Additional casing string cementing device
FIELD: oil-and-gas industry.
SUBSTANCE: invention related to oil-and-gas industry, particularly to constraction and repair of wells, with casing string failure. Additional casing string cementing device includes sealing and cementing units, also centraliser. The sealing unit includes a case with toothed cuttings and a sleeve, and installed on the case parker, consisting of a elastic sleeve and top and bottom stops. The cementing unit includes a case with a barrel on the top and a shoe on the bottom, a slide gate, installed in the sealing unit opposite to radial channels and the sealing unit sleeve ring fetch. The top stop is movable, the parker stop connected to the sealing unit case with share elements. The sealing element sleeve equipped with external centralisers from the top.
EFFECT: offered additional casing string cementing device provides significantly increase in operation safety, as it allows to centralise the device and additional tubing string, the offered device descends on the tubing string end inside of the failed string, which assures ACS high quality cementing, also the device allows to take it out in case of parkers non-hermetic landing before ACS cementing, which excludes ACS cementing under the parker, and excludes incident in the well.
The invention relates to the oil and gas industry, namely for the construction and repair of wells, the casing of which have become unfit for use.
A device for cementing additional casing (RF patent No. 36429, publ. in bull. No. 7 from 10.03.2004 year), containing a sealing Assembly that consists of a casing, a packer mounted on the housing and consisting of a cuff, and a check valve, priming site that includes a housing with radial channels and a gate that communicates with the body through the ball retainer and seal, characterized in that the housings sealing and priming sites are interconnected along the length of the through pipe and the housing sealing the node at the top and bottom provided with extensions in the lower extension check valve, leaking from the bottom up, the base of which is attached to the housing sealing host shear screws, and the upper extension housing is inserted extends the cone angle at the apex, dense enough to compress the pipe to the walls of the casing, and base diameter, the smaller the internal diameter of the pipe in position and having a hole under saddle discharged from the mouth of the valve, thus to extend the cone is rigidly attached self-sealing top to bottom seal, and to the pus more plastic, what additional pipe casing, and the casting gate node connected to the housing of the cutting elements, and its inner diameter is selected under the outer diameter of the nipple, mounted on the lower end of the tubing and provided with a tapered ledge and radial channels in the upper part and the circular groove for engagement with the balls of the latch, and the gate charging unit is designed with a tapered ledge at the top for engagement with tapered ledge of the nipple and the housing sealing the junction between the upper and lower extensions are equipped with longitudinal corrugations, when the expansion cone and the housing of the circulation valve is made of easily drillable materials.
The disadvantages of this device are:
firstly, the low reliability of the sealing site during planting pokerwise the device as possible the fluid passes through the cuff and through the hole expanding cone in an unpressurized landing valve on the seat, especially in contaminated wells (due to sedimentation and adhesion of dirt on the saddle).
- secondly, requires a high precision of the angle at the vertex of a widening cone, because if not, it is possible jamming of the expanding cone in the shell process carnerosana or unpressurized landing germ is tiirough node.
The closest in technical essence is a device for cementing additional casing (RF patent No. 2233375, publ. in bull. No. 20 dated 27.07.2004 year), containing a sealing Assembly that consists of a housing with radial channels and the gear notches, a packer mounted on the housing and comprising elastic cuffs, upper and lower lugs and the locking ring, priming site that includes a housing with radial channels and the Shoe, gate and ball retainer, with the lower stop of the packer is moving and abuts against the movable cylinder coupled to the housing of the cutting elements is located within mounting sleeve connected with him cutting elements and having a circular bore at the bottom end, the sealing Assembly is provided with a coupling connected to the case in which the radial canals and circular sample, with the inner diameter of the coupling over the sample slightly smaller than the inner diameter of the coupling under the selection gate is installed in the sealing site opposite the radial canals and circular sample of the coupling and provided with slots in which the ball retainer communicating with the annular sample in the clutch, Shoe molding Assembly is provided with circular bores, the upper of which is made under the internal diameter of the mounting sleeve seal most normal punctures and the subsequent node, and installed in the lower sleeve with a tapered cut in the upper part, connected to the Shoe shear elements and having in the area of the conical cut retaining ring, priming site contains technological coupling connected to one end of the pipe with radial channels and the other with a housing having an annular sample on the outer surface, interacting with ball retainer sealing hub, and an annular tapered ledge in the upper part, while the diameter of the upper annular cutting Shoe molding node is larger than the diameter of the lower annular bore, and a gate supplied with destructible limiters located on its nests from the inner surface, the inner diameter of the gate is equal to the outside diameter of technological clutch priming site.
The disadvantages of this device are:
firstly, it is impossible to center the device and an additional string of pipe at the end of which descends this device worn inside the tubing, in connection with what is contact the outer surface of the filling device and pipes additional columns with the inner edges of the worn pipe string, and this leads to poor cementing and premature corrosion of pipes.
- secondly, it is not possible to retrieve the device from the well when hermetical landing sealing device node before additional cementing the casing string.
