Hunan University of Science and Technology

Shanghai Jiao Tong University

Yongping Jin

Buyan Wan

Youduo Peng

Xiaojun Huang

Jialiang Wang

Fenfei Peng

Ping Liu

Huan Liu

Deshun Liu

Zhaodong Tong

Ping Ren

Liang Liu

Jun Gong

Xiafei Ma

Kun Xie

Chang Wu

Guangping Liu

Wenbo Tang

Xiaobin He

Jian Yan

Xiaojun Hunag

A pre-tension and tensile impact test apparatus capable of simulating a full-sea-depth environment includes a pre-tensioning device, a Hopkinson bar device, a seawater pressure simulation device, a power source group and an acquisition control unit. The Hopkinson bar device includes an input rod, an air compressing device, a test sample and an output rod. The pre-tensioning device, the input rod, the air compressing device, the seawater pressure simulation device, the test sample and the output rod are successively arranged on the same axis. The air compressing device includes an air cylinder, an end cover and an impact piston. Two ends of the air cylinder are each provided with the end cover. The impact piston and the air cylinder are in clearance fit. The input rod is coaxially connected to the impact piston. Two ends of the input rod each extend out of the end cover.

Pretension and tensile impact test apparatus capable of simulating full-sea-depth environment

A testing device for simulating frictional wear behaviors of threaded joints of a drill pipe under turbid seafloor environment, including a support, an oil cylinder, upper and lower specimens, a first motor, several second motors, stirring rods, a turbidity sensor, and a test tank. The oil cylinder and test tank are arranged on the support. A piston rod of the oil cylinder is connected to the first motor. A rotating-speed sensor is arranged on a bottom surface of the first motor, facing toward an output shaft of the first motor. The output shaft of the first motor is connected to an upper end of a torque limiter. A lower end of the upper specimen fits an upper end of the lower specimen under loading of a main shaft of the first motor. The stirring rods are provided at two sides of the test tank.

Testing device for simulating frictional wear behaviors of threaded joint of drill pipe under turbid seafloor environment

A full-sea depth multi-point in-situ sampler includes a sampling assembly, a pressure-retaining assembly, a pressure-compensating assembly, and a cleaning assembly. The sampling assembly includes a handle, an extrusion valve, a needle valve core, a two-stage piston, a sampling tube, and a capturing device. The pressure-retaining assembly includes a pressure-retaining cylinder, a locking mechanism, a floating valve core, a support spring, and a drainage device. The pressure-compensating assembly includes a pressure-compensating cylinder, a piston, and an end cap. The cleaning assembly includes a cleaning sleeve, a cleaning cylinder, and multiple trigger mechanisms. A sampling and transfer method based on the sampler is also provided.

Full-sea depth multi-point in-situ sampler, and sampling and transfer method using the same

A micro core-drilling testing system for high-pressure environment, including: a pressure chamber, a micro core-drilling testing platform and a control device. The micro core-drilling testing platform includes a lower tray, a middle tray, a hydraulic system, a stroke cylinder, a rock sample plate, a rock sample block, a pressure compensation device and a drilling rig. The drilling rig is configured to carry out core-drilling operation. The hydraulic system is configured to provide power for the drilling rig. The pressure compensation device is configured to balance the pressure inside the pressure chamber and the hydraulic system.

Micro core-drilling testing system for high-pressure environment

A drilling and sampling device applied to a seafloor tracked vehicle, including a slide seat, a positioning electromagnet, a pipe-replacing cylinder, a dial claw, a plurality of clamping assemblies, a plurality of sampling drill pipes, a drill pipe rack, a frame, a thrust cylinder, a pipe-releasing assembly, a guide rod, a drive pipe, a power head, and a pipe-replacing disc. The guide rod and the thrust cylinder are fixedly arranged on the frame. The slide seat is in clearance fit with the guide rod. A piston rod end of the thrust cylinder is hingedly connected to the slide seat. The power head is fixedly arranged on the slide seat. The drive pipe is arranged at an output end of the power head, and is coaxially screwed with the plurality of sampling drill pipes. The dial claw is slidably arranged in the arc guide groove.

