A core sampling and preservation system comprises the following sequentially connected modules: a drive module (300), a preservation module (200) and a core sampling module (100). The core sampling module (100) comprises a core drilling tool and a core sample storage compartment. The preservation module (200) comprises a core sample preservation container. The drive module comprises a core drill having a liquid channel. The core sample preservation container comprises an inner core barrel (28), an outer core barrel (26) and an energy storage device (229). The outer core barrel (26) is sleeved onto the inner core barrel (28). An upper end of the inner core barrel (28) is in communication with a liquid nitrogen storage tank (225). The liquid nitrogen storage tank (225) is positioned inside the outer core barrel (26). The energy storage device (229) is in communication with the outer core barrel (26). The outer core barrel (26) is provided with a butterfly valve (23). The system facilitates preserving a core at in-situ conditions, and has an increased drilling speed, thereby enhancing core sampling efficiency.

Disclosed is a system for the in-situ retained coring of a rock sample, the system comprising a driving module (300), a retaining module (200), and a coring module (100) which are connected in sequence, wherein the coring module (100) comprises a rock core drilling tool and a rock core sample storage cylinder, the retaining module (200) comprises a rock core sample retaining compartment; the driving module comprises a coring drill machine that comprises a drill machine outer cylinder unlocking mechanism; the rock core drilling tool comprises a coring drill tool, a core catcher (11), and an inner core pipe (12); the coring drill tool comprises an outer core pipe (13) and a hollow drill bit (14); and the rock core sample retaining compartment comprises an inner coring cylinder (28), an outer coring cylinder (26), and an energy accumulator (229). The system is conducive to retaining the state of a rock core in an in-situ environment, and can improve the drilling rate and improve the coring efficiency.

Disclosed is a system for the in-situ retained coring of a rock sample, the system comprising a driving module (300), a retaining module (200), and a coring module (100) which are connected in sequence, wherein the coring module (100) comprises a rock core drilling tool and a rock core sample storage cylinder, the retaining module (200) comprises a rock core sample retaining compartment; the driving module comprises a coring drill machine that comprises a drill machine outer cylinder unlocking mechanism; the rock core drilling tool comprises a coring drill tool, a core catcher (11), and an inner core pipe (12); the coring drill tool comprises an outer core pipe (13) and a hollow drill bit (14); and the rock core sample retaining compartment comprises an inner coring cylinder (28), an outer coring cylinder (26), and an energy accumulator (229). The system is conducive to retaining the state of a rock core in an in-situ environment, and can improve the drilling rate and improve the coring efficiency.

A core drill control device is coupled to an excavator via a fixed-type mounting part and a rotation-type mounting part. The core drill control device comprises: a power button for outputting a hydraulic provision signal; a first motor button for outputting a first motor operation control signal for causing the first motor to operate; a cylinder button for outputting a cylinder operation control signal for causing the cylinder to operate; a second motor button for outputting a second motor operation control signal for causing the second motor to operate; and a control unit for controlling so that a hydraulic pressure is provided from the excavator to a core drill module depending upon the hydraulic provision signal.

A core drill control device is coupled to an excavator via a fixed-type mounting part and a rotation-type mounting part. The core drill control device comprises: a power button for outputting a hydraulic provision signal; a first motor button for outputting a first motor operation control signal for causing the first motor to operate; a cylinder button for outputting a cylinder operation control signal for causing the cylinder to operate; a second motor button for outputting a second motor operation control signal for causing the second motor to operate; and a control unit for controlling so that a hydraulic pressure is provided from the excavator to a core drill module depending upon the hydraulic provision signal.

An inner core barrel assembly incorporates an inner core tube. A body is connected to the inner core tube with a coupling mechanism. The coupling mechanism is configured to maintain a fixed rotational orientation with the inner core tube. The body includes a flow path for liquid within the inner core tube to flow as the inner core barrel assembly descends through a drill string. a core orientation system is contained within the body and positioned within the inner core tube.

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.

A subterranean formation is drilled using a drill bit of a bottomhole assembly to form a wellbore in the subterranean formation. The bottomhole assembly includes a storage chamber and sidewall coring bits. While the bottomhole assembly is disposed within the wellbore, a sidewall of the wellbore is cut into using the sidewall coring bits to obtain sidewall core samples. While cutting into the sidewall of the wellbore using the sidewall coring bits, fluid is circulated through the wellbore. The sidewall core samples are received within the storage chamber.

A subterranean formation is drilled using a drill bit of a bottomhole assembly to form a wellbore in the subterranean formation. The bottomhole assembly includes a storage chamber and sidewall coring bits. While the bottomhole assembly is disposed within the wellbore, a sidewall of the wellbore is cut into using the sidewall coring bits to obtain sidewall core samples. While cutting into the sidewall of the wellbore using the sidewall coring bits, fluid is circulated through the wellbore. The sidewall core samples are received within the storage chamber.

A drill bit includes a bit body providing a plurality of blades disposed about a centerline of the bit body, one or more primary cutters mounted at a leading face of each blade, and one or more offset cutters mounted to at least one of the plurality of blades and angularly offset from a laterally adjacent primary cutter and the leading face of the at least one of the plurality of blades.