RU2513566C2 - Dual string production method in well with increased gas ratio and device for its implementation - Google Patents

Dual string production method in well with increased gas ratio and device for its implementation Download PDF

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RU2513566C2
RU2513566C2 RU2012135325/03A RU2012135325A RU2513566C2 RU 2513566 C2 RU2513566 C2 RU 2513566C2 RU 2012135325/03 A RU2012135325/03 A RU 2012135325/03A RU 2012135325 A RU2012135325 A RU 2012135325A RU 2513566 C2 RU2513566 C2 RU 2513566C2
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well
packer
gas
cavity
column
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RU2012135325/03A
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Russian (ru)
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RU2012135325A (en
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Михаил Иванович Галай
Дмитрий Леонидович Третьяков
Николай Александрович Демяненко
Владимир Давидович Гошкис
Александр Николаевич Цыбранков
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Республиканское Унитарное Предприятие "Производственное Объединение "Белоруснефть"
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Abstract

FIELD: oil and gas industry.
SUBSTANCE: group of inventions relates to split-stream production of several formations with use of a sucker-rod pumping unit. The method includes running of the unit including a flow column, a liner-packer combination ensuring splitting of the upper and the lower operated formations, sucker-rod pump for formation fluid pumping from two formations which inputs communicate with the over-packer and the under-packer space through suction valves while its output communicates with a cavity of the flow column through an injection valve; a transition element providing hydraulic connection of the under-packer space through the liner to one of suction valves of the sucker-rod pump and permanent separation of associated gas from the fluid produced from the lower formation to the in-field flow line at the well head or to the over-packer cavity of the well above dynamic level through the borehole pipeline. After separation of associated gas the formation fluid is pumped from two formations through the flow column at the well head.
EFFECT: improving separation and extraction of associated gas contained in the formation fluid.
3 cl, 3 dwg