Object of the invention is a device that allows you to center the device and an additional string of pipe at the end of which descends this device worn inside the tubing with the ability to remove the device in the case of unpressurized landing packer before additional cementing the casing string.
The problem is solved by a device for cementing additional casing containing a sealing Assembly that consists of a housing with a toothed notches and clutch at the top, in which the radial canals and circular sample, with the inner diameter of the coupling over the sample slightly smaller than the inner diameter of the coupling under the sample, a packer mounted on the housing and comprising elastic cuffs, upper and lower stops, one of which is made movable and is abutted against the movable cylinder with a retaining ring connected to the casing shear elements, and a movable stop is connected internally with the alignment sleeve, the priming site, including the case with technological sleeve top having radial channels above the rest, made interoperable with the gate, and the Shoe bottom, a gate mounted in sealing the node opposite the radial canals and circular sampling clutch sealing host and provided with slots in which the ball retainer, interacting with a circular selection in the clutch, and the Shoe molding Assembly is provided with a circular bore, which is made under the internal diameter of the mounting sleeve sealing site, and the diameter of technological sleeve priming site under the fence made with the possibility of a tight engagement with the inner diameter of the gate and is equipped with a ring sample under a ball retainer.
What's new is that the top end stop packer made movable, the lower stop of the packer is connected shear elements with the body sealing site, building sealing Assembly is provided with a longitudinal groove, tightly covered upper limit, thus coupling the sealing of the top node is equipped with external units, and the installation sleeve is placed in the case and is fitted by means of shear screws insert through which through the longitudinal groove of the sealing body node connected to the upper extreme position of the packer, the sealing coupling node at the level of the radial channels are ring inside the groove, above the radial channels priming site is additional emphasis made interoperable upper end with a sealing coupling node and combining radial channels priming site annular sample coupling.
Figure 1 shows the top cha is th device for additional cementing the casing string.
Figure 2 shows the lower part of the device for additional cementing the casing string.
Device for additional cementing of the casing (see figure 1 and 2), contains the sealing site 1 (see figure 2) includes a housing 2 with a toothed notches 3 and the sleeve 4 at the top, in which the radial channels 5 and the annular sampling 6.
The internal diameter of the coupling sleeve 4 over the sample 6 (see figure 1) is slightly smaller than the inner diameter of the coupling under the sample 6.
Packer 7 is installed on the housing 2 and comprises elastic cuffs 8, the upper 9 and lower 10 stops. The upper stop 9 abuts against the movable cylinder 11 with retaining ring 12 connected to the housing 2 shear elements 13.
The device also includes a priming site 14 (see figure 1)that includes a housing 15 (see Fig 1) with the technological sleeve 16 at the top, having a radial channels 17 above the stop 18, made interoperable with the gate 19, and the Shoe 20 below.
The gate 19 is installed in the sealing node 1 opposite radial channels 5 and the annular sample 6 clutch 4 sealing of node 1 and is provided with slots 21 in which the ball retainer 22 that communicates with the annular sample 6 in the sleeve 4.
The Shoe 20 (see figure 2) priming site 14 provided with a circular bore 23, which is made under the internal diameter of the mounting sleeve 24 seal most normal punctures and the existing node 1.
The diameter of technological sleeve 16 (see figure 1) priming site 14 under the stop 18 is made with the possibility of sealed engagement with the sealing ring 25 with the inner diameter of the gate 19. Case 15 priming site 14 is equipped with a ring sample of 26 under the ball retainer 22.
The upper stop 9 packer 7 (see figure 2) is made movable and is connected internally with the installation sleeve 24.
Clutch 4 sealing of node 1 is equipped with outer centralizers 27 (smfg). The sealing body 2 node 1 is equipped with a longitudinal groove 28, tightly covered upper stop 9.
Installation sleeve 24 are accommodated in the housing 2 and is fitted by means of shear screws 29 box 30, whereby through the longitudinal groove 28 of the sealing body 2 node 1 is connected with the upper stop 9 of the packer 7.
In the coupling 4 sealing of node 1 at the level of the radial channels 5 performed inside annular groove 31.
Higher radial channels 17 priming site 14 is located more emphasis 32, made with the possibility of interaction between the upper end 33 of the coupling 4 sealing of node 1 and combining radial channels 17 and casting node 14 with the annular sample 31 of the coupling 4.
The gate 19 is supplied with destructible limiters 34 located in the slots 35.
Sealing the node 1 is used in conjunction with casting hub 14.
With a the Yu prevent unauthorized overflows of liquid mating surfaces provided with sealing elements 36, 37, 38, 39, 40.
Device for additional cementing casing works as follows.
Before starting work with the proposed device to restore the integrity of the worn pipe string from the calculation of cement for an additional casing (DOC) 41 to the wellhead (figure 1 and 2 is not shown).
For example, in worn-146-mm casing pipe can be lowered 114-mm collar without coupling DOCK 41p subsequent cementing.
Before lowering the device into the well DOCK 41 (see figure 1), which is expected to launch this device, equipped with centralizers 27, which are welded by welding around the perimeter of the pipe ( figure 1 and 2 is not shown), for example, the centralizer 27 consists of four edges).
