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Transient electromagnetic logging instrument

A transient electromagnetic logging and instrument technology, which is applied in the directions of measurement, borehole/well components, earthwork drilling and production, etc., can solve the problems of harsh logging conditions and large influence of measurement conditions on measurement results, and achieve the effect of increasing excitation intensity

Active Publication Date: 2014-02-26
CHINA PETROCHEMICAL CORP +2
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  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to propose a transient electromagnetic system that adapts to complex well conditions and improves logging resolution and detection depth in view of the harsh logging conditions in the prior art and the measurement results are greatly affected by the measurement conditions. Logging instrument

Method used

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Embodiment 1

[0026] see figure 1 , an electromagnetic induction through-casing resistivity logging tool, including a cable joint 1, an upper centralizer 2, a stainless steel shell 3, a lower centralizer 9, and the like. Inside the stainless steel shell 3 are circuit modules 5, natural gamma ray probes 4, electromagnetic probe systems 6, well temperature modules 7, and the like. The circuit module 5 is a system composed of a digital signal processor (CPU) as the core. The well temperature module 7 is connected with a well temperature sensor 8 .

[0027] see figure 2 , the circuit implementation of the instrument is composed of different functional modules, namely: power supply voltage stabilization, PWM modulation, power conversion, forward and reverse transmission control of the transmitting coil, communication modulation, receiving signal transmission processing of the receiving coil, channel acquisition and AD conversion , Gamma detection module, temperature detection module, digital...

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Abstract

The invention relates to a transient electromagnetic logging instrument which comprises a shell, a circuit module and an electromagnetic probe system, wherein the circuit module is arranged in the shell, and the electromagnetic probe system is connected with the circuit module. The circuit module is sequentially connected with a power voltage regulator module, a PWM (pulse width modulation) module, a high-power isolating transformer bank and a power conversion module through a direct-current power supply to form a direct-current power supply circuit and a main control circuit taking a digital signal processor as a core, and a communication bus, a power bus, a control bus and a data bus are arranged on the periphery of the main control circuit. The electromagnetic probe system comprises a transmitting coil and a plurality of receiving coils, wherein the transmitting coil is provided with a magnetic core. The instrument detects casing damage and effectively measures the formation resistivity of an open hole well and a cased well in a non-contact mode. High-power transient excitation is realized by the aid of internal iron cores of the coils, the excitation intensity of a transient electromagnetic field is improved, and the formation resistivity is finally obtained by necessarily graduating and processing measured original signals.

Description

technical field [0001] The invention relates to a transient electromagnetic well logging instrument, which belongs to the technical field of casing quality detection for open-hole and cased wells and special instruments for measuring the formation resistivity of open-hole and cased wells in petroleum well logging construction, in particular to a pair of casing It can effectively detect pipe damage, and can effectively measure the formation resistivity parameters of open hole and cased hole. Background technique [0002] In the process of petroleum exploration and development, the measurement of formation resistivity is an important parameter for evaluating oil saturation. Especially in cased wells, measuring formation resistivity is of great significance to understanding the distribution of remaining oil. In the prior art, the casing damage detection adopts the magnetic flux measurement method, the open hole resistivity logging has double induction, array induction and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00
Inventor 臧德福沈建国董经利朱留方刘树勤张付明张守伟刘增管林华
Owner CHINA PETROCHEMICAL CORP
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