Description

The group of inventions relates to the oil industry, in particular to the separate operation of several layers using a sucker rod pump unit.
A known method of oil or gas production from multilayer wells [1], including geological and technical measures to eliminate reservoir flows, which consists in the fact that between all the layers, including powerful and weak, install packers, forming sealed volumes of the well, communicate between these volumes the well with a common pipe, which is connected with the upper end to the production pump in the well or to the transport system at the wellhead, and the lower end enters the volume of the well in the zone of the lower powerful formation and which has sections level of each well volume in the common pipe sections mounted jet pumps, and the volumes of weak zones in the well layers and all higher layers are interconnected tube sealingly extending through the wellbore volume into zones thick seams.
The disadvantage of this method is that it does not provide isolation and separate operation of several reservoirs, while uncontrolled flow of reservoir fluid through tubes decentrally installed in packers and hydraulically connecting weak reservoirs is possible. In addition, the method does not provide for the removal of associated petroleum gas entering the pump from the packer.
A known pump installation for simultaneous and separate operation of two layers in a well [2], comprising a column of elevator pipes, a column of hollow rods, a packer and a differential pump with upper and lower hollow plungers, the suction valve of the upper section of the differential pump installed on the side, and the discharge in the bypass channel of the upper section, in communication with the cavity of the lift pipes, the upper plunger with the bypass channel made therein, mounted on the hollow rod using the latter with the possibility of fluid flow and about boundedness axial displacement, wherein a bypass channel is provided below the discharge valve seat, a hollow rod - a locking body disposed on its outer surface, and a pusher cooperating with the top plunger.
A disadvantage of the known installation is that it does not provide for the removal from the intake of the suction valve of associated gas released from oil extracted from the lower productive layer cut off by the packer, and thus cannot be used in oil fields with an increased gas factor.
Also known is a unit for simultaneously separately operating two layers [3], including a column of lift pipes, a sucker rod pump, a packer and a liner, while the sucker rod pump is equipped with an additional suction valve located on the side wall of its cylinder and dividing this cylinder into two parts, proportional to the productivity of the seams, while the installation allows the sucker rod pump to enter the cylinder, when the plunger moves up, first the low-pressure formation is produced, and after passing a venter of an additional valve - production of a high-pressure formation.
A disadvantage of the known installation is also that it does not provide for the removal from the intake of the suction valve of associated gas released from oil produced from a lower productive formation cut off by the packer, and thus cannot be used in oil fields with an increased gas factor.
Closest to the technical nature of the claimed group of inventions is a method for simultaneous and separate operation of two layers in a well, implemented using the installation described in patent RU 59138 U1 [4]. The method consists in lowering a unit into the well, including a packer for separating exploited formations, a column of elevator pipes, a column of hollow rods, two successively installed rod pumps, the upper of which has an additional lateral channel (bypass) along the outer surface with a suction valve at the intake and a discharge valve on the outflow into the cavity of the column of elevator pipes, and the lower pump has a suction valve at the inlet to its cylinder, a discharge valve at the entrance to its plunger, while the hollow plungers are about of these pumps are connected coaxially with a hollow rod, with the possibility of through passage of fluid flow from the lower layer through a common channel into the cavity of the column of hollow rods and further to the surface with reagent supply equipment located on it, while around the hollow rod the installation has an interplunger cavity of variable cross section, which communicates through the inlet valve with the annular over-packer space, and through the bypass with the discharge valve located in it, it communicates with the lift cavity of the tubing string. The interplunger cavity, changing in volume due to the input-output of plungers with different diameters in it, in the case of using an upper pump of a smaller diameter than the lower one, is a discharge and suction cavity at the same time, and in the case of using an upper pump of a larger diameter it is only a suction cavity, and the injection cavity is the lift cavity of the tubing string. On the outer surface of the elevator pipes, from the surface into the cavity of the liner to receive the lower pump, a cable is laid with conductive cores connected to a manometer - a thermometer - a borehole moisture meter and capillary tubes, one of which is equipped with a check valve in the lower end, and the upper end is connected to the equipment for supplying reagents, another tube, for venting gas, is equipped on the upper end with a gas vent valve. After the descent of the installation, oil is lifted from two layers into the flow line of the well and into the tubing string.
The disadvantage of the above device is that the use of two pumps significantly complicates the method of oil production and design for implementing the method, because the use of rigidly interconnected pumps does not allow to regulate the selection of fluid from one reservoir without changing the selection of fluid from another reservoir. In addition, the fact that the gas outlet capillary tube is inserted directly into the intake chamber of the lower pump adversely affects the gas separation process, since not all free gas released from the oil enters the gas outlet capillary tube, most of it still enters the pump. since the overall dimensions and throughput of the capillary pipeline is immeasurably smaller than the overall dimensions and throughput of the suction valve of the pump.