The number of edges equal to 4, is optimal from the point of view of the cementing quality and availability of the channels 42 between the ribs of the centralizer 27 for the passage of fluid, including cement mortar. The number of pipes selected for the installation of the centralizers 27, is determined by the curvature of the borehole and installed for each well individually. For example, centralizers 27 is welded to pipe additional casing, the deployed into the well through every 50 meters.
Sealing site 1 is wrapped around the lower end of the DOCK 41 and down in the worn casing (figure 1 and 2 do not show is about) well.
The interval unit is installed in the borehole must match what the packer 7 must be below the violations worn out casing on the intact area of the worn casing, confirmed geophysical research, higher layer (figures 1 and 2 not shown) on 10-15 meters.
Reaching the installation interval of the device the upper end of the DOCK 41 is fixed at the wellhead, for example on the column flange (figure 1 and 2 is not shown).
Then inside DOCK 41 at the lower end of the column tubing (tubing) 43 pouring down the node 14.
The descent of the casing 43 continue up until the housing 15 priming site 14 his Shoe 20 is hermetically will not enter into the installation sleeve 24 with a diameter of d3. Then begins unloading of the casing 43, which is celebrated on the weight indicator (figure 1 and 2 is not shown)installed on the wellhead.
Start smooth unloading of the tubing string to 70-80 kN on the installation sleeve 24 sealing of node 1, while the weight of the tubing string 43 is transmitted through the adjusting nut 24, the shear screws 29 box 30 mounted in the longitudinal groove 28 on the movable upper stop 9, whereby it is destroyed shear element 13, and then under the action of the weight of the tubing 43 is movable cylinder 11, the retaining ring 12, and a movable top support 9 is moved down, and moving the top emphasis, moving down, compresses the elastic cuff 8 packer 7.
Elastic cuff 8 packer 7 made the team and consists of rubber and metal rings that allows you to adjust the length elastic cuffs 8 and to produce a better seal. In the process of moving the movable upper limit 9 down elastic sleeve 8 extends radially outward and tightly pressed against the inner walls of the worn casing string.
Moving down the rolling cylinder 11, the locking ring 12 and the movable upper limit 9 under the action of the weight of the tubing 43 is up until the insert 30 will rest against the bottom end of the longitudinal groove 28, while the retaining ring 12 is fixed on the toothed notches 3 of the housing 2 sealing of node 1.
Next, produce a complete unloading of the casing 43 on the installation sleeve 24, this breaks down shear screws 29.
Fill process fluid annular space between the worn casing 41 and an up to the wellhead and check level change in the annular space. If the level in the annular space is reduced, it means that the landing of the packer 7 is not sealed. Then first extract from the well the tubing 43 with the priming site, and then lift up and DOCK 41, while in the process of firming up DOC 41 first dissolved with the serious elements 44 and lower stop 10 is moved down to the interaction with the ring 45, the result is the release of elastic cuffs 8 packer 7 (rubber ring is compressed radially inward from the inner walls of the worn casing. After removing DOC 41 of the wells produce a revision of the sealing host 1 device and repeat the above operations. If the level of process fluid in the annular space is not decreased, then proceed to the cement DOCK 41.
The tubing 43 will dopuskayut down, in this case 15 priming site 14 also moves down and at a certain point of technological sleeve 16 (smpeg) its focus 18 sits on the top side of the gate 19, with technological sleeve 16 with a diameter of d4(see figure 1) is sealed with the sealing ring 25 communicates with an inner diameter of d5the gate 19, and the annular sample of 26 case 15 priming site 14 is located opposite the sockets 21 of the gate 19. In the ball retainer 22 consisting, for example, of the three balls out of the ring sample 6, that is, out of engagement with the clutch 4 sealing of node 1, and gets in the ring sample 26 of the housing 15 priming site 14.
Then conduct further unloading of tubing 43 through technological sleeve 16 on the gate 19 of about 40-50 kN, this breaks down shear elements 34 and further unloading of tubing 43 breadboard the I sleeve more emphasis 32 sits on the top end 33 of the coupling 4 sealing of node 1.
At this point, the radial channels 17 technological sleeve 16 through the annular groove 31 made in the coupling 4 sealing of node 1, will be located at the level of the radial channels 5. This forms a hydraulic connection between the inner space of the casing 43 and the annular space between the worn casing and an 41.
Then the tubing string 43 in the annular space between the worn casing 41 and an upload and push the calculated volume of cement while the cement slurry rises upwards through the channels 42 between the ribs of the clamp 27, and centralizers protect DOCK 41 from engagement with the inner walls of the worn casing, aligning DOCK 41, which in turn allows you to produce high-quality cementing DOC 41, since the "head" of the device, thanks to the centralizer 27 (see figure 1). Then lift up the drill pipe 43 with the housing 15 priming site, in this case 15 priming site through ball detents 22 located on one side of the annular sampling 26 of the housing 15 priming site 14, and on the other hand - in the slots 21 of the gate 19, pulls the gate up 19, which covers the inside of the radial channels 5, with ball retainer 22 (balls fall in the annular sample 6) I is the CIO in engagement with the clutch 4 sealing site, getting rid of the ring sample 26 of the housing 15 priming site 14.
