Garipov circulation packer

FIELD: oil-producing industry.

SUBSTANCE: invention is related to oil-producing industry, namely to method of packering in operation and development of oil wells. Packer contains hollow shaft with the main sealing element and multifunctional channel installed in the shaft and filled with filler, where at least one cable and one control instrument are located. Packer is equipped with additional sealing element, which is installed on the hollow shaft at the preset distance from the main sealing element with formation of circulation chamber between them after packer installation in intertubular space, the chamber communicates by means of control instrument installed in multifunctional channel with subpacker zone, and at least one relief valve/controller, which is installed under the main sealing element and accordingly installed in the transverse channel, arranged in the hollow shaft, or at least in one well chamber installed under the main sealing element. The external diameter of hollow shaft between the sealing elements does not exceed the diameter of sealing elements. Control instrument, which is installed in multifunctional channel, is installed in its bottom part. Circulating chamber is installed with the possibility of communication with internal cavity of hollow shaft by means of relief valve/controller. It provides increase of packer operation efficiency during pump operation of wells.

EFFECT: increase of packer operation efficiency in pump operation of wells.

5 cl, 2 dwg, 1 ex

 

The invention relates to the oil and gas industry, and more specifically to techniques for the extraction operation and development of oil wells during different technological operations, while isolating areas of leakage in the posting process and pumping of wells.

Currently there is an actual solution to the problem of the use of packers in the operation of wells pumping method with high gas factor.

When setting the packer above the pump to isolate the overlying interval of the well, the appearance of free gas in podvecerni zone during operation of the pump. Gas is usually separated from the oil by reducing the pressure in the well below the saturation pressure of oil by gas or by filtering gas from the gas cap, etc.

Free gas accumulating in the annulus in podvecerni area, has an adverse impact on the operation of pumps, particularly pumps (stall feeding, cavitation, engine overheating, low efficiency pump etc). Therefore, the use of packers in pumping wells, especially when the packer cuts off the pump from the upstream annulus (area of leakage)is strongly limited due to accumulation of gas in podvecerni zone. Existing methods (installation fitting, regulator or valve) to divert gas from Podaca the aqueous space in the required amount is not always possible, because there is often pressure on the pump intake by 5-20% below the saturation pressure and the gas, escaping, begins to accumulate in podvecerni zone. This is because when the pump pressure on his uicide will always be higher pressure on its acceptance and, accordingly, will be higher than the gas pressure in podvecerni area, making it impossible challenge in nadakarni zone or pipe in the space above the pump, usually filled with a solution of the killing.

Known packer comprising a barrel mounted thereon a sealing element with cones, die and subs (A.S. USSR №883331, CL EV 33/12, 1981).

The disadvantage of this packer is that when respitrace or failure of the packer due to accumulation of gas in podvecerni zone may occur accidental releases of gas from podvecerni zone, which can lead to an emergency at the well.

The closest analogue is the packer Garipova, including a hollow stem with a sealing element and located in the trunk multi channel, with multi channel filled with gas-permeable and/or sealing filler placed in it at least one cable, and/or one measuring device, and/or one regulating device (patent RF №56939, CL EV 33/12, 2006).

The implementation of this packer multi channel, the filled gas-permeable filler, allows to solve the problem of leakage of gas from podvecerni zone, but only for wells with minor gas factor.

Use it in wells operated pump deep gas factor of more than 50 m3/m3impossible , because the design of the packer does not provide for release of such a significant amount of gas from podvecerni zone, which leads to its accumulation, pushing fluid from podvecerni zone, getting gas at the pump intake and, consequently, to decrease the performance of the pump, to disruption of feeding or jamming of the latter.

In addition, the packer passes the accumulated gas in podvecerni zone through itself in the annular space, which does not affect the efficiency of the well.

The objective of the invention is to increase the technical capacity and the efficiency of the packer in the pumping well operation.

The problem is solved in that the flow packer, comprising a hollow barrel with a primary sealing element and located in the trunk multi channel filled with filler placed in it at least one cable and one regulatory instrument, equipped with an additional sealing element mounted on the hollow shaft at a specified distance from the main sealing element to form between them after the landing of the packer in the annular space of the circulation chamber, reported by posted in multi-channel regulating device with podvecerni area, and at least one by-pass valve/regulator mounted under the main sealing element and placed respectively in the transverse passage in the hollow shaft, or, in at least one borehole camera placed under the main sealing element, and the outer diameter of the hollow shaft between the sealing elements does not exceed the diameter of the sealing elements, and regulating device, housed in a multi-channel, installed in its lower part, with the circulation chamber, with the possibility of communication with the interior cavity of the hollow trunk by-pass valve/regulator.