The problem to be solved by the group of claimed inventions is the development of a method and the creation of an installation for simultaneous and separate operation of two reservoirs in oil fields with an increased gas factor, which ensures the separation and removal of associated gas released from the reservoir fluid extracted from the lower cut-off packer from the intake valve , productive formation.
The problem is solved due to the fact that in the method of simultaneous and separate operation of two layers in a well with an increased gas factor, which consists in lowering into the well an installation including a column of elevator pipes, a liner with a packer installed on it, which ensures separation of the upper and lower exploited layers, deep sucker-rod pump for lifting formation fluid from two reservoirs, the inputs of which are communicated with the over-packer space and the under-packer space through the suction valves, and the outlet is communicated with olostyu string of tubing through the discharge valve, the downhole pipeline for discharging gas from the associated packer space; according to the invention, the installation is provided with a transition element providing hydraulic connection of the under-packer space of the well through the liner with one of the suction valves of the deep-well pump and separation of associated gas from the formation fluid due to multiple changes in the transition the directional element of the fluid passing through it from the lower reservoir, with a constant discharge of released gas through the downhole pipeline in line oil gathering at the wellhead or in the over-packer cavity of the well above a dynamic level.
The problem is also solved due to the fact that the installation for the implementation of the method of simultaneous and separate operation of two layers in a well with a high gas factor, including a column of elevator pipes, a liner with a packer installed on it, a deep-well pump with two suction valves at the intake, one of which is placed on its side surface, and a discharge valve at the outlet into the cavity of the column of elevator pipes, a pipeline for venting associated gas from the under-packer space, according to the invention It is additionally equipped with a transition element with a system of longitudinal channels connected in series with each other, providing hydraulic connection of the under-packer space of the well through the liner with the suction valve of the deep-well sucker rod pump, while the inlet of the associated gas pipe is hydraulically connected to the upper section of the system of longitudinal channels of the transition element, and the pipeline configured to divert gas to the oil gathering line at the wellhead or into the overpack cavity of the well above the dyne Cesky level.
The installation may also contain a check valve installed in the upper part of the downhole pipeline above a dynamic level.
The essence of the method of simultaneous and separate operation of two layers in a well with a high gas factor and installation for its implementation is illustrated by the following drawings:
figure 1 presents the installation diagram for simultaneous and separate operation of two layers in the well for the case when the pressure of the upper reservoir is greater than the pressure of the lower reservoir; figure 2 - installation diagram for simultaneous and separate operation of two layers in the well for the case when the pressure of the lower reservoir is greater than the pressure of the upper reservoir; figure 3 is a diagram of the installation for simultaneous and separate operation of two layers in the well for the case when the output of the downhole pipeline is in communication with the above-packer cavity of the well above a dynamic level.
To implement the method of simultaneous and separate operation of two layers, when the pressure of the upper layer is greater than the pressure of the lower layer (Fig. 1), a unit is lowered into the well 1, which includes a column of elevator pipes 2, a deep-well rod pump 3, the cylinder of which is equipped with a lower 4 and a side 5 suction valves. The lower suction valve 4 through the transition element, which includes a system of longitudinally (concentrically) arranged and sequentially hydraulically connected channels 6, 7, 8, is hydraulically connected to the liner 9, in the lower part of which there is a packer 10, hermetically disconnecting the casing 11 of the well 1 to the sub-packer 12 and nadpakernoe 13 cavity associated with the lower 14 and upper 15 productive formations through perforations 16 and 17, respectively. The upper part of the system of longitudinal channels of the transition element, where the outlet of the channel 6 and the inlet of the channel 7 (Fig. 1) are located, is hydraulically connected to the inlet of the downhole pipe 18 for venting gas from the under-packer cavity of the well, and the outlet of the channel 8 is hydraulically connected to the suction valve 4. Inside the pump cylinder 3 is arranged to move the plunger 19 with the discharge valve 20. The plunger 19 is connected to the rocking machine 22 located at the wellhead by means of a string of rods 21 located inside the string of lift pipes 2. The inner cavity 23 of the column of elevator pipes 2 and the outlet of the downhole pipe 18 are hydraulically connected to the oil gathering line 24.
To implement the method of simultaneous and separate operation of two layers in the case when the pressure of the lower layer is higher than the pressure of the upper layer (Fig. 2), a transition element is used in the installation for implementing the method, in which the outlet of the channel 6 is connected to the side valve 5 of the rod pump 3, and the upper part of the transition element, where the outlet of the channel 8 and the entrance of the channel 7 are located, is hydraulically connected to the inlet of the downhole pipeline 18.
The evolved associated gas from the under-packer cavity 12 can also be discharged into the super-packer cavity 13 of well 1. In this case, the downhole pipe 18 is made and fixed on the column of lift pipes 2 so that its outlet is located in the super-packer cavity above the dynamic level of well 1 (Fig. 3).
The method of simultaneous and separate operation of two layers in the well is as follows.
Option 1 (figure 1). The pressure of the upper reservoir in the well is greater than the pressure of the lower reservoir.
When moving up the column of pump rods 21, connected with the pumping unit 22, the plunger 19 moves simultaneously upward inside the cylinder of the pump 3, while the discharge valve 20 is closed, in the cavity 25 of the cylinder of the pump 3 located under the plunger 19, the pressure decreases below the reservoir pressure P H lower layer 14.
