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Gas-tight special threaded fittings for low pressure

A special thread and threaded joint technology, applied in drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems of shackle operation and slow make-up, unable to meet the economic and effective development of gas fields, etc., and achieve fast make-up and fast make-up. Easy make-up, make-up and shackle effect

Active Publication Date: 2015-12-02
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

[0004] First, a special threaded joint casing with a shoulder and a sealing surface is used. Since the processing cost of this special threaded joint is more than twice that of the API (American Petroleum Association, American Petroleum Institute) thread, the cost of the pipe string cannot meet the requirements of the above-mentioned gas fields. cost-effective development of
[0005] Second, after make-up with API medium long round thread joint and special thread compound (Catts101), it is impossible to perform breakout operation and make-up speed is slow

Method used

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  • Gas-tight special threaded fittings for low pressure
  • Gas-tight special threaded fittings for low pressure
  • Gas-tight special threaded fittings for low pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , a special threaded joint for low-pressure air-tightness according to Embodiment 1 of the present invention, said threaded joint is an externally threaded joint, the angle of bearing surface of said externally threaded joint is α=3°~30°, and the angle of guide surface β= 30°~45°, tooth top arc radius R=0.38mm~0.42mm, alveolar width B1=1.3mm~1.5mm, tooth ridge width B2=1.6mm~1.8mm, tooth height H=1.9mm~2.2mm , The pitch N is 6 to 8 teeth per inch.

[0028] During specific implementation, the special threaded casing of different specifications can be selected according to the requirements of specific working conditions. The same processing technology as API thread is used in manufacturing. Among them, the coupling and the pipe body are of the same steel grade or a higher steel grade. When making up, both ends are evenly coated with API thread grease, and the middle part of the coupling is clamped. The factory side is made up with the maximum torque, and th...

Embodiment 2

[0032] see figure 1 , a special threaded joint for low pressure air-tightness according to Embodiment 2 of the present invention, the threaded joint is an internal threaded joint, the bearing surface angle of the internal threaded joint is α=3°~30°, and the guide surface angle β= 30°~45°, tooth bottom arc radius R=0.38mm~0.42mm, alveolar width B1=1.3mm~1.5mm, tooth ridge width B2=1.6mm~1.8mm, tooth height H=1.9mm~2.2mm , the pitch N is 6 teeth per inch to 8 teeth per inch, see figure 2 , The internal thread variable taper O is 67mm / m~73mm / m.

[0033] During specific implementation, the special threaded casing of different specifications can be selected according to the requirements of specific working conditions. The same processing technology as API thread is used in manufacturing. Among them, the coupling and the pipe body are of the same steel grade or a higher steel grade, the phosphating thickness of the internal thread is ≥ 20um, API thread grease is evenly applied t...

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PUM

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Abstract

The invention discloses a low pressure gas seal special screwed joint, and belongs to the field of oil development. The bearing surface angle alpha of the screwed joint is 3-30 degrees, the guiding surface angle beta is 30-45 degrees, the tooth crest (bottom) arc radius R is 0.38-0.42mm, the tooth socket width B1 is 1.3-1.5mm, the tooth ridge width B2 is 1.6-1.8mm, the tooth height is 1.9-2.2mm, and the screw pitch N is 6-8 teeth per inch. The economic gas seal special screwed joint can be quickly screwed on and bear large bending load and tensile load, and completely meets a requirement for economic and high-efficiency development of low pressure low permeability gas field.

Description

technical field [0001] The invention relates to a threaded joint, in particular to a special threaded joint for low-pressure gas sealing. Background technique [0002] China has a large area of ​​low-pressure gas fields, especially some gas fields in western China have obvious characteristics of low pressure and low permeability. Low-pressure (reservoir pressure is less than 35MPa), low-permeability lithological trap gas reservoirs, single well production is low, effective development of this gas field can only be achieved by drilling more wells, and casings account for a large proportion of well construction, so choosing to meet low-pressure gas fields is cheap A threaded joint that can also achieve airtightness is an effective measure to reduce development costs. [0003] At present, there are usually two kinds of special thread structures. [0004] First, a special threaded joint casing with a shoulder and a sealing surface is used. Since the processing cost of this spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/08
Inventor 王建东杨力能冯耀荣秦长毅杨龙宋生印易晓明刘文红
Owner BC P INC CHINA NAT PETROLEUM CORP
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