The invention relates to the introduction of pressurized fluid, e.g. acid, into a subsea well directly from a vessel (33). A fluid injection assembly (20) is fitted to the top of a subsea Xmas tree (3), the assembly (20) including fail safe closed valve (21) which is controlled via a hydraulic line (31) from the vessel. The hose and assembly and valve are designed with an internal bore allowing a large diameter ball to be dropped (required for acid stimulation). The subsea subsea control module (8) on the Xmas tree is controlled from the producing platform.

Aspects of the present disclosure relate to methods of coating a coiled tubing string, methods of conducting tubing operations using a coated tubing string, and associated apparatus thereof. In one implementation, a method of conducting a coiled tubing operation, includes forming a tubing string. The tubing string has a central annulus, an inner surface, and an outer surface, and the tubing string is formed from a metallic material. The method also includes coiling the tubing string onto a spool, and moving a coating into the central annulus. The method also includes curing the coating onto the inner surface of the tubing string to form a layer of the coating on the inner surface of the tubing string.

A method of determining a drilling activity includes receiving a set of measurements at different times. The set of measurements includes a depth of a wellbore, a depth of a drill bit, and a position of a travelling block. The method also includes identifying a connection by determining when the position of the travelling block changes but the depth of the drill bit does not change. The method also includes determining when the depth of the wellbore does not increase between two different connections. The method also includes determining a direction that the drill bit moves between the two connections.

A method for joining metallic well tubulars to be lowered into a wellbore (4) comprises the steps of: a) providing a first well tubular (6) having an upper end surface (6a), and a second well tubular (7) having a lower end surface (7a); b) lowering the first well tubular (6) into the wellbore (4), leaving the upper end thereof outside the wellbore (4); c) setting the second well tubular (7) in an axially aligned position on the first well tubular (6), with the lower end surface (7a) of the second well tubular (7) set against the upper end surface (6a) of the first well tubular (6); d) keeping the first and second well tubulars (6, 7) in said axially aligned position; e) welding the upper end of the first well tubular (6) to the lower end of the second well tubular (7), forming a circumferential weld bead (WL) in a position corresponding to said upper and lower end surfaces (6a, 7a); and f) lowering into the wellbore (4) the first well tubular (6) and the second well tubular (7) welded together. Step e) comprises the operations of: providing at least one laser welding head (13), configured for directing a laser beam (LB) towards a circumferential working zone (WA) that includes an upper end portion of the first well tubular (6) and a lower end portion of the second well tubular (7), the at least one laser welding head (13) being displaceable around the circumferential working zone (WA) according to a respective trajectory of revolution; providing at least one induction-heating device (141, 142), which is displaceable substantially according to the trajectory of revolution of the at least one laser welding head (13), the at least one induction-heating device (141, 142) being set upstream, respectively downstream, of the at least one laser welding head (13), with reference to the direction of revolution (R) of the at least one laser welding head (13); causing revolution of the at least one laser welding head (13) and revolution of the at least one induction-heating device (141, 142), in such a way that: the laser beam (LB) progressively forms the circumferential weld bead (WL); and the at least one induction-heating device (141, 142) supplies heat to a corresponding part (PH1, PH2) of the circumferential working zone (WA), which comprises respective parts of said upper and lower end portions of the respective first and second well tubulars (6, 7), before the laser

