Centralizer for casing pipe
 Drill string rod centralizer / 2260107Centralizer has rod, pivotally connected casing halves with supports and retainer adapted to fix casing halves. Casing halves are provided with flat projections. Outer faces of the projections have additional rectangular extensions. Centralizer is provided with two additional casing halves with supports, slots and grooves having characteristics corresponding to that of pivotally connected case halve projections and located transversely to jointing plane. Circumferences and diameters of the supports of pivotally connected and additional casing halves are mutually aligned. Retainers are arranged in supports of additional casing halves, retainer ends are located in pivotally connected casing halves. |
 Universal mechanical centralizing device / 2256768Centralizing device comprises body, spring-loaded centering members arranged in grooves and spaced equal distances one from another. The centering members form calibrating diameter of the device. Centering members are arranged in even or odd manner, concentrically or eccentrically one to another and installed in mating grooves directed at 4°-9° to body axis. The mating grooves converge towards device bottom. Stop nut for calibrating diameter regulation is located on outer body surface in top part thereof. Stop nut is joined with the body by left-handed connection thread and has longitudinal orifices extending along stop nut axis. U-shaped shear clips destined to prevent bottomhole assembly sticking are inserted in stop nut orifices. |
 Spherical centering turbulence promoter / 2255198Device has body in form of cylindrical bushing. Outside the body three blades are mounted symmetrically, with 120° spacing, relatively to central axis and being supports for device, providing for centering of drilling column. Blade is made of variable width with increase towards end portion, wherein rolling body in form of rubber ball is pressed. |
 Well drilling rig / 2254433Drilling rig includes drilling string located above reamer, borer with body and flushing channel. Centralizer is installed at a distance exceeding half-wave length drilling string flexure during drilling process. Centralizer is made as hinged spring-loaded blades with centering diameter corresponding to well diameter in transport position and to expanded borehole part diameter in working position. Reamer has eccentrically located rock cutting blades. Borer body is made as limiting step and is provided with stabilizing members secured to the body from side of rock-cutting blades. |
 Protector for well power cable / 2250977Protector has body of sections, made with possible mutual connection at a well. Body is made with possible mounting at an end of tubing pipes column sleeve. Sections have inner channels for interaction with tubing string, groove for driving power cable and are made with extension at outer surface. Lower section at an end is made with circular recess, and upper - with matching circular groove. Groove for driving power cable is made open in extension at an angle to body axis. In side walls of open groove, in parallel to body axis, inner grooves are made for holding power cable. |
 Protector for protection of force cable in a well / 2250345Device has body, groove for placing force cable and deflectors for interaction with operation columns inner channels. Body is made closed in form of eye, with thickened portion and channel for enveloping tubing pipe. In thickened portion a socket is made and groove is placed, made open for inserting at angle α to axis of force cable groove and its connection during screwing together of pipe and sleeve at well mouth. Width of open groove is less than force cable width. Surfaces of socket, enveloping force cable, are made with possible pressing of cable to surface of tubing pipe. |
 Protector for protection of power cable in a well / 2249668Device has body, made in form of bracket with inner dimensions for power cable and mounted on sleeve of tubing pipe through mounting rind. On ribs of body open grooves are made with side surfaces for interaction to lower end of sleeve. On the opposite side in open grooves holders are mounted for connection of protector body to mounting ring, passing through apertures of mounting ring for interaction with upper end of sleeve. Central channel in mounting ring is made with eccentricity and with size for outer diameter of tubing pipe for holding body of protector on sleeve. |
 Device for protection of power cable in a well / 2249667Device has body and groove for placement of power cable. Body is made closed, of elastic material with thickening and inner conical channel for interaction with conical thread of tubing pipe. Groove is placed on outer surface of body in parallel to its axis at its thickening and has T-like shape, which matches cross-section of power cable, for placement during mounting and holding by T-shaped groove of said power cable during its screwing together in well of next tubing pipe with sleeve. |