Next, the drill pipe 43 with casting hub 14 is lifted up, with installation sleeve 24 located on the Shoe 20 priming site 14, when lifting the tubing string 43 interacts with a locking ring 46, and, with sliding Shoe 20, falls on the borehole bottom. Then the drill pipe 43 with casting hub 14 is removed from the DOCK 41 on the surface and the well is left waiting for the hardening of cement (RFQ).
After RFQ gate 19 are knocked down at the bottom of the borehole and any instrument tubing. If necessary, the gate 19 and the mounting sleeve 24 located on the bottom hole, you can drill, as they are made of easily drillable material, such as cast iron.
The proposed device for additional cementing casing allows to significantly improve the reliability of the device, as it gives an opportunity to align the device and an additional string of pipe at the end of which descends this device worn inside the tubing that leads to quality cement DOCK. In addition, the proposed device allows you to retrieve the device in the case of unpressurized landing packer before additional cementing of the casing, which eliminates the cement DOCK below the packer, and means that there are no emergency is th situation in the well.
Device for additional cementing casing containing a sealing Assembly that consists of a housing with a toothed notches and clutch at the top, in which the radial canals and circular sample, with the inner diameter of the coupling over the sample slightly smaller than the inner diameter of the coupling under the sample, a packer mounted on the housing and comprising elastic cuffs, upper and lower stops, one of which is made movable and is abutted against the movable cylinder with a retaining ring connected to the casing shear elements, and a movable stop is connected internally with the alignment sleeve, the priming site, including the case with technological sleeve top with radial channels above the rest, made interoperable with the gate, and the Shoe bottom, a gate mounted in sealing the node opposite the radial canals and circular sampling clutch sealing host and provided with slots in which the ball retainer communicating with the annular sample in the clutch, and the Shoe molding Assembly is provided with a circular bore, which is made under the internal diameter of the mounting sleeve sealing site, and the diameter of technological sleeve priming site under the fence made with the possibility of a tight interaction with internal d is amerom gate and is equipped with a ring sample under a ball retainer, characterized in that the upper extreme position of the packer made movable, the lower stop of the packer is connected shear elements with the body sealing site, building sealing Assembly is provided with a longitudinal groove, tightly covered upper limit, thus coupling the sealing of the top node is equipped with external units, and the installation sleeve is placed in the case and is fitted by means of shear screws insert through which through the longitudinal groove of the sealing body node connected to the upper extreme position of the packer, the sealing coupling node at the level of the radial channels are ring inside the groove, above the radial channels priming site is additional emphasis made interoperable top end with sealing coupling node and combining radial channels priming site annular sample coupling.
FIELD: oil-and-gas industry.
SUBSTANCE: for the method execution descent the casing string into borehole, equipped with a shoe nozzle with a return valve, one directional valves, and install them on the reservoir bottom level. Install a parker unit and a stepped cementing sleeve over the reservoir roof. After the production string descending inject a washing fluid inside it, the first portion of a cement slurry and sealing solution, separating them with a cementing plug. Over flush the cement in to the hole clearance till the plug settled into retune valve seat. Then gradually increasing pressure open a puckering unit, pump through valves the sealing solution and the second portion of the cement slurry, which over flushes the liquid volume.
EFFECT: reservoir selective sealing efficiency increase, avoids the sealing solution pass through hole clearance towards to the top, cement rock presents behind the production string over the reservoir.
FIELD: oil and gas production.
SUBSTANCE: invention includes two-piece body containing upper and lower parts. In upper body part there located are fabrication holes overlapped from outside with spring-loaded differential sleeve fixed with shear screw under which a stop screw is located. In lower body part there made is fabrication hole in which a check valve is installed and which is interconnected with packer and overlapped with tubular sealing element made from plastic material. Between upper and lower body parts there arranged is connection pipe whereon V-shaped sealing cuffs are installed. At stepped increase of internal pressure of the device, subsequent actuation is performed, first, of packer, and then, of differential sleeve, with further opening of fabrication holes and cementing of casing string space. At that, V-shaped cuffs provide maximum tightness at well wall contact.
EFFECT: improving reliability of separation of beds in wells when cementing casing strings, including the ones hidden in side well bores owing to simplifying the device design, reducing the time required for process operations when cementing casing strings.
SUBSTANCE: invention refers to oil and gas industry, and namely to devices for lowering casing strings, and namely casing liners in order to seal the area behind the string. It includes a hollow housing, perforated connection pipe and liner, which are connected to each other by means of clamps. Hollow housing is connected to disconnecting piece which is connected to transportation column with top cementing plug installed in it. Disconnecting piece is equipped with a shell from above, which has the possibility of tight interaction with internal walls of hollow housing, and from below it is equipped with a hollow connection pipe and a hollow stock with holes telescopically installed in it from below. Hollow stock has the possibility of interacting with check valve when in operating position. Packer and anchor are installed in upper part of hollow housing.
