Continuous casing running operation circulation device and method

A technology of circulation device and casing, applied in drilling equipment and methods, earthwork drilling, drilling equipment, etc., can solve problems such as no effective technical countermeasures, non-existence, etc., and achieve enhanced sealing, good effect, and sealing powerful effect

Active Publication Date: 2016-12-14
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

[0007] In the above three technical solutions, if the drilling fluid needs to be circulated midway due to problems such as wellbore necking, block loss, and lost circulation, the actual hollowing out of the casing string will no longer exist, and the load of the casing string will be greater than the maximum load of the drilling rig. No effective technical countermeasures

Method used

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  • Continuous casing running operation circulation device and method

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Experimental program
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Effect test

Embodiment 1

[0033] In order to overcome problems such as wellbore necking, block loss, and lost circulation, when the drilling fluid needs to be circulated, the actual hollowing out of the casing string does not exist, and the load of the casing string will be greater than the maximum load of the drilling rig. The present invention provides such as figure 1 Shown is a continuous circulation device and method for casing running operation. In the process of hollowing out and running the casing, the present invention can circulate halfway, but will not completely fill the inside of the casing with drilling fluid. The casing can be circulated while running downhole without increasing the actual load of the casing string.

[0034] A continuous circulation device for casing operation, including a wellbore 2 and a casing 3, the casing 3 is connected with the lower end of the special nipple 8 and the floating hoop 9 to form a casing string, and the casing string is located in the well Inside the ...

Embodiment 2

[0038] Based on Embodiment 1, in this embodiment, the lower end of the packer 6 is provided with a nozzle 7 .

[0039] The packer 6 is a rubber bucket packer.

[0040] The internal diameter of the special short joint 8 is 2 mm larger than that of the conventional casing, and its smoothness reaches 7.

[0041] The characteristic short joint 8 has a length of 1-1.5m.

[0042] The casing 3 has an outer diameter of 244.5 mm; the continuous tube 4 has an outer diameter of 62 mm.

[0043] The packer 6 adopted in the present invention is a rubber barrel type, and the rubber barrel type packer 6 can effectively perform setting, has good setting effect and strong sealing performance. The special pup 8 also used is to grind and polish the inner wall of the conventional pup, so that the glossiness of the inner wall of the pup reaches 7, so that when the packer 6 is set, the surface tension of the pup prepared in this way becomes larger and equal to The sealability of the contact surfa...

Embodiment 3

[0046] Based on the above-mentioned embodiments, this embodiment provides a continuous cycle method for running casing operations, and the specific steps are:

[0047] Step 1 Run the casing 3, the special nipple 8 and the floating hoop 9 into the wellbore 2 in order to form a string of casings, and place the casing 3 on the wellhead 1;

[0048] Step 2 Connect coiled tubing 4, one-way valve 5 and packer 6 in sequence, fill the connected coiled tubing 4 with circulating fluid, and run it into casing 3 at wellhead 1;

[0049] Step 3: Lower the packer 6 in step 2 to the special sub-joint 8 in step 1 and start the pump cycle;

[0050] Step 4 After completing the circulation, close the circulation pump, and lift the coiled tubing 4 out of the wellhead 1;

[0051] Step 5 After the cycle is completed, continue to run casing 3;

[0052] Step 6 In the subsequent casing running 3 process, when the cycle is performed, the above steps are repeated until the operation is completed.

[00...

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Abstract

The invention provides a continuous casing running operation circulation device which comprises a borehole and a casing. The casing, a special nipple and a float collar form a casing string, the lower ends of the special nipple and the float collar are sequentially connected, the casing string is positioned in the borehole, a continuous tube is arranged in the casing, a packer is connected at the lower end of the continuous tube and positioned in the special nipple, a one-way valve is arranged between the packer and the continuous tube, and an inner cavity of the special nipple is (good in smooth finish and sealing effect). When a pump is started to circulate on the ground, well drilling liquid reaches a well bottom through the continuous tube, the one-way valve and the packer and returns to a well mouth from an annular space between the borehole and the casing, so that underground circulation is finished, the device can realize halfway circulation, the inside of the casing cannot be completely filled with the well drilling liquid, and the actual load of the casing string cannot be increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling engineering, in particular to a continuous circulation device and method for casing running operation. Background technique [0002] In recent years, more and more deep wells have been drilled in Changqing Oilfield, and the weight of the large-size casing strings run in is getting heavier and heavier, causing the casing load to approach or exceed the maximum safe load of the selected drilling rig. Currently, in the drilling design Drilling rigs of corresponding specifications are selected according to SY / T6724-2008 "Basic Configuration Standards for Petroleum Drilling Rigs and Workover Rigs". However, in actual work, due to the large load of the large casing string, it often exceeds the selection standard of the drilling rig (such as ZJ50) by 20-30 tons. If the design standard should be replaced with a larger drilling rig (such as ZJ70), it will cause unnecessary Waste brings g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/20
CPCE21B7/20
Inventor 杨博孙亚莉
Owner BC P INC CHINA NAT PETROLEUM CORP
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