Near-bit multi-parameter underground measurement and control system while drillingTechnical Field
The invention relates to the field of underground data wireless measurement while drilling in drilling engineering, in particular to a near-bit multi-parameter underground measurement while drilling measurement and control system.
Background
With the development of the drilling technology, a near-bit measurement and control while drilling system is developed for further improving the drilling efficiency and the oil and gas exploitation rate of deep wells, ultra-deep wells and long horizontal section wells. The successful research and development of the near-bit measurement and control while drilling system can effectively solve a plurality of problems encountered in the drilling process of a deep well and a long horizontal-section horizontal well, reduce the operation risk, improve the operation efficiency, accurately obtain data such as measured bottom temperature, internal and external annular pressure, vibration, bit pressure, torque, rotating speed, bending moment and the like in real time, improve the safe drilling efficiency, and effectively avoid accidents such as drilling sticking, well kick, well leakage and the like.
Most of the drilling measurement and control systems in the prior art cannot solve the measurement problems of multiple engineering parameters such as bottom hole temperature, internal and external annular pressure, three-axis vibration, bit pressure, torque, rotating speed and bending moment, and cannot realize storage and real-time transmission of large data volume of underground data. And the measuring short section is relatively complex in mechanical structure, and the reliability of the downhole tool under the action of complex stress in the well is influenced. Therefore, the near-bit multi-parameter underground measurement and control while drilling system is provided, the measurement and control while drilling system is rich in measurement parameters, real-time changes of underground engineering parameters can be monitored in real time, and drilling parameters such as bit pressure, rotating speed, torque and drilling fluid performance are adjusted in real time according to the changes of the underground parameters. The downhole complex accidents such as well kick, well leakage, drill sticking, drilling tool damage and the like can be timely and accurately judged, and corresponding measures are taken to avoid more serious accidents, so that the non-drilling time can be greatly reduced, and the drilling timeliness is improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a near-bit multi-parameter underground measurement and control while drilling system which can monitor real-time changes of underground engineering parameters in real time, adjust drilling parameters such as bit pressure, rotating speed, torque and drilling fluid performance in real time according to the changes of the underground parameters, and improve drilling timeliness.
A multi-parameter underground measurement and control while drilling system for a near drill bit comprises ground equipment and an underground assembly, wherein the ground equipment comprises a pressure sensor, a wireless transmitting and receiving host, a wireless sensor host, a driller display and a data processing instrument, the underground assembly comprises a drill bit, a multi-parameter acquisition measurement transmitting pup joint, a screw power drilling tool, a fishing joint, a receiving transmitting pup joint, a first conversion joint, a wireless communication pup joint, a second conversion joint and a non-magnetic drill collar which are sequentially connected, the multi-parameter acquisition measurement transmitting pup joint comprises a drill collar, a power supply, a data processing circuit, a near drill bit measuring instrument, a transmitting antenna, an insulating ring and a data storage module, the near drill measuring instrument acquires data according to preset time intervals, stores the acquired data into the data storage module and transmits the acquired data to the data processing circuit, and the data processing circuit is in communication connection with the transmitting antenna, one end of the transmitting antenna is connected with a drill collar of the multi-parameter acquisition measuring transmitting nipple, the other end of the transmitting antenna is isolated from external drilling fluid through an insulating ring, the antenna coil of the transmitting antenna is designed by a vertical electric field method, and transmits signals to the receiving transmitting short section through a communication medium formed between the screw rod power drilling tool and the drilling fluid, the receiving and transmitting pup joint is provided with a signal receiving coil and a signal amplifier, one end of the signal receiving coil is connected with a drill collar of the receiving and transmitting pup joint, the other end of the signal receiving coil is isolated from external drilling fluid through an insulating ring, the signal amplifier amplifies signals received by the signal receiving coil and then conducts wireless transmission in an electromagnetic coupling mode to transmit the signals to the wireless communication pup joint, the wireless communication pup joint transmits the received signals to ground equipment in a pulse signal mode through a mud pulse generator, and the ground equipment decodes and analyzes underground data.