EFFECT: possibility of simplifying the device design, owing to which number of process operations is reduced and probability of accidents occurrence in well is decreased.
FIELD: oil-and-gas production.
SUBSTANCE: invention related to oil-and-gas production, particularly to oil fields development, and used for executing of production stratum secondary opening. Essence of the invention is in cementing of the well and descending piping strings with installed on a case with a plug fitting made of acid-soluble material, washing out of the well and pumping an acid into the production stratum, well development. According to invention case is installed on tubing strings using automatic locker. Case has a centraliser and supports. Between the free end of the well and its bottomhole create a gap big enough to dislocate plugs. Before the cementation the horizontal well bore wash it out with high content foam with 5-10% magnesium content, with a volume equal to two volumes of horizontal well. After that cement horizontal well with a slurry, which have a certain filtrating qualities, based on polyurethane hydrophilic polymer, pumped with volume equal to cemented gap volume. Therefore lift up tubing pipes and disconnect them from case, supply them with slurry and hydrochloric acid, separate them from a well fluid and each other with acid resistant plugs with the immediate well fluid displacement along the gap between tubing pipes and well wall. To be supplied untill slurry reaches the bottom hole. After that connect tubing pipes with a case and continue supply till the pressure drop, triggered by interaction of the second plug with case supports. After some times well to be developed.
EFFECT: diversified range of application due to slightly cemented collectors use, and increase in efficiency due to non-perforated opening of the collector, and decrease of a well product watering.
1 tbl, 1 dwg
SUBSTANCE: invention is related to the field of mining, namely to cementing of oil and gas wells under conditions of moderate and high temperatures. High-temperature plugging cement includes the following components, wt %: plugging Portland cement 66 - 75, quartz with specific surface of 3500 - 4000 cm2/g 25 - 34, reinforcing additive -fibre with length of 6 mm 0.25 - 0.30. Invention is developed in subclaim.
EFFECT: improved quality of wells reinforcement, development of strong crack-resistant cement ring.
2 cl, 5 ex, 1 tbl
FIELD: oil-and-gas production.
SUBSTANCE: invention related to oil-and-gas production, can be used in well construction. Method includes descending of a casing string lower than thief zone, cementing casing string bottom part through its inner cross section up to thief zone and cementing of the casing string upper part through its string clearance over the thief zone, during cementing of the casing string upper part cement media with a filler or thickener flooded into string clearance at wellhead and pressed through by the cement, with a pressure about 1-5 MPa.
EFFECT: quality increase of string clearance cemented stone.
FIELD: oil-and-gas production.
SUBSTANCE: before lowering of protecting string on it is installed holder, packer unit, it is connected supporting column to protecting string by means of disconnector, it is lowered protecting string with disconnector into production string, it is suspended protecting string in production by means of action on holder, progressively it is unloaded weight of protecting string to walls of production string, after what by means of packer unit, which is located lower than leakage area, it is separated annular space between protecting and production strings, it is localised leakage area, it is disconnected by means of disconnector protecting string from supporting excluding its rotation and it is lifted the latter. Localisation of leakage area of production string is implemented by means of pumping of cement mortar into protecting string, forcing through it by squeezing plug into annular space between protecting and production strings, using at that overlapped to packer unit cementation clutch, up to stop of squeezing plug and pressure jump at wellhead ensured by disconnection of tubal and annular space by stop sleeve of cementation clutch, it is uplifted supporting column over top pipe of protecting string, breaking hydraulical connection, there are leached excess of cement mortar and is implemented flushing of space over top of protecting string by means of direct or back-flushing, after extraction of supporting column there are drilled out elements of cementation clutch excluding rotation of its operating details, blocked in protecting string.
EFFECT: method provides localisation of leakage area of production string at repair of wells with several intervals of leakage in layers, inclined to absorption, overlap of sealing procedures of protecting string with suspension of protecting string on production string, acceleration of wells' repair process.
FIELD: oil-and-gas production.