Formation fluid from the lower reservoir 14 through the perforations 16 enters the sub-packer cavity 12 of the casing 11 and then through the liner 9 enters the channel 6. The free gas released from the reservoir fluid, while moving along with it along the liner 9 up. When the formation fluid flows from channel 6 to channel 7, the direction of movement of the formation fluid is reversed. In this case, the flow velocity of the formation fluid is less than the velocity of ascent of gas bubbles. Free gas released from the formation fluid in channels 6 and 7 rises into the pipeline 18 and then to the oil gathering line 24 at the wellhead or into the overpack cavity 13 of the well 1 above the dynamic level and from there through the piping of the wellhead (not shown) to the oil gathering line 24 Degassed formation fluid from channel 7 flows into channel 8 and through the lower suction valve 4 enters the cavity 25 of the cylinder of the pump 3. With the further movement of the plunger 19, the side suction valve 5 opens, due to the fact that the reservoir The reservoir pressure P B of the upper reservoir 15 is greater than the reservoir pressure P H of the lower reservoir 14, the lower suction valve 4 is closed and the flow of formation fluid from the lower reservoir 14 is stopped. In this case, the reservoir fluid from the upper reservoir 15 passes through the perforations 17 into the internal cavity 13 casing string 11, where it is naturally degassed and then through an open lateral suction valve 5 enters the cavity 25 of the cylinder of the pump 3. With the pressure valve 20 closed, the pressure in the cavity of the 23 columns of the elevator pipes 2 rises and the formation fluid enters the wellhead into the oil gathering line 24. Reverse flow of the formation fluid from the oil gathering line 24 into the well 18 or into the over-pack cavity 13 of the well 1 (Fig. 3) prevents the check valve 26 installed in the upper part downhole pipeline 18 is above a dynamic level.
During the movement of the string of pump rods 21 and the associated plunger 19 downward, the pressure in the cavity 25 of the downhole pump 3 rises, while the lateral suction valve 5 is closed, the formation fluid from the cavity 25 through the open discharge valve 20 of the plunger 19 enters the cavity 23 of the lift pipe string 2. The cycles are repeated. In this case, the free gas is diverted from the lower reservoir 14 to the oil gathering line 24 continuously when the column of pump rods 21 moves up and down.
Option 2 (figure 2). The pressure of the lower reservoir in the well is greater than the pressure of the upper reservoir.
When moving up the column of pump rods 21, connected with the pumping unit 22, the plunger 19 moves simultaneously upward inside the cylinder of the pump 3, while the discharge valve 20 is closed, in the cavity 25 of the cylinder of the pump 3 located under the plunger 19, the pressure decreases below the reservoir pressure P B of the upper formation 15. The formation fluid from the reservoir 15 through the perforations 17 passes into the inner cavity 13 of the casing 11, where it is naturally degassed and then through the open lower suction valve 4 it enters cavity 25 of the pump cylinder 3. With a further upward movement of the plunger 19, the side suction valve 5 opens, due to the fact that the reservoir pressure P H of the lower reservoir 14 is greater than the reservoir pressure P B of the upper reservoir 15, the lower suction valve 4 closes and the flow of reservoir fluid from the upper reservoir 15. In this case, the reservoir fluid from the lower reservoir 14 through the perforations 16 enters the sub-packer cavity 12 of the casing 11 and then through the liner 9 enters anal 8. The free gas released from the reservoir fluid, moving with the formation fluid upwardly. When the formation fluid flows from channel 8 to channel 7, the direction of movement of the formation fluid is reversed. In this case, the flow velocity of the formation fluid is less than the velocity of ascent of gas bubbles. Free gas from channels 8 and 7 rises into the pipeline 18 and then to the oil gathering line 24 or to the overpack cavity 13 of the well 1 above the dynamic level and from there through the piping of the wellhead (not shown) to the oil gathering 24. The degassed formation fluid from the channel 7 flows into channel 6 and through a side suction valve 5 enters the cavity 25 of the cylinder of the pump 3. When the discharge valve 20 is closed, the pressure in the cavity 23 of the column of elevator pipes 2 rises and the reservoir fluid enters the oil gathering line 24 at the wellhead 24. Reverse flow The formation fluid from the oil recovery line 24 to the downhole pipe 18 or to the over-packer cavity 13 of the well 1 prevents the check valve 26, which is installed in the upper part of the downhole pipe 18 above a dynamic level.
During the movement of the string of pump rods 21 and the associated plunger 19 downward, the pressure in the cavity 25 of the downhole pump 3 rises, while the lateral suction valve 5 is closed, the formation fluid from the cavity 25 through the open discharge valve 20 of the plunger 19 enters the cavity 23 of the lift pipe string 2. The cycles are repeated. In this case, the free gas is diverted from the lower reservoir 14 to the oil gathering line 24 or to the over-packer cavity 13 of the well 1 continuously when the column of pump rods 21 moves up and down.
Thus, the technical result, which consists in the separation and removal of associated gas contained in the reservoir fluid produced from the lower sub-packer reservoir at the same time as a separate production method, is ensured by the use of a transition element with a system of longitudinal channels hydraulically connected in the apparatus for implementing this method between each other, and the downhole pipeline for the removal of gas at the wellhead. In addition, the connection of the inlet of the downhole pipeline with the system of longitudinal channels of the transition element, and not directly with the suction chamber of the sucker rod pump, provides a complete and continuous removal of gas from the reservoir fluid coming from the sub-packer space.
Information sources
1. RU 2391493, IPC F04B 47/02, publ. 06.06.10.
2. RU 2351801, IPC F04B 47/02, publ. 2007.11.02.
3. RU 2221136, IPC Е21В 43/14, publ. 2004.01.04.
4. RU 59138 U1, IPC Е21В 43/14, publ. 2006.12.10.