A method for joining metallic well tubulars to be lowered into a wellbore (4) comprises the steps of: a) providing a first well tubular (6) having an upper end surface (6a), and a second well tubular (7) having a lower end surface (7a); b) lowering the first well tubular (6) into the wellbore (4), leaving the upper end thereof outside the wellbore (4); c) setting the second well tubular (7) in an axially aligned position on the first well tubular (6), with the lower end surface (7a) of the second well tubular (7) set against the upper end surface (6a) of the first well tubular (6); d) keeping the first and second well tubulars (6, 7) in said axially aligned position; e) welding the upper end of the first well tubular (6) to the lower end of the second well tubular (7), forming a circumferential weld bead (WL) in a position corresponding to said upper and lower end surfaces (6a, 7a); and f) lowering into the wellbore (4) the first well tubular (6) and the second well tubular (7) welded together. Step e) comprises the operations of: providing at least one laser welding head (13), configured for directing a laser beam (LB) towards a circumferential working zone (WA) that includes an upper end portion of the first well tubular (6) and a lower end portion of the second well tubular (7), the at least one laser welding head (13) being displaceable around the circumferential working zone (WA) according to a respective trajectory of revolution; providing at least one induction-heating device (141, 142), which is displaceable substantially according to the trajectory of revolution of the at least one laser welding head (13), the at least one induction-heating device (141, 142) being set upstream, respectively downstream, of the at least one laser welding head (13), with reference to the direction of revolution (R) of the at least one laser welding head (13); causing revolution of the at least one laser welding head (13) and revolution of the at least one induction-heating device (141, 142), in such a way that: the laser beam (LB) progressively forms the circumferential weld bead (WL); and the at least one induction-heating device (141, 142) supplies heat to a corresponding part (PH1, PH2) of the circumferential working zone (WA), which comprises respective parts of said upper and lower end portions of the respective first and second well tubulars (6, 7), before the laser

A wellbore surface assembly includes a slip assembly, vertical rails, linear actuators, and an iron roughneck. The slip assembly is attached to a floor surface of a wellbore and it includes movable slips that engage a first tube. The vertical rails are attached to the base of the automatic slip assembly. The iron roughneck is movable along the vertical rails. The automatic iron roughneck includes a frame, a rotary ring, die actuators, and dies. The iron roughneck is movable by the linear actuators along a length of the vertical rails, changing an elevation of the iron roughneck with respect to the automatic slip assembly and the floor surface of the wellbore. The dies engage the second tube and the rotary ring rotates the second tube, threadedly attaching or detaching the second tube from the first tube.

An improved coupling for joining pipes of characteristics in accordance with API standards provides for the extraction of crude oils from oil wells, whose improved characteristics, according to the new procedure, achieve a hermetic design of the coupling and, more specifically, relate to the improvement of the threading in the joints by means of modern systems for the fabrication thereof in both the pipe terminals of the well and in the joining of the rounded threads, with computerised rnanufactuting systems and with the incorporation of a shoulder located interiorly in the coupling to achieve, first, the elimination of free spaces that might cause turbulence within the coupling, and second, to create a hermetic metal-to-metal closure and additionally a flexible hydrogenated nitrogen seal, located behind the shoulder, ensuring the hermetic nature of the joint.

An improved coupling for joining pipes of characteristics in accordance with API standards provides for the extraction of crude oils from oil wells, whose improved characteristics, according to the new procedure, achieve a hermetic design of the coupling and, more specifically, relate to the improvement of the threading in the joints by means of modern systems for the fabrication thereof in both the pipe terminals of the well and in the joining of the rounded threads, with computerised rnanufactuting systems and with the incorporation of a shoulder located interiorly in the coupling to achieve, first, the elimination of free spaces that might cause turbulence within the coupling, and second, to create a hermetic metal-to-metal closure and additionally a flexible hydrogenated nitrogen seal, located behind the shoulder, ensuring the hermetic nature of the joint.

A drilling mud screen comprising: a body having a first end and a second end and a centerline, wherein the first end and/or the second end of the body has a means to engage a drilling mud screen puller/installer tool; a drilling mud inlet at the first end of the body; a filter having a first end, a second end, and openings, wherein the filter is fluidly connected to the second end of the body via a first connection and/or an optional first end retaining ring; a drilling mud outlet at the openings of the filter; and a second end cap fluidly connected at the second end of the filter via a second connection, wherein the filter has an optional retaining ring disposed between the first connection and the second connection is disclosed.

A drilling mud screen comprising: a body having a first end and a second end and a centerline, wherein the first end and/or the second end of the body has a means to engage a drilling mud screen puller/installer tool; a drilling mud inlet at the first end of the body; a filter having a first end, a second end, and openings, wherein the filter is fluidly connected to the second end of the body via a first connection and/or an optional first end retaining ring; a drilling mud outlet at the openings of the filter; and a second end cap fluidly connected at the second end of the filter via a second connection, wherein the filter has an optional retaining ring disposed between the first connection and the second connection is disclosed.