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
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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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