Multi-point drilling and sampling device applied to seafloor tracked vehicle

A suction sampler system for in situ collection of deep-sea floor organisms includes a pressure-retaining cylinder, a pressure compensation device, a cone component, semiconductor refrigeration components, a circuit cylinder and a collection cylinder. Two ends of the pressure-retaining cylinder are respectively equipped with a first and second seal mechanisms, and the cone component is arranged in the pressure-retaining cylinder. The pressure compensation device is connected to the pressure-retaining cylinder through a high-pressure pipe. The semiconductor refrigeration components are arranged outside the pressure-retaining cylinder. The circuit cylinder is equipped with a power supply and a controller, and the semiconductor refrigeration components are connected to the controller. A pressure sensor and a temperature sensor are arranged inside the pressure-retaining cylinder, and respectively connected to the controller. The collection cylinder communicates with the valve hole of the second seal mechanism through a pipeline.

Suction sampler system for in situ collection of deep-sea floor organisms and method of using same

A friction and wear testing platform capable of simulating high-pressure, silt-containing and turbid submarine environment, including a tank, a loading device, a partition plate, a partition cylinder, a top sealing sleeve, a bottom sealing sleeve, a rotating shaft, an inner magnetic cylinder, an outer magnetic cylinder and a centering table. The partition plate and the partition cylinder divide an inner chamber of the tank into a test chamber and a pressure compensation chamber. The rotating shaft penetrates the pressure compensation chamber; two ends of the rotating shaft are sealed by the top and bottom sealing sleeves, respectively, as well as sealing bearings and rings therein. The loading device drives the rotating shaft to rotate, and the rotating shaft drives the inner magnetic cylinder to rotate. The centering table is driven through the magnetic coupling between the inner and outer magnetic cylinders to install a test piece.

Friction and wear testing platform capable of simulating high-pressure, silt-containing and turbid submarine environment

A horizontal drilling machine with an in-situ detection device, including a support frame, an armored cable, a steel pipe-straightening mechanism, a steel pipe-feeding mechanism, a motor, a power head, a drill pipe, a rotating chuck, a damper, a non-core drilling tool, the in-situ detection device, a fishing device and a thrust cylinder. The steel pipe-straightening mechanism, the steel pipe-feeding mechanism, the rotating chuck and the damper are sequentially fixed on the support frame from left to right. One end of the thrust cylinder is hinged with the support frame, and the other end is connected to the power head. The active drill pipe of the power head is connected to the drill pipe. An end of the armored cable is connected to the fishing device in the drill pipe, and the fishing head of the fishing device is connected to the spearhead of the non-core drilling tool.

Horizontal drilling machine with an in-situ detection device

A horizontal drilling machine with an impact device, including a support frame, an armored cable, a cable-straightening mechanism, a cable-feeding mechanism, a power head, a drill pipe, a rotating chuck, a damper, a fishing device with the impact device, a core tube and a thrust cylinder. One end of the thrust cylinder is hinged with the support frame, and the other end of the thrust cylinder is connected to the power head. The power head is arranged on a slid rail of the support frame. An active drill pipe of the power head is connected to the drill pipe. An end of the armored cable is connected to a control system, and the other end is connected to the fishing device in the drill pipe. A fishing head of the fishing device is connected to a spearhead of the core tube.

Horizontal drilling machine with impact device

A long-distance core drilling method suitable for a horizontal geological core drilling rig. (1) An active drill rod is connected to a drill rod, which is connected to a wireline-coring outer-tube drilling tool. (2) A steel-pipe string is connected to a fishing device, and the fishing device is connected to a spearhead on a core tube, which is placed to a designated position through a pipe-feeding mechanism. (3) A washing pump is started. (4) A core drilling is carried out. (5) A core is pulled out. (6) The steel-pipe string and the fishing device are reconnected. (7) The core tube is salvaged. (8) The core tube and drill pipe are replaced. (9) A hole is swept. (10) Steps (1)-(9) are repeated until the hole is drilled to a designated depth. (11) The core tube and the wireline-coring outer-tube drilling tool are recovered.