 Detachable protector for drilling pipe / 2244799Body of device is made in form of bushing of elastic material. Device additionally has transverse bars spaced along circle in amount no less than three, mounted in such a way relatively to bushing, that outward displacement thereof causes increase of inner passing diametric protector size, and having clamps providing for possible connection of external detachers to it, forming said displacement. Bushing and bars are provided with mutual fixing elements, preventing possibility of their relative displacement after assembling. Clamps are placed on bars within range of portions of their mutual axial overlapping with bushing, and in the latter channels are made, providing for possible connection of detachers thereto. Clamps are made on portions of bars, extending beyond bushing limits, bars are fixed in longitudinal grooves made on inner surface of bushing. Each bar has at least one boss, which is deepened into radial aperture of bushing, connecting to outer surface thereof. Clamp is made in form of threaded aperture in the boss. Bars ends extend beyond bushing ends and have shape providing for possible mounting thereof during mounting of device on drilling pipe in appropriate longitudinal grooves of hollow, made on the latter. Bars are pressed into body with possible connection of clamps to detachers. |
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Detachable protector for drilling pipe / 2244799 Body of device is made in form of bushing of elastic material. Device additionally has transverse bars spaced along circle in amount no less than three, mounted in such a way relatively to bushing, that outward displacement thereof causes increase of inner passing diametric protector size, and having clamps providing for possible connection of external detachers to it, forming said displacement. Bushing and bars are provided with mutual fixing elements, preventing possibility of their relative displacement after assembling. Clamps are placed on bars within range of portions of their mutual axial overlapping with bushing, and in the latter channels are made, providing for possible connection of detachers thereto. Clamps are made on portions of bars, extending beyond bushing limits, bars are fixed in longitudinal grooves made on inner surface of bushing. Each bar has at least one boss, which is deepened into radial aperture of bushing, connecting to outer surface thereof. Clamp is made in form of threaded aperture in the boss. Bars ends extend beyond bushing ends and have shape providing for possible mounting thereof during mounting of device on drilling pipe in appropriate longitudinal grooves of hollow, made on the latter. Bars are pressed into body with possible connection of clamps to detachers. |
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Device for protection of power cable in a well / 2249667 Device has body and groove for placement of power cable. Body is made closed, of elastic material with thickening and inner conical channel for interaction with conical thread of tubing pipe. Groove is placed on outer surface of body in parallel to its axis at its thickening and has T-like shape, which matches cross-section of power cable, for placement during mounting and holding by T-shaped groove of said power cable during its screwing together in well of next tubing pipe with sleeve. |
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Protector for protection of power cable in a well / 2249668 Device has body, made in form of bracket with inner dimensions for power cable and mounted on sleeve of tubing pipe through mounting rind. On ribs of body open grooves are made with side surfaces for interaction to lower end of sleeve. On the opposite side in open grooves holders are mounted for connection of protector body to mounting ring, passing through apertures of mounting ring for interaction with upper end of sleeve. Central channel in mounting ring is made with eccentricity and with size for outer diameter of tubing pipe for holding body of protector on sleeve. |
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Protector for protection of force cable in a well / 2250345 Device has body, groove for placing force cable and deflectors for interaction with operation columns inner channels. Body is made closed in form of eye, with thickened portion and channel for enveloping tubing pipe. In thickened portion a socket is made and groove is placed, made open for inserting at angle α to axis of force cable groove and its connection during screwing together of pipe and sleeve at well mouth. Width of open groove is less than force cable width. Surfaces of socket, enveloping force cable, are made with possible pressing of cable to surface of tubing pipe. |
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Protector for well power cable / 2250977 Protector has body of sections, made with possible mutual connection at a well. Body is made with possible mounting at an end of tubing pipes column sleeve. Sections have inner channels for interaction with tubing string, groove for driving power cable and are made with extension at outer surface. Lower section at an end is made with circular recess, and upper - with matching circular groove. Groove for driving power cable is made open in extension at an angle to body axis. In side walls of open groove, in parallel to body axis, inner grooves are made for holding power cable. |
