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CN-121993023-A - Down-the-hole CPT tool while drilling for offshore use

CN121993023ACN 121993023 ACN121993023 ACN 121993023ACN-121993023-A

Abstract

The invention relates to the technical field of ocean engineering geological exploration equipment, in particular to a down-the-hole CPT tool used at sea, which comprises the following components: the multi-channel drill rod assembly comprises a multi-channel drill rod, wherein a cable pipeline, a slurry pipeline, an air pipeline and a standby channel are integrated in the multi-channel drill rod and used for synchronously transmitting electric signals, slurry media and compressed air. According to the invention, the static penetration mechanism and the underground rock breaking hole sweeping mechanism are integrated, and the synchronous transmission of power and media is realized by adopting the multi-channel drill rod, so that a continuous operation mode of seamless joint while drilling and penetration is constructed, a pneumatic motor can be immediately started to drive a drill bit to sweep holes at the next stage after a section of stratum penetration test is completed without lifting holes, and the discontinuous circulation process of the traditional test, drilling lifting, hole sweeping, recycling and lowering is changed, so that the offshore CPT operation is changed from frequent start and stop to continuous process of one-step completion.

Inventors

  • WANG XIAOHU
  • ZHANG XIANFENG
  • QIAN ZHENYUAN
  • HU MINFANG
  • LIU JIANYU

Assignees

  • 无锡市鑫探工程机械制造有限公司

Dates

Publication Date
20260508
Application Date
20260327

Claims (9)

  1. 1. A downhole CPT while drilling tool for offshore use, comprising: the multi-channel drill rod assembly comprises a multi-channel drill rod (11), wherein a cable pipeline (10), a slurry pipeline (8), an air pipeline (9) and a standby channel are integrated in the multi-channel drill rod (11) and are used for synchronously transmitting electric signals, slurry media and compressed air; The underground power execution assembly comprises a waterproof motor (6), a ball screw device (2) and a pneumatic motor (13), wherein a speed reducer (5) is arranged at the output end of the waterproof motor (6), the output end of the speed reducer (5) is connected with a coupler (3), the output end of the speed reducer (5) drives the ball screw device (2) through the coupler (3), the ball screw device (2) is provided with a push rod (14) through a bolt, the pneumatic motor (13) comprises a stator (12) and a rotor (15), and one end of the rotor (15) is connected with an opening and closing PDC drill bit (17); The static cone penetration assembly comprises a four-bridge probe (18), and a sensor is arranged in the four-bridge probe (18); The ground supporting system comprises a data display system (20), a data acquisition system (21), an air compressor (22) and a slurry pump (19), wherein the data display system (20) and the data acquisition system (21) are connected with a four-bridge probe (18) through signals of the cable pipeline (10), the air compressor (22) supplies air for the pneumatic motor (13) through the air pipeline (9), and slurry output by the slurry pump (19) is conveyed to the position of the PDC drill bit (17) through a slurry pipeline (8) of the multi-channel drill rod (11).
  2. 2. A downhole CPT while drilling tool for use at sea as claimed in claim 1, wherein each section of the multi-channel drill pipe (11) is internally provided with a cable pipeline (10), a slurry pipeline (8), an air pipeline (9) and a backup pipeline which are mutually independent, and each channel extends along the axial direction of the drill pipe.
  3. 3. The downhole CPT while drilling tool for use at sea as recited in claim 1, wherein the downhole power execution assembly further comprises a water-tight joint (7), the water-tight joint (7) being disposed at a connection end of the multi-channel drill pipe (11) and the downhole assembly for isolating downhole mud water from an internal transmission channel.
  4. 4. The down-the-hole CPT tool for offshore use according to claim 1, wherein an outer tube (1) is arranged outside the ball screw device (2), the outer tube (1) is relatively fixed with the multi-channel drill rod (11) and the stator (12), the ball screw device (2) comprises a screw rod, a ball nut and an anti-rotation guide sleeve, the screw rod is connected with the output end of the speed reducer (5) through the coupler (3), the ball nut is rigidly connected with the push rod (14), the anti-rotation guide sleeve limits the ball nut to rotate, and the push rod (14) is driven to axially reciprocate when the screw rod rotates.
  5. 5. The down-the-hole CPT while drilling tool for offshore use as claimed in claim 4, wherein a fixed joint (4) is arranged outside the waterproof motor (6), the fixed joint (4) is fixedly connected with the outer pipe (1), and the waterproof motor (6) receives ground power supply through a cable pipeline (10).
  6. 6. A downhole CPT while drilling tool for offshore use according to claim 1, wherein said pneumatic motor (13) is powered by compressed air.
  7. 7. A downhole CPT while drilling tool for offshore use according to claim 1, wherein a probe protection tube (16) is provided outside the four-bridge probe (18), the probe protection tube (16) being connected to the end of the push rod (14).
  8. 8. A downhole CPT while drilling tool for offshore use according to claim 1, wherein the mud channel of the mud pipe (8) is an annular aperture between the multi-channel drill pipe (11) and the outer pipe (1).
  9. 9. A downhole CPT while drilling tool for offshore use according to claim 1, wherein the connection of the rotor (15) to the openable PDC bit (17) is of detachable design.

