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While-drilling apparent resistivity measuring tool and method

A technology of apparent resistivity and measuring tools, applied in the field of geographic exploration, which can solve the problems of few, difficult to measure apparent resistivity, and low precision.

Active Publication Date: 2019-01-04
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problems of high difficulty in measuring the apparent resistivity and low accuracy existing in the prior art. The present apparent resistivity measuring method is mostly used for well logging after the drilling tool is lifted out of the wellhead, and is rarely used for follow-up. Apparent Resistivity Measurement by Drilling Method

Method used

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  • While-drilling apparent resistivity measuring tool and method

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Embodiment

[0029] The structure design of the resistivity measuring electrode array of the resistivity measuring tool while drilling of the present invention can measure the formation resistivity while drilling downhole. Its resistivity measurement electrode array structure design supports two modes of resistivity imaging measurement during rotary drilling and resistivity imaging measurement during sliding drilling. It is mainly through the design of different emission measurement electrode systems, so that the electrode system pushes the AC current signal into the formation, and at the same time measures the AC current flowing through the formation and returns to reflect the resistivity information of the measured formation around the electrode system. The rotation and sliding of the drilling tool can record the real resistivity information of the drilled formation during the drilling process, and finally form the resistivity image of the logging formation.

[0030] The basic principle ...

Embodiment 2

[0048] When the tool performs rotary drilling downhole, Embodiment 2 can complete the resistivity imaging measurement of the tested formation in the wellbore when the drilling tool is rotated.

[0049] It should be emphasized here that the structures of Embodiment 1 and Embodiment 2 can be used alone or in combination, that is, two sets of structures are installed on the same drill collar.

[0050] According to the formation apparent resistivity imaging formula

[0051]

[0052] It can be seen that the apparent resistivity of the formation is related to the voltage on the metal electrode ring M1 and the current IA0 flowing through the metal electrode A0 (IA0 in formula 4 is Image 6 The current flowing out of the electrode is measured in IC). It is also related to the K coefficient. This K-factor is an electrode coefficient related to the electrode design.

[0053] The electrode coefficient K can be obtained by the following formula

[0054]

[0055] A0M1L, A1M1L, A2...

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Abstract

The invention relates to a while-drilling apparent resistivity measuring tool and method, and belongs to the technical field of geographical detection. The while-drilling apparent resistivity measuring tool and method have the following advantages that the purpose of forcing currents IA0 generated by metal electrodes A0 to be perpendicular to the tool v drill collar surface and go deep into the stratum under testing can be achieved, and resistivity imaging in depth and shallowness measuring ranges can be achieved; on the basis of resistivity imaging of the depth and shallowness ranges, a highvoltage value loaded on a shielded electrode A1 is adjusted to further fine tune the depth of stratum resistivity measuring.

Description

technical field [0001] The invention relates to a tool and method for measuring apparent resistivity while drilling, belonging to the technical field of geographic detection, in particular to a tool and method for measuring apparent resistivity while drilling. Background technique [0002] The resistivity measurement while drilling refers to the continuous measurement of the resistivity information of the downhole wall formation by the drilling rig. [0003] In the drilling process, in order to grasp the lithology of the stratum encountered by the drilling tool, determine the resistivity of the permeable layer and the intrusion zone, determine the thickness of the rock layer, determine the true resistivity of the rock layer and qualitatively judge the oil and gas water layer information, it is necessary to determine the resistance of the formation. rate is measured. The resistivity of different rocks is different, which is mainly determined by the mineral composition of the...

Claims

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Application Information

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IPC IPC(8): E21B47/13
CPCE21B47/125
Inventor 吕海川贾衡天艾维平邓乐窦修荣王鹏毛伟民洪迪峰范锦辉彭浩管康
Owner BC P INC CHINA NAT PETROLEUM CORP