the hanger is provided with a connection rod; an upper end of the connection rod, the logging instrument, a motor head, a connector and the coiled tubing are connected in sequence to form a positioning assembly tool string, after being hanged at a predetermined position on the casing, the hanger is separated from the positioning assembly, to raise the positioning assembly tool string, then put the positioning assembly tool string down to a bottom of the hanger, and finally, trips out to determine whether the hanger expands enough to be fixed at the predetermined position on the inner wall of the casing.

8. The casing windowing method using coiled tubing according to claim 7 , wherein in the step b), after the hanger is hanged at the predetermined position on the casing, the connection rod is separated from the hanger.

9. The casing windowing method using coiled tubing according to claim 8 , wherein a middle portion of the hanger is sleeved by a plurality of convex rings and a plurality of seal sleeves interposed between every two convex rings.

10. The casing windowing method using coiled tubing according to claim 1 , wherein in the step c), the guiding assembly comprises a locating sub inserted into the hanger, the inclined end face is formed on an upper end of the locating sub, a locating key slot communicated with the inclined port is provided on the hanger, a locating key that can be inserted into the locating key slot is provided on the locating sub, a locking hole is provided on the hanger.

11. The casing windowing method using coiled tubing according to claim 10 , further comprising step c1) between the step b) and the step c), step c1) comprising: connecting the window inclined plane with the adjusted direction to the locating sub.

12. The casing windowing method using coiled tubing according to claim 11 , wherein the guiding assembly of the whipstock comprises an orientation guide rod and an upper end of the locating sub is connected to the orientation guide rod having the window inclined plane, an upper end of the orientation guide rod is connected to an upper connection rod through a shear pin, and an upper end of the upper connection rod, a bearing sub, a motor head, a connector and the coiled tubing are connected in sequence.

13. The casing windowing method using coiled tubing according to claim 1 , wherein in the step d), an upper end of the tapered windowing mill, a down hole motor, a motor head, a connector and the coiled tubing are connected in sequence.

14. A casing windowing tool using coiled tubing, comprising:
a coiled tubing;
a positioning assembly that can be connected to the coiled tubing, comprising a hanger with an inclined port which can be hanged in a casing;
a logging instrument connected to the positioning assembly and configured to measure and record an orientation of the inclined port of the hanger upon the hanger being hung in the casing; and
a whipstock that can be connected to the coiled tubing, and configured to be aligned relative to the coiled tubing at the surface in response to the recorded orientation of the inclined port of the hanger, comprising a guiding assembly with an inclined end fact that can be fitted with the inclined port which can be inserted into the hanger of the positioning assembly, and an orientation of a window inclined plane of the guiding assembly meets a requirement of window orientation.

15. The casing windowing tool using coiled tubing according to claim 14 , wherein the positioning assembly comprises a bottom cap; an upper end of the bottom cap is connected to the hanger; an upper end of the hanger is provided with a connection rod; an upper end of the connection rod, a logging instrument, a motor head, a connector and the coiled tubing are connected in sequence.

16. The casing windowing tool using coiled tubing according to claim 15 , wherein a middle portion of the hanger is sleeved by a plurality of convex rings and a plurality of seal sleeves interposed between every two convex rings.

17. The casing windowing tool using coiled tubing according to claim 14 , wherein under a state where the inclined end face is aligned with the inclined port, the orientation of the window inclined plane meets the requirement of window orientation.

18. The casing windowi

Assignees

• China Nat Petroleum Corp
• Cnpc Eng Tech Res & Dev Co Ltd

Inventors

• Zhang Yanping
• Li Xuehui
• Wu Qianli
• Yu Yongliang
• Cao Chuan
• Lv Mingjie
• Jia Tao
• Yang Yi

Classifications

• E21B23/01

  for anchoring the tools or the like (E21B23/02 - E21B23/06 take precedence; anchoring of drives in the borehole E21B4/18) · CPC title

• E21B37/02

  Scrapers specially adapted therefor · CPC title

• E21B7/061 Primary

  the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock · CPC title

• E21B17/20 Primary

  Flexible or articulated drilling pipes {, e.g. flexible or articulated rods, pipes or cables} · CPC title

• E21B29/06 Primary

  Cutting windows, e.g. directional window cutters for whipstock operations ({E21B29/005 and} E21B29/08 take precedence) · CPC title