Moreover, the regulating device installed in a multi-channel, can be made in the form of fitting or fitting with overflow valve.

The inner diameter of the bypass valve/regulator installed under the main sealing element exceeds the inner diameter of the regulating device installed in multi-channel.

The hollow shaft may be made of a compound comprising at least one pipe and/or one pipe.

In borehole camera can be set to control and measure the capacity of the device.

The essence of the invention lies in the fact that the supply of additional packer sealing element located at a distance from the main sealing element, allows after the landing of the packer and seal sealing elements to form a circulation chamber in the annular space and to circulate fluid between the internal cavity of the hollow shaft and the circulation chamber by installing a by-pass valve/regulator in the hollow shaft between the sealing elements to prevent the accumulation of gas in podvecerni area due to its permanent disposal through socket/regulator, housed in a multi channel within the lower sealing element, in the circulation chamber that acts as a gateway, and then, after pressure equalization in the circulation chamber with internal pipe pressure, the bypass of gas into the internal cavity of the tubing.

Creating a circulation of the camera allows you to bypass gas from podvecerni zone regardless of the pressure in the internal cavity of the tubing. The more the circulation chamber, the greater the amount of bypass gas and, consequently, a smaller number of times of shutter-pass valve/regulator, which reduces mechanical wear of the working parts of the by-pass valve/regulator.

Due to the diversion of the gas appears a long time in a stable mode to operate the pumping well.

At very high gas factor, such as more 70-100 m3/m3, it is recommended to perform the hollow trunk of a compound, it is possible to increase its length due to the installation of pipes or tubes between the sealing elements, thereby increasing the amount of circulating chamber.

It is necessary to select the volume of the circulation of the camera due to the fact that when a very small amount will often be activated and therefore very quickly wear out the bypass valve/regulator, and when a large volume of circulating packer becomes cumbersome.

Accommodation in the hollow trunk of a downhole camera with a by-pass valve/regulator gives the opportunity to change, revision and adjustment of removable by-pass valve/regulator and/or measuring device using cable technology.

The invention is illustrated by drawings, where figure 1 shows a General view of the circulation packer, a longitudinal section; figure 2 - ventilation packer with integrated downhole cameras.

Circulating packer includes a hollow shaft 1 mounted on the primary sealing element 2 and located at a specified distance from an additional sealing element 3 with the formation between the circulating chamber 4, a multi-channel 5 made in the form of a groove located in the floor with the will 1. In the lower part of the multi-functional channel 5 within the additional sealing element 3 has a regulating device in the form of the fitting 6 and the hollow shaft 1 under the sealing element 2 is made of the transverse channel 7, which is a bypass valve/regulator 8, which connects the circulation chamber 4 and the inner cavity 9 of the packer. Multi-functional channel 5 is filled sealing filler 10, through which is threaded a cable 11 to connect it to the pump (not shown).

Figure 2 shows the downhole camera 12 and 13 installed in the hollow shaft 1. In borehole camera 12 is a bypass valve/regulator 8, and borehole camera 13 mounted measuring device 14, the lower end of the fitting 6 is a bypass valve 15. The operation of the bypass valve 15 is similar to the work by-pass valve/regulator 8. The bypass valve 15 is usually set in cases where when using the circulation packers with defined standard diameters fitting 6 it is necessary to reduce its flow cross-section. The use of the bypass valve 15 also allows you to use one of the maximum diameter of the fitting 6, the volume of bypass fluid already regulated by the bypass valve 15.

Packer works as follows.