Claims (3)

1. The method of simultaneous and separate operation of two layers in a well with an increased gas factor, which consists in lowering a unit into the well, including a column of elevator pipes, a liner with a packer installed on it, providing separation of the upper and lower exploited layers, a deep-well sucker rod pump for raising the formation fluid of two layers, the inlets of which are communicated with the overpacker space and the underpacker space through the suction valves, and the outlet is communicated with the cavity of the column of elevator pipes through the supercharger th valve, downhole pipeline for venting associated gas from the under-packer space; the rise of formation fluid from two layers along the column of elevator pipes at the wellhead, characterized in that they provide the installation with a transition element that provides hydraulic connection of the under-packer space of the well through the liner with one of the suction valves of the deep-well pump and separation of associated gas from the formation fluid due to multiple changes in the transition element of the direction of the fluid passing through it from the lower reservoir, with a constant discharge of released gas through the downhole pipeline in line oil gathering at the wellhead or in the over-packer cavity of the well above a dynamic level.
2. Installation for implementing the method according to claim 1, comprising a column of elevator pipes, a liner with a packer installed on it, a sucker-rod pump with two suction valves at the inlet, one of which is placed on its side surface, and a discharge valve at the outlet to the column cavity lift pipes, a pipeline for the removal of associated gas from the under-packer space, characterized in that it is additionally equipped with a transition element with a system of longitudinal channels connected in series with each other, providing hydraulic the connection between the under-packer space of the well through the liner and the suction valve of the deep-well sucker-rod pump, while the inlet of the gas conduit is hydraulically connected to the upper section of the system of longitudinal channels of the transition element, and the outlet of the conduit is designed to divert gas to the oil gathering line at the wellhead or to the over-pack the well cavity is above the dynamic level.
3. The installation according to claim 2, characterized in that it contains a check valve installed in the upper part of the downhole pipeline above a dynamic level.
RU2012135325/03A 2012-08-16 2012-08-16 Dual string production method in well with increased gas ratio and device for its implementation RU2513566C2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2566844C1 (en) * 2014-11-14 2015-10-27 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Double-tubing string installation for dual operation of two strata with one well
RU2572041C2 (en) * 2014-04-15 2015-12-27 Общество с ограниченной ответственностью "ЛУКОЙЛ-Инжиниринг" (ООО "ЛУКОЙЛ-Инжиниринг") Equipment for dual bed operation for oil- and gas-bearing formations in well
EA030727B1 (en) * 2015-12-31 2018-09-28 Республиканское Унитарное Предприятие "Производственное Объединение "Белоруснефть" Method for selective periodical exploitation of low-permeable formations and device for implementing the same
EA035282B1 (en) * 2017-12-21 2020-05-25 Республиканское Унитарное Предприятие "Производственное Объединение "Белоруснефть" System for simultaneous-separate oil production using an integrated bar pump, and method for installing the system in a well

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SU724693A1 (en) * 1975-07-17 1980-03-30 Куйбышевский политехнический институт им. В.В.Куйбышева Deep-well pumping unit for oil production
SU1087689A1 (en) * 1983-04-06 1984-04-23 Волгоградский государственный научно-исследовательский и проектный институт нефтяной промышленности Combined liquid lift
US5335732A (en) * 1992-12-29 1994-08-09 Mcintyre Jack W Oil recovery combined with injection of produced water
RU59138U1 (en) * 2006-03-13 2006-12-10 Общество с ограниченной ответственностью "ЛУКОЙЛ-ПЕРМЬ" Installation for simultaneously separate operation of two layers in a well (options)
RU65964U1 (en) * 2006-09-05 2007-08-27 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Device for oil production from waterful produced layer
RU2007114215A (en) * 2007-04-16 2008-10-27 ООО НИИ "СибГеоТех" (RU) Method for simultaneous-separate oil production from one well with submersible pump installation (options)

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SU724693A1 (en) * 1975-07-17 1980-03-30 Куйбышевский политехнический институт им. В.В.Куйбышева Deep-well pumping unit for oil production
SU1087689A1 (en) * 1983-04-06 1984-04-23 Волгоградский государственный научно-исследовательский и проектный институт нефтяной промышленности Combined liquid lift
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2572041C2 (en) * 2014-04-15 2015-12-27 Общество с ограниченной ответственностью "ЛУКОЙЛ-Инжиниринг" (ООО "ЛУКОЙЛ-Инжиниринг") Equipment for dual bed operation for oil- and gas-bearing formations in well
RU2566844C1 (en) * 2014-11-14 2015-10-27 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Double-tubing string installation for dual operation of two strata with one well
EA030727B1 (en) * 2015-12-31 2018-09-28 Республиканское Унитарное Предприятие "Производственное Объединение "Белоруснефть" Method for selective periodical exploitation of low-permeable formations and device for implementing the same
EA035282B1 (en) * 2017-12-21 2020-05-25 Республиканское Унитарное Предприятие "Производственное Объединение "Белоруснефть" System for simultaneous-separate oil production using an integrated bar pump, and method for installing the system in a well

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