Please select the most similar patent number from A, B, C and D. Which number is?
A device for reducing annulus drilling fluid pressure at well bottoms, comprising a central shaft, and a cylinder body sleeved on the outside of the central shaft; the central shaft comprises, in order, a force transmission shaft (1) connected to a fluid re-distribution plunger (2); the cylinder body comprises a spline cylinder (3), an elastic-element protection cylinder (4), a connector (5), and a pressure reduction cylinder (6), which are connected in said order; the elastic-element protection cylinder and the connector are sleeved on the outside of the force transmission shaft, and an elastic element (7) is arranged between said protection cylinder and the force transmission shaft; the pressure reduction cylinder is sleeved on the outside of the fluid re-distribution plunger, a first fluid storage cavity (9) is formed between the pressure reduction cylinder, the connector, and the fluid re-distribution plunger, and a second fluid storage cavity (10) is formed between the pressure reduction cylinder and the fluid re-distribution plunger; a first inlet channel (11) and a first fluid discharge channel (12) are formed on the connector, and a second inlet channel (13) and a second fluid discharge channel (14) are arranged on the pressure reduction cylinder; the first inlet channel and the second inlet channel are each provided with a suction valve (15, 17), and the first fluid discharge channel and the second fluid discharge channel are each provided with a fluid discharge valve (16, 18). By using drill string vibration as a source of energy, the present device reduces the risk associated with drill string vibration and reduces the drilling fluid pressure at well bottoms, while increasing rock-breaking efficiency.
A: A deflation device for ejection overload control of a rocket ejection seat. The deflation device comprises single joints (1), a valve seat (4), and an electric initiator (7); the single joints (1) are provided on outer cylinders (10) of an ejection mechanism in one-to-one correspondence, the single joints (1) are in sealing communication with the top ends of the outer cylinders (10), and all the single joints (1) are in sealing communication with a multi-way joint (3) by means of respective guide pipes (2); the valve seat (4) is provided with a first channel and a second channel, the multi-way joint (3) is connected to the valve seat (4) and an outlet end of the multi-way joint is in sealing communication with an inlet of the first channel, an outlet of the first channel is communicated with the atmosphere, a piston rod (9) that cannot be detached is fitted in the second channel, and when in an initial state, the piston rod (9) is fixed to the valve seat (4) by means of a shear pin (5); the electric initiator (7) is mounted at an inlet of the second channel in a butt-joint manner by means of a mounting cylinder (6), the mounting cylinder (6) forms a closed channel between the electric initiator (7) and the piston rod (9), and when working, the electric initiator (7) can drive the piston rod (9) to shear off the shear pin (5) and enable same to extend out of an outlet of the second channel to block the outlet of the first channel. The device can control the magnitude of ejection overload according to requirements, thereby reducing the complexity and weight of a control system.
B: A horizontal well drilling apparatus for testing lubricity, taking a cuttings bed into account. The testing apparatus comprises a simulated wellbore (8), wherein one end of the simulated wellbore is provided with a pulley (16), and the other end is fixed with a hydraulic cylinder (38) and installed with a drill pipe (5), the drill pipe (5) being connected to a drive mechanism (1) and a rotation drive mechanism (4), and the drill pipe (5) being provided with a thrust sensor (2) and a torque sensor (3); a cuttings feeding port (9) is arranged above the simulated wellbore (8), and is connected to a slurry tank (24) via a fluid inlet pipeline (18), the fluid inlet pipeline (18) being provided with a high-pressure pump (23), a flowmeter (22) and a pressure sensor (19); a lower end of the simulated wellbore (8) is connected to a fluid return pipeline (26), the fluid return pipeline (26) being provided with a temperature- and pressure-reducing mechanism (29), a flowmeter and a conveying pump (28); and the simulated wellbore (8) is provided with an ultrasonic probe (6) and is connected to a core holder (13), the core holder (13) being provided with a heating mechanism, a core (11) and a pressure mechanism, and an inner side of a lower wall of the simulated wellbore is provided with a cuttings lifting platform (7). According to the apparatus, during a test, cuttings and a drilling fluid are added, and the pressure, the temperature, and the thickness of the cuttings are adjusted to simulate composite drilling. The apparatus not only takes the friction between a drill column and the drilling fluid, a well wall and a mud cake into account, but also takes the friction between the drill column and a cuttings bed into account, thus being more in keeping with actual working conditions.
C: A pump head and a container for daily use. The pump head comprises a piston (2), and further comprises an axial moving assembly (1), a liquid suction channel (4), an outflow channel (5), and a support (6). The axial moving assembly (1) comprises a buffer liquid portion (11), an opening portion (12), a closing end (13), and a sealing portion (31, 32); the internal space of the buffer liquid portion (11) and opening portion (12) are a liquid storage space (14); one end of the liquid storage space (14) is closed by the piston (2), and the other end is closed by the closing end (13); the opening portion (12) is provided with an opening (15); in order of distance from the piston (2) from near to far, an outlet (41) of the liquid suction channel (4) and an inlet (51) of the outflow channel (5) are sequentially arranged on a side edge of the stroke of the opening (15) and both can communicate with the opening (15); the sealing portion (31, 32) seals a seam at a joint when the opening (15) communicates with the outlet (41) of the liquid suction channel (4) or with the inlet (51) of the outflow channel (5).
D: A high pressure liquid cylinder structure, comprising: a cylinder (100), provided with an inlet passage (110) located at a side portion, a mounting space being vertically provided at the middle of the cylinder, the inlet passage being connected to the mounting space; a suction valve structure (200), detachably mounted inside the mounting space and close to the inlet passage, the suction valve structure comprising a liquid inlet hole (211), a liquid discharging hole (212), and a suction valve passage hole (213) communicated with the liquid inlet hole and the liquid discharging hole, wherein the liquid inlet hole and the inlet passage are communicated, a suction valve core (220) is movably mounted at the suction valve passage hole, and after the suction valve core moves, the suction valve core can be disconnected from or communicated with the suction valve passage hole and the liquid discharging hole; and a discharge valve structure (300), detachably mounted inside the mounting space and located above the suction valve structure, the suction valve structure comprising a discharge valve passage hole (311) communicated with the liquid discharging hole, wherein an outlet pipeline (400) is connected to an outlet of the discharge valve passage hole, a discharge valve core (320) is movably mounted at the discharge valve passage hole, and after the discharge valve core moves, the discharge valve core can be disconnected from or communicated with the discharge valve passage hole and the outlet pipeline. Further discloses is a vertical type combination valve group.
Answer: B