SUBSTANCE: n the method of localising leakage zones in a production casing, before lowering the protective casing, a holder is fitted on the protective casing, as well as the required number of devices for sealing the annular space between protective casing and the production casing in the leakage zone of the latter. The supporting column is joined to the protective casing using a disconnecting piece. A valve unit is placed under the disconnecting piece in the protective casing. The protective casing with the disconnecting piece is lowered into the production casing. Excess pressure acts on the valve unit in the protective casing for sealing the top tubing space, linked to the wellhead, separating it from the bottom tubing space, linked to the productive stratum. The protective casing is suspended, increasing pressure in the top tubing space until preliminary engagement of the protective casing with the wall of the production casing through action on the holder, which converts axial force to radial force. The weight of the protective casing on the wall of the production casing is gradually decreased, after which the leakage zones in the production casing are localised using sealing devices, preventing cross-flow in several intervals. The protective column is disconnected using the disconnecting piece from the supporting column without rotating it and the latter is raised. The valve unit comprises a suspended plug, which is forced into a stop ring so as to seal the top tubing space from the bottom tubing space. The disconnecting piece has a connector joined to the supporting column and a socket, joined to the protective column. The connector and the socket of the disconnecting piece are flexibly joined by a restraining bolt and grooves, and are fixed by shear bolts. Grooves are made in the connector and are joined together by an inclined channel. One of the grooves is open and a blind with a holder is fitted on the shear bolts. The second groove is closed and the restraining bolt fixed on the socket can move along the inclined channel and can interact with the blind. The supporting column is disconnected from the protective casing by loading the assembly of supporting pipes to the disconnecting piece through exit of the bolt on the socket from the groove in the connector and sliding the bolt along the inclined channel until the blind covers entrance of the inclined channel and the closed groove until alignment of the bolt in the socket with the open grooves in the connector. The top device for sealing the annular space is positioned on the wellhead using a compressor, and the bottom device - on the bottom hole using a compressor.
EFFECT: longer service life of the well and reduced expenses on repairs.
FIELD: oil-and-gas production.
SUBSTANCE: invention relates to oil and gas industry and can be used for well casing, tie-back casing in main and secondary well shafts, wellhead sealing and linking tubing-casing annulus, for pumping process fluid or cement mortar through fitting a stop sleeve in an axial channel, at the level of working holes, and after axial displacement, at the level of circulating holes, mounting a support saddle at the top butt-end of the stop sleeve, the diametre of the support saddle of which is equal to the diametre of the tip of the cementing plug, making recesses on the bottom butt-end of the stop sleeve, which, after axial displacement of the stop sleeve, engage with stoppers, and fitting a stopper in the support saddle of the stop sleeve.
EFFECT: safe pumping of cement mortar into the annulus, without its penetration below the device, with prevention of contamination of the production horizon or filter, and separation of tubing-casing annulus.
FIELD: oil and gas production.
SUBSTANCE: method refers to oil and gas industry and can be implemented for eliminating defects of cased columns. According to the method eliminating of leakage of the cased column consists in pumping insulating composition to the point of leakage; prior to pumping there installed packers below and above leakage in the well; pumping of the said composition is carried out through a flow string into space limited with packers; pumping is performed in two portions at ratio in volume 1:1; between the portions a portion of gas is pumped; also insulating composition contains napthene acids and or their derivatives and a complex additive containing calcium chloride and aluminium hydroxide at ratio 1:1 at following ratio of components of insulating composition, wt %: napthene acids and or their derivatives 50-90, the said complex additive 10-50, while ratio of portions of insulating composition and a portion of gas is from 1:5 to 1:10.
EFFECT: eliminating behind-the casing flow and water entry and raised adhesion of cement stone to rock.
SUBSTANCE: double-barreled parker with cable inlet contains form two parker barrels, a parker unit, with hydraulic or mechanical drive and a cable inlet sealing unit, and chemical reagents pumping lines. A parker barrels and an internal one, installed one into another and fix between each other with cable inlet orientation, entering barrels ring space through the parkers side window. The cable input sealing unit with chemical reagents pumping lines, consisting of a sealing element with support washers by ends, located in the ring space between barrels, under a press bushing. The sealing unit is joint-splitable and the sealing element separated with a wall with hydro-channels, connected with a control bulk channel.
EFFECT: parker operation reliability increase and cable input improved sealing, passing through the parker without a plug removal.
FIELD: oil-and-gas industry.
SUBSTANCE: invention related for a tubing string disconnection and the following connection to bottomhole equipment. Proposed hydraulic installation device consists of a case, a connecting unit and a collet, a nut. The case executed borings for bores on the collet leafs, which depth is equal to bores height. In the connection unit, between top and bottom parts executed radial holes for washing and located in staggered order. The boring executed stepped with two bores, the boring of the smaller diametre is for sealing, boring of the bigger diametre for the piston with cylindrical step displacement. At that length of the bottom boring cylindrical part is greater than the top boring length, but smaller than distance from a base of external cylinder case to boring for bores on the collet leafs. The piston executed with a cylindrical step and cannels, on the step for share bolts, in a middle part under the collet leafs and on the ends under sealing. In the piston top end part a ball located and an internal cant executed. The case connected with the connecting unit through the collet and the piston and fixed with a nut. The nut executed with boring for collet base bore.
EFFECT: reliability and efficiency of parker installation works increase, time consumption decrease.
4 cl, 5 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: well parker-anchor, containing a case, an anchor unit, consisting of a void cone and a ram, installed under a sealing element, located between a top fixed stop block and a bottom stop block, and a drive, made as a piston with pass through channel, equipped with pass though narrowing on the bottom, and from the top - with a void bar, which stiffly and axially connected with the cone from the top, stiffly fixed with the case. The piston installed inside of the movable cylinder, and the inside void between the cylinder and the piston connected with the bar void over the pistons pass through channel narrowing, at that the top stop block executed spring loader from the top and with ability of limited upwards movements, and the bottom stop block equipped with radial windows and is movable, has upwards movement ability, interaction with the cylinder at the bottom. Rams made roller shaped with longitude holes, installed in the bottom stop block windows on axis, which fixed perpendicularly to the case axis, at that the rollers longitude hole diametre is bigger then axis external diametre, and the rollers external surface serially interacts with the void bar external surfaces, the cone, the case and the wells wall during the bottom stop block movement relatively to the case. In the offered parker-roller design, which roles between the well wall and the case, achieves a reliable borehole separation in result to the tubing string weight, because of that parkering and unparkering executed with tubing string movement, which location controlled on the borehole head.
