Near-bit constant power wireless short transmission method and device
A technology with constant power and close to the drill bit, which is applied in the fields of earthwork drilling, surveying, and instruments. It can solve the problems of difficult mechanical processing, poor signal-to-noise ratio of received signals, complex processing and installation, etc., and achieves easy processing and on-site operation, Effects of improved amplitude and signal-to-noise ratio and low maintenance cost
Active Publication Date: 2017-07-14
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
However, this implementation method also has disadvantages. The sensing signal receives different energy in different ground resistance environments. It is difficult to realize in low-resistance formations. At the same time, it is difficult to process mechanically, which is inconvenient for on-site application and high in cost.
In addition, the wireless electromagnetic short transmission method needs to install two coils on the shell. As the transmission and reception, the coils must be completely insulated from the shell. It is also obvious that the processing and installation are too complicated, the contact area with the formation and mud is small, and the transmission signal cannot be injected into the formation in a large area. In order to ensure the amplitude requirements of the received signal, the transmission power can only be increased blindly, resulting in low transmission efficiency.
At the same time, the signal-to-noise ratio of the received signal is also poor
Method used
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Embodiment 1
[0027] like figure 1 As shown, near the drill bit constant power wireless short transmission device, the device includes a transmitting part and a receiving part, the transmitting part is connected with the drill bit measurement nipple, the receiving part is connected with the measurement while drilling system, and the transmitting part connects the The measurement data of the drill bit measurement nipple is processed and shortly transmitted to the receiving unit, and the receiving unit further processes the information and sends it to the measurement-while-drilling system. An insulating short joint is inserted in the middle of the structure of the emitting part, and the insulating short joint divides the emitting part into an electrically insulated positive emitter and a negative emitter;
[0028] An insulating short joint is respectively inserted in the middle of the structure of the receiving part, and the insulating short joint divides the receiving part into electrically ...
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A near-bit constant-power wireless short-distance transmission apparatus includes a transmitting portion and a receiving portion. The transmitting portion is connected to a near-bit measurement sub while the receiving portion is connected to a measurement while drilling system. The transmitting portion processes data received by the bit measurement sub and then transmits it to the receiving portion. The receiving portion further processes the information and then transmits it to the measurement while drilling system. An insulating sub is inserted in the transmitting portion and separates the transmitting portion into a transmitting positive pole and a transmitting negative pole, which become electrically isolated from each other. Another insulating sub is inserted in the receiving portion and separates the receiving portion into a receiving positive pole and a receiving negative pole, which become electrically isolated from each other.
Description
technical field [0001] The invention mainly belongs to the field of drilling measurement, and in particular relates to a near-drill constant power wireless short transmission method and device. Background technique [0002] At this stage, near-bit logging while drilling technology is developing rapidly. Compared with conventional logging while drilling, the sensor probe of near-bit logging tools is closer to the drill bit, which can obtain drilling formation information in a timely manner and more accurately mark drilling trajectories. Reduce drilling operation risk and improve operation efficiency. Generally speaking, the near-bit LWD instrument consists of the following three parts: near-bit measurement sub, near-bit short-distance transmission device and measurement while drilling system (MWD). Among them, the near-bit measurement sub-section is arranged close to the drill bit, and accelerometers, magnetic sensors, etc. are installed inside to measure the drilling trajec...
Claims
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IPC IPC(8): E21B47/12
CPCE21B47/12E21B47/13G01V11/002H04B15/02
Inventor 孙云涛陈文轩底青云郑健杨永友张文秀
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI