An anti-wear insulating pup joint for electromagnetic wave measurement while drilling

A technology of measuring while drilling and insulating pup joints, which is applied in construction and other directions, can solve the problems of time-consuming and labor-intensive removal, and achieve the effects of simple repair work, prolonging service life and reducing damage

Inactive Publication Date: 2016-03-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the insulation material has strong adhesion, and it is also a time-consuming and labor-intensive task to completely remove it.

Method used

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  • An anti-wear insulating pup joint for electromagnetic wave measurement while drilling
  • An anti-wear insulating pup joint for electromagnetic wave measurement while drilling
  • An anti-wear insulating pup joint for electromagnetic wave measurement while drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The present invention provides an electromagnetic wave measurement while drilling an anti-wear insulating pup joint, the structure of which is as follows figure 1 , 2 and image 3 As shown, it includes pup body 1, protection joint 2 and anti-wear joint 3. The pup body, protection joint and anti-wear joint are all provided with a central through hole; the pup body, protection joint and anti-wear joint are all made of Made of 45 steel, the wear-resistant insulating pup joint is centered on the pup joint body 1, and the two ends are respectively connected to the protection joint 2 and the wear-resistant joint 3 symmetrically through threads.

[0024] The length of the short joint body 1 is 765 mm, the outer diameter of the protective tape 5 is 175 mm, the outer diameter of the insulating tape 4 is 159 mm, the inner diameter of the short joint body is 89 mm, and the outer surface of the short joint body 1 is evenly divided into interval Insulating tape 4, th...

Embodiment 2

[0027] Embodiment 2: The present invention provides an electromagnetic wave measurement while drilling an anti-wear insulating pup joint. Its structure is the same as that of Embodiment 1, except that the dimensions of each component change. In this embodiment, the short joint body 1 has a length of 530mm, the outer diameter of the protective tape 5 is 103mm, the outer diameter of the insulating tape is 89mm, the depth of the groove is 8.5mm, the inner diameter of the short joint body is 69mm, the width of the insulating tape at both ends is 50mm, and each annular insulation in the middle section The belt width is 20mm, and the width of each annular protective belt is 10mm. The flexible ceramics are CeRam-Kote2000. The thickness of the flexible ceramic insulating layer on the surface of the insulating tape is 1mm, and the thickness of the glass fiber reinforced plastic insulating layer is 2mm; mm, and the thickness of the flexible ceramic layer on the threaded surface at both ...

Embodiment 3

[0029]Embodiment 3: The present invention provides an electromagnetic wave measurement while drilling an anti-wear insulating sub. Its structure and the flexible ceramic used are the same as in Embodiment 2, except that the length of the insulating sub body 1 of this embodiment is 465 mm, and the outer diameter of the protective tape 5 is The outer diameter of the insulating tape is 81.6mm, the outer diameter of the insulating tape is 73mm, the depth of the groove is 4mm, the inner diameter of the pup joint body is 53mm, the width of the insulating tape at both ends is 40mm, the width of each annular intermediate insulating tape is 15mm, and the width of each annular protective tape is 5mm. The thickness of the flexible ceramic insulating layer with surface is 0.2mm, the thickness of the FRP insulating layer is 1mm; the thickness of the flexible ceramic layer on the threaded surface of the pup joint body is 0.2mm, and the thickness of the flexible ceramic layer on the inner surf...

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PUM

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Abstract

The invention relates to an anti-wear insulation pipe nipple for electromagnetic wave measurement while drilling. The structures of the anti-wear insulation pipe nipple are as follows: a pipe nipple body is taken as a center, and two ends of the pipe nipple body are symmetrically connected to a protection joint and an anti-wear joint through a screw thread in sequence; insulation tapes with the equal width and protection tapes with the equal width and height are uniformly distributed at the middle section of the outer surface of the pipe nipple body at intervals, flexible ceramic is sprayed on the lateral end face of a position, which is located at a junction with the screw thread, in the pipe nipple body, the inner surface of a through hole at the center and the surface of the screw thread; the insulation tapes take the flexible ceramic and glass steel cloth as insulation layers, hard alloy teeth are embedded in the surfaces of the protection tapes, and the outer diameter of the hard alloy teeth is greater than the outer diameter of the insulation tapes; the protection joint and the insulation tapes of the pipe nipple body have the same outer diameter; the outer diameter of the surface of the anti-wear joint is greater than that of the protection tapes, the anti-wear joint is a small spiral centralizer, and the outer diameter of the surface of the anti-wear joint is smaller than that of the surface of the regular spiral centralizer. According to the structure, direct collision or friction of the pipe nipple body and a well wall can be reduced, and the repair of the insulation layers is simpler. The anti-wear insulation pipe nipple for electromagnetic wave measurement while drilling has the advantages of long service life and capability of reducing well drilling cost.

Description

technical field [0001] The invention relates to an anti-wear insulating short joint for electromagnetic wave measurement while drilling. Background technique [0002] Electromagnetic wave measurement while drilling (EM-MWD) is a new drilling technology, which has the advantages of high signal transmission speed, data transmission without circulating drilling fluid, short measurement time and low cost. The insulating sub is an important part of the electromagnetic wave measurement while drilling system. The insulating sub is connected to the drill string. Its main function is to divide the drill string into two non-conductive sections, so that the electromagnetic signal mainly passes through the formation. detected by ground receivers. [0003] Foreign countries have been relatively successful in the development of insulating pup joints. The main body of the insulating pup joints they developed are all made of insulating materials. They have been used in actual drilling oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/13
Inventor 邵春徐林沈传波李田军
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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