Long-distance core drilling method suitable for a horizontal geological core drilling rig

A support device for the rotation of a high-capacity and compact drill pipe storage unit of a seabed drilling rig in a lying state, including: a rack, a plurality of curved support frames, a plurality of lateral drill pipe stoppers and a plurality of annular fences. The curved support frames are provided parallelly and coaxially on a slideway of the rack. A separating plate is provided on each of the curved support frames. A curved support surface of each of the curved support frames is in contact with a circular edge surface of the corresponding separating plate. The annular fences are mounted on the rack. Each of the annular fences is provided with a first gap and a second gap. The first gap is provided corresponding to the lateral drill pipe stopper. The second gap is configured to allow the drill pipes enter and exit the drill pipe storage unit.

Support device for rotation of high-capacity and compact drill pipe storage unit of seabed drilling rig in lying state

The present disclosure provides a portable seafloor drill rig for a submersible for multi-point core drilling, including a power head, a reduction gear box, an emergency jettison device, a drilling tool, and a temperature and pressure-retaining device. a water supply connector and the power head are arrange on a top plate of the reduction gear box. An output shaft of the power head is connected to an input shaft of the reduction gear box, and an output shaft of the reduction gear box is provided with a central hole, which is in communication with a water inlet hole of the water supply connector. An output shaft of the reduction gear box is connected to the emergency jettison device, and the temperature and pressure-retaining device can perform temperature and pressure-retaining storage of the core drilled by the drilling tool.

Portable seafloor drill rig for submersible for multi-point core drilling

There is provided a wireline coring recovery system of a seafloor drilling rig, including: a winch, a rope, a submersible tension sensor, a cover, a main shaft and a catcher. One end of the rope is wound on the winch, and the other end of the rope is connected to an upper end of the catcher after the rope passes over a first pulley provided below the submersible tension sensor and then through a tapered hole on the cover. The catcher is provided in a center hole of the main shaft. The present application further provides a method of using the wireline coring recovery system. By the cooperation of the compression rod skewed teeth, the first rotating core skewed teeth, the second rotating core skewed teeth and the compression spring, the inner core barrel is readily recovered or released.

Wireline coring recovery system of a seafloor drilling rig and method of using same

The present disclosure discloses a pressure-retaining cap screwing and unscrewing device for a marine natural gas hydrate pressure-retaining rock-core barrel, wherein it comprises a cap-unscrewing chuck, a support cylinder, a pressure-retaining cap screwing and unscrewing head, a spring, a screwing and unscrewing shaft, and a pressure-retaining cap screwing and unscrewing sleeve, a reducer and a motor; an input shaft of the reducer is connected to the motor, an output shaft of the reducer is the screwing and unscrewing shaft which is a tubular structure with a plurality of guide holes provided on a side wall thereof. The device is simple in structure, compact, light in weight, and convenient to control, and the pressure-retaining cap can be discarded.

Pressure-retaining cap screwing and unscrewing device for marine natural gas hydrate pressure-retaining rock-core barrel

Disclosed is a sediment core-drilling process for a submarine wire-line coring drill rig, including 1) lowering the drill rig; 2) drilling in a pressure-suction mode; 3) drilling in a rotation-pressure-suction mode; 4) cutting sediment cores; 5) recovering a core inner tube; 6) cleaning bottom of hole; 7) punching before adding a drill pipe; 8) lowering another core inner tube; 9) adding the drill pipe; 10) punching after adding the drill pipe; 11) repeating the steps 2)-10) until a given hole depth is reached; 12) recovering the drill pipe and a wire-line coring outer tube drilling tool; 13) recovering the submarine wire-line coring drill rig. The core-drilling process provided herein is suited to working conditions without mud lubrication and mud protection for hole wall. This invention has advantages of low disturbance and high efficiency in coring and is suitable for remote operation.

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Hunan, China

Yongping Jin