UA75999C2 - Appliance for unloading weight of drive pipe at its sectional fixation - Google Patents

Abstract

The appliance for unloading weight of drive pipe at its sectional fixation has hollow body, pressed by springs slip sockets, the unit of the slip socket drive, stoppers of the slip sockets with respect to the body and slot plug in the cavity of which bearing rod is placed with washing windows. To the base of the slot plug support substitute is connected, with circular reboring and restrictor installed in radial position. The bearing rod with washing windows is held in the upper end position by safety expanding ring. The washing windows of the bearing rod are from inside hermetically closed with movable plug with variable cross-section with radial sockets with spherical stoppers in those, radial displacement of those ones is restricted by the inner wall of the support substitute and the outer circular reboring of the stepped lock shell, this is installed in free way in the inner cavity of the movable bushing with variable cross-section. At that the unit of the slip socket drive is arranged as a disc pusher installed without possibility of motion on bearing rod, and movable in axial direction cylindrical pins are installed to vertical openings of the body for interaction with the stoppers of the slot sockets and are fixed in the body by stopper screws deepened to guiding slots.

Description

Description of the invention

The invention relates to the oil and gas production industry, in particular, to the sectional fastening of the borehole 2 of any given trajectory with uniform unloading of the weight of the casing pipe column on the inner wall of the intermediate column.

A well-known device for sectional fastening of a wellbore (patent of Ukraine Mo54493, IPK 7 E 21 B 23/00, 43/10, publ. 17.03.200Zr., Byul. Mo3)|, which includes a body made in the upper part in the form of a truncated pyramid . , a hollow cylinder, a sleeve pusher, which is hinged to the hollow cylinder, a transport plug, which is temporarily held in the hollow cylinder by retaining balls with an elastic ring and consists of a cylindrical seat with an internal annular projection, a reset plug with an annular stop 12 and longitudinal grooves in its middle part, a stop socket ring with longitudinal slots and installed above the shoe valve, as well as a joint an assembly located at the base of the upper section of the column and holding a smooth connecting bell, an outer cone with radial windows, and a cut-off with an inner cone.

The disadvantage of this device is the lack of a straight-flow channel for pushing the tamponage solution and the insufficient area of the channel in the transport plug, because in it the outflow of the solution is carried out through radial channels, which leads to an increase in the time of fixing the well, in addition, it is necessary to spend additional time on the threaded connection connection of the drill string from the lower section of the casing pipes to remove excess mud, which can lead to its premature setting.

The device for unloading the weight of a column of pipes is closest to the proposed one in terms of technical essence and the result achieved (patent of Ukraine Mo45595, IPC 7 E 21 B 23/00, E 21 B 23/00, publ. 07/15/2003. (IN

Bul. Mo7|, containing a cylindrical (hollow) body, made in the upper part in the form of a truncated pyramid, spring-loaded (pressured by springs) slip dies installed on the pyramidal faces of the body with the possibility of longitudinal movement, a unit for driving the dies in the form of a hollow cylinder with a sleeve pusher, which is installed with the possibility of axial movement, and the retainers of the dies relative to the body in their lowest position, while the device is equipped with a supporting rod with washing windows in its upper part F) and with a left external slot, connected to it by a hollow cylinder with external slots , which is telescopically connected to a splined plug installed in the body using the left bearing thread, with a bearing assembly fixed on the supporting rod with the help of a support adapter, while the cylindrical body at the base is made with a conical heel of the springs of the splicing dies , the latches of which interact with spring-loaded (cylindrical) fingers that have recesses, the sleeve pusher of the die drive unit is connected by a latch to the hollow cylinder.

The disadvantage of this device is that the unloading of the weight of the lower section of the casing string onto the inner wall of the intermediate column, as well as the opening of the wash windows of the supporting rod, is carried out during the rotation of the drill string under the weight load of the lower section of the casing string, which creates excessive resistance to rotation, which can 70 lead to such a complication as premature setting of the tamponade solution due to the significant time spent on general technical preparation and opening of the washing windows, which significantly reduces the reliability of the device and

From" the quality of casing string fastening.

The task of this invention is to increase the reliability of the device and the quality of the casing string fastening due to the exclusion of the rotation of the drill string under load when fixing the lower section and opening the flushing windows. and To solve the given problem, a device is proposed for unloading the weight of the casing string when it is 4! sectional fastening, containing a hollow body, made in the upper part in the form of a truncated pyramid with a conical spring support at the base, tie dies pressed by springs, which are installed on the pyramidal faces of the body with the possibility of their longitudinal movement, the drive unit of the tie dies in (Te ) 20 in the form of a pusher, the retainers of slip dies relative to the body in their lowermost position, which interact with cylindrical fingers that have recesses, a splined plug installed in the body with the help of a left bearing cut, in the cavity of which there is a bearing rod with washing windows and telescopically connected by splines with a splined plug, according to the invention, to the base of the splined plug, which is made with an internal ring boring, a support adapter with a ring boring is attached and a radial 25 is installed with a limiter, the supporting rod with the washing windows is held in the upper extreme position