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Well drilling rig / 2254433 Drilling rig includes drilling string located above reamer, borer with body and flushing channel. Centralizer is installed at a distance exceeding half-wave length drilling string flexure during drilling process. Centralizer is made as hinged spring-loaded blades with centering diameter corresponding to well diameter in transport position and to expanded borehole part diameter in working position. Reamer has eccentrically located rock cutting blades. Borer body is made as limiting step and is provided with stabilizing members secured to the body from side of rock-cutting blades. |
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Spherical centering turbulence promoter / 2255198 Device has body in form of cylindrical bushing. Outside the body three blades are mounted symmetrically, with 120° spacing, relatively to central axis and being supports for device, providing for centering of drilling column. Blade is made of variable width with increase towards end portion, wherein rolling body in form of rubber ball is pressed. |
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Universal mechanical centralizing device / 2256768 Centralizing device comprises body, spring-loaded centering members arranged in grooves and spaced equal distances one from another. The centering members form calibrating diameter of the device. Centering members are arranged in even or odd manner, concentrically or eccentrically one to another and installed in mating grooves directed at 4°-9° to body axis. The mating grooves converge towards device bottom. Stop nut for calibrating diameter regulation is located on outer body surface in top part thereof. Stop nut is joined with the body by left-handed connection thread and has longitudinal orifices extending along stop nut axis. U-shaped shear clips destined to prevent bottomhole assembly sticking are inserted in stop nut orifices. |
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Drill string rod centralizer / 2260107 Centralizer has rod, pivotally connected casing halves with supports and retainer adapted to fix casing halves. Casing halves are provided with flat projections. Outer faces of the projections have additional rectangular extensions. Centralizer is provided with two additional casing halves with supports, slots and grooves having characteristics corresponding to that of pivotally connected case halve projections and located transversely to jointing plane. Circumferences and diameters of the supports of pivotally connected and additional casing halves are mutually aligned. Retainers are arranged in supports of additional casing halves, retainer ends are located in pivotally connected casing halves. |
 Centralizer for casing pipe / 2260667Centralizer comprises locating member, support members and axes with friction reducing rollers arranged on the axes. Locating member is made as two locating rings. Support members are formed as resilient bars with ends connected to location rings. Resilient bars define boxes in cross-sections of medium parts thereof. Bottoms of the boxes have at least two slots to expose rollers. Roller axes are installed in orifices formed in box sides. Gap is formed between sides of resilient bar boxes and pipe to which centralizer is connected when centralizer is in unloading state. |
FIELD: oil production industry, particularly to centralize pipe strings in oil wells, namely centralizers and protectors having friction reducing rollers.
SUBSTANCE: centralizer comprises locating member, support members and axes with friction reducing rollers arranged on the axes. Locating member is made as two locating rings. Support members are formed as resilient bars with ends connected to location rings. Resilient bars define boxes in cross-sections of medium parts thereof. Bottoms of the boxes have at least two slots to expose rollers. Roller axes are installed in orifices formed in box sides. Gap is formed between sides of resilient bar boxes and pipe to which centralizer is connected when centralizer is in unloading state.
EFFECT: reduced material consumption and, as result, decreased cost of the centralizer.
2 cl, 2 dwg
The invention relates to the oil industry, namely the centering columns of pipes for oil wells, in particular to the manufacture of centralizers and protectors, in designs which reduce the frictional forces applied to the rollers.
Known protector for patent GB 2275284, publ. 21.02.1994,
The protector includes a housing consisting of two elements, compressible around the drill pipe. On the outer surface of the housing to reduce friction elements which are in contact with the inner surface of the casing. These elements made in the form of spherical, cylindrical or elliptical rollers made of miscorrection material. The rollers are installed in the sockets and are held in them due to the fact that the size of the holes in the nests of smaller dimensions of the rollers. Part of the body of each roller stands for the dimensions of the holes of the socket and in contact with the inner wall of the casing. The nest is attached to the protector case.
The disadvantages of the protector are:
substantial consumption of body protector, and hence its value.
low reliability of the design of the tread owing to the fact that when significant loads on the protector and the vibrations of the drill pipe possible expansion of the material of the edges of the holes in the sockets and the deposition of these films, that p is iveget to the output of protector of the order.
