A method of making a fluid conduit includes at least one tubular metal fitting in fluid communication with metal tubing. The conduit is apt to be incorporated into a subsea umbilical. The fitting is made by cold-forming a workpiece in a spinning operation. The workpiece material initially has a yield strength below that of the tubing material. The invention corrects or reduces this mismatch between the yield strength of the tubing material and the initial yield strength of the workpiece material by: assessing the yield strength of the tubing material; assessing the increased yield strength of the workpiece material by virtue of the spinning operation; and before welding the fitting to the tubing, comparing the increased yield strength of the workpiece material with the yield strength of the tubing material.

A subsea control bundle umbilical comprises: a carrier pipe; a bundle of elongate functional elements being tubes and/or cables that extend longitudinally within the carrier pipe; and spacers spaced apart longitudinally along the bundle. The spacers support the functional elements of the bundle and are movable longitudinally relative to the carrier pipe upon insertion during assembly, and also during installation of the umbilical and in use. As the umbilical does not convey production hydrocarbons flowing from a subsea well, any tubes within the carrier pipe have an inner diameter of no more than 70mm. Any such tubes contain only a control fluid or a service fluid for supporting production of hydrocarbons. Each spacer comprises a stack of blocks and an opening that extends along a longitudinal axis through the spacer at an interface between abutting blocks of the stack. Each opening receives a respective elongate functional element of the umbilical.

A flat pack (1) for operating a downhole tool or sensor includes a plurality of tubes (3a, 3b); a spacer (2) disposed between the tubes (3a, 3b); and a jacket (4) encapsulating the tubes (3a, 3b) and the spacer (2). The tubes (3a, 3b) and the spacer (2) are positioned in the jacket (4) in a side-by-side arrangement. The tubes (3a, 3b) and the spacer (2) are not twisted along the flat pack (1).

A bottom hole assembly (BHA) and method for drilling a bore with a pneumatic percussion hammer includes an expandable packer surrounding the stem rod connected to the hammer. The packer has an inner surface confronting the outer surface of the stem rod in an axially slideable, sealed relationship. The packer is expanded and fixed in the bore to separate a region of high hydraulic pressure above the packer from a region of lower hydraulic pressure below the packer. The method includes operating the pneumatic hammer and bit, while (i) the stem rod advances with a sliding seal against an inside surface of the expanded packer; (ii) pneumatic pressurization and exhaust for the hammer are guided within the stem rod; and (iii) the exhaust from the hammer is discharged into the lower clearance region surrounding the bit at the bottom of the bore.

A length of coiled tubing is installed into a horizontal side-track wellbore. The coiled tubing has a pre-perforated section that defines perforations between a first end of the perforated section and a second end of the perforated section. The perforated section is positioned to align with a zone of interest within the horizontal side-track wellbore. A first isolation packer surrounds the length of coiled tubing. The first isolation packer is attached to the length of coiled tubing at the first end of the pre-perforated section. A second isolation packer surrounds the length of coiled tubing. The second isolation packer is attached to the length of coiled tubing at the second end of the pre-perforated section.

The present invention discloses a multichannel composite coiled tubing (CCT). The multichannel composite coiled tubing includes three inner pipes and an insulator, where the insulator is provided therein with a plurality of the inner pipes; the insulator is nested inside a sheath; a protective layer is welded outside the sheath; a compressive layer is welded outside the protective layer; a plurality of armored tubes are bonded to the outside of the compressive layer; a fiber layer is bonded to the outside of the armored tubes. In the present invention, the operation and test procedures are simple, the pressure is easy to measure, and a water injection additive can be easily selected to match different reservoirs. In addition, the coiled tubing is insulated, satisfying pressure transmission and logging through two cables. The compressive layer and the armored tube are convenient for extending the life of the tubing.

Methods and apparatuses are provided for clearing a wellbore using a component for milling and a component for suctioning within a wellbore. Obstructions such as ball frac seats, bridge plugs, or formation material can be milled within a wellbore. As a result, larger, unrestricted, diameters can be obtained within the liner/wellbore. The cleared wellbore can allow for various remedial tools to be run into the liner/wellbore. In addition, the milled particles can be suctioned/vacuumed up and can be pumped/pushed to surface in an underbalanced fashion. In some embodiments, this can be achieved by incorporating a bottom-hole pump or a venturi component into the bottomhole assembly. The system can be deployed using a spoolable single or multi-conduit coiled tubing system and can be configured as a well intervention or work-over technology. In some embodiments, the clearing equipment can be temporary or mobile.

Apparatus and methods for running casing into a wellbore. An apparatus may be or include a casing collar configured to couple together a first casing joint and a second casing joint. The casing collar may have a body and a plurality of rotatable members connected to the body. The body may have a fluid passage extending axially therethrough, a first coupler configured to couple the casing collar with the first casing joint, and a second coupler configured to couple the casing collar with the second casing joint. At least a portion of each rotatable member may extend from the body in a radially outward direction.

The invention relates to long-dimensional flexible tubes (coiled tubing). There are three variants of the basic channels (of an umbilical coiled tubing) proposed and all of them have two kind of the external flanges (edged or shaped ones) and include means of production. All variants include multi-stage sequential shaping process of one or multiple strips at an estimated geometry, and where isolated channels, partitions and flanges are formed during this process. If required, longitudinal butts of an additional longitude strips can be welded to them to form an umbilical coiled tubing which can be reeled up to a drum. Other types of service channels (electric, fiber-optic, capillary etc.) can be placed inside or outside channels in the form of a flexible belts. Flanges located beyond the outside dimensions of an umbilical coiled tubing may have a wave-type of form. Welding seams, flanges, centers of a closed channels and partitions are located, mainly, on the middle line of an umbilical coiled tubing's cross-section. The umbilical coiled tubing makes it possible to significantly increase possibilities of coiled tubing units in technological operations as well as in artificial lift methods due to its multi-channel design and, consequently, multifunctionality.

A downhole treatment system, apparatus, and methods are disclosed. In some embodiments a treatment apparatus includes a first conduit configured to transport a first fluid from a first fluid source through a first enclosed channel to a first outlet. A second conduit is configured to transport a second fluid from a second fluid source through a second enclosed channel to a second outlet. The treatment apparatus further comprises a mixing applicator that includes the first outlet positioned to provide a discharge path for the first fluid that at least partially intersects a flow path of the second fluid within a confluence region within or external to the second conduit.