Downhole equipment centraliser

FIELD: oil and gas production.

SUBSTANCE: downhole equipment centraliser comprising a hollow rod with a socket end, a coupling, a cylinder, a piston pusher and rams partially radially movable forward when travelling along the tapered case. Besides the coupling is provided from beneath; from the top, the hollow rod is equipped with a landing seat, and the cylinder wherein all the movable elements are provided, comprises ram windows and seats between the coupling and the landing seat while being designed to rotate and join a centre tube of the hollow rod; the tapered case is rigidly connected with the piston pusher spring-assisted from beneath to travel longitudinally downwards and rotate about the hollow rod.

EFFECT: rigid and reliable centering of the downhole equipment in the required interval.

3 dwg

 

The proposal relates to the oil and gas industry, namely, devices for centering of downhole equipment.

The famous "Centralizer casing" (patent RU №2209921, EV 17/10, publ. bull. No. 22 of 10.08.2003 year), including located on the casing cylinder, shear tube that tells the cylinder chamber with nutricology, the piston, the centering elements, and the cylinder is rigidly connected with the casing, a piston in the lower part is made conical, and centering elements are in the form of a split petal conical sleeve having on the outer side along the perimeter of the groove, the cylindrical portion of the tapered sleeve is rigidly connected to the casing, and the lower tapered portion of the piston is installed with the opportunity to interact with split petals taper sleeve. In addition, the piston is made with a longitudinal slot.

The disadvantage of this device is the lack of a return mechanism of the centering elements in the source transport position, which can lead to jamming and emergencies. In addition, there is no possibility of rotation of the centering elements with respect to the casing, which creates additional resistance in the process.

The closest in technical essence and the achieved result is the Centralizer b the oxidation of sulfhydryl tool (patent RU №2151853, EV 17/10, publ. bull. No. 18 of 27.06.2000 g)containing the coupler, which is connected to the hollow rod, the cover plates are installed with the possibility of moving the cone-beam case, the sub hydraulic channels and the cylinder, piston plunger, rubber ring, four screws, cuff, steel compression rings and Shoe, and before entering the hydraulic channels welded lights with holes, inside of which is placed a Teflon balls, and the piston-plunger is cut into four parts according to the number of dice of the centralizer.

The disadvantage of this device is that the centering elements in the process of drilling tool rotates with the column of drill pipe, which creates additional resistance and vibration during operation and reduces the service life of the dies of the centralizer. Consequently, the accuracy of direction centered equipment at work (e.g., dilator in the extension of the wellbore). In addition, during descent of the tool in a given interval of possible spontaneous output of the centering elements in operating position, as they are not recorded in the transport position, which can lead to jamming and emergency situations.

The technical objective of the proposed centralizer is to provide a reliable high resource device, the quarter is found in the required interval, providing accurate rigid centering with a uniform force distribution and, as a consequence, the exact direction of movement of the downhole equipment and the reduction of vibrations.

The technical problem solved by the centralizer of downhole equipment, comprising a hollow shaft with the clutch cone housing, cylinder, piston-plunger and die made with the possibility of a limited radial extension when moving the cone-beam case.

What's new is that the clutch is on the bottom, a hollow stem on the top is equipped with stops, and a cylinder which contains all moving parts, equipped with the Windows under the die and is installed between the clutch and it stops with the possibility of rotation and is in communication with the Central channel of the hollow shaft, while the tapered housing is rigidly connected with the spring loaded bottom of the piston-plunger with the possibility of longitudinal movement down and rotation relative to the hollow rod.

Figure 1 shows the centralizer of downhole equipment, General view of the axial section in the transport position, figure 2 - General view of the axial section in the working position, figure 3 - cross section a-A.

The centralizer downhole equipment includes a hollow shaft 1 (see Fig 1 and 2), above, is equipped with a stop 2, a conical housing 3, plate 4, made with limited radial extension when moving the cone-beam case 3 nahodyaschiysya with him in engagement through a "dovetail" 5. Conical housing 3 is rigidly connected preloaded with bottom spring, 6 piston-plunger 7. The hollow rod 1 from the bottom is connected with the coupling 8, and between the stop 2 and the sleeve 8 rotatably located cylinder 9, is equipped under 10 die 4. For the transmission of hydraulic pressure on the piston-plunger 7 in the hollow shaft 1 has a hole 11. To connect with the pillar drill pipe and centered downhole equipment (not shown) the centralizer has a thread 12. The return of the dies 4 and of the piston-pusher 7 in the original transport position occurs through the force of the spring 6 through the pushers 13 (see figure 2), rigidly connected to the conical housing 3.

