Abstract:
An apparatus that combines mechanical scouring with hydraulic jetting action to brush and condition the internal surface of tubular structures such as well liner or casing. A liner brushing and conditioning tool comprises a mandrel (3) with male and female threaded ends (1,2) for connection to a work string, at least one brush sleeve (11) and at least two centralising sleeves (9) mounted directly onto the mandrel (3) and kept separated by means of spacer rings (10), means to allow relative rotation between the sleeves (9) and mandrel (3), and means to prevent relative rotation between the spacer rings (10) and mandrel (3).
Abstract:
The present invention provides apparatus and methods for expanding an expandable sand screen (210) in the wellbore and then fracturing the wellbore. In one aspect of the invention, an expandable sand screen includes a perforated inner pipe (240) and outer shroud (250). The outer shroud includes a plurality of longitudinal channels (260) that retain their general shape after the expandable sand screen is expanded. In the expanded state, the channels provide a fluid conduit along an area between the screen and the wall of the wellbore. In a subsequent fracturing operation, slurry travels along the conduits permitting communication of the fracturing slurry with hydrocarbon bearing formations.
Abstract:
The present invention provides apparatus and methods for completing a wellbore using expandable tubulars. In one aspect, the invention includes a tubular member (200) with an expandable portion (205) at a lower end constructed and arranged to be expanded into contact with a previously expanded liner (150). At an upper end of the tubular is a polish bore receptacle (210) permitting the tubular to be tied back to the surface of the well with production tubing (250). In another aspect, the invention provides a method of completing a well comprising expanding a liner top into a cased wellbore to hang the liner and, thereafter running a tubular member (200) into the wellbore.
Abstract:
A method of expanding tubing comprises the steps: providing a length of expandable tubing; locating an expansion tool, such as a cone, in the tubing; and applying impulses to the tool to drive the tool through the tubing and expand the tubing to a larger diameter. The tubing may be located downhole and may have a solid wall or a slotted wall.
Abstract:
A method and device for pressure sensing using an optical fiber having a core, a cladding and a Bragg grating imparted in the core for at least partially reflecting an optical signal at a characteristic wavelength. The cladding has two variation regions located on opposite sides of the Bragg grating to allow attachment mechanisms to be disposed against the optical fiber. The attachment mechanisms are mounted to a pressure sensitive structure so as to allow the characteristic wavelength to change according to pressure in an environment. In particular, the variation region has a diameter different from the cladding diameter, and the attachment mechanism comprises a ferrule including a front portion having a profile substantially corresponding to at least a portion of the diameter of the variation region and a butting mechanism which holds the ferrule against the optical fiber.
Abstract:
Methods and apparatus for filling a tubing string as it is lowered into a subterranean hydrocarbon well are described. An apparatus to fill a tubular with fluid in a wellbore comprises a housing (14,42) defining a central bore (40). An aperture (46) formed in the housing provides fluid communication between the central bore and the ambient environment of the tubing string. A piston valve (48) slidingly disposed in the housing is selectively pressure actuatable relative to the housing to control fluid communication between the central bore and the ambient environment.
Abstract:
Apparatus and method for accurately logging a drill-stem test tool into place as the DST tool is conveyed by drill pipe or tubing to the desired location are provided. One aspect of the invention provides an apparatus for logging into place a drill stem test tool, comprising: a drill string (120) comprising drill pipes or tubings (122); a drill stem test tool (128) disposed on the drill string; an electromagnetic telemetry tool (124) disposed on the drill string; and a gamma ray tool (250) connected to the electromagnetic telemetry tool. Another aspect of the invention provides a method for logging into place a drill stem test tool disposed on a drill string, comprising: lowering a drill stem test tool (128), an electromagnetic telemetry tool (124) and a gamma ray tool (250) disposed on a drill string into a wellbore; producing a partial log utilising the gamma ray tool while the drill stem test tool is moved adjacent a correlative formation marker; compare the partial log to a well log to determine a depth position adjustment; and adjust a position of the drill stem test tool according to the depth position adjustment.
Abstract:
The present invention provides a method for analysing a well completion system, wherein the method includes receiving data representative of physical characteristics of the completion system and calculating a first change in length of a tube string resulting from a helical buckling effect. The method further includes calculating a second change in length of the tube string resulting from a ballooning effect and calculating a third change in length of the tube string resulting from a slackoff force effect. Upon completion of the calculating steps, the method may output results therefrom.
Abstract:
Apparatus for connecting tubulars comprises tongs (1, 11) for gripping the tubulars, having openings (3, 13) which can be aligned to allow tubulars to enter the tongs, and a detection apparatus (15) for detecting the location of a joint between the tubulars. The detection apparatus comprises a set of keys (19) disposed along an axis substantially parallel to the axis of the tubulars, the keys being individually displaceable on contact with the tubulars as the tubulars enter the tongs through the openings. The detection apparatus further comprises a set of sensor means (22), each arranged to detect displacement of a corresponding key. The position of the joint can then be determined from the displacement of the keys.
Abstract:
The present invention provides methods and apparatus for cutting tubulars in a wellbore. In one aspect of the invention, a cutting tool having radially disposed rolling element cutter is provided for insertion into a wellbore to a predetermined depth where a tubular therearound will be cut into an upper and lower portion. The cutting tool is constructed and arranged to be rotated while the actuated cutters exert a force on the inside wall of the tubular, thereby severing the tubular therearound. In one aspect, the apparatus is run into the well on wireline which is capable of bearing the weight of the apparatus while supplying a source of electrical power to at least one downhole motor which operates at least one hydraulic pump. The hydraulic pump operates a slip assembly to fix the downhole apparatus within the wellbore prior to operation of the cutting tool. Thereafter, the pump operates a downhole motor to rotate the cutting tool while the cutters are actuated.