GF) with a safety compression ring sunk into the corner groove of the supporting rod, the washing windows of the supporting rod are hermetically covered from the inside by a movable sleeve of variable cross-section with radial sockets containing spherical retainers, the radial movement of which is limited by the inner wall of the support guide and the outer annular groove of the stepped lock sleeve, which is freely installed in the inner cavity of the movable bushing 60 of variable cross-section, while the unit for driving the slip dies is made in the form of a disc pusher, mounted stationary on the supporting rod and fixed with screws with shear elements that hold the movable bushing in the inner cavity of the supporting rod, and movable in the axial direction, cylindrical fingers with recesses and longitudinal guide grooves are installed in the vertical holes of the housing for interaction with the retainers of slip dies and are fixed in the housing with locking screws recessed in the guide grooves. because Fig. 1 shows a device for unloading the weight of the casing column during its sectional fastening (further -

device) with the lower section of the casing column in the initial position, general view;

In Fig. 2 - the device at the moment of engagement of slip dies with the inner wall of the intermediate column;

Fig. 3 shows the device after opening the washing windows;

In Fig. 4 - the device before docking with the upper section of the casing column;

Fig. 5 - section AA in Fig. 1;

Fig. 6 - cross-section B-B in Fig. 3;

Fig. 7 shows the remote element B in Fig. 3.

The device consists (see Fig. 1) of a hollow body 1, made in the upper part in the form of a 7/o truncated pyramid with a conical heel of springs 2 at the base, pressed by springs From slip dies 4 installed on the pyramidal faces of the hollow body 1 with with the possibility of their longitudinal movement, the assembly of the drive of slip dies 4, made in the form of a disk pusher 5, mounted stationary on the supporting rod b and fixed with screws 7 with shear elements 8, movable in the axial direction of cylindrical fingers 9 with recesses 10 and longitudinal guiding grooves 11, installed in 7/5 Vertical holes 12 of the hollow body 1 for interaction with the retainers 13 of the slip dies 4 relative to the hollow body 1 in their lowest position, while the cylindrical fingers 9 are fixed in the hollow body 1 with locking screws 14, recessed in the guide grooves 11.

The hollow body 1 is made with a left internal slot 15, interacting with a slotted plug 16, in the cavity of which there is a supporting rod 6 with washing windows 17, telescopically connected by slots 18 to a slotted plug 16. A support conductor 20 is attached to the base of the slotted plug 16 with a slot 19 with an annular boring 21 and a radially installed limiter 22, a suspension plug 24 is connected from below to the support transducer 20 by shear screws 23, adjacent to the inner wall of the lower section of the casing string 25, connected to the base of the hollow casing 1. The hollow casing 1 is supplied near its top internal thread 26 for docking with the upper section of the casing column. high school

The washing windows 17 of the supporting rod 6 are hermetically sealed from the inside by a movable bushing of variable cross-section 27 with radial sockets 28 in which spherical latches 29 are located. The radial movement of the spherical and) latches 29 is limited by the inner wall of the support guide 20 and the outer annular groove 30 of the stepped lock sleeve 31 Movable sleeve of variable section 27 is held in the cavity of the supporting rod 6 by shear elements 8. Gee! z In the process of lowering the lower section of the casing string 25 into the barrel of the intermediate string of pipes 32, the supporting rod 6 is connected to the drill string (conditionally not shown). From an unforeseen axial downward movement b» of the bearing rod b in the splined plug 16, connected with the "landing" of the column section, keeps in the upper extreme Ge! position of the safety compression ring 33, installed in the inner annular bore 34 of the splined plug 16 and sunk into the corner groove 35 of the supporting rod 6. o

Flushing windows 17 are opened by moving down the supporting rod b in the slotted plug 16 to contact with the support adapter 20 under the influence of the calculated weight of the drill string unloading with subsequent tensioning. The estimated weight of unloading the drill string, which is necessary for unzipping the safety compression ring ЗЗ3, depends on the angle ' (see Fig. 7) formed by the contact line obtained from the intersection of the angular groove 35 of the supporting rod 6 with the safety compression ring 33 embedded in it and " cross-sectional plane. 8 s Sealing rings 36 ensure the tightness of movable connections. The device works as follows. On the drill pipe string connected to the supporting rod 6, the device with the "" lower section of the casing string 25 (see Fig. 1) is lowered into the barrel of the intermediate pipe string 32 to a specified depth. In the event of unexpected landings and pulls during the descent of the device into the well, the flushing windows 17 of the support rod 16 remain hermetically closed by the movable sleeve of variable section 27, because - and from the axial movement down, the support rod b holds the safety compression ring 33, embedded in the corner groove 35 of the support rod 16. After reaching the specified depth, a certain volume of tamponage solution is injected and

Te) it is pushed with drilling fluid together with a separating plug (not shown on the drawing) until it fits into the suspension plug 24. Excessive internal pressure destroys the shear screws 23 and both plugs are pushed with drilling fluid until they fit on the thrust ring, which is evidenced by the growth pressure at the end of injection (Che) of the full volume of tamponage solution through the non-return valve into the annular space (not shown in the drawing).

