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Expansion-type rotatable tail pipe hanger

A liner hanger and hanger technology, which is applied in wellbore/well parts, earthwork drilling, sealing/isolation, etc., can solve the complex structure of slip-type liner hanger, many construction safety hazards, and cementing problems. Quality is difficult to guarantee and other issues, to achieve the effect of improving the success rate of downloading, saving materials, and fewer parts

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, to provide an expandable rotatable liner hanger, which can meet the construction requirements of liner cementing in oil and gas wells, and solve the problems of the slip-type liner hanger with complex structure, Technical problems such as many construction safety hazards and difficult guarantee of cementing quality

Method used

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  • Expansion-type rotatable tail pipe hanger
  • Expansion-type rotatable tail pipe hanger
  • Expansion-type rotatable tail pipe hanger

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0057] As shown in Figure 1, the lifting nipple 1, the central pipe 7 and the rubber plug nipple 8 are sequentially connected in series to form the assembly base of the hanger, wherein the upper end of the central pipe 7 is sleeved on the upper thread 23 on the outer surface. Inside the lower end of the lifting sub-joint 1, the lower end of the center pipe 7 is sleeved inside the upper end of the rubber plug sub-joint 8 through the lower thread 10 on the outer surface; the inner surface of the lower end of the rubber plug sub-joint 8 is designed with a rubber plug thread 9 for connecting Tail pipe rubber plug 40.

[0058] The expansion cone 21, the hanger body 5 and the conversion joint 6 are sequentially sleeved outside the central tube 7 between the lifting sub-joint 1 and the rubber plug sub-joint 8, that is, under the lifting sub-joint 1, the central tube...

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Abstract

The invention provides an expansion-type rotatable tail pipe hanger and belongs to the field of oil gas well fixation. The expansion-type rotatable tail pipe hanger comprises a hanger body and a feeding tool system, wherein the hanger body is an expandable metal tubing, a group of triangle-shaped annular protrusions are formed on the outer surface of an expansion section of the hanger body, annular rubber sections are vulcanized between every two adjacent triangle-shaped annular protrusions, and the diameter of each annular rubber section is larger than the outer diameter of top portion of each triangle-shaped annular protrusion. Rotation of a tail pipe can be realized, tripping-in capability and cement slurry displacement efficiency of the tail pipe are improved, sit-hanging and seal-separating functions of the hanger are realized via a hydraulic expansion hanger body. By the aid of the expansion-type rotatable tail pipe hanger, construction requirements on tail pipe cementation of an oil gas well can be met, and the technical difficulties like complex structure, many potential construction safety hazards and hardness in guaranteeing well cementation quality of a slip-type hanger are overcome. Operation process is simplified, tail pipe cementation quality is improved, risk is reduced, and cost is saved.

Description

technical field [0001] The invention belongs to the field of oil and gas well cementing, in particular to an expandable rotatable liner hanger. Background technique [0002] The liner cementing process is the most commonly used method in deep well cementing. It can save casing and has significant economic benefits; it can simplify the wellbore structure, improve the axial force and load conditions of the pipe string and improve the hydraulic conditions for drilling, especially Significantly reduce the annular flow resistance during construction. At the same time, in the liner cementing construction of ultra-deep wells, extended-reach wells, highly-inclined wells, and horizontal wells, there are technical problems such as difficulty in liner running and low cement slurry replacement efficiency, but the rotary liner hanger can be used. Effectively solve the above-mentioned complex liner cementing technical problems. [0003] Existing rotary liner hangers can be divided into ...

Claims

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Application Information

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IPC IPC(8): E21B23/01E21B33/13
Inventor 郭朝辉马兰荣姚辉前马开华姜向东
Owner CHINA PETROLEUM & CHEM CORP
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