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Cross-well electromagnetism logging instrument emitter and emitting antenna thereof

An electromagnetic logging and transmitting antenna technology, applied in the field of oil and gas exploration, can solve the problems of not being able to meet the needs of use, the radial detection range is small, and the power loss of the antenna is large, so as to achieve good electromagnetic shielding effect and avoid multi-point contact. , reduce the effect of distributed capacitance

Active Publication Date: 2015-06-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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Problems solved by technology

[0002] With the development of exploration technology, determining the connectivity of formation sand bodies, finding missing oil layers, monitoring macroscopic displacement effects, designing infill wells, and improving the accuracy of reservoir simulation have become the key tasks in the middle

Method used

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  • Cross-well electromagnetism logging instrument emitter and emitting antenna thereof
  • Cross-well electromagnetism logging instrument emitter and emitting antenna thereof
  • Cross-well electromagnetism logging instrument emitter and emitting antenna thereof

Examples

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Example Embodiment

[0030] The present invention will be further described in detail below in conjunction with specific embodiments, which are to explain rather than limit the present invention.

[0031] The transmitter of the cross-well electromagnetic logging tool of the present invention, such as figure 2 As shown, it includes an upper sealing body 1, a transmitting antenna 2, a glass fiber reinforced plastic housing 3, a pre-tightening device 4, a lower sealing body 5 and a balance system; among them, the upper sealing body 1 and the lower sealing body 5 are used to seal the balance inside the oil cavity of the system Oil, the transmitting antenna 2 is the core component of the transmitter of the cross-well electromagnetic logging tool. It is used to wind the transmitting coil. The glass fiber reinforced plastic shell 3 is used to protect the transmitting antenna 2 and to ensure that the transmitting antenna is isolated from the external environment and the upper sealing body 1. The lower sealin...

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Abstract

The invention provides a cross-well electromagnetism logging instrument emitter which is strong in stability, high in emitting efficiency and strong in quality factor of an emitting antenna and the emitting antenna thereof. The emitting antenna comprises an antenna assembly arranged in a fiberglass shell of the emitter, and the antenna assembly comprises a magnetic core, a mandrel arranged inside the magnetic core in a penetrated mode, an antenna framework which covers outside the magnetic core and an emitting coil and an alignment coil which are winded on the antenna framework in a sectional mode; the magnetic core is fastened in the antenna framework through a magnetic core upper fixing sleeve and a magnetic core lower fixing sleeve which are arranged at the two ends of the magnetic core; the emitting coil and the alignment coil are both winded on the antenna framework through multiple strands of silvering paint lapping monolayers in a symmetric mode. The emitter comprises the fiberglass shell, the emitting antenna of any scheme which is arranged inside the fiberglass shell and an upper sealing body and a lower sealing body which are arranged at the two ends of the fiberglass shell; a pretension device is arranged between the lower sealing body and the emitting antenna, and a balance system is arranged at the free end of the lower sealing body.

Description

technical field [0001] The invention relates to oil and gas exploration technology, in particular to an interwell electromagnetic logging instrument transmitter and its transmitting antenna. Background technique [0002] With the development of exploration technology, determining the connectivity of formation sand bodies, finding missing oil layers, monitoring macroscopic displacement effects, designing infill wells, and improving the accuracy of reservoir simulation have become the key tasks in the middle and late stages of oilfield development. The cross-well electromagnetic logging instrument used in the project has poor reliability, large antenna power loss, small radial detection range, and complicated construction process, which can no longer meet the requirements of the above-mentioned applications. [0003] Interwell electromagnetic logging is to measure the resistivity distribution between wellbores, and it is an important frontier in the development of contemporary...

Claims

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Application Information

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IPC IPC(8): H01Q7/08H01Q1/22E21B49/00
Inventor 党峰陈涛侯学理王水航李玉宁冯志勇张春丽张培军
Owner BC P INC CHINA NAT PETROLEUM CORP
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