Before lowering the packer in vagina on the hollow shaft 1 set additional sealing element 3 at a given distance from the main sealing element 2 to create a circulation chamber 4 in the multi-functional channel 5, performed, for example, in the form of a groove on the outer surface of the hollow shaft 1, place regulating device, for example the fitting 6, sealing his filler 10, through the filler 10 pass the electric cable 11 to connect it to the pump. In the hollow shaft 1 between the sealing elements 2 and 3, preferably closer to the main, in the transverse channel 7 install bypass valve/controller 8 configured for opening-closing of certain differential pressure between the circulation chamber 4 and the inner cavity 9 of the hollow packer. The packer may be mechanical, hydraulic or mixed principle influence on the sealing elements. Then the screw packer on the tubing pipes, lowered to the desired depth and produce Petrovka by compression of the sealing elements 2 and 3. Sealing elements 2 and 3, extending, seal annular space of the well with the formation of the circulation chamber 4. As in the lower part of the multi-functional channel 5 has a regulating device in the form of fitting 6 or fitting 6 with a by-pass valve 15, which connects podarennuyu area with the circulation chamber 4, through the regulating device begins to receive the gas from podvecerni zone in the circulation chamber. Then, as the accumulation of gas in the circulation chamber 4 when lowering the AI pressure to a certain value, when the differential pressure between the chamber 4 and the inner cavity 9 of the hollow shaft 1 reaches the maximum set pressure of the bypass opening/regulator 8, it will be open. Moreover, the inner diameter of the bypass valve/regulator 8 is considerably greater than the inner diameter of the fitting 6 and the bypass valve 15. From the internal cavity 9 hollow shaft with high pressure into the circulation chamber 4 will rush liquid, after a quick fill fluid circulation chamber 4 and with almost equalizing the pressure therein and in the cavity 9 (depression from 0.1 to 3 ATM) gas will flow under the action of the Archimedean force as easier, from the circulating chamber 4 into the cavity 9 of the hollow shaft. After equalization of the pressure in the chamber 4 and the cavity 9 is closed by-pass valve/regulator 8. The liquid from the circulating chamber 4 through a small nozzle 6 and the bypass valve 15 flows into podarennuyu zone, but instead into the circulation chamber 4 enters the gas pressure decreases again and the process (opening-closing) pressure relief valves 8 and 15 and the circulation chamber 4 (filling and discharge) automatically resumes.

Selection of set pressure relief valves 8 and 15 can be accomplished by conducting a preliminary study well by descent to the monitoring and measuring device 14, for example, a pressure gauge, double acting, additional borehole camera 13 and the simultaneous measurement of pressures in the circulation chamber 4 and in the inner cavity 9 of the barrel 1 of the packer, and when retrieving data from TMS installed on the receiving ESP in real operation of the downhole pump. This will allow for more accurate setting of the valves 8 and 15 at the desired pressure, with the bypass valve/regulator 8 can be lowered or replaced by rope techniques in borehole camera 12 and display well on the optimal mode of operation.

An example implementation

Circulating packer was tested at well # 109 Karamushko field TPDN "Kholmogorneft" JSC "Noyabrskneftegaz. As packer was taken packer mechanical, performed on the outer surface of the barrel multi channel in the form of a groove in a length of 2 m, which exceeds the distance between the sealing elements of the packer. The amount of circulating chamber formed after the landing of the packer between 146 mm operating string and sealing elements spaced from each other at a distance of 1.2 m by inserting a pipe, was 0.93 m3. The optimal amount of the circulation chamber was calculated, taking into account the pressure drop across the nozzle and the bypass valve/regulator installed in a borehole is the Amer, and the speed and the time to fill/bleed fluid from the circulating chamber. In the groove was laid conductive cable, while in the lower part of the groove within the additional sealing element has a regulating device in the form of fitting. Further, the groove was filled with a sealing filler.

After preparatory work in well No. 109 to gas factor of more than 50 m3/m3was the descent of the pump ESP with TMS without separator circulating packer set above the pump ESP. After running well, only after 5 hours, when the pressure at the pump intake below the saturation pressure of 90 ATM, appeared the gas in podvecerni zone and in the circulation chamber respectively started by-pass valve/regulator, testified to the appearance of short term pressure peaks CBT. The well came on continuous mode of operation without disrupting the feed gas.

The application of the packer with two sealing elements forming the circulation chamber, will involve a significant number of wells with high gas factor in operation with leaky columns, and also to cut off and removed from the simultaneous operation of the overlying water-saturated layers.

