A Main-screen Integrated Electrode Structure and Preparation Method of Lateral Electrode System While Drilling
A technology of electrode structure and electrode system, which is applied in the field of main-screen integrated electrode structure and its preparation of lateral electrode system while drilling, to achieve the effect of improving stability and reliability and reducing insulation performance.
Active Publication Date: 2021-03-30
BC P INC CHINA NAT PETROLEUM CORP +1
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[0004] The object of the present invention is to provide a main-screen integrated electrode structure and its preparation method of the lateral electrode system while drilling, which is used to solve the problems of the prior art. The present invention uses the shielding electrode to seal the main electrode structure and the main-screen electrode The equipotential design of the electrode achieves the shielding effect of the instrument, which can overcome the high requirements of the traditional lateral resistivity logging instrument on the insulation performance of the electrode system and the manufacturing process, improve the measurement performance of the deep and shallow lateral resistivity, and meet the oil and gas drilling environment. The need for long-term stable and reliable work
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[0032] The present invention is described in further detail below in conjunction with accompanying drawing:
[0033] The main-screen electrode structure of the traditional lateral resistivity logging tool electrode system is as follows: figure 1 As shown, the disadvantage is that the main electrode A 0 The insulation performance between the drill collar and the drill collar cannot meet the needs of long-term, high-temperature, and high-pressure drilling environments. After the instrument goes downhole, as the performance of the insulation layer declines, the main electrode A 0 Some of the current may pass through the fiberglass material or flow along the wire groove to the drill collar body 1, which will reduce the focusing effect of the main current in lateral resistivity logging, resulting in a low resistivity measurement value. Although oil-filled methods can be used to ensure the insulation performance between the cable lateral resistivity logging electrode and the metal ...
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The invention discloses a while-drilling lateral electrode system main electrode and shielding electrode integrated electrode structure and a preparing method thereof. The structure comprises a drillcollar body. The outer side of the drill collar body is sleeved with a first insulating layer. The outer side of the first insulating layer is sleeved with a shielding electrode. An annular installation groove is formed in the shielding electrode and internally provided with a main electrode. A second insulating layer is arranged between the main electrode and the shielding electrode. A wire penetrating hole for a lead bundle of the main electrode to pass through is formed in the shielding electrode. The high requirements of a traditional lateral electrical resistivity well logging instrumenton the electrode system insulating performance and manufacturing process can be overcome, the measurement performance of depth lateral electrical resistivity is improved, and the requirement for long-term stable and reliable work in an oil and gas drilling environment is met.
Description
technical field [0001] The invention belongs to the field of well logging in oil and gas fields, and in particular relates to a main-screen integrated electrode structure of a lateral electrode system while drilling and a preparation method thereof. Background technique [0002] Lateral resistivity logging while drilling is the earliest logging-while-drilling method realized and applied. The circuit directly supplies current to drill collars and electrodes for focusing. The electrode current type while drilling (not powered by coil induction current) has strong focusing ability and large resistivity measurement range. However, due to the limitation of technology and process level, it has not been mature and widely commercialized so far. The main reasons are: The insulation between the electrode and the drill collar and the wear resistance of the insulating tape of the electrode system cannot meet the needs of the long-term, high-temperature, and high-pressure drilling enviro...
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IPC IPC(8): E21B47/00E21B17/16E21B49/00
CPCE21B17/16E21B47/00E21B49/00
Inventor 杨善森朱军陈鹏黄继贞孙衍刘刚熊焱春吴显李留刘枭
Owner BC P INC CHINA NAT PETROLEUM CORP