EFFECT: design simplification, operational reliability increase, manufacturing and maintenance works cast cutting due to simple and processible spare part use, their quantity decrease.
FIELD: oil-and-gas industry.
SUBSTANCE: parker contains a channel with sealing element, executed as a set of sleeves, and a hydraulic anchor, including a ram holder, rams and a cone, and an electrical cable, at that the hydraulic anchor has a case-piston, connected to the channel and creating a piston void together with creping its over the ram holder, connected through the channel wall hole with the channel external void, hydraulic anchor case-piston and the parker case connected with nipples over the sealing elements, inside the case-piston channel located a sickle shaped tube adjusting to its external surface, connected to the nipples inclined holes, the electrical cable goes throughout the sickle shaped tube, which cores enters the nipples inclined holes and connected to located on the nipples inclined holes ends cable connectors, with its help cable cores going through the sickle shaped tube connected to extension cables, at that the nipple connected to the channel, connected with tubing string, with the aid of which the parker installed inside the borehole with ability to of tubing string supply through nipples, the parkers channel and the hydraulic anchor case-piston medium produced form the well, at that nipples ends inclined holes and the sickle shaped tube ends mutual dislocation in one plane created because of the nipple position fixing relatively to the parkers channel and the hydraulic anchor case-piston, correspondingly with a help of a retainer nut, screwed on the parkers channel, which rotation relatively to the parkers channel limited with a stop screw, and nipples connected to the channel with captive nuts, screwed on the nipple screw till it external end meets retainer nuts.
EFFECT: parker operation reliability increase.
4 cl, 1 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: device includes a cylindrical case with a sealing element and a parachute-centraliser and a seat, executed with an ability of the sealed element and the seat hermetic interaction. The seat executed as a pump lock support. The sealing element executed with an external cone part, replying to the pump support lock cone part, and an internal cone part, having coning direction opposite to a coning direction of the external cone part. The case has top cylindrical part and bottom cone part, located inside of the sealing elements internal cone part. The sealing element internal cone part and the case bottom cone part executed with a possibility of hermetic interaction. The parachute-centraliser is a barrel shaped, fixed on the case top cylindrical part with the barrel walls directed to the bottom. The barrel walls have holes. A share pin located in the case top cylindrical part flush to the sealing element.
EFFECT: device allows to simplify design and decrease technology operation time during operation, cast cutting.
FIELD: oil-and-gas production.
SUBSTANCE: drilled parker contains setting tool, which includes hydraulic cylinder with bottom support, piston with adapter on the top, top and bottom connecting rods, the connecting rod made with radial canals and stiffly connected with a tip with a process holes to a perforated nipple, a sealing unit, which includes a sleeve, a deformable barrel and a drift with widening angle on its top, connected on the bottom part with a fitting, through a share ring - with the tip and the perforated nipple, which telescopically installed into the drift, equipped with external cylindrical sections, a cutting-off valve and a blind valve, fixed on the tip with a lock ring. The is telescopically installed directly into the deformed barrel and into the bottom support, relatively to which the tip in its transport position fixed with a share bolt. The shut-off valve made as a plug with external ring sampling, hermetically installed into the tip and fixed with stoppers, installed into the tip's process holes with ability of limited movements towards outside incase of share ring destroy and the drift penetration, also with ability to interact in transport position plug ring sampling from the inside, and with drift - from the outside, which external cylindrical sections have a similar diametre, separated with at least one ring cavity with a edge, directed to the sealing unit, at that the drift's widening angle is 20-25° relatively to the parker axis. The deformable barrel's internal cylindrical surface is double-stepped with the smaller diametre on the top, and the upper rod over the piston equipped with outside ring cavity, and the cylinder's sub in its upper part equipped with inside selection with a spring ring, executed with ability to interact with the upper rod ring cavity and piston fixation in the extreme upper position. Use of the bored parker because of drift improved design, which angle is 20-25° relatively to the parker axis, and external sections have the same diametres, separated with at least one ring cavity with the edge, allows to drift widening barrel twice for a drift's single pass, which it its turn made double - staged with the smaller diametre (D1<D2) on the top.
EFFECT: received cone is pressing the sleeve to the production string walls, which increases the bored parker setting reliability in the wells defined interval and avoids its sliding, avoids its resealing during the bored parker installation in to the well.
FIELD: oil-and-gas production.