1. Circulating packer, comprising a hollow barrel with the main o-e is a COP and is situated in the trunk of a multi-channel, filled with filler placed in it at least one cable and one regulating device, characterized in that it is provided with an additional sealing element mounted on the hollow shaft at a specified distance from the main sealing element to form between them after the landing of the packer in the annular space of the circulation chamber, indicated by placing multi-channel regulating device with podvecerni area, and at least one by-pass valve/regulator mounted under the main sealing element and placed respectively in the transverse passage in the hollow shaft, or, at least, in one borehole camera placed under the main sealing element, and the outer diameter of the hollow shaft between the sealing elements does not exceed the diameter of the sealing elements, and regulating device, housed in a multi-channel, installed in its lower part, with the circulation chamber, with the possibility of communication with the interior cavity of the hollow shaft by-pass valve/regulator

2. Circulating packer according to claim 1, characterized in that the regulating device is installed in a multi-channel, made in the form of a fitting or fitting with p is repasky valve.

3. Circulating packer according to claim 1, characterized in that the inner diameter of the bypass valve/regulator installed under the main sealing element exceeds the inner diameter of the regulating device installed in multi-channel.

4. Circulating packer according to claim 1, characterized in that the hollow shaft is made of a compound comprising at least one pipe and/or one pipe.

5. Circulating packer according to claim 1, characterized in that the downhole camera installed measuring device.



 

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FIELD: oil and gas industry.

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Packer // 2251614

FIELD: oil production industry, particularly means for dividing an annular space and a tube space in flowing, gaslift, and beam wells.

SUBSTANCE: packer includes shaft with outer bored surface and bead and sealing members supported by the bead. Packer also has air cylinder forming annular cavity together with packer shaft. Cavity is connected with shaft interior through radial channels. Packer includes anchoring means. Lower anchoring means includes cone with slips and slip holder having bored inner orifice and threaded orifices. Lower anchoring means rests upon the bead and is connected to the shaft by shear screws installed in threaded orifices of slip holder. Shaft defines inner bored diameter and includes sliding bush located inside shaft. Shaft is provided with lower and upper grooves for sealing rings receiving and with outer grooves for cams and additional shear screws installation. Outer grooves are located between lower and upper ones. Slots are formed below bead on outer shaft surface for installing cams with limited radial travel. Threaded orifices are formed on outer shaft surface above inner groove thereof. Arranged into groove are additional shear screws to secure sliding bush in its initial position. The slip holder is freely installed on shaft or is spring-loaded. Support-moving bush is installed in inner bored orifice of slip holder between shear screws and cams. Support-moving bush is provided with facet formed from cam side and contacts with cams along mating facets upon shearing of shear screws. Free travel between cams and end of support-moving bush exceeds shear screw diameters to provide shearing thereof. When sliding bush is installed in fixed position cams extend above an outer shaft surface generator to provide displacement of support-moving bush and cut of shear screws. When sliding bush is located in operating position cams are located below outer shaft surface generator and move in radial direction into outer groove of sliding bush to provide free cam movement under support-moving bush and shear screws.

EFFECT: reduced number of lowering and lifting operations and breakdowns in the case or packer separation or during packer pulling out of well.

18 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: device has body, made in form of branch pipe with elastic collar mounted on it, expanding assembly with cone, shear element, gear, lowered on pipes column into additional casing column and interacting with expanding assembly from above. Expanding element is positioned in upper portion of branch pipe and locked with its cone directed downwards, gear is made in form of pusher in lower portion and anchor assembly in upper portion. Pusher is made in form of hydraulic cylinder, made with possible pressure from above on expanding assembly and provided with piston and hollow rod, which is connected to piston rigidly, and to pipes column - hermetically with possible upward axial displacement. Anchor assembly is made in form of dies, mounted on hollow rod with possible radial movement outwards during movement of hollow rod upwards relatively to pipes column. Shear element holds hollow rod relatively to pipes column during lowering into well.

EFFECT: simplified construction, lower costs.

1 dwg

FIELD: mining industry.

SUBSTANCE: device has packer, mounting tool and anchor assembly. Packer expander is mounted in upper portion of body, and anchor assembly - above hydraulic chamber of mounting tool. Hydraulic chamber cylinder is mounted with possible displacement relatively to rod and hydraulically connected to inner space of device. Body of anchor assembly is provided with sockets, in which spring-loaded dies are mounted, which are activated by hydraulic effect formed in tubing pipes column, on which device is lowered into well.

EFFECT: simplified construction, higher reliability, higher efficiency.

1 dwg

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