An apparatus for combined coring and drilling in a wellbore that includes a core drilling assembly with a coring drill head, an outer tubing for conveying forces to the drill head, an inner tubing with a lower end adapted for receiving a core sample. The apparatus further includes: a lifting device; closure elements with embedded cutting implements for cutting the core sample; and one or more controller device(s) for controlling activation and deactivation of the closure elements. The closure elements are connected to the core drilling assembly below an opening of the inner tubing such that, when in an open position the core sample can enter the inner tubing, and when in a closed position core material is cut and the cut core material is prevented from entering the inner tubing and exits to the borehole annulus via drill head openings provided in the wall of the coring drill head.

The present document relates to a piston corer for acquiring a soil sample. The piston corer comprises a sample reception cylinder for taking in and retaining the soil sample, and which comprises a piston. The piston is moveable over a piston stroke inside the sample reception cylinder. An intake opening at a first end of the sample reception cylinder allows to receive the soil sample upon penetration of the ground, and the piston is configured to move in a direction away from the intake opening during taking in of the soil sample towards an end position of the piston stroke. The piston corer further comprises an activator cooperating with a valve arranged for closing of the intake opening upon activation. The activator is configured for activating a closing action of the valve in response to the piston reaching the end position of the piston stroke. The document further relates to a method of acquiring a soil sample using such a piston corer.

The present document relates to a piston corer for acquiring a soil sample. The piston corer comprises a sample reception cylinder for taking in and retaining the soil sample, and which comprises a piston. The piston is moveable over a piston stroke inside the sample reception cylinder. An intake opening at a first end of the sample reception cylinder allows to receive the soil sample upon penetration of the ground, and the piston is configured to move in a direction away from the intake opening during taking in of the soil sample towards an end position of the piston stroke. The piston corer further comprises an activator cooperating with a valve arranged for closing of the intake opening upon activation. The activator is configured for activating a closing action of the valve in response to the piston reaching the end position of the piston stroke. The document further relates to a method of acquiring a soil sample using such a piston corer.

Core sample catchers for use with coring tools for obtaining core samples from subterranean formations may include at least one flap catcher member configured to be movably coupled to an inner barrel of the coring tool and configured to move between an open position and a closed position. A piston member including a central bore may be disposed in a passageway extending through the inner barrel. The piston member may be configured to move between a first position and a second position, the piston member configured to retain the at least one flap catcher member in the open position when the piston member is in the first position, and allow flap catcher member to move into the closed position when the piston member is in the second position.

Core sample catchers for use with coring tools for obtaining core samples from subterranean formations may include at least one flap catcher member configured to be movably coupled to an inner barrel of the coring tool and configured to move between an open position and a closed position. A piston member including a central bore may be disposed in a passageway extending through the inner barrel. The piston member may be configured to move between a first position and a second position, the piston member configured to retain the at least one flap catcher member in the open position when the piston member is in the first position, and allow flap catcher member to move into the closed position when the piston member is in the second position.

The present disclosure discloses a core holding system, comprising: a sleeve in which a cavity capable of accommodating a core is formed; an adjustment plug set comprising a plurality of adjustment plugs having grooves of different diameters, wherein any one of the adjustment plugs is dismountably connectable to the sleeve, and when the adjustment plug is mounted on the sleeve, an end of the adjustment plug having the groove is insertable into the sleeve while abutting against the core; a heating module provided to sheathe the sleeve; and a thermal insulation module provided to sheathe the heating module. Before the core is held, the operator may select a matched adjustment plug from the adjustment plug set according to a diameter of a core to be held, so that a diameter of the groove of the adjustment plug is matched with a diameter of an end of the core, thereby ensuring that the end of the core can be engaged in the groove, thus ensuring that the core holding system can stably and tightly engage the core, and preventing the held core from being shifted or loosened.

The present disclosure discloses a core holding system, comprising: a sleeve in which a cavity capable of accommodating a core is formed; an adjustment plug set comprising a plurality of adjustment plugs having grooves of different diameters, wherein any one of the adjustment plugs is dismountably connectable to the sleeve, and when the adjustment plug is mounted on the sleeve, an end of the adjustment plug having the groove is insertable into the sleeve while abutting against the core; a heating module provided to sheathe the sleeve; and a thermal insulation module provided to sheathe the heating module. Before the core is held, the operator may select a matched adjustment plug from the adjustment plug set according to a diameter of a core to be held, so that a diameter of the groove of the adjustment plug is matched with a diameter of an end of the core, thereby ensuring that the end of the core can be engaged in the groove, thus ensuring that the core holding system can stably and tightly engage the core, and preventing the held core from being shifted or loosened.

A concave section such as an extension section, a cutting section, and a notch section is provided to receive a lid of a float valve in an inside of outer tube assembly of a drill string. Thus, when the float valve is provided for the drill string, it is made possible to collect a core with a larger diameter by a thinner drill string, by expanding the inner diameter of the drill string.

Core sample catchers for use with coring tools for obtaining core samples from subterranean formations may include at least one flap catcher member configured to be movably coupled to an inner barrel of the coring tool and configured to move between an open position and a closed position. A piston member including a central bore may be disposed in a passageway extending through the inner barrel. The piston member may be configured to move between a first position and a second position, the piston member configured to retain the at least one flap catcher member in the open position when the piston member is in the first position, and allow flap catcher member to move into the closed position when the piston member is in the second position.

Core sample catchers for use with coring tools for obtaining core samples from subterranean formations may include at least one flap catcher member configured to be movably coupled to an inner barrel of the coring tool and configured to move between an open position and a closed position. A piston member including a central bore may be disposed in a passageway extending through the inner barrel. The piston member may be configured to move between a first position and a second position, the piston member configured to retain the at least one flap catcher member in the open position when the piston member is in the first position, and allow flap catcher member to move into the closed position when the piston member is in the second position.