Known centralizer casing pipes according to international application WO 95/21986, publ. 14.02.1995, adopted by the applicant as an analogue of the prototype.
The centralizer includes a housing located on its surface several rows of support ribs. In the hollows between the support ribs on the axes fixed in the ribs, mounted rollers with elliptical or spherical surface that reduces friction during contact of the clamp with the wall of the casing.
The disadvantage of this centralizer is a significant consumption of its body, which increases the manufacturing cost of the centralizer.
The technical result of the claimed invention is to eliminate this drawback of the prototype, namely the reduction of the material of the centralizer and, as a consequence, the cost of production.
The technical result is achieved by the fact that the centralizer casing containing the installation element, the support elements, the axis placed on them with rollers to reduce friction, according to the invention the adjusting element is designed in the form of two rings, the bearing elements are in the form of elastic straps, the ends of which are attached to the mounting rings, elastic strap in the middle part have a box-shaped cross-section, in the bottom of the box is made of at least two slots for the rollers, the axes of the rollers are installed in the tversted, made in the sides of the box between the sides of boxes of elastic straps and a pipe which includes a centralizer, a gap in an unloaded centralizer.
In addition, the technical result is achieved in that the elastic straps have a spiral configuration relative to the longitudinal axis of symmetry of the centralizer.
The technical result is also achieved by the fact that the axis of the rollers protruding beyond the dimensions of the sides of boxes of elastic strips, rollers, reducing friction, installed in pairs on consoles axes, with elastic straps there are no grooves for the rollers.
The claimed technical solution allows to abandon the whole body of the centralizer with rollers to reduce friction. This provides a reduction in the material intensity of the centralizer and accordingly the cost of its manufacture.
The gap between the sides of boxes of elastic straps and a pipe which includes a centralizer, facilitates the installation of the clamp on the pipe. With a slight side load on the centralizer it is transmitted to the pipe via an elastic strap and mounting rings. When you increase the load on the centralizer gaps between the sides of the boxes of the elastic strips and the tube are selected and the load transmitted to the pipe through the side ducts, which increases the service life of the centralizer.
The configuration of the elastic strips spiral consider is ina longitudinal axis of symmetry of the centralizer provides the turbulization of the technological solution for cementing casing strings.
The essence of the claimed technical solution is illustrated by drawings.
Figure 1 shows a General view of the centralizer, combined with a cross section of the frontal plane.
Figure 2 shows a view of the centralizer at the top, combined with a horizontal incision along the elastic strap.
The centralizer contains the mounting ring 1, one of which threaded holes 2 under the set screws. The mounting ring 1 is attached, for example, by welding the elastic strap 3. In the middle part of the elastic strips 3 have a box-shaped cross-section. In the bottom 4 boxes are made grooves 5 to exit rollers 6. Axis 7 of the rollers 6 mounted in holes formed in the flanges 8 of the enclosure, and fastened with washers 9 and pin 10. Board 8 boxes of elastic strips 3 are fastened together by rivets 11 and spacers 12 (positions 11, 12 shown in figure 1 by Convention).
When unloaded the centralizer between the sides of boxes of elastic straps and a pipe which includes a centralizer, a gap, which is selected by increasing the load on the clamp and the load on the pipe is passed through the side ducts elastic straps.
1. The centralizer casing containing the installation element, the support elements, the axis placed on them with rollers to reduce friction, characterized in that the adjusting element is designed in the form of two ustanova the different rings, the supporting elements are in the form of elastic straps, the ends of which are attached to the mounting rings, elastic strap in the middle part have a box-shaped cross-section, in the bottom of the box is made of at least two slots for the rollers, the axes of the rollers are installed in the holes made in the sides of the box between the sides of boxes of elastic straps and a pipe which includes a centralizer, a gap in an unloaded centralizer.
2. The centralizer casing according to claim 1, characterized in that the elastic straps have a spiral configuration relative to the longitudinal axis of symmetry of the centralizer.