The centralizer downhole equipment operates as follows. The centralizer is placed directly in front of downhole equipment (extender, resultevent and others not shown) by means of connecting threads 12 (see figure 1). Then on the string of drill pipe of the downhole equipment together with centralizer descend at a given interval in which you want to make the expansion of the wellbore (not shown), a flare or other operations. When this die 4 centralizer hidden in boxes of 10 of the cylinder 9 and do not touch the walls of the borehole due to the force of the spring 6.

After that inside of the drill pipe with the drill is the first pump serves washing liquid and start to rotate the string of drill pipe and downhole equipment. Through the hole 11 in the hollow rod 1 hydraulic fluid transmits the pressure to the piston-plunger 7, is rigidly connected to the conical housing 3, through the "swallow's tail" 5 die set 4. Compressing the spring 6 through the pushers 13 (see figure 2), the piston-plunger 7 performs a longitudinal movement down to the limited compression spring 6 distance, thereby bringing the plate 4 (see figure 3) due to the conical housing 3 at a certain distance in the radial direction, firmly aligning thereby downhole tool relative to the axis of the borehole during operation. The cylinder 9 (see figure 2)in which all movable elements located between the stop 2 of the hollow shaft 1 and the sleeve 8 to rotate relative to the hollow rod 1. As a result of this centering elements do mainly translational motion, rotation of the cylinder 9 is missing due to the presence of friction plates 4 in the borehole, allowing them to remain stationary relative to the walls of the borehole, thereby preventing wear of the dies 4 and increasing the life of the centralizer in General. Once developed the specified interval of the well, the mud pump is shut down, the pressure is released, and the spring 6 returns the die 4 (see figure 1) with a conical housing 3 and the piston-plunger 7 in the original transport polojeniyem tool to raise the wellhead.

This design provides a rigid and reliable centering of the downhole equipment in the required interval, excluding unauthorized actuation, vibration and vibration of this equipment during downhole operations, which together allows quality all work with high working resource of the device.

The centralizer of downhole equipment, comprising a hollow shaft with the clutch cone housing, cylinder, piston-plunger and die made with the possibility of a limited radial extension when moving the cone-beam case, characterized in that the clutch is on the bottom, a hollow stem on the top is equipped with stops, and a cylinder which contains all moving parts, equipped with the Windows under the die and is installed between the clutch and it stops with the possibility of rotation and is in communication with the Central channel of the hollow shaft, while the tapered housing is rigidly connected with the spring loaded bottom of the piston-plunger with the possibility of longitudinal movement down and rotation relative to the hollow rod.



 

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Blocking assembly // 2247221

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FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas producing industry, particularly to devices for attaching process facilities of external equipment to pipe string lowered into well. The stop devise consists of a coupling in form of a ring with internal circular groove and radial openings for receiving a stop element into the groove; the stop element is made in form of a one-side wedge with fixing ribs triangular in cross section. Also in cross section the circular groove of the coupling is made in form of arc and exceeds in width the radial opening located in the middle of the groove. Surface, opposite to inclined plane of the wedge, in cross section is made in form of arc with radius smaller, than radius of the circular groove of the coupling to a value from 2 to 5 %. The stop wedge has a recess at a thickened end of the wedge with an arc-shaped in section side; width and length of the side do not exceed 20% of corresponding dimensions of the wedge. Radial openings for insertion into the groove of the stop element coupling are cut at 45÷90° to a generating line of external surface of the coupling.

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4 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: centraliser for additional casing string cementation inside of a main casing string, includes cylindrical case with blades, fixed with fixers on its surface and equipped with top and bottom cants. The cylindrical case executed as a pipe of the additional casing string, and fixers as a top and a bottom rings with conical external surfaces, interacting with blades cants and stiffly fixed on the pipe. The centraliser manufacturing method includes the cylindrical case with blades manufacture, and its installation between sleeves as a part of the additional casing string, at that the cylindrical case made as a pipe of the additional casing string, and install blades with the top and bottom cants on the pipe surface, clamping blades cants from the top and the bottom with the fixer rings conical surfaces, which are stiffly fixed on the cylindrical case surface, after that fix it between the additional casing string pipes. The centralizer for additional casing string centralising inside of a main casing string and its manufacture method allows decrease metal consumption, because the pipe of the additional casing string used as the cylindrical case, and centralizers crosscut profile area decrease allows to use them as a part non-sleeved additional casing string , keeping well pas through diametre at a large.

