Well bed isolation device

FIELD: oil and gas industry.

SUBSTANCE: invention pertains to oil and gas industry and can be used for beds isolation in a well in the course of its casing. Device for beds isolation in a well includes hollow casing with radial hole and hollow shear pin in it, hydraulic packer, outer sleeve that forms cavity with the casing opposite its radial hole, spring-loaded element and device position switch made in a form of a sleeve with cam slot with sockets for pin connected by grooves. Cam slot has two additional sockets; operating element and cam slot code of position switch are performed with the possibility of reciprocal movement of operating element with device switching from operating position with extension of packer sealing element into position of packer disengagement from hydraulic action and then into operating position of pre-packering with extension of sealing element. Device position switch can be made in a form of a bushing with four cam slots symmetrically arranged along its generatrix, in 90°, with a pin in every slot, with the possibility of switch movement with rotation in relation to all four pins according to the code of its cam slot in the course of pressure increase and fall in the device. Operating element can be performed in a form of a sleeve or plunger-valve located in the housing of valve assembly that has a channel between plunger-valve and cavity located opposite the radial hole of the casing.

EFFECT: provision of higher reliability of packering through the possibility of annular space pre-packering after main packering and packer disengagement from hydraulic action.

4 cl, 5 dwg

 

The invention relates to the oil and gas industry and can be used for the insulation layers in the well when her mount.

It is known device isolation layers in the well, comprising a hollow body with a radial hole, at least one blocked hollow shear pin, packer hydraulic action, a sleeve mounted on the housing and forming with it an annular cavity against radial openings, and means for breaking the hollow shear pin (USSR Author's certificate No. 1395809, CL E21B 33/14, 15.05.1988 year).

The disadvantage of this device is its low reliability and complexity of manufacture.

It is also known device isolation layers in the well, comprising a hollow body with a radial hole, at least one covered hollow shear pin, packer hydraulic action, bushing, at least one mounted on the housing and forming with it the cavity against radial openings placed in this cavity retaining the working sleeve and cooperating with the switch device made in the form of an annular sleeve with shaped groove along its generatrix, with nests under the finger, connected by grooves, and a finger rigidly connected at one end with the body and placed the other end in the socket curly groove with prob is the possibility of moving to rotate relative to the finger switch in accordance with the code it shaped groove when the increase and the pressure relief device, while working sleeve has an opportunity reciprocating movement of the switching device from the transport position into the working position with the extension of the sealing element of the packer in position with the off packer from hydraulic impact and safety provision against unexpected pressure increase in the well (Patent RF №2182957, IPC E21B 33/13, 2001).

A disadvantage of the known device is that it does not provide high reliability runtime packer works. This is due to the fact that after bringing the packer into position with the extension of the sealing element and then removing the packer from the hydraulic impact it is impossible to make dopachrome annular space in order to compensate for the stretching of the rubber sealing element.

The objective of the invention is to provide higher reliability runtime packer works by the possibility of dopachrome the annulus after a basic Petrovci and off of the packer from the hydraulic impact.

This object is achieved in that the device isolation layers in the well, comprising a hollow body with a radial hole, at least one covered hollow shear pin, packer hydraulic action, the outer sleeve, the us is set out in the housing and forming with it the cavity against radial openings, placed in this cavity is a spring-loaded operating element and interacts with the switch device made in the form of an annular sleeve with shaped groove along its generatrix, with nests under the finger, connected by grooves, and a finger rigidly connected at one end with the body and placed the other end in the socket shaped groove with move with rotation relative to the finger switch in accordance with the code it shaped groove when the increase and the pressure relief device, when this work item is made with the possibility of reciprocating movement of the switching device from the transport position into the working position with the extension of the sealing element of the packer in position and to disconnect the packer from the hydraulic impact and safety provision against unexpected pressure increase in the well, it is new that shaped groove switch device has two additional nests connected by grooves, and a work item and code shaped groove switch is configured to reciprocating movement of the working element with the switching device from the operating position with the extension of the sealing element of the packer in position with the off packer from hydraulic impact, RA is the forth position capacitance with the expansion of the sealing element.

The task is achieved by the fact that the switch device is made in the form of an annular sleeve with four symmetrically arranged on its generatrix through 90° shaped grooves, each of which is placed a finger, with the possibility of moving the switch to turn on all four fingers in accordance with the code it shaped groove when the increase and the pressure relief device.

The task is achieved by the fact that the work item is executed in the form of a sleeve.

The task is achieved by the fact that the working element is designed as a piston-valve, at least one accommodated in the housing of the valve unit having a channel between the piston-valve and a cavity located against radial openings.

Figure 1 shows the device in the initial transport position (work item is executed in the form of a sleeve); figure 2 - device in the initial transport position (work item is made in the form of piston-valve); figure 3 - the unit in its operating position when Petrovka (or capacitance) with the expansion of the sealing element; figure 4 - cross section a-a in figure 1; figure 5 is a view of the device in direction of the arrow In figure 1. Where the position of the switch 10 at the moment:

POS - transport position,

POS - after passing through the device to cement the training tube,

.23 - after dumping the pressure in the column,

24 - at the moment of actuation of the packer,

POS - after dumping the pressure in the column,

option 26 - at the moment of actuation of the packer when capacitance,

POS - after dumping the pressure in the column,

POS - when an unexpected pressure increase (repairs in the well).

The device isolation layers in the borehole (see figure 1) includes a hollow body 1 with a radial hole 2, at least one. This hole is blocked hollow shear pin 3 o-ring 4.

The device has a hydraulic packer actions (in the drawing conventionally not shown). Set on the box outer sleeve 5. It forms with the housing an annular cavity 6 against the radial holes. There is a means for the destruction of the hollow shear pin (not shown conventionally).

It can be done, for example, in the form of cementing plugs. In the annular cavity 6 posted by work element 7 o-ring 8. Work element 7 is spring-loaded by a spring 9. In the annular cavity 6 are placed in the switch device 10. It communicates with the working element 7 and is made in the form of an annular sleeve with shaped groove 11 on its generatrix (1, 5). Housing is rigidly connected to the finger 12 one end. When the finger 12 and its other end is placed in curly groove 11 plumage is of locates provisions 10. When the switch 10, it shaped groove 11, the finger 12 and the operating element 7 is designed in such a way that provides the ability to move with the rotation of the switch 10 with respect to the finger 12 in accordance with the code figured groove 11 (after the destruction of the hollow shear pin 3) and the reciprocating movement of the working element 7 with the switching device in its various provisions.

Work element 7 may be made in the form of a sleeve located in the annular cavity 6 formed by the outer sleeve 5 and the housing 1 (Fig 1). Work element 15 can also be made in the form of piston-valve o-ring 14 located in the housing 17 of the valve block with a channel 13 in the casing of the valve block 17, which connects the piston-valve 15 with a cavity 6, which is against the radial holes of the chassis (figure 2). The housing 1 includes an outer annular groove 16 to bypass fluid from the cavity of the housing 1 into the cavity of the packer through the annular cavity 6 in the working position (Fig.1-3). The switch 10 has a shaped groove 11, comprising upper and lower slot 19 under the finger 12, interconnected by grooves 18 (figure 5). This groove 18 and socket 19 are displaced relative to each other vertically and have the edges 20 of the connecting groove is made at an angle to the vertical. This embodiment shaped groove 11 (with whom akimi edges and grooves) provides the possibility of turning the switch in the radial direction and the transition to a new position. Shaped groove has eight sockets 19 for fixing the finger 12 in one of eight positions 21-28 (figure 5), providing different location. In contrast to the prototype, which has shaped groove switch has six sockets, in the patented design of the device has an additional two slots. This enables reciprocating movement of the working element with the switching device from the operating position with the extension of the sealing element of the packer in position with the off packer from hydraulic impact in the working position of capacitance with the expansion of the sealing element. The switch device 10 may also be made in the form of an annular sleeve with four symmetrically arranged on its generatrix through 90° shaped grooves 11, each of which is placed a finger 12, can move with relative rotation of all four fingers of the switch in accordance with the code it shaped groove when the increase and the pressure relief device (figure 4). This switch design prevents distortions of its movement in the process and provides a more reliable switching the device from one position to another.

The device operates as follows.

After descending column casing in the borehole or saliva the th column to the zone, subject isolation) long device in the column allowed cementing (separator) tube. This tube is cut hollow pin 3 and is moved down to the landing on the stop ring (not shown). When the movement of the cementing plug (not shown) of the liquid from the cavity of the column under the action of excess pressure through the hole destroyed hollow pin 3, compressing the spring 9, partially moves the work item 7 (15) and the switch 10. While the end of the finger 12, located in the curved groove 11 (or four fingers arranged in curved slots), cranks switch 10 and sets him in position 22 (figure 5). In this position the switch is in the whole time of cementation. When this hydraulic communication with the packer is not required because the work item 7 (15) mixed up progressively in the annular cavity 6 for a limited distance at which there is no possibility of bypass fluid from the cavity of the housing 1 into the cavity of the packer through the annular cavity 6 in the working position of the device.

The sealing ring 8 work item 7 (or work item 15) provide the necessary sealing devices (1, 2).

After cementing wells and isolation layers in the borehole pressure in the casing and the cavity of the housing 1 is removed (discard).

Work element 7 (or R the working element 15) under the action of a spring 9 provides the possibility of twisting of the switch 10 and holds the position 23 (performs reciprocating movement). When you increase the pressure in the column of the work item 7 (15), compressing the spring 9 moves. When the switch 10 is position 24.

Thus there is an increased stroke work item 7 (15). Its upper end is lowered below the upper edge of the outer annular groove 16 of the housing 1 (Fig 3). This provides the ability to bypass fluid from the cavity of the housing 1 into the cavity of the packer through the annular cavity 6 and the resulting longitudinal annular channel grooves 16.

Fluid through the open longitudinal annular channel 16 is fed into the cavity of the packer (sealing element) and expands the sealing element of the packer. That is, the packer with its expansion of the sealing element is in the operating position.

After dumping the pressure in the column (the device) work item 7 (15) under the influence of spring 9, turning the switch 10 again makes his return move down, but in position 25 (figure 5). The upper end of element 7 (15) rises above the upper edge of the outer annular grooves 16 and overlaps the longitudinal annular channel. The flow of fluid into the cavity of the packer stops.

In the case when you want to make dopachrome annular space is designed to compensate for the stretching of rubber o e the ment of the packer, produce a second increase of the operating pressure in the column (the device). In this case, the work item 7 (15) again moves, compressing the spring 9. When the switch 10 is position 26 (figure 5).

If this happens again increased stroke work item 7 (15) and its upper end is lowered below the upper edge of the outer annular groove 16 of the housing 1 (Fig 3). This provides the ability to bypass fluid from the cavity of the housing 1 into the cavity of the packer through the annular cavity 6 and the resulting longitudinal annular channel grooves 16.

Fluid through the open longitudinal annular channel 16 is fed into the cavity of the packer (sealing element) and further expands the sealing element of the packer. When this occurs dopachrome annular space and thereby achieves higher reliability runtime packer works.

After dumping the pressure in the column (the device) work item 7 (15) under the influence of spring 9, turning the switch 10 again performs its return movement down, but in the position 27 (figure 5). The upper end of element 7 (15) rises above the upper edge of the outer annular grooves 16 and overlaps the longitudinal annular channel. The flow of fluid into the cavity of the packer stops.

Further nepr is vidennyh increases the pressure in the column (for example, when repair work in the borehole) includes safety position of the device. For this purpose, the axial displacement of the switch 10 in position 28 (figure 5). In this position movement of the work element 7 (15) is limited. Its upper end does not reach the upper edge of the outer annular groove 16 of the housing 1. This ensures the reliability of the device, and it is insured against unforeseen increases the pressure in the column.