Furthermore, the outer diameter of the near drill end of the multi-parameter acquisition measurement transmitting pup joint drill collar is larger than that of the far drill end, an opening for placing a near drill measuring instrument is formed in the near drill end drill collar body, and the power supply, the data processing module, the transmitting antenna and the insulating ring are arranged at the far drill end of the drill collar body and protected by the casing and the end cover.
Furthermore, the near-drilling measuring instrument comprises a torque strain gauge, a pressure sensor, a temperature sensor, a three-axis acceleration sensor and a circuit board, wherein the torque strain gauge, the pressure sensor, the temperature sensor, the three-axis acceleration sensor and the circuit board are arranged in a plurality of openings in a drill collar of the multi-parameter acquisition measuring transmitting nipple.
Furthermore, the data collected by the near-drilling measuring instrument are triaxial acceleration, torque, bit pressure, annular internal and external pressure, temperature, rotating speed and bending moment.
Furthermore, an MWD measuring nipple is installed in the non-magnetic drill collar, and the wireless communication nipple collects data measured by the MWD measuring nipple and transmits the data to ground equipment.
Has the advantages that: compared with the prior art, the invention has the following technical effects:
(1) the near-bit multi-parameter underground measurement and control while drilling system has rich measurement parameters, can monitor real-time change of underground engineering parameters in real time, and can adjust drilling parameters such as bit pressure, rotating speed, torque, drilling fluid performance and the like in real time according to the change of the underground parameters. The downhole complex accidents such as well kick, well leakage, drill sticking, drilling tool damage and the like can be timely and accurately judged, and corresponding measures are taken to avoid more serious accidents, so that the non-drilling time can be greatly reduced, and the drilling timeliness is improved.
(2) The near-bit multi-parameter underground while-drilling system measures underground engineering parameters such as torque, bit pressure, bending moment, temperature, internal and external annular pressure, rotating speed, three-axis vibration and the like, is closer to the bit, eliminates the friction force between the drilling tool and the inner wall of the well and other interference factors, realizes real and accurate underground data and achieves the purpose of monitoring the underground actual working state of the drilling tool in real time.
(3) The communication system of the near-bit measurement and control while drilling system can realize the wireless communication between the near-bit measuring instrument of the near-bit measurement and control system and the signal receiving system through the cross-screw power drilling tool, and ensure the real-time acquisition and the timely and effective transmission of the near-bit engineering parameter transmitting short section measuring data.
(4) The invention adopts a vertical electric field method to design a transmitting antenna, utilizes a channel medium consisting of a screw rod power drilling tool and drilling fluid to transmit data, and a metal loop can not appear outside a coil of the transmitting antenna, so that a non-metal insulating ring is arranged at one end of a metal sheath outside the coil to form a small-gap communication channel, thereby realizing high-efficiency data transmission.
(5) The invention realizes the cross-screw power drilling tool communication of the near-bit measurement and control while drilling system, reduces the difficulty and cost of designing and processing communication lines, adopts the small-gap communication design, and greatly improves the underground wear resistance and pressure bearing performance of the measuring short section on the premise of ensuring the communication.
