A fishing neck for a plunger comprises a head portion, a neck portion, a lower portion, and a plurality of ribs. The head portion has a cylindrical configuration with an outer peripheral surface and an outer diameter. The neck portion also has a cylindrical configuration with an outer peripheral surface and an outer diameter, but the outer diameter is less than the outer diameter of the head portion. The neck portion extends from the head portion. The lower portion extends from the neck portion, which is opposite the head portion, and is connectable to a plunger. The lower portion has an outer diameter greater than the outer diameter of the neck portion. A plurality of ribs projects from the outer peripheral surface of the neck portion and extends helically from the head portion to the lower portion.

A fishing neck for a plunger comprises a head portion, a neck portion, a lower portion, and a plurality of ribs. The head portion has a cylindrical configuration with an outer peripheral surface and an outer diameter. The neck portion also has a cylindrical configuration with an outer peripheral surface and an outer diameter, but the outer diameter is less than the outer diameter of the head portion. The neck portion extends from the head portion. The lower portion extends from the neck portion, which is opposite the head portion, and is connectable to a plunger. The lower portion has an outer diameter greater than the outer diameter of the neck portion. A plurality of ribs projects from the outer peripheral surface of the neck portion and extends helically from the head portion to the lower portion.

A method and system for obtaining orientation of a core sample core drilled from underlying rock. A core orientation recording device (116) records its orientation at random and/or non-predetermined time intervals from a reference time during a drilling operation. The time intervals are generated to be within a range of minimum and maximum time intervals. After a time interval elapsed from the reference time plus a wait time of at least the minimum random or non-predetermined time interval, the core sample is separated from the underlying rock and brought to the surface and its original orientation is determined from orientation data recorded closest in time to the elapsed time plus the minimum time interval. A remote communicator (160) having the elapsed time interrogates the core orientation recordal device (116) to identify the required orientation data and requires the core orientation recordal device to identify a correct orientation of the core sample.

A method and system for obtaining orientation of a core sample core drilled from underlying rock. A core orientation recording device (116) records its orientation at random and/or non-predetermined time intervals from a reference time during a drilling operation. The time intervals are generated to be within a range of minimum and maximum time intervals. After a time interval elapsed from the reference time plus a wait time of at least the minimum random or non-predetermined time interval, the core sample is separated from the underlying rock and brought to the surface and its original orientation is determined from orientation data recorded closest in time to the elapsed time plus the minimum time interval. A remote communicator (160) having the elapsed time interrogates the core orientation recordal device (116) to identify the required orientation data and requires the core orientation recordal device to identify a correct orientation of the core sample.

A fishing tool (1) configured to retrieve a fish (100) from a wellbore, having a fish engagement arrangement (3) with fish engagement means (5) configured to lock the fishing tool to the fish inside a well. The fishing tool (1) has an electrically actuated fish disengagement arrangement (4), which is configured to unlock the fishing tool from the fish, wherein the fish disengagement arrangement (4) comprises an electric actuator (13). The fish disengagement arrangement (4) comprises a direct mechanical force link (6) between the electric actuator (13) and the fish engagement means (5), wherein the direct mechanical force link is configured to connect a mechanical force from the electric actuator (13) to the fish engagement means (5).

A fishing tool (1) configured to retrieve a fish (100) from a wellbore, having a fish engagement arrangement (3) with fish engagement means (5) configured to lock the fishing tool to the fish inside a well. The fishing tool (1) has an electrically actuated fish disengagement arrangement (4), which is configured to unlock the fishing tool from the fish, wherein the fish disengagement arrangement (4) comprises an electric actuator (13). The fish disengagement arrangement (4) comprises a direct mechanical force link (6) between the electric actuator (13) and the fish engagement means (5), wherein the direct mechanical force link is configured to connect a mechanical force from the electric actuator (13) to the fish engagement means (5).

A releasable tool using an electronic motor to drive a collet and associated collet arms to engage or release a quick change sub that may be coupled to additional downhole tools, such as a perforating gun string.

A releasable tool using an electronic motor to drive a collet and associated collet arms to engage or release a quick change sub that may be coupled to additional downhole tools, such as a perforating gun string.

A latch tool for a wireline toolstring includes an anchor assembly that is attached to a support structure. A core assembly is configured for axial movement relative to the anchor assembly. The anchor assembly and the core assembly provide a spring chamber having a length that changes with axial movement of the core assembly. A spring opposes axial movement of the core assembly. A latch assembly includes at least one latching element that captures a coupling component. The spring provides a bias force that opposes axial movement of the core assembly in a latching direction, but permits axial movement of the core assembly in the latching direction when an axial force applied to the core assembly exceeds the bias force.

The present invention relates to a wireline retrieval head assembly and downhole tool, the wireline retrieval head assembly for coupling to the downhole tool for installation in and retrieval from downhole in a mineral industry field of use, wherein a first of the wireline retrieval head assembly and downhole tool has a retention member that has or is configured to receive a pivot member and a second of the wireline retrieval head assembly and downhole tool has a complementary link with an opening for receiving the pivot member, such that the link can be coupled to the retention member to create a pivot coupling to allow for articulation between the wireline retrieval head assembly and the downhole tool during installation and retrieval of the downhole tool, and the link can be removed from the retention member to remove the downhole tool from the wireline retrieval head assembly.