Abstract: A stimulus and sensor device can include a body comprising a resilient material, the body being configured to be struck by a bat, multiple light sources longitudinally spaced apart along the body, and multiple motion sensors longitudinally spaced apart along the body. A method of evaluating batting performance can include activating one of a series of light sources spaced apart along a body, and measuring motion of the body due to being struck after the activating step.

Abstract: A release tool can include an inner mandrel, an electric motor assembly, and an engagement member. The inner mandrel is displaceable by the electric motor assembly between a position in which the inner mandrel supports the engagement member and prevents separation of portions of the release tool, and another position in which the engagement member is not supported by the inner mandrel and separation of the portions of the release tool is permitted. A method of separating portions of a release tool in a well can include transmitting an electrical signal to an electrical motor assembly of the release tool, displacing an inner mandrel of the release tool in response to the transmitting, and separating the portions of the release tool after the displacing.

Abstract: A cable head can include an upper connector configured to connect the cable head to a wireline, a lower connector configured to connect the cable head to a well tool, and a weak link configured to transmit tensile force between the upper and lower connectors. The weak link can include a shock absorber connected in series with a weak point. A method of connecting a wireline to a well tool can include securing the wireline to an upper end of a weak link, and securing the well tool to a lower end of the weak link. The weak link includes a wire rope, and end links secured at respective opposite ends of the wire rope. One end link includes a weak point. A weak link for use with a cable head can include a weak point and a shock absorber connected in series with the weak point.

Abstract: A release tool can include an inner mandrel, an electric motor assembly, and an engagement member. The inner mandrel is displaceable by the electric motor assembly between a position in which the inner mandrel supports the engagement member and prevents separation of portions of the release tool, and another position in which the engagement member is not supported by the inner mandrel and separation of the portions of the release tool is permitted. A method of separating portions of a release tool in a well can include transmitting an electrical signal to an electrical motor assembly of the release tool, displacing an inner mandrel of the release tool in response to the transmitting, and separating the portions of the release tool after the displacing.

Abstract: An apparatus can include a cable head assembly with a cable head stinger connected to a weak link, and a release assembly including a bushing that radially outwardly supports a dog in engagement with an internal groove formed in an outer housing. A method can include connecting a bottom hole assembly to a wireline, the connecting including connecting the wireline to a cable head stinger of a cable head assembly; deploying the wireline and bottom hole assembly into the well; applying a tensile force to the wireline, thereby breaking a weak link of the cable head assembly; and then displacing the cable head stinger into engagement with a bushing of the release assembly, thereby permitting a dog to displace radially inwardly out of engagement with an internal groove in the release assembly.

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

Abstract: A cable head can include an upper connector configured to connect the cable head to a wireline, a lower connector configured to connect the cable head to a well tool, and a weak link configured to transmit tensile force between the upper and lower connectors. The weak link can include a shock absorber connected in series with a weak point. A method of connecting a wireline to a well tool can include securing the wireline to an upper end of a weak link, and securing the well tool to a lower end of the weak link. The weak link includes a wire rope, and end links secured at respective opposite ends of the wire rope. One end link includes a weak point. A weak link for use with a cable head can include a weak point and a shock absorber connected in series with the weak point.

Abstract: 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.

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

Abstract: An apparatus can include a cable head assembly with a cable head stinger connected to a weak link, and a release assembly including a bushing that radially outwardly supports a dog in engagement with an internal groove formed in an outer housing. A method can include connecting a bottom hole assembly to a wireline, the connecting including connecting the wireline to a cable head stinger of a cable head assembly; deploying the wireline and bottom hole assembly into the well; applying a tensile force to the wireline, thereby breaking a weak link of the cable head assembly; and then displacing the cable head stinger into engagement with a bushing of the release assembly, thereby permitting a dog to displace radially inwardly out of engagement with an internal groove in the release assembly.

Abstract: 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.