Drawings
FIG. 1 is a schematic structural diagram of a near-bit multi-parameter downhole measurement and control while drilling system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to the attached figure 1, the near-bit multi-parameter underground measurement and control system while drilling comprisesground equipment 10 and an underground assembly, wherein the ground equipment comprises a pressure sensor, a wireless transmitting and receiving host, a wireless sensor host, a driller display and a data processing instrument, the underground assembly comprises a bit 1, a multi-parameter acquisition measurement transmitting pup joint 2, a screwpower drilling tool 3, a fishing joint 4, a receiving transmitting pup joint 5, afirst conversion joint 6, a wirelesscommunication pup joint 7, asecond conversion joint 8 and anon-magnetic drill collar 9 which are sequentially connected, and the multi-parameter acquisition measurement transmitting pup joint 2 comprises a power supply, a data processing circuit, a near-bit measuring instrument, a transmitting antenna, an insulating ring and a data storage module. The near-bit measuring instrument comprises a torque strain gauge, a pressure sensor, a temperature sensor, a three-axis acceleration sensor and a circuit board. A plurality of holes are formed in the multi-parameter acquisition measurement transmitting nipple body and used for mounting a torque strain gauge, a pressure sensor, a temperature sensor, a three-axis acceleration sensor, a circuit board and the like. The near-drilling measuring instrument collects data according to a preset time interval, stores the collected data into a storage module and transmits the data to a data processing circuit, the data processing circuit is in communication connection with a transmitting antenna, one end of the transmitting antenna is connected with a drill collar of the multi-parameter collecting and measuring transmitting nipple, the other end of the transmitting antenna is isolated from external drilling fluid through an insulating ring, a power supply and the data processing circuit are respectively installed on the multi-parameter collecting and measuring transmitting nipple 2, the transmitting antenna is installed on the multi-parameter collecting and measuring transmitting nipple 2, the lower part of the multi-parameter collecting and measuring transmitting nipple is connected with a drill bit during underground connection, and the upper part of the multi-parameter collecting and measuring transmitting nipple is connected with a screwpower drilling tool 3.
A near-bit measurement and control while drilling system is characterized in that an antenna coil is designed by a vertical electric field method, and a communication medium is formed by a drilling tool and drilling fluid, so that multi-parameter acquisition and measurement of data transmission across a screw rod between a transmitting short section and a receiving transmitting short section are realized.
A nonmetal insulating ring is arranged at one end of a metal sheath outside a communication coil of the near-bit measurement and control while drilling system, so that a metal loop cannot appear, and a small-gap communication channel is formed to realize data transmission.
The power supply, the data processing circuit, the transmitting antenna and the insulating ring of the near-bit multi-parameter underground measurement and control while drilling system are installed on the multi-parameter acquisition measuring transmitting nipple, protected by the sleeve and the end cover and assembled into a near-bit data acquisition and signal transmitting end. And the receiving and transmitting of the measurement and control while drilling system are communicated with the wireless communication short joint through an electromagnetic coupling technology. Engineering parameters such as torque, bit pressure, bending moment, rotating speed, vibration, pressure, temperature and the like measured by the multi-parameter acquisition and measurement transmitting nipple 2 are closer to a drill bit, friction force between a drilling tool and the inner wall of a well and other interference factors are eliminated, underground data are real and accurate, and underground working state in the drilling process can be monitored in real time.
The drilling measurement and control system can acquire parameters such as triaxial acceleration, torque, bit pressure, annular internal and external pressure, temperature, rotating speed and bending moment according to a preset time interval and store the acquired data in the data storage module so as to be used for analysis after the instrument is started, and meanwhile, the data is transmitted to the receiving and transmitting nipple in the drilling measurement and control system through the communication coil. And then the receiving and transmitting short section carries out wireless transmission in an electromagnetic coupling mode to transmit signals to the wireless communication short section, and the mud pulse generator transmits pulse signals to a ground decoding system to decode and analyze underground data.
The receiving and transmitting nipple and the multi-parameter acquisition measurement transmitting nipple are communicated in a slurry medium through a wireless short transmission system, a signal receiving coil and a signal amplifier are arranged on the receiving and transmitting nipple, signals received by the signal receiving coil are amplified by the signal amplifier and then transmitted to awireless communication nipple 7 in real time, the MWD measurement nipple is installed in anon-magnetic drill collar 9 and acquires MWD measurement data, a slurry pulse generator is controlled by thewireless communication nipple 7 to transmit pulse signals to a ground system, and ground equipment decodes and analyzes underground data.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.