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Method for increasing transmitting efficiency of electromagnetic wave wireless measurement-while-drilling system by aid of multiple insulation short pieces

A wireless measurement-while-drilling and insulating pup technology, which is applied in the directions of measurement, signal transmission system, earthwork drilling and production, etc., can solve the problems of short downhole service time, achieve improved logging depth, strong practicability, and reduce complete failure The effect of probability

Inactive Publication Date: 2015-02-18
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when drilling into low-resistivity formations, in order to receive downhole logging information on the ground, the method of increasing the transmission power of the electromagnetic wave wireless measurement-while-drilling system can be adopted, but it will cause the battery pack to be used downhole after a single full charge. shorter time questions

Method used

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  • Method for increasing transmitting efficiency of electromagnetic wave wireless measurement-while-drilling system by aid of multiple insulation short pieces

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Effect test

Embodiment 1

[0018] Embodiment 1: The method for improving the emission efficiency of the electromagnetic wave wireless measurement-while-drilling system by the multi-insulation pup joint of the present invention is applied in the electromagnetic wave wireless measurement-while-drilling, such as figure 1 As shown, the drill bit 13 is drilled in the well wall 2, and the number of insulating nipples is two. The lowermost insulating nipple 7 is installed between the drill bit 13, the lower drilling tool 12 and the non-magnetic drilling tool 8 containing the probe tube 9. Above; after installing the lowermost insulating nipple 7, an intermediate drilling tool 5 is installed at an interval and then an uppermost insulating nipple 4 is installed; one pole of the excitation source at the transmitting end of the probe tube 8 is connected to the bottom of the lowermost insulating nipple The other end is connected to the upper drilling tool 3 of the uppermost insulating pup 4 through an armored cable ...

Embodiment 2

[0019] ] Embodiment 2: The method for improving the emission efficiency of the electromagnetic wave wireless measurement-while-drilling system by the multi-insulation pup joints of the present invention is applied in the electromagnetic wave wireless measurement-while-drilling system. The structure of the measurement-while-drilling system is the same as that of embodiment 1. The number of insulating short joints is 5, and an intermediate drilling tool 5 is installed between every two adjacent insulating joints, and the distance between the uppermost insulating joint 4 and the lowermost insulating joint 7 does not exceed 300m. By adopting the method of the invention, the emission efficiency of the electromagnetic wave wireless measurement-while-drilling system can be greatly improved.

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Abstract

The invention relates to a method for increasing transmitting efficiency of an electromagnetic wave wireless measurement-while-drilling system by the aid of multiple insulation short pieces. The method includes that two or more insulation short pieces are mounted above a nonmagnetic drill with a probe inside in a well drilling tool combination comprising the measurement-while-drilling system, and the distance between the bottom insulation short piece and the top insulation short piece ranges from 9m to 300m; a pole of a stimulating source of a transmitting end of the probe is connected to a drilling tool under the bottom insulation short piece, and the other end of the probe is connected to a drilling tool on the upper portion of the top insulation short piece via an armored cable; acquired information is processed via a circuit in the probe, is encoded and modulated and is directly transmitted via the transmitting end of the probe; and a receiving device and a grounding electrode are mounted on the ground nearby a derrick and receive signals transmitted by the measurement-while-drilling probe. The problem that large local eddy is formed when the insulation short pieces are located in a low-resistivity stratum can be avoided, so that the transmitting efficiency of the system is improved, simultaneously, the probability that all the insulation short pieces are failed can be avoided to the greatest extent, and transmitting and receiving of the signals are guaranteed.

Description

technical field [0001] The invention relates to a method for improving the emission efficiency of an electromagnetic wave wireless measurement-while-drilling system with multiple insulating short joints, in particular to a method of installing two or more insulating short joints during the measurement-while-drilling process to improve the electromagnetic wave wireless measurement-while-drilling A method for system emission efficiency. Background technique [0002] Electromagnetic measurement while drilling (EM-MWD) is a new technology that entered industrial application in the 1980s. It is less affected by the mud medium and can be used not only for mud drilling, but also for foam and air drilling. In the actual logging process, because the electromagnetic wave is transmitted through the formation, it is greatly affected by the formation resistivity, especially when the formation resistivity is 0-10Ω·m, it has a great influence on the reception of ground signals. Generally,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/01E21B47/13G08C17/02
Inventor 邵春陈鹏飞付信信李田军
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)