Description

Down-the-hole CPT tool while drilling for offshore use Technical Field The invention relates to the technical field of ocean engineering geological exploration equipment, in particular to a down-the-hole CPT tool used at sea. Background Static sounding test is a key in-situ test technology for obtaining geological parameters of seabed soil engineering. At present, the offshore CPT operation in China generally adopts a drilling-sounding alternating process mode, namely, after drilling a drill hole with a certain depth by using a drilling machine, a special CPT tool is lowered from the inside of a drill rod to the bottom of the hole for penetration test. However, when the conventional CPT tool is operated, after the CPT tool completes a section (such as 3 meters) of penetration test, the whole set of tool is required to be completely lifted from the drill rod to be lifted to the deck, then the drilling machine performs about 3 meters of 'hole sweeping' to remove residual drilling cuttings in the hole, meanwhile, an operator needs to manually recover a used push rod in the CPT tool on the deck and prepare for the next section of test, and after the steps are completed, the tool can be re-lowered to the bottom of the hole to continue operation. To this end we propose a down-the-hole CPT while drilling tool for offshore use. Disclosure of Invention The invention aims to provide a down-the-hole CPT tool used at sea, which has the advantages of reducing cost, improving efficiency and precision, and safety and stability, and solves the problems of complicated flow and frequent interruption, low effective test time of single-hole operation, low overall working efficiency, prolonging the window period of offshore operation and increasing the exploration cost of the existing cyclic operation mode of test-lifting drill-sweeping hole-recycling and lowering. In order to achieve the purpose, the invention provides a technical scheme that a down-the-hole CPT tool used at sea comprises the following steps: the multi-channel drill rod assembly comprises a multi-channel drill rod, wherein a cable pipeline, a slurry pipeline, an air pipeline and a standby channel are integrated in the multi-channel drill rod and used for synchronously transmitting electric signals, slurry media and compressed air; the underground power execution assembly comprises a waterproof motor, a ball screw device and a pneumatic motor, wherein the output end of the waterproof motor is provided with a speed reducer, the output end of the speed reducer is connected with a coupler, the output end of the speed reducer drives the ball screw device through the coupler, the ball screw device is provided with a push rod through a bolt, the pneumatic motor comprises a stator and a rotor, and one end of the rotor is connected with an opening and closing PDC drill bit; The static cone penetration assembly comprises a four-bridge probe, wherein a sensor is arranged in the four-bridge probe; The ground supporting system comprises a data display system, a data acquisition system, an air compressor and a slurry pump, wherein the data display system is connected with the data acquisition system through cable pipeline signals, the air compressor supplies air for the pneumatic motor through an air pipeline, and slurry output by the slurry pump is conveyed to the PDC drill bit opening and closing position through a slurry pipeline of the multi-channel drill rod. Preferably, each section of drill rod of the multi-channel drill rod is internally provided with a cable pipeline, a slurry pipeline, an air pipeline and a standby pipeline which are mutually independent, and each channel extends along the axial direction of the drill rod. Preferably, the downhole power execution assembly further comprises a water-proof joint, wherein the water-proof joint is arranged at the connecting end of the multi-channel drill rod and the downhole assembly and used for isolating downhole muddy water and an internal transmission channel. Preferably, an outer tube is arranged outside the ball screw device, the outer tube is relatively fixed with the multi-channel drill rod and the stator, the ball screw device comprises a screw rod, a ball nut and an anti-rotation guide sleeve, the screw rod is connected with the output end of the speed reducer through the coupler, the ball nut is rigidly connected with the push rod, the anti-rotation guide sleeve limits the ball nut to rotate, and the anti-rotation guide sleeve is used for driving the push rod to axially reciprocate when the screw rod rotates. Preferably, the outside of waterproof motor is equipped with fixed joint, fixed joint with outer tube fixed connection, waterproof motor passes through cable duct and receives ground power supply. Preferably, the pneumatic motor uses compressed air as a power source. Preferably, a probe protection tube is arranged outside the four-bridge probe, and the probe protection tube is connected with the tail en