The advantages of the patented device isolation layers in the well is as follows.

Ensures higher reliability of holding the packer works due to the possibility of execution dopachrome the annulus using the same device. In addition, improving the reliability of the run-packer work is achieved by the fact that the design of the switch device provides smoother, without distortions, moving it in the axial and radial directions due to four symmetrically spaced grooves in which are placed the fingers.

1. The device isolation layers in the well, comprising a hollow body with a radial hole, at least one covered hollow shear pin, packer hydraulic action, the outer sleeve mounted on the housing and forming with it the cavity opposite'm glad the material of the body bore, placed in this cavity is a spring-loaded operating element and interacts with the switch device made in the form of an annular sleeve with shaped groove along its generatrix, with nests under the finger, connected by grooves, and a finger rigidly connected at one end with the body and placed the other end in the socket shaped groove with move with rotation relative to the finger switch in accordance with the code it shaped groove when the increase and the pressure relief device, when this work item is made with the possibility of reciprocating movement of the switching device from the transport position into the working position with the extension of the sealing element of the packer in position and to disconnect the packer from the hydraulic impact and safety provision against unexpected pressure increase in the well, wherein the shaped groove switch device has two additional nests connected by grooves, and a work item and code shaped groove switch is configured to reciprocating movement of the working element with the switching device from the operating position with the extension of the sealing element of the packer in position with the off packer from hydraulic impact, RA is the forth position capacitance with the expansion of the sealing element.

2. The device according to claim 1, characterized in that the switch device is made in the form of an annular sleeve with four symmetrically arranged on its generatrix through 90° shaped grooves, each of which is placed a finger to move the switch to turn on all four fingers in accordance with the code it shaped groove when the increase and the pressure relief device.

3. The device according to claim 1, characterized in that the working element is designed in the form of a sleeve.

4. The device according to claim 1, characterized in that the working element is designed as a piston-valve, at least one accommodated in the housing of the valve unit having a channel between the piston-valve and a cavity located opposite radial openings.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method to insulate an absorption zone in a well includes portion preparation of plugging compositions based on acetone-formaldehyde resin and liquid glass that harden in presence of structure formers, their pumping into a well and placement in an absorption zone. During preparation of two separate portions of plugging compositions, a gel powder and a structure former for liquid glass are added into a portion from acetone-formaldehyde resin, a structure former for acetone-formaldehyde resin is added into a portion of liquid glass, and structure formers are represented by accordingly a phosphogypsum and a 15% aqueous solution of caustic soda, besides, pumping and movement of plugging composition portions in the well is carried out by two contactless flows, and mixing of flows is carried out upstream the absorption zone at the ratio of 1:1 with the following ratio of components, wt parts: the first flow: acetone-formaldehyde resin 120, gel powder 25, phosphogypsum 40, the second flow: liquid glass 105, 15% aqueous solution of caustic soda 30.

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2 tbl

FIELD: oil and gas industry.

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2 ex

FIELD: chemistry.

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4 cl, 2 tbl, 1 ex

FIELD: oil and gas industry.

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6 cl, 4 tbl

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43 cl, 11 tbl, 4 ex

FIELD: process engineering.

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FIELD: oil and gas industry.

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4 dwg

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17 cl, 2 tbl, 1 ex, 1 dwg

FIELD: mining.

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21 cl, 2 ex, 3 tbl

FIELD: oil-and-gas production.

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1 tbl

FIELD: oil and gas production.