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2 cl, 2 dwg

FIELD: mechanics.

SUBSTANCE: invention refers to support and centering devices used in arrangement of drill column bottom at directed drilling of oil and gas wells. Well shaft calibrator includes upper and lower connection thread, internal channel for feeding flushing liquid to bottomhole, three or more blades with reinforced working surfaces separated from each other with flushing slots, and blade length L in it is related to working diametre of calibrator Dc with the following ratio: L/Dc=(0.7÷0.95). As reinforcing material for blades there used are plates made of polycrystalline diamonds (PDC) with flat external surface, which are installed flush with operating surface, and total area of reinforcing plates S1 is related to operating blade area S2 with the following ratio: S1/S2=(0.34÷0.48). External flushing channels between blades are uniformly extended along sectional area due to inclination of leading cutting edge at an angle α=(18°÷23°) clockwise to generatrix of calibrator cylindrical part, and trailing edge is made along generatrix of cylindrical part; at that, there provided is ratio of areas of space between bottom of channel and overall line of calibrator at channel outlet S4 and at channel inlet S3 within the following limits: S4/S3=(1.37÷1.52). Curved surface of flushing channels is smooth without passages and protrusions with unevenness Ra=(1.0÷4.0) mcm.

EFFECT: increasing manoeuvrability at drift angle of well, decreasing packing at directed drilling of viscous and sticky rocks.

4 cl, 4 dwg

FIELD: oil-and-gas production.

SUBSTANCE: invention related to casing string hole clearance cementing , particularly cementing casing string in a well. Hydro-mechanical anchor centraliser, includes cylinder connected to string, inside which installed 3 barrels, working piston, fixed relatively to cylinder with calibrated pin, slide barrel, centralising arms, roller fixed with string, lockers, executed as a T-shaped channels on the barrels bottom, interacting with T-shaped pins, stiff fixed with centralising arms. Slide barrel installed inside cylinder cavity over barrels. External diametre of slide barrel is smaller than cylinder internal diametre. External surface of working piston bottom part made conical for interaction with centralising arms conical surfaces. On the top part of working piston before its conical surface made diametrically opposed gaps, in a way that its bottom part has radial through pins, created along working piston generating line in pins between centralising arms. Core stepped created along external working surface has radial holes with thread, connecting cylinders and core internal surfaces, destroyable plug threaded in it.

EFFECT: anchor centraliser reliability increase and its simplification.

3 dwg

FIELD: oil-and-gas production.

SUBSTANCE: invention related to casing string hole clearance cementing , particularly cementing casing string in a well. Hydro-mechanical anchor centraliser, includes cylinder connected to string, inside which installed 3 barrels, executed as half barrels, connected in pair with each other via seals, working piston, installed under barrels and executed as half barrels, stiff fixed in a conical part, centralising arms, roller fixed with string, lockers, executed as a T-shaped channels on the barrels bottom, interacting with T-shaped pins, stiff fixed with centralising arms top ends, destroyable plug, installed in radial hole with thread, connecting internal cavities of cylinder with string, stepped executed along its external working surface, slide barrel with conical external surface on its top part for interaction with cylinder internal conical surface and radial hole, located under conical surface, installed over barrels and on bigger diametre of the string inside cylinder internal cavity with possibility of radial hole closing with it after anchor centraliser actuation and executed along external diametre, less tha cylinder internal diametre, and actuation, fixed relatively to cylinder working barrel, and on the bottom part of working barrel along generating line radial pins executed in gaps between centralising arms.

EFFECT: anchor centraliser reliability increase.

4 dwg

FIELD: oil-and-gas production.

SUBSTANCE: group of inventions related to oil-and-gas production, particularly to pump stem centralising guiding devices. Stem guide consist of case, made of two connecting elements and sleeve, located around first and second case elements in stem pick up position between loaded arms of the first and second case elements arms. Also first and second case elements have external wear surface for sliding contact with sleeve internal wear surface, and at least one external and one internal accordingly for the first and second elements conical surfaces, narrowing radially along axes for loking to each other during device case installation on the pump stem core.

EFFECT: efficiency increase in device connection to pump stem and enhancement.

27 cl, 9 dwg

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