Unlock instant, AI-driven research and patent intelligence for your innovation.

Special buckle oil casing sealing structure

A technology of oil casing and sealing structure, which is applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of limited effect, achieve the effects of reducing processing accuracy, preventing processing errors, and increasing the cost of use

Inactive Publication Date: 2015-08-19
TIANJIN UNIV OF COMMERCE
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of the sealing structure, its effect is very limited

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Special buckle oil casing sealing structure
  • Special buckle oil casing sealing structure
  • Special buckle oil casing sealing structure

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] For the preparation of magnetorheological fluid, simethicone oil, which is resistant to high temperature and insoluble in mechanical oil and water, is used as the base fluid, and the magnetic fluid is Fe with a diameter of about 10nm. 3 o 4 The particle, dispersant (or diffusion agent) adopts linoleic acid liquid, the ratio is 10mL, 10g and 0.1g.

[0028] The sealing structure of magnetorheological fluid is described in detail below:

[0029] 1. The size parameters of the permanent magnet

[0030] The permanent magnet of the present invention adopts the chromium-iron-boron material that is magnetized in the axial direction, and the main dimensions include outer diameter D, axial length L and radial thickness a, the size of the permanent magnet and the maximum magnetic flux density B in the sealing gap g m There is a close relationship, so the size of the permanent magnet should be reasonably designed.

[0031] l) The axial length L of the permanent magnet

[0032] W...

experiment example

[0055] Oil casing material selection 1G r 18N i 9T i , the joint material also chooses the same 1G r 18N i 9T i . The permanent magnet is NdFeB, coercivity H C =935KA / m, each magnetic pole has 3 pole teeth, and the saturation magnetization of magnetorheological fluid is M S =30KA / m, see Table 1 for specific dimensions.

[0056] Table 1 Dimensions of oil casing, permanent magnet and magnetic pole (unit: mm)

[0057]

[0058] Under the conditions listed in Table 1, the sealing performance parameters of the six ferrofluids obtained through experimental testing are shown in Table 2.

[0059] Table 2 Sealing performance parameters of magnetorheological fluid sealing structure

[0060]

[0061] The above-mentioned magnetic fluids 1-6 are all the same magnetorheological fluid, the specific composition is dimethyl silicone oil base fluid, and the magnetic fluid is Fe with a diameter of about 10nm. 3 o 4 Linoleic acid liquid for particles and dispersant, the proportion...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Axial lengthaaaaaaaaaa
Widthaaaaaaaaaa
Coercivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a special buckle oil casing sealing structure. An oil casing is in threaded connection with one end of a coupling, and the oil casing and the other end of the coupling are contacted with an anti-excessive-torque shoulder; an annular gap between the oil casing and the middle part of the coupling is a relief groove. The special buckle oil casing sealing structure is characterized in that the relief groove is equipped with a magnetorheological fluid sealing structure, and the magnetorheological fluid sealing structure is composed of an annular permanent magnet, annular magnetic poles, a magnetic fluid and a magnetic conductive sealing shaft; both ends of the annular permanent magnet are provided with the annular magnetic poles, and the magnetic conductive sealing shaft crosses through the annular permanent magnet and the annular magnetic poles; every annular magnetic pole is provided with at least two pole teeth, and two pole teeth symmetrical to the permanent magnet are formed to be a closed magnetic loop through the permanent magnet; every closed magnetic loop fills into the magnetic fluid. By adopting the magnetorheological fluid sealing form, the special buckle oil casing sealing structure can reduce the using cost of the oil casing and reduce the processing precision of the oil casing.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, and more specifically relates to a special oil casing sealing structure. Background technique [0002] With the development of social economy and the advancement of science and technology, people are increasingly dependent on petroleum energy. This promotes the development and utilization of deep underground oil and gas resources. However, the load of oil casing in deep well service is very complex, requiring it to have sufficient mechanical strength and sealing performance. [0003] Usually, joints are used to connect two oil casings to form a casing string. There are two types of threads that adopt API standards or non-API standards. Non-API standard threads are suitable for deep wells, and non-API standard threads are used for connection. Oil casing is also called special buckle oil casing. [0004] At present, the thread connection structure of special buckle oil casing is as follows...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21B17/08
CPCE21B17/08
Inventor 李连进张海军乔治霞李牧王惠斌张传友宗卫兵王东爱洪林
Owner TIANJIN UNIV OF COMMERCE