A system includes a control block configured to be coupled to a tree of a wellhead assembly. The control block includes a housing and a plate supported by the housing and having a radially inner wall defining an opening configured to receive a tubing member extending from the tree. The control block also includes a first recess extending circumferentially about the radially inner wall of the plate and configured to support a first annular seal to facilitate sealing the tubing member within the opening while the tubing member is positioned within the opening. The control block may also include a second recess extending circumferentially about the radially-inner wall of the opening and configured to support a second annular seal.

A system includes a control block configured to be coupled to a tree of a wellhead assembly. The control block includes a housing and a plate supported by the housing and having a radially inner wall defining an opening configured to receive a tubing member extending from the tree. The control block also includes a first recess extending circumferentially about the radially inner wall of the plate and configured to support a first annular seal to facilitate sealing the tubing member within the opening while the tubing member is positioned within the opening. The control block may also include a second recess extending circumferentially about the radially-inner wall of the opening and configured to support a second annular seal.

The dual string hanger assembly includes an insert and an adaptor. The insert is installed within the inner diameter of the tubing head and the adaptor is coupled over the top of the tubing head. The insert therefore becomes sealed within the interior space between the tubing head and the adaptor. In use, the production string is supported in a tubing hanger profile built into the adaptor above the existing tubing head. The auxiliary line is supported in a second, smaller diameter hanger profile that is on the insert, which is installed within the tubing head. The assembly may include a hanging apparatus, such as slips, to secure the auxiliary line in the hanger profile of the insert.

The dual string hanger assembly includes an insert and an adaptor. The insert is installed within the inner diameter of the tubing head and the adaptor is coupled over the top of the tubing head. The insert therefore becomes sealed within the interior space between the tubing head and the adaptor. In use, the production string is supported in a tubing hanger profile built into the adaptor above the existing tubing head. The auxiliary line is supported in a second, smaller diameter hanger profile that is on the insert, which is installed within the tubing head. The assembly may include a hanging apparatus, such as slips, to secure the auxiliary line in the hanger profile of the insert.

A wellbore system includes a wellhead positioned at a well surface and capping a wellbore extending from the wellhead, and a plurality of strings of casing arranged within the wellbore and extending from the wellhead. The plurality of strings of casing include an intermediate casing, and a production casing arranged within the intermediate casing and thereby defining a casing-casing annulus between the production casing and the intermediate casing. Production tubing extends from the wellhead and is arranged within the production casing, and corrosion inhibiting diesel fluid is present within the casing-casing annulus and thereby forms a corrosion-inhibiting barrier within the wellbore.

A wellbore system includes a wellhead positioned at a well surface and capping a wellbore extending from the wellhead, and a plurality of strings of casing arranged within the wellbore and extending from the wellhead. The plurality of strings of casing include an intermediate casing, and a production casing arranged within the intermediate casing and thereby defining a casing-casing annulus between the production casing and the intermediate casing. Production tubing extends from the wellhead and is arranged within the production casing, and corrosion inhibiting diesel fluid is present within the casing-casing annulus and thereby forms a corrosion-inhibiting barrier within the wellbore.

A system, in certain embodiments, includes a casing head and a tubing hanger disposed within the casing head and supported by a first retaining feature of the casing head. The tubing hanger is configured to support a tubing string. The system also includes a guide string hanger disposed within the casing head and supported by a second retaining feature of the casing head independent of the first retaining feature. The guide string hanger is configured to support a guide string.

A system, in certain embodiments, includes a casing head and a tubing hanger disposed within the casing head and supported by a first retaining feature of the casing head. The tubing hanger is configured to support a tubing string. The system also includes a guide string hanger disposed within the casing head and supported by a second retaining feature of the casing head independent of the first retaining feature. The guide string hanger is configured to support a guide string.

A well, well head, drilling and completion system, and method for relieving pressure buildup between concentric casing annuli. The well head includes casing hangers and a tubing hanger that may include annular pressure relief conduits formed therein, which selectively vent casing annuli to the interior of the production tubing. Annular pressure relief valves are located within the annular pressure relief conduits, which may open and/or shut based on pressure, temperature, or elapsed time.

A well, well head, drilling and completion system, and method for relieving pressure buildup between concentric casing annuli. The well head includes casing hangers and a tubing hanger that may include annular pressure relief conduits formed therein, which selectively vent casing annuli to the interior of the production tubing. Annular pressure relief valves are located within the annular pressure relief conduits, which may open and/or shut based on pressure, temperature, or elapsed time.