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Electromagnetic wave resistivity logging-while-drilling tool

A logging-while-drilling tool and resistivity technology, which is applied in the field of drilling, can solve the problems of complex manufacturing process and high process requirements, and achieve the effects of simplifying the manufacturing process, simplifying the process flow, and being easy to expand

Active Publication Date: 2015-03-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This structure has problems such as high technical requirements and complicated manufacturing process.

Method used

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  • Electromagnetic wave resistivity logging-while-drilling tool
  • Electromagnetic wave resistivity logging-while-drilling tool
  • Electromagnetic wave resistivity logging-while-drilling tool

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] see Figure 1 to Figure 4 , an electromagnetic wave resistivity logging while drilling tool of the present invention, comprising an outer collar 1 and an inner collar 8 arranged in the outer collar 1, the positioning hole on the outer collar 1 and the positioning anti-rotation are passed between the outer collar 1 and the inner collar 8 The pin 4 is radially fixed, and the outer collar 1 and the inner collar 8 are assembled to form a sealed ring cavity; wherein, the two ends of the inner collar 8 are respectively provided with a locking ring 2 and a mud diversion sleeve 3, and the locking ring 2 is set in the inner collar 8, and the inner collar 8 is fixed by connecting the ACME thread 6 with the outer collar 1. The mud diversion sleeve 3 is set on the outer collar 1 and fixed radially with the outer collar 1 by screws. The mud diversion sleeve 3 is us...

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Abstract

The invention discloses an electromagnetic wave resistivity logging-while-drilling tool, and belongs to the technical field of well drilling. The electromagnetic wave resistivity logging-while-drilling tool comprises an outer collar, an inner collar, a locking ring, a mud guiding sleeve, a positioning anti-rotation pin and the like. The symmetrical structure with four transmitting coils and two receiving coils is adopted for the tool, wherein the two pairs of transmitting coils are located at the two ends of the receiving coils respectively. Electromagnetic waves generated by the transmitting coils arrive at the receiving coils in the middle through stratums; due to the fact that the electrical conductivities of the stratums are different, phase differences and amplitude differences happen to the positions where the electromagnetic waves arrive at the receiving coils. Different phase differences and different amplitude differences happen to different stratums, and therefore the characteristics of the stratums can be distinguished. In addition, the optimal well compensation can be achieved through the symmetrical antenna structural design. The problem of the design of an axial passageway of the logging-while-drilling electromagnetic tool is solved, the manufacturing process is simplified, and the subsequent repair and maintenance of the tool are facilitated.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to an electromagnetic wave resistivity logging-while-drilling tool. Background technique [0002] Among petroleum LWD tools, the electromagnetic wave resistivity logging tool can obtain more formation information, identify complex oil and gas layers with industrial exploitation value, improve the depth of instrument detection and the ability to identify thin layers. It also has unique advantages in anisotropic formation and formation imaging. [0003] At present, this type of instrument mostly adopts double-transmitter and double-receive, four-transmitter and double-receive or more coil structures. With the increase of electromagnetic wave instrument coils, in order to realize the electrical communication between the transmitting and receiving antennas, the mechanical structure of the axial channel of the instrument has become the key point of the instrument design. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 卫一多陈鹏张维罗正国王珺朱军徐韧闫麦奎张健阁桑泉闫璟逸周彦张甜甜尤佳琪和丽真
Owner BC P INC CHINA NAT PETROLEUM CORP
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