An Array Coplanar Coil System for Measuring Vertical Conductivity of Formation

A technology of coplanar coils and electrical conductivity, which is applied in wellbore/well parts, earthwork drilling and production, etc., can solve the problems of high device consistency, complex circuit structure, etc., reduce the negative response area and increase the received signal , The effect of eliminating the impact of wellbore

Inactive Publication Date: 2018-07-27
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first serious problem encountered by the three-component induction logging is that the impact of borehole and mud invasion on the logging response of the coplanar coil system of the tool is more serious and complicated than that of the coaxial coil. This is especially the case when tool eccentricity occurs in mud boreholes. In response to this problem, two foreign logging companies have developed different tools and corresponding data processing methods from different angles.
However, this structure needs to realize the time-sharing work of 16 transmitting circuits, the circuit structure is complex, and the consistency of device selection is high

Method used

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  • An Array Coplanar Coil System for Measuring Vertical Conductivity of Formation
  • An Array Coplanar Coil System for Measuring Vertical Conductivity of Formation
  • An Array Coplanar Coil System for Measuring Vertical Conductivity of Formation

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Embodiment 1

[0047] figure 1 It is a schematic diagram of the layout of the coil system of the present invention.

[0048] An array coplanar coil system for measuring the vertical conductivity of formations is composed of 8 independent 3-coil sub-arrays, and each sub-array includes 1 transmitting coil and 2 receiving coils in the same direction. Eight sub-arrays share one transmit coil. In the figure, T represents the transmitting coil, Indicates the main receiving and secondary receiving coils of the first group of sub-arrays; and so on, there are 8 groups in total. This coil system structure increases the received signal; reduces the influence of the skin effect, and the apparent conductivity is equivalent to that of the coaxial coil system; the negative response area is significantly reduced, and the wellbore influence is approximately linear, and the wellbore correction method based on the database can be used Eliminate wellbore effects.

Embodiment 2

[0050] figure 2 for correspondence figure 1 Schematic diagram of the 3-coil system subarray structure. 2 receiving coils arranged on the same side as the transmitting coil T, and at T and in the middle. At the same time, the position and number of turns of the secondary receiving coil can be adjusted according to the degree of focus of the received signal.

[0051] image 3 is a two-dimensional diagram of the variation of the receiving voltage of the subarray 5 with the number of turns and spacing of the secondary receiving coils. It clearly shows that when it is close to the receiving coil, the receiving voltage increases as the number of turns increases; when it is far away from the receiving coil, the number of turns has little effect on it. When the number of turns is large, the farther away from the transmitting coil, the smaller the receiving voltage; when the number of turns is small, the distance from the receiving coil has little effect on the receiving v...

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Abstract

Provided is an array coplanar coil system for measuring the vertical conductivity of a stratum. A coil system structure of the array coplanar coil system is composed of eight subarrays wound around a non-conductive skeleton. Each subarray is composed of a transmitting coil and two same-direction receiving coils, wherein the normal direction of all the coils coincides with or is parallel to the x axis or the y axis, the winding direction of the two receiving coils is consistent with that of the transmitting coil, the minor receiving coil is located between the transmitting coil and the main receiving coil, the positions of the transmitting coil and the receiving coils are obtained by adopting the duality principle in a two-transmitting and one-receiving subarray structure, and the number of turns is adjusted according to the focusing degree of receiving signals. According to the coplanar coil system, the receiving signals are increased; the skin effect is reduced, negative response zones are obviously reduced, the wellbore effect is approximately linear and can be eliminated through a wellbore correction method based on a database, and therefore the vertical conductivity of the stratum can be accurately acquired.

Description

technical field [0001] The invention relates to the technical field of geophysical well logging, in particular to an array coplanar coil system composed of a plurality of coil systems for measuring the vertical conductivity of formations. Background technique [0002] Different from the conventional induction logging method, the three-component induction logging tool consists of three transmitting and receiving coils perpendicular to each other. The original design idea was to obtain sandstone and shale conductivity by measuring the horizontal conductivity and vertical conductivity of thin alternating layers. In fact, due to the direct measurement of the tensor conductivity of the formation, rich information such as the dip angle and azimuth angle of the formation can also be obtained. The introduction of the three-component array induction logging tool allows people to more accurately understand the three-dimensional characteristics of the formation around the borehole, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 张妙瑜仵杰王武习解茜草赵志峰陈延军
Owner XI'AN PETROLEUM UNIVERSITY
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