A fidelity retaining type coring device for a rock sample, comprising a rock core drilling tool, a rock core sample storage barrel, and a rock core sample fidelity retaining cabin. The rock core drilling tool comprises a coring drilling tool, a core catcher (11), and an inner core pipe (12); the coring drilling tool comprises an outer core pipe (13) and a hollow drill bit (14), and the drill bit (14) is connected to the lower end of the outer core pipe (13); the lower end of the inner core pipe (12) extends to the bottom of the outer core pipe (13), and the inner core pipe (12) is in clearance fit with the outer core pipe (13); the rock core sample fidelity retaining cabin comprises an inner coring barrel (28), an outer coring barrel (26), and an energy accumulator (229); the outer coring barrel (26) is sleeved on the inner coring barrel (28); the upper end of the inner coring barrel (28) is communicated with a liquid nitrogen storage tank (225), and the liquid nitrogen storage tank (225) is located in the outer coring barrel (26); the energy accumulator (229) is communicated with the outer coring barrel (26); the outer coring barrel (26) is provided with a flap valve (23). According to the device, a rock core can maintain its state in an in-situ environment; in addition, the drilling speed can be increased, and the coring efficiency can be improved.

A fidelity retaining type coring device for a rock sample, comprising a rock core drilling tool, a rock core sample storage barrel, and a rock core sample fidelity retaining cabin. The rock core drilling tool comprises a coring drilling tool, a core catcher (11), and an inner core pipe (12); the coring drilling tool comprises an outer core pipe (13) and a hollow drill bit (14), and the drill bit (14) is connected to the lower end of the outer core pipe (13); the lower end of the inner core pipe (12) extends to the bottom of the outer core pipe (13), and the inner core pipe (12) is in clearance fit with the outer core pipe (13); the rock core sample fidelity retaining cabin comprises an inner coring barrel (28), an outer coring barrel (26), and an energy accumulator (229); the outer coring barrel (26) is sleeved on the inner coring barrel (28); the upper end of the inner coring barrel (28) is communicated with a liquid nitrogen storage tank (225), and the liquid nitrogen storage tank (225) is located in the outer coring barrel (26); the energy accumulator (229) is communicated with the outer coring barrel (26); the outer coring barrel (26) is provided with a flap valve (23). According to the device, a rock core can maintain its state in an in-situ environment; in addition, the drilling speed can be increased, and the coring efficiency can be improved.

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.

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 wire-line core drilling tool includes an outer barrel assembly and an inner barrel assembly. The inner barrel assembly is provided with an elastic clamp positioning mechanism, an in-place reporting and core blockage alarm mechanism, a single-action mechanism, a core barrel check valve mechanism, a core barrel and a core-breaking mechanism. The elastic clamp positioning mechanism adopts a multi-point hinged mode. The in-place reporting and core blockage alarm mechanism is integrally formed. The single-action mechanism adopts a cooperating structure of an upper polycrystalline diamond compact (PDC) bearing, a lower PDC bearing and a tungsten carbide (TC) bearing arranged in the middle. The outer barrel assembly is provided with an elastic clamp retaining head, an elastic clamp chamber, an upper reamer, an outer barrel, a lower reamer and a drill bit. A ring base is arranged, and a centralizing ring is arranged.

A wire-line core drilling tool includes an outer barrel assembly and an inner barrel assembly. The inner barrel assembly is provided with an elastic clamp positioning mechanism, an in-place reporting and core blockage alarm mechanism, a single-action mechanism, a core barrel check valve mechanism, a core barrel and a core-breaking mechanism. The elastic clamp positioning mechanism adopts a multi-point hinged mode. The in-place reporting and core blockage alarm mechanism is integrally formed. The single-action mechanism adopts a cooperating structure of an upper polycrystalline diamond compact (PDC) bearing, a lower PDC bearing and a tungsten carbide (TC) bearing arranged in the middle. The outer barrel assembly is provided with an elastic clamp retaining head, an elastic clamp chamber, an upper reamer, an outer barrel, a lower reamer and a drill bit. A ring base is arranged, and a centralizing ring is arranged.

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 core barrel sealing structure includes a core barrel, a drilling machine outer barrel, a chain mail-type flap valve and a trigger mechanism. The flap valve includes a valve seat and a chain mail-type valve flap. The trigger mechanism includes a trigger inner barrel and a trigger block. The trigger block is arranged in a through hole in a sidewall of the trigger inner barrel, and an inner wall of the drilling machine outer barrel is provided with a recessed opening adapted to the trigger block. When the core barrel is located in the valve seat, the valve flap is opened by 90° and is located between the trigger inner barrel and the drilling machine outer barrel. When the core barrel is lifted upwards, the valve flap returns to a top face of the valve seat to make sealing contact with a sealing face of a valve opening.