SUBSTANCE: invention related to oil-and-gas production, particularly used to protect casing string from high pressure. Drilled out parker contains setting tool, including hydro cylinder with bottom support, piston, top and bottom rods, bottom one has radial canal and fixedly connected via tip with access holes to perforated nipple, seal assembly, including collar, deformable sleeve and dron with nozzle, connected on top to sleeve holder, telescopically fixed to support, and on the bottom with a nozzle via share ring with a tip and perforated nipple, which telescopically installed into dron, equipped with external cylindrical areas with external diameters increasing from top to bottom, cutoff valve and end plug, fixed on nozzle with stop collar. Sleeve holder and external support in its transit condition fixed between each other with shear bolt, cutoff valve consists of end plug with external ring , hermetically installed into tip and fixed with stoppers, which installed into nozzle access holes, allowing it limited outwards displacement in case of share ring damage and dron pass through, and also allowing in transit condition internal interaction with plug ring, externally - with dron, which external cylindrical areas connected via smooth transition.
EFFECT: application of drilled out parked with dron improved design allow to increase its installation safety and avoid "creep", and also cutoff valve designed as a plug except leakage during drilled out parker installation into well.
SUBSTANCE: this group of inventions refers to the mining industry, and in particular, to the borehole systems and the method of use of the borehole component. The method includes the use in the borehole component the seal having the filler in the form of nanofibre and implementation of the effect of the component within the hole. The system has the downhole tool having compacting element including polymer material. In the polymer material nanosize filler in the form of carbon nanotubes is dispersed.
EFFECT: this invention allows to improve the durability and improve the functioning of the downhole tools operating in the hostile underground environment.
27 cl, 13 dwg
FIELD: oil and gas production.
SUBSTANCE: invention relates to oil-producing industry, particularly to mechanical packers, used at operation of oil wells by electrically centrifugal pumps. Packer contains mine shaft with threads on butts and axial channel. On external surface of mine shaft it is figured groove, long slot blind below and open in top part of mine shaft. In middle part of mine shaft there are installed rests for cone. In top part of mine shaft by diametre there are implemented transverse slots, in which there are adjusting screws rigidly connecting mine shaft and rest. Under rest there are located sealing elements, cone and iron ring with ability of axial movement relative to mine shaft. In iron ring there are located toothed bowl slip sockets, guide pin and split keys rigidly connecting it to ring in axial direction. Into long slots of ring there are installed screw-thread dies, pressed in radial direction by springs. In area of coupling long slot is overlapped by washers with sealant.
EFFECT: invention provides for simplicity of erection and improvement of abhesion of tube space at usage of electrically centrifugal pump in untight wells.
FIELD: oil and gas production.
SUBSTANCE: invention can be implemented for pull-out of holes, for example for hydraulic break of beds (HBB) operated with one well. The hydro-mechanic packer lowered into a well on a flow string consists of a mandrel made in form of two pipes, of sealing elements with a hold-down device, of an upper anchor with a hydraulic drive, and of a lower anchor with a mechanic drive connected to each other with a bayonet joint. The bayonet joint consists of a bushing with slots located in the upper part of the packer; pins arranged on a bushing in the lower part of the packer come into the slots and interact with surfaces of the slots. Two shaped grooves set off at 180° relative to each other are made on side surface of the upper bushing; the upper part of grooves is conjugated with a cut. Unfolded pattern of each of grooves corresponds to working surface for directing the pin into the above said cut; working surface is situated at acute angle to plane of cross section conjugated with lengthwise cut. Its lower working surface is made at angle to plane of cross section of the packer equal to angle of friction of pair of metals interacting details are made out of; also the said angle is directed counter clockwise, if details of the packer are left sided.
EFFECT: improved operation characteristics.
1 cl, 4 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: packer has body in form of pipe, whereon collar compactors are placed with limiting washers, saddles for locking tool dropped from surface, cover, upper and lower fixing elements, made in form of anchoring assemblies, upper conical bushing, rigidly connected to pressing bushing and movably to the body, lower conic bushing, made rigidly together with body, guide of this conic bushing made in form of plate spring, placed by one end moveably in guiding groove in lower portion of lower die with teeth, and by other end fixed rigidly on greater diameter of this conic bushing, auxiliary pipe, placed inside the body. Packer in lower portion is provided with check valve, placed inside recess of body, concurrently being also the body of valve. Oppositely to valve saddle on same axis stepped locking bushing is placed with possible sliding inside body recess with limited drive and possible overlapping of radial grooves made in body, which, in its turn, is rigidly connected to auxiliary pipe via shear pin. Between stepped locking bushing and saddle compression spring is placed. Fixing elements of collar compactors are made in form of comb with inner teeth and outer conic generators in nose portion. On the side of collar compactors these are enveloped by inner conic portion of compression bushing, in its turn rigidly connected to upper conic bushing, and on the other side combs with inner teeth are placed sliding-moveably in radial grooves of guiding bushing placed between ends of upper conic bushing and inner conic portion of compression bushing with possible engagement by inner teeth of comb to slanting walls of body groove and interaction to all elements of this assembly.
EFFECT: higher reliability.