Signal processing device for range finding radar for drilling detecting layers of horizontal wells
A signal processing device and ranging radar technology, applied in the field of geological exploration, can solve the problems of low transmission rate, unable to meet the sampling and processing requirements of the radar system, and very high real-time requirements
Active Publication Date: 2015-07-15
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology
[0006] However, considering factors such as economy and practicability, the transmission mode of downhole measurement data currently adopted at home and abroad is generally wireless transmission mode, relying on mud pulses and low-frequency electromagnetic waves, etc., and the transmission speed of data is relatively slow, only a few Hz to more than a dozen Hz
In the system design, the amount of data transmitted by the radar is very large, and the system has very high requirements for real-time performance. Such a low transmission rate cannot meet the sampling and processing requirements of the radar system, and it is impossible to transmit the data to the ground for processing on the ground host.
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[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0020] Such as figure 1 As shown, the receiving antenna 1 receives the weak electromagnetic wave echo signal generated by the interface between the reservoir and the caprock, and uses the small signal amplifier 2 to pre-amplify the received weak electromagnetic wave signal; the rotation angle detection unit detects that the plane where the antenna is located is directly above or directly below, that is, when the angle between the horizontal plane of the antenn...
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The invention discloses a signal processing device for range finding radar for drilling detecting layers of horizontal wells. The signal processing device can acquire and process high-frequency electromagnetic signals in real time in an underground drilling procedure, time-domain and frequency-domain feature information of echo signals which are acquired after the high-frequency electromagnetic signals are processed can be subjected to correlation solving, distances from a tool face to the top and the bottom of a reservoir can be computed, and data of the computed distances further can be transmitted to the ground via a wireless electromagnetic signal channel by the aid of an insulating dipole transmitting unit. The signal processing device is mainly applicable to detecting thicknesses of oil layers, coal beds and other reservoirs in drilling procedures, the received high-frequency electromagnetic signals are sampled and processed in real time in the drilling procedure, and accordingly the signal processing device implements one of core technologies of the range finding radar for the drilling detecting layers of the horizontal wells.
Description
technical field [0001] The invention belongs to the field of geological exploration, and in particular relates to a signal processing device for a horizontal well drilling layer ranging radar. Background technique [0002] With the continuous development of the petroleum industry and the increasing difficulty of oil and gas exploration and development, the oil exploration and development industry has gradually turned to the development of oil and gas reservoirs with small scale, thin oil and gas layers, poor physical properties and strong heterogeneity, directional wells, horizontal wells, etc. The application of special process wells is increasing year by year. During the construction of these special craft wells, it is necessary to grasp the characteristics of the rock formation drilled by the drill bit in time, quickly and accurately find the reservoir, so as to guide the construction personnel to control the drill bit to always pass through the reservoir, so as to maximi...
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IPC IPC(8): E21B47/00G01S7/02
Inventor 滕鑫淼盛利民李林窦修荣张明宝石荣
Owner BC P INC CHINA NAT PETROLEUM CORP