With the calculated value of the unloading weight of the drill string with the supporting rod 6 (see Fig. 2), the safety compression ring 33 is unzipped and the supporting rod 6 is moved down in the splined plug 16 to contact with the stop adapter 20. At the same time, together with the supporting rod b, the disc pusher is lowered down 5, fixed immovably on the supporting rod b by screws 7 with cutting elements 8. The force of the disk pusher 5 and F) moves down the cylindrical fingers U, held in the hollow body 1 by locking screws 14, to the location of their recesses 10 in the same horizontal plane with the latches 13 die 4.

With the energy of pre-compressed springs C, the unfixed slip plates 4 will move to the uppermost position and engage with the inner wall of the intermediate column of pipes 32. Simultaneously with the supporting rod 6, the movable sleeve of variable section 27, held by the shear elements 8, will fall down, so that the spherical retainers 29, installed in its radial sockets 28, are located in the same plane as the internal annular bore 21 of the support transducer 20. Under the action of the weight of the stepped lock sleeve 31, the spherical retainers 29 from its outer annular groove ZO will radially move into the annular bore 21 of the thrust b5 of the transducer 20, and the free stepped lock sleeve 31 will go down to the limiter 22 and with its outer cylindrical surface will fix the movable sleeve of variable section 27. By tensioning the drill string (see Fig. 3)

the supporting rod 6 is moved up in the splined plug 16 to the stop and the device with the lower section of the casing column 25 is raised to the specified interval. At the same time, when the supporting rod 6 is tensioned, the cutting elements 8 are destroyed, the washing windows 17 are opened, and the supporting rod b is fixed by the safety compression ring 33. Through the open washing windows 17 of the supporting rod 6, the drilling fluid circulation washes out the excess mud from the annular space.

In the case of complications associated with the growth of well pressure, the unloading of the weight of the drill string, the supporting rod b is moved in the slotted plug 16 to the lower extreme position, as a result of which the flushing windows 17 are hermetically covered by the fixed movable sleeve of variable cross-section 27. 70 by rotating the drill string with the supporting rod 6, connected by slots 18 to the splined plug 16, the splined plug 16 is released from the left internal cut 15 of the hollow body 1, and with the lifting of the drill string to the surface, the supporting rod 6 with the splined plug 16 is pulled out together with the movable sleeve variable cross-section 27, a stepped lock sleeve Z1 and a support adapter (see Fig. 4). After that, the upper section of the casing column is connected to the internal slot 26 of the hollow 7/5 of Case 1.

This technical solution allows you to remove the stress concentration in the casing column, the axial load on the cement ring behind the column and preserves its integrity.

The application of this technical solution will improve the reliability of the device by eliminating the rotation of the drill string under the force of the weight of the lower section of the casing string, 2o reduce the likelihood of complications and accidents during the descent and fastening of the lower section of the casing string by eliminating the unexpected disconnection of the lower section of the casing string and premature opening of washing windows.

The device can be used for fastening oil, gas condensate, water and thermal wells. with

Claims (1)

The formula of the invention o A device for unloading the weight of the casing column during its sectional fastening, which contains a hollow o z The body is made in the upper part in the form of a truncated pyramid with a conical support of springs at the base, spring-pressed slip plates, which are installed on the pyramidal faces of the body with with the possibility of their longitudinal movement, the unit for driving the slip dies in the form of a pusher, the retainers of the slip dies Fo relative to the body in their lowest position, which interact with the cylindrical fingers having recesses, the splined plug installed in the body with the help of the left bearing cut in the cavity of which is) there is a supporting rod with washing windows and telescopically connected by splines to a splined plug, which differs in that to the base of the splined plug, which is made with an internal ring boring, a support transducer with a ring boring and a radially installed limiter is attached to the base of the splined plug, the bearing rod with washing windows kept i in the upper extreme position by a safety compression ring sunk into the corner groove of the supporting rod, the washing windows of the supporting rod are hermetically sealed from the inside « 70 It covers a movable sleeve of variable cross-section with radial sockets containing spherical retainers, the radial movement of which is limited by the inner wall of the support guide and the outer the annular groove of the stepped lock sleeve, which is freely installed in the inner cavity of the movable sleeve of variable cross-section, while the drive unit of the slip dies is made in the form of a disk pusher, fixed fixedly on the supporting rod and fixed with screws with shear elements that hold the movable sleeve in the inner in the cavity of the supporting rod, and cylindrical fingers movable in the axial direction with recesses and longitudinal -I guiding grooves are installed in the vertical holes of the housing for interaction with the retainers of slip dies and are fixed in the housing with locking screws recessed in the guiding grooves. 1 se) at 50 3e) F) name) 60 b5