A well tool for drilling in, cementing and completing a liner installation in a single placement. A hydraulic setting tool actuates an adapter sleeve to decouple splines forming a two-direction torque drive. The hydraulic setting tool also actuates a slips set for hanging the liner and a deformable sleeve seal. A coupling includes external splines on the hydraulic setting tool and on the upper portion of the liner. Reverse threads engage the setting tool with the upper end of the liner as well. ...

A method of obtaining a spatial model of a property of part of a subsurface formation located between underground seismic receivers in which at least two sets of pairs of seismic receivers are utilized and one pair of receivers is used to record a signal from a seimic source and obtaining a response by solving (s.sub.11(-t){circle around (x)}s.sub.21(t))=r.sub.11,21(t){circle around (x)}(s.sub.11(-t){circle around (x)}s21(t)), wherein the symbol {circle around (x)} denotes convolution and wherei...

A well screen (10) is proposed having an outer standoff layer (14) between the protective screen (15) and the filter medium (13). A method of making the well screen (10) is also proposed, comprising a step of pulling an open-ended cylinder of filter medium (13) over underlying layers (12) in the well screen (10). Furthermore, a method is proposed using series resistance welding for sealing seams in the layers making up the well screen (10).

A well barrier for separating two liquids in a gas or oil well. The well barrier includes opposing sets of laths which project slantingly away from a centrally positioned fixing device. A set of upper and lower canvas materials may be affixed to each of the sets of laths to provide enhanced sealing effect. Preferably, the laths are also positioned in an overlapping relationship to thereby minimize the overall length of the well barrier while also maintaining the required functionality.

A method for logging a well. Includes receiving energy with at least one array of elements coupled to a drill bit, wherein the at least one array of elements functions as an electronic array. An apparatus for logging a well includes a drill bit and at least one array of elements coupled to the drill bit, wherein the at least one array of elements functions as an electronic array.

A screen system for underground wells, and a method of fluid flow control and/or sand production control in a well. The screen system may include an inner screen and an outer screen having a plurality of slots. A mechanism, which may include a motor, is provided to vary the size of the said slots, and may achieve this by rotating one end of the inner screen relative to the other end. An external screen shroud may also be provided and the rotatable mechanism may be controlled by a controller coup...

Annular packer (2) arranged on the outside of a production tubing (4) said packer comprises a core (12) comprising elastic polymer swelling by absorption of hydrocarbons. The core (12) may be surrounded by an external mantle of rubber (10), which is permeable to hydrocarbons and may be equipped with a reinforcement (11). The core (12) swells by absorption of hydrocarbons and the packer (2) expands thus in order to seal the annular space (5) between the production tubing (4) and the well wall (6)...

A method and apparatus for protecting a polished rod of a pumping unit so that the portion of the polished rod that passes out of the top of a stuffing box of a wellhead on the upstroke of the polished rod is protected from the environment surrounding the wellhead. The method and apparatus also assist with containment of well fluids which may escape from the stuffing box.

A well screen is disclosed for positioning in a well bore to screen solid particles from the fluid produced by the well comprising a base pipe, a portion of the wall of which is perforated, and having threaded connections for connecting the base pipe into a pipe string, a wire screen surrounding the perforated portion of the base pipe, a thin porous membrane comprising two layers of woven cloth of ceramic fibers wrapped around the wire screen, means for holding the ends of the porous cloth membr...

A well screen (10) comprising a wire (14) spirally wrapped around a perforated base pipe (12) and spacing the perforated base pipe from a woven wire mesh filtering medium (16).