A degradable polymer composition comprises a polyurethane comprising ester groups in a backbone of the polyurethane and carboxylic acid groups attached to the backbone of the polyurethane; and a filler comprising one or more of the following: a powder comprising particles having an average particle size of about 5 microns to about 500 microns; or a fiber having an average length of about inch to about 5 inches. Also disclosed are articles comprising the composition. A method to degrade the article includes exposing the article to a fluid at a temperature of about 25 C. to about 300 C.

There is disclosed in one implementation a method of or for use in or for detecting, measuring and/or determining at least one variable or characteristic in a space, such as a well, container or vessel. In one implementation the method comprises: transmitting a first electromagnetic signal from a first position to a feature within the space; receiving a second electromagnetic signal at a second position after reflection of the transmitted first electromagnetic signal from the feature; transmitting a third electromagnetic signal from a third position to a calibration feature within the space; receiving a fourth electromagnetic signal at a fourth position after reflection of the transmitted third electromagnetic signal from the calibration feature. The method further comprises: subsequently transmitting a further first electromagnetic signal from the first portion to the feature; receiving a further second electromagnetic signal at the second position after reflection of the transmitted further first electromagnetic signal from the feature; transmitting a further third electromagnetic signal from the third position to the calibration feature; receiving a further fourth electromagnetic signal at the fourth position after reflection of the transmitted further third electromagnetic signal from the calibration feature. In so doing one can determining (the) at least one variable or characteristics from a difference or variation in time between the transmission of the first electromagnetic signal and reception of the second electromagnetic signal and the transmission of the further first electromagnetic signal and receipt of the further second electromagnetic signal and a difference or variation in time between the transmission of the third electromagnetic signal and receipt of the fourth electromagnetic signal and the transmission of the further third electromagnetic signal and receipt of the further fourth electromagnetic signal.

There is disclosed in one implementation a method of or for use in or for detecting, measuring and/or determining at least one variable or characteristic in a space, such as a well, container or vessel. In one implementation the method comprises: transmitting a first electromagnetic signal from a first position to a feature within the space; receiving a second electromagnetic signal at a second position after reflection of the transmitted first electromagnetic signal from the feature; transmitting a third electromagnetic signal from a third position to a calibration feature within the space; receiving a fourth electromagnetic signal at a fourth position after reflection of the transmitted third electromagnetic signal from the calibration feature. The method further comprises: subsequently transmitting a further first electromagnetic signal from the first portion to the feature; receiving a further second electromagnetic signal at the second position after reflection of the transmitted further first electromagnetic signal from the feature; transmitting a further third electromagnetic signal from the third position to the calibration feature; receiving a further fourth electromagnetic signal at the fourth position after reflection of the transmitted further third electromagnetic signal from the calibration feature. In so doing one can determining (the) at least one variable or characteristics from a difference or variation in time between the transmission of the first electromagnetic signal and reception of the second electromagnetic signal and the transmission of the further first electromagnetic signal and receipt of the further second electromagnetic signal and a difference or variation in time between the transmission of the third electromagnetic signal and receipt of the fourth electromagnetic signal and the transmission of the further third electromagnetic signal and receipt of the further fourth electromagnetic signal.

A subsea well system includes a safety assembly connected between a marine riser and a subsea wellhead, and an ejector bollard connected with the safety assembly and having a piston operable from a retracted position to an extended position to push an upper portion and a lower portion of the safety assembly apart and thereby physically separate the marine riser from the subsea wellhead.

A system for load transfer from a wellhead to the sea bed adjacent a subsea well, including a suction pile for securing to the sea bed, and a wellhead housing assembly having a longitudinal axis and attached to the suction pile, the wellhead housing for subjection to an axial load acting in a direction parallel to the longitudinal axis, and a bending load acting in a direction not parallel to the longitudinal axis. The system further includes a suction pile connector that transmits the axial load and the bending load from the wellhead housing through the suction pile toward the sea bed, and that is attached to the suction pile, the suction pile connector engaged with the wellhead housing to substantially maintain the relative positions of the wellhead housing and the suction pile.

A wellhead vault for preventing alteration of the wellhead of a water supply. The vault is a heavy bell-shaped structure, formed of concrete, and placed over and around the wellhead. The vaults too heavy to be removed by human lifting. Lifting elements are provided to allow the vault to be installed and removed by heavy construction equipment.

A wellhead vault for preventing alteration of the wellhead of a water supply. The vault is a heavy bell-shaped structure, formed of concrete, and placed over and around the wellhead. The vaults too heavy to be removed by human lifting. Lifting elements are provided to allow the vault to be installed and removed by heavy construction equipment.

Linear movement via a sliding mandrel configured to translate axially is converted into radial movement to compress a packer. The packer is configured to seal an item of oilfield equipment typically in a subsea environment. The packer may also be used to return or reverse the radial movement and/or the linear movement.

Linear movement via a sliding mandrel configured to translate axially is converted into radial movement to compress a packer. The packer is configured to seal an item of oilfield equipment typically in a subsea environment. The packer may also be used to return or reverse the radial movement and/or the linear movement.

Systems, methods, and software for determining properties of a medium surrounding an exterior portion of a well casing are described. In some aspects, the properties of the medium are determined based on measurements of detected acoustic energy and distances between one or more acoustic transmitters and two or more acoustic receivers. The measurements are obtained based on operating the transmitters and the receivers within a wellbore that includes the well casing.