Chinese Academy of Sciences

Beijing Xiaomi Mobile Software Co., Ltd.

Wenxuan Chen

Wei Liu

Yang Liu

Qingyun Di

Yongyou Yang

Wenxiu Zhang

Jian Zheng

Yuntao Sun

Zili Wang

Jiansheng Du

Xinzhen He

Qingbo Liu

Qijun Xie

Linfeng Hong

Tsili Wang

Fuqiang Wei

Jianguang Liu

Hong Li

Xin Fu

Yali Zhang

Zhongxing Wang

Tianxin Zhang

Changchun Yang

Nan Fan

Wenqiang Yuan

Yang Gou

A method for positioning a device includes: sending a query instruction to a server, wherein the query instruction is configured to query a target coordinate location of the terminal device. The method also includes receiving a query response from the server. The query response includes the target coordinate location and a target public key digest. The target coordinate location is obtained by encrypting a coordinate location that is positioned for the device. The target coordinate location is sent to the server as well as the target public key digest synchronously. The method also includes determining a target private key based on the target public key digest; and decrypting the target coordinate location using the target private key to obtain the coordinate location located by the device.

Method for positioning terminal device, electronic device and storage medium

The present disclosure provides a method and device for synchronizing azimuth detection data while drilling. The method includes: starting, by a control module, according to a command that measurement has been started sent by a tool face angle measurement module, a timer to record a first time, and sending, by the control module, a detection signal acquisition starting command to a detection signal acquisition module; performing, by the detection signal acquisition module, a parameter configuration according to the detection signal acquisition starting command, and sending, by the detection signal acquisition module, a command that work has been started to the control module based on a configuration completion state; stopping the timer and recording a second time by the control module according to the command that work has been started.

Method for synchronizing azimuth detection data while drilling and device for azimuth detection while drilling

An acoustic while drilling receiving transducer array adopts a full-digital structure and a non-oil-filled rubber encapsulation arrangement mode, and the full-digital device of the acoustic while drilling receiving transducer array includes first modules, configured to carry out acoustic-to-electric conversion on weakly received acoustic signals of strata; second modules, configured to carry out amplification, filtering, gain control and digital-to-analog conversion on the weakly received acoustic signals; and a third module, configured to control interfaces of the device and convert external input and output signals.

Full digital device of receiving transducer array of acoustic logging while drilling instrument

A mounting and demounting control system is used for installing a radioactive source in nuclear logging instruments. In this system, a tail end of a truss manipulator is fixedly provided with a worktable through a bolt, a left side of an upper surface of the worktable is provided with a source capsule mounting and demounting manipulator, a right side is provided with a compression screw mounting and demounting manipulator, and the upper surface of the worktable close to the inner side of the two manipulators is respectively provided with opposed photoelectric sensors through bolts; four corners of the truss manipulator are fixed to a support through bolts, a beam is fixed between two legs at the front side of the support through bolts; and a positioning device is placed near the front of the support, and an upper part of positioning device is fixedly provided with an instrument.

Source automatic mounting and demounting control system and method for nuclear logging instruments

An electrode-type near-bit wireless short-distance transmission modulation method includes the steps of by a near-bit measuring tool, measuring parameters, and acquiring parameter information, and packing the parameter information into a data packet, and transmitting the data packet to a transmission processor part; by the transmission processor part, performing binary frequency shift keying modulation on the data packet, and according to a set transmission power and driving source power, passing the modulated data packet through an amplifying circuit and a driving circuit, and then loading the modulated data packet to positive and negative electrodes of a transmitter; and by the positive and negative electrodes of the transmitter, transmitting the modulated data packet passed through the amplifying circuit and the driving circuit to a receiver, so as to realize electrode-type wireless short-distance transmission modulation.

Electrode type near bit wireless short distance transmission modulation method and apparatus

The disclosure relates to a fluid pressure measuring device for a measurement-while-drilling tool, which including a first sensor assembly (), a second sensor assembly () and a sealing member (), wherein a mounting groove () is formed on an outer side wall of a drill collar () of a measurement-while-drilling tool; the sealing member () is fixedly mounted on the mounting groove (); a first liquid inlet hole () is formed in the sealing member (); a second liquid inlet hole () communicated with a center flow channel () of the drill collar () is formed in the mounting groove (); a liquid inlet end of the first sensor assembly () is communicated with the first liquid inlet hole (); and a liquid inlet end of the second sensor assembly () is communicated with the second liquid inlet hole ().

Fluid pressure measuring device for measurement-while-drilling tool

In a method for acquiring data of azimuthal acoustic LWD, when an acoustic LWD instrument rotates with a drilling tool at a certain depth, data is acquired by adopting an azimuthal equal-interval mode: a well circumference is divided into m sectors by azimuthal intervals &#x394;&#x3b8;, when a toolface angle of the acoustic LWD instrument is located in the ksector, an acoustic transmitting source is controlled to transmit an acoustic signal, and an acoustic receiver measures the acoustic signal, digitizes it and then stores it as data in the ksector; and the data is acquired for each sector in turn, and after the data is acquired in each sector for N times, the data acquisition at the current depth is completed. Meanwhile, as the drilling tool rotates and drills, the instrument acquires acoustic data at different depths and processes it to achieve azimuthal acoustic imaging.