SUBSTANCE: invention relates to insulating formation water inflow in gas and gas condensate wells with the aid of coltubing techniques. In particular, flexible conduit is descended through the tube space of well operated under pressure to the bottom with the aid of coltubing installation. Latches on tube and annulus spaces are opened. Well hole is filled through flexible conduit with gas condensate. Grouting mortar is prepared in preparation block by mixing cement mortar with setting retardant and mortar flowability enhancer in a calculated amount needed to prevent formation water inflow. Further, flushing fluid, e.g. methanol, is pumped through flexible conduit in amount constituting 0.3-0.6 volume of flexible conduit. Annulus space is closed and grouting mortar is pumped through flexible conduit in amount required to fill well hole in interval of water-inflow part of formation. When grouting mortar in hole rises to specified height, tube space is closed and grouting mortar contained in flexible conduit is forced into water-inflow part of formation by in series pumped flushing fluid and displacing solution: for example first methanol in amount 1.0-1.3 volumes of flexible conduit and then gas condensate in required amount, which however does not exceed internal volume of flexible conduit, until grouting mortar begins being pumped in amount of 0.3-0.5 volumes of flexible conduit. Then tube and annulus spaces of well are opened and gas condensate begins being simultaneously pumped into tube and annulus spaces in order to prevent rise of grouting mortar therein above interval of the water-inflow part of formation. Thereafter, bottom of flexible conduit is raised by 1 m above indicated interval and excess of grouting mortar is cut and washed away with gas condensate passed through flexible conduit into tube space, where excess grouting mortar remains in fluid state. After cement setting expectation time, flexible conduit is descended to the top of cement column and tests the latter for strength applying 4.0-5.0 kN loading by means of injector of coltubing installation through flexible conduit. Finally, cement bridging is subjected to hydraulic pressurization and flexible conduit is removed from well.

EFFECT: enabled formation water inflow insulation without killing of well and restricted pollution of water-inflow part of formation.

3 cl, 1 dwg

FIELD: oil and gas chambers construction.

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EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: invention provides grouting composition intended for selective insulation of water inflows into wells, including those occurring under low-temperature and high-permeation oil reservoirs, as well as for suppressing lost-circulating zones and brine inflow zones. Composition including product of hydrolytic etherification of chlorine-containing phenyltrichlorosilane still residues with aqueous alcohol solution contains, more specifically, product obtained by hydrolytic etherification of 100 wt parts of indicated residues with 10-32,8 wt parts of 90-93% aqueous alcohol solution in presence of 10-40 wt parts of orthosilicic acid ethyl ester and, additionally, 15-35 wt parts of chlorine-containing phenyltrichlorosilane still residues at summary content of the two components 133.2-161.6 wt parts. Grouting composition may further contain up to 16.8 wt parts of polar solvent.

EFFECT: lowered repair operation cost, enabled utilization in a wide formation temperature range, including that in high-permeation and low-temperature oil reservoirs, and prolonged shelf time of grouting composition.

2 cl, 1 tbl

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes feeding water-isolating compound along tubing pipes, containing polyvinyl spirits and consisting of components forming an impenetrable zone in case of mixing in the bed, pressing it into bed, washing and exposure of well for forming of impenetrable zone, tubing column is lowered for 2-3 meters below perforation range, and into isolation range along tubing pipes hydro-repelling liquid is first pumped, in volume, exceeding volume of water-isolating composition in at least two times, water-isolating composition includes special liquid except from polyvinyl spirits, its pumping is performed in sequence - first goes polyvinyl spirits, then buffer liquid, special liquid, buffer liquid, repeating these operations until reaching required height of isolation interval and fixing of well-adjacent area, after that said pressing, washing of well and said polymerization exposure are performed.

EFFECT: higher efficiency.

1 dwg, 1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes lowering feeding column into well with mounting of its shoe above ceiling of absorption zone. Along feeding column portions of working liquid are fed into well. As the latter alkali waste of kaprolaktam production or its solution is taken. Working liquid is alternated with portions of its thickener - sodium silicate; alternated by water buffers. Working liquid is pumped at consecutively decreasing concentration. Water buffers are pumped at consecutively decreasing volume. After output from feeding column of first portions of working liquid and its thickener, pumping is continued in cyclic mode with periodical stops of pumping from waves generation condition in such a way, that straight and reflected pressure waves interact in well shaft above absorption zone and below this zone.

EFFECT: higher efficiency.

6 cl

FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency.

7 cl, 1 ex

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