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Full-path floating casing installation tool

A full-bore and casing technology, applied in the direction of casing, drill pipe, drilling equipment, etc., can solve problems such as the difficulty of running casing in extended-reach wells, and achieve the goal of improving cementing quality, increasing buoyancy, and avoiding contact Effect

Pending Publication Date: 2020-09-15
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of difficulty in casing running in extended-reach wells, and proposes a full-bore floating casing running tool, which can seal a section of air in the casing when the casing is running, and improve the pressure on the casing. Buoyancy, reduce the pressure of the casing on the wellbore, reduce the friction resistance of casing running, reduce the difficulty of casing operation, and improve the success rate and quality level of casing operation

Method used

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  • Full-path floating casing installation tool
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  • Full-path floating casing installation tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A full bore floating casing running tool, mainly composed of a well retaining sleeve and a drillable inner core;

[0027] The well retaining sleeve part is mainly composed of an upper sleeve 1, a soluble liner 9 and a lower sleeve 13, and the soluble liner 9 is close to the inner wall of the well retaining sleeve;

[0028] The drillable inner core is mainly composed of a sealing rubber umbrella 2, a rubber umbrella skeleton 3, an opening plug 6, and a guide sleeve 12; wherein, the guide sleeve 12 is in a cylindrical structure, and its outer wall is opposite to the lower part of the soluble inner lining 9 Fixed; the opening plug 6 has a "T"-shaped cylindrical structure, and the lower part of the reduced-diameter section is provided with a blind hole in the axial direction, and forms an axial sliding seal fit with the guide sleeve 12, and a circulation hole is provided in the upper circumferential direction of the blind hole at the lower end, and the circulation The hole ...

Embodiment 2

[0030] On the basis of above-mentioned embodiment 1, further include:

[0031] The sealing rubber umbrella 2 is vulcanized on the outside of the rubber umbrella frame 3 to form a tail rubber plug assembly.

[0032] The opening plug 6 is fixed on the soluble liner 9 by upper shear pins 8 .

[0033] The guide sleeve 12 is fixed on the soluble lining 9 through the lower shear nails 10 .

[0034] The minimum inner diameter of the dissolvable liner 9 is smaller than the inner diameter of the casing, and the minimum inner diameter of the well-staying casing after complete dissolution is not smaller than the inner diameter of the casing.

[0035] The axial sliding matching stroke of the opening plug 6 and the guide sleeve 12 satisfies that the diversion hole of the opening plug 6 is at the bottom end of the guide sleeve 12 where the diameter is enlarged at the dead center of the downstroke.

[0036] The lower end of the guide sleeve 12 is expanded in diameter, and forms a gap or in...

Embodiment 3

[0039] A full-bore floating casing tool is composed of two parts: a well-staying sleeve and a drillable inner core;

[0040] The well retaining sleeve part is mainly composed of upper sleeve 1, sealing structure 4, sealing structure 7, soluble liner 9, lower sleeve 13 and other parts, such as Figure 4 shown;

[0041] The drillable inner core is mainly composed of sealing rubber umbrella 2, rubber umbrella skeleton 3, sealing structure 5, opening plug 6, upper shear nail 8, lower shear nail 10, sealing structure 11, guide sleeve 12, etc., such as image 3 shown.

[0042] The function of the retaining sleeve part is to connect the casing and fix the drillable inner core part; the function of the drillable inner core part is to isolate the air section and the liquid section in the casing and carry the weight of the liquid section.

[0043] The upper part of the upper sleeve 1 of the well retaining sleeve part has a casing button for connecting with the casing. The lower part o...

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Abstract

The invention relates to a full-path floating casing installation tool. The full-path floating casing installation tool mainly comprises a well retaining sleeve and a drillable inner core; the well retaining sleeve part mainly comprises an upper sleeve, a soluble lining and a lower sleeve, and the soluble lining is tightly attached to the inner wall of the well retaining sleeve; and the drillableinner core mainly comprises a sealing rubber umbrella, a rubber umbrella framework, an opening plug and a guide sleeve. The full-path floating casing installation tool has the main functions of sealing a section of air or light liquid in a well completion tubular column, improving the buoyancy of the well section, reducing the pressure of the well completion tubular column on the lower well wall,reducing the frictional resistance and reducing the frictional resistance when the well completion tubular column is lowered, thereby improving the success rate of casing installation operation of a large-displacement well. According to the tool, the structure of the tool is optimized, the minimum inner diameter of the well retaining sleeve part of the tool is consistent with the inner diameter ofa sleeve pipe, and adverse effects on later operation are avoided.

Description

technical field [0001] The invention relates to a well completion tool, in particular to an auxiliary casing running tool used in extended-reach wells, which can reduce the friction resistance of casing running and improve the success rate of casing running. Background technique [0002] Extended-reach wells are an important means of developing oil and gas resources in complex terrain, such as offshore, lake, and mountainous oil and gas resources. When developing oil and gas resources in these areas, the location of the wells is limited. Usually, the distance between the wellhead and the target point is There is a large horizontal distance between them, and extended-reach wells need to be developed. [0003] However, when the extended reach well is completed, due to the large horizontal displacement, the friction force of the completion pipe string lying on the lower well wall is relatively large, and it is difficult to run the completion pipe string into place. At the same ...

Claims

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Application Information

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IPC IPC(8): E21B17/08E21B7/20E21B23/01
CPCE21B7/20E21B17/08E21B23/01
Inventor 董恩博刘东清谭化新肖经纬马德材饶鸿飞陶剑赵文英曹成章王立伟邵茹任丽华赵勇张建国李国锋李伟
Owner SINOPEC SSC