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While-drilling lateral resistivity well test system based on C4D technology and signal detection method of while-drilling lateral resistivity well test system

A resistivity logging and drilling-while-drilling technology, which is applied to wellbore/well components, measurement, earthwork drilling and production, etc., can solve problems such as limited work, and achieve the effects of reducing environmental interference, strong applicability, and reducing design

Inactive Publication Date: 2017-04-19
ZHEJIANG UNIV
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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that the traditional lateral resistivity logging while drilling under low frequency is limited in the work of oil-based drilling fluid, based on C 4 D technology, propose a logging signal detection system and method suitable for oil-based drilling fluid at low frequency

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  • While-drilling lateral resistivity well test system based on C4D technology and signal detection method of while-drilling lateral resistivity well test system
  • While-drilling lateral resistivity well test system based on C4D technology and signal detection method of while-drilling lateral resistivity well test system
  • While-drilling lateral resistivity well test system based on C4D technology and signal detection method of while-drilling lateral resistivity well test system

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0031] 1.C 4 DTechnical principle

[0032] figure 1 (a) shows a typical C 4D Two-electrode structure. The sensor is mainly composed of an excitation electrode, a detection electrode and an insulating pipe. The excitation electrode and the detection electrode are metal ring electrodes and are set on the outside of the insulating pipe. The two electrodes, the insulating pipe and the measured conductive liquid form an AC measurement path, and its equivalent circuit diagram is as follows: figure 1 (b) shown. Among them, C 1 and C 2 Represent the coupling capacitance formed by the excitation electrode and the detection electrode through the insulating pipe wall and the conductive liquid in the pipe, and R represents the equivalent resistance of the conductive liquid between the two electrodes in the pipe. When an AC voltage signal is applied to t...

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Abstract

The invention discloses a while-drilling lateral resistivity well test system and a signal detection method based on the capacitively coupled contactless conductivity detection (C4D) technology. The problem that according to traditional while-drilling lateral resistivity well test, measurement under the oil base drilling liquid cannot be achieved is solved. According to the method, an alternating current measurement channel of well test is simplified to and is equivalent to a series connection model of the borehole capacitance and the formation resistivity, the amplitude and the phase position of the well test weak signal are obtained through the digital phase sensitive demodulation technology, and the formation resistivity can be worked out according to related models. A set of while-drilling lateral resistivity well test simulation test device is designed on that base, simulated well test experiments are conducted under the frequencies of 10 kHz, 15 kHz, 20kHz and 25 kHz, researches show that the method is feasible, and the method is suitable for high-resistivity formation while-drilling resistivity well test under the oil base drilling liquid.

Description

technical field [0001] The present invention relates to C 4 D technology and resistivity lateral logging while drilling technology, in particular to a lateral resistivity logging while drilling system under oil-based drilling fluid and a signal detection method thereof. Background technique [0002] The main feature of logging while drilling is to measure while drilling. It completes the logging task while completing the drilling task. Compared with wireline logging, it has the advantages of good real-time performance, real measurement, high efficiency, and good applicability. Resistivity logging while drilling is one of the cores of logging while drilling technology, mainly including induction while drilling, electromagnetic wave while drilling and lateral resistivity logging while drilling. Among them, lateral resistivity logging is a formation resistivity logging method with focused power supply, which has a large resistivity measurement range and is especially suitable ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/12
CPCE21B47/12E21B49/00
Inventor 王保良孙宏博冀海峰黄志尧李海青
Owner ZHEJIANG UNIV
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