Method for acquiring data of azimuthal acoustic logging while drilling

A rotary guiding device includes a rotating shaft to rotationally drive a tool head. The rotating shaft includes upper and lower shaft portions, and a steerable portion, the upper shaft portion and the lower shaft portion are steerably connected by the steerable portion. A non-rotating body is mounted on the upper shaft portion, the non-rotating body is substantially non-rotating with respect to the rotating shaft in circumferential direction when the rotating shaft rotationally drives the tool head. The lower shaft portion includes a rib portion coinciding at least partially in axial direction with the non-rotating body. The non-rotating body includes at least three hydraulic driving mechanisms uniformly distributed along its circumferential direction, the three hydraulic driving mechanisms controllably generate radial drive forces respectively, the radial driving forces act on the rib portion overlapping the non-rotating body so the lower shaft portion can be deflectable relative to the steerable portion.

Rotary guiding device based on radial driving force

A sonic logging broadband impedance matching transformer modular design method and a module are related to sonic logging. The method includes the steps: obtaining component values of a multimodal equivalent circuit of a piezoelectric transducer by fitting actual impedance data of the piezoelectric transducer through a nonlinear regression method; selecting a T-type network structure composed of a matching capacitor and a matching inductor as a piezoelectric transducer impedance matching network structure; and presetting a to-be-matched frequency band and a reflection coefficient, and taking the multimodal equivalent circuit of the transducer as an artificial circuit load to optimize parameters of the piezoelectric transducer impedance matching network structure and a boosting transformer together so as to obtain final optimized parameters of the piezoelectric transducer impedance matching network structure and the transformer.

Sonic logging broadband impedance matching transformer modular design method and module

An apparatus for measuring gravity acceleration of a drilling tool comprises sensors and a measurement circuit. The sensor comprises a three-axis gravity accelerometer, a reference measurement sensor and a temperature sensor. The three-axis gravity accelerometer measures acceleration component signals in three mutually orthogonal directions, and the reference measurement sensor generates a signal that varies with rotation and is not affected by vibration or shock to serve as a reference signal. The temperature sensor measures the temperature in the apparatus to compensate the temperature effect of the gravity accelerometers. The measurement circuit acquires output signals of the sensors and performs cross-correlation processing on the accelerometer components using the reference signal to extract gravity acceleration signals so as to eliminate centrifugal acceleration, vibration, shock and other interferences generated by rotation. The non-interference gravity acceleration signals is used for calculating an inclination angle and a toolface angle of a drilling tool in the rotating state.

Gravity acceleration measurement apparatus and extraction method in a rotating state

A near-bit wireless constant current short-distance transmission device has an emission part and a receiving part. The emission part modulates a signal and then wirelessly transmits the modulated signal to the receiving part. The emission part transmits an emission signal into a stratum according to a set rated emission constant current value, and dynamically monitors and adjusts the rated emission constant current value of the emission signal to obtain stable emission power.

Near bit wireless constant current short distance transmission method and device

In a method for synchronizing acoustic asynchronous serial signals while drilling, communication and high-voltage signal isolation between a transmitting terminal and a receiving master control board are realized in an asynchronous serial communication way. The receiving master control board serving as a master control terminal configures parameters for the transmitting terminal in the asynchronous serial communication way and controls the excitation of a sound source. The transmitting terminal is a synchronous sound source excitation signal initiator; signal synchronization is realized under an asynchronous communication condition due to the coordination of the transmitting terminal and the receiving master control board; the transmitting terminal includes a plurality of transmitting boards, and asynchronous serial communication between each of the transmitting boards and the receiving master control board is realized through two data lines R+ and R.

Method for synchronizing acoustic asynchronous serial signals while drilling

Disclosed is a downhole vibration and impact data recording method, comprising: performing analog-to-digital conversion on analog data, outputting digital format data obtained at a sampling rate f, and performing sampling storage processing and analysis storage processing on the same. The sampling storage processing includes outputting the digital format data obtained at a sampling rate fn through multiple samplings; storing the same continuously into a storage module. The analysis storage processing includes: buffering the digital format data obtained at the sampling rate finto a memory; analyzing the same to determine whether an impact event occurs, and if yes, storing the current data in the memory into the storage module, and then jumping back to the buffering step; otherwise, jumping directly back to the buffering step. With the above method, the amount of data storage can be effectively reduced, while the characteristics of the vibration and impact data can be analyzed.

Downhole vibration and impact data recording method

A hybrid rotary guiding device, includes: rotating shaft, the rotating shaft is used to drive the head of a drill tool to rotate, the rotating shaft includes an upper shaft portion, a lower shaft portion, and a steerable portion, a separation distance exists between the upper shaft portion and the lower shaft portion in the axial direction, the upper shaft portion and the lower shaft portion are steerably connected by the steerable portion; the upper shaft portion is installed with at least three first hydraulic mechanisms, and the lower shaft portion is installed with at least three second hydraulic mechanisms, the second hydraulic mechanism is adapted to drive a pushing member against the wall of the well to guide the head of a drill tool, the first hydraulic mechanism and the second hydraulic mechanism are configured so that the first hydraulic mechanism can drive the second hydraulic mechanism to drive the pushing member. The present invention combines the advantages of directional and push-oriented guidance, the influence of formation properties on the build-up slope is largely eliminated, a higher build rate can be provided, and the demand for energy consumption is greatly reduced.

Hybrid rotary guiding device

A constant amplitude adjusting method and system for pressure pulse of drilling tool including obtaining a current flow velocity value of mud at the rear of a pressure pulse generator in the drilling tool, and sending the current flow velocity value to a controller; the controller compares the current flow velocity value with a preset flow velocity value, and sends an adjustment instruction to the pressure pulse generator according to the comparison result; the pressure pulse generator adjusts the opening degree according to the adjustment instruction of the controller. The adjusting system comprising a pressure pulse generator for generating a pressure pulse wave, and the opening degree is adjustable.

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Beijing, China

Wenxuan Chen