Device and method for drilling by using full-automatic composite material continuous pipe

A technology of composite material and coiled tubing, which is applied in drilling drive devices, drilling equipment, and directional drilling in boreholes, and can solve the problems of unsuitable drilling fluids with high compression ratios, large restrictions on the type of screw motors, and shortened service life of coiled tubing, etc. problems, to achieve the effect of increasing controllability and flexibility, light weight, and reducing the number of trips

Inactive Publication Date: 2012-11-21
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In directional drilling operations, in order to control the wellbore trajectory, frequent tripping is required to replace the bottom hole assembly (BHA) and adjust the bending angle of the downhole motor, resulting in premature fatigue failure of the coiled tubing and shortening the service life of the coiled tubing
[0004] Conventional screw and turbine motors widely used in directional drilling use mud pressure as power, which will cause significant pressure drop and affect rock breaking efficiency
The screw motor controls the rotational speed indirectly through the change of the mud fluid. The mud flow rate and circulation pressure must be limited, and the stall phenomenon is unavoidable.
When the screw motor is working, it generates high-frequency vibrations and cannot achieve reverse rotation. In addition, the screw motor is limited by the type of mud and is not suitable for drilling fluids with high compression ratios.

Method used

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  • Device and method for drilling by using full-automatic composite material continuous pipe
  • Device and method for drilling by using full-automatic composite material continuous pipe

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Effect test

Embodiment 1

[0030] Refer to the attached figure 1 And attached figure 2 , the invention discloses an all-electric composite coiled tubing drilling device, the upper end of the drill bit 3 is connected to an electric motor 18 that drives the drill bit 3 to rotate, the invention includes a composite coiled tubing 2 embedded with cables, a coiled tubing drum 8, and a coiled tubing joint 10. A measuring mechanism 15 for measuring downhole parameters, and a steering tool 16 for changing the direction of the drill bit. The composite material coiled tubing 2 is provided with a mud flow channel, and the mud flow channel communicates with the nozzle of the drill bit 3 . The coiled tubing 2 of composite material is wound on the coiled tubing drum 8 , and the lower end of the coiled tubing 2 of composite material is connected with a coiled tubing joint 10 . The continuous pipe joint 10, the measuring mechanism 15, the guide tool 16 and the electric motor 18 are sequentially connected in series. ...

Embodiment 2

[0035] The invention discloses an all-electric composite coiled tubing drilling method:

[0036] In the first step, the coiled tubing 2 made of composite material is used to run the bottom hole assembly including the drill bit 3 , the electric motor 18 , the steering tool 16 , the measurement mechanism 15 and the electric control thruster 14 .

[0037] In the second step, the electric motor 18 is used to drive the drill bit 3 to rotate, and the electronically controlled thruster 14 is used to apply drilling pressure to the drill bit 3;

[0038] In the third step, in the underground, use the measuring mechanism 15 to collect data, and upload the measured data to the ground in real time; receive the control command transmitted from the ground, use the electric motor 18 to change the speed of the drill bit 3, use the guide tool 16 to change the direction of the drill bit 3, and use the electric motor 18 to change the direction of the drill bit 3. Control the thruster 14 to change...

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Abstract

The invention discloses a device and a method for drilling by using a full-automatic composite material continuous pipe and relates to the technical field of drilling in the oil and gas industry. The upper end of a drill is connected with an electric motor driving the drill to rotate, a composite material continuous pipe with an embedded cable is wound on a continuous pipe roller and provided with a mud flow channel, and the lower end of the composite material continuous pipe is connected with a continuous pipe connector. The continuous pipe connector, a measuring mechanism and a steering tool are connected with the electric motor sequentially. A ground power supply is connected with the measuring mechanism, the steering tool and the electric motor through the cable embedded in the composite material continuous pipe. The device and the method achieve transmission of electric power to the underground through the composite material continuous pipe, bi-direction real-time communication between the underground and the ground and drilling through the electric motor. The device and the method can be applied to the fields of underbalanced drilling, deepwater drilling, directional drilling, re-drilling of an old well and drilling of a well containing high sulfur content.

Description

technical field [0001] The invention relates to the technical field of drilling in the petroleum and natural gas industry, in particular to an all-electric composite coiled tubing drilling device and method. Background technique [0002] In coiled tubing drilling, carbon steel coiled tubing has poor adaptability to acidic environments and has high susceptibility to hydrogen sulfide stress corrosion cracking, so it is not suitable for drilling formations containing hydrogen sulfide. Coiled tubes made of metal materials are difficult to achieve wired transmission of power and signals. The transmission rate of mud pulse, electromagnetic wave telemetry and drill pipe acoustic wave transmission technology in the existing downhole wireless data transmission method while drilling (MWD) is much lower than the wired transmission rate. [0003] In directional drilling operations, in order to control the wellbore trajectory, frequent tripping is required to replace the bottom hole ass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B21/00E21B4/04E21B4/18E21B47/00E21B47/12E21B44/00
Inventor 安庆宝尹文波曲刚董怀荣蔡文军郭振曾飞舟
Owner CHINA PETROCHEMICAL CORP
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