RU2380525C1 - Method of two reservoirs sumultanious-separate production - Google Patents

Abstract

FIELD: oil-and gas industry.

SUBSTANCE: method includes descending a tubing string with a parker, equipped with an anchor, till the required installation interval, the anchor fixing with the parker installation between reservoirs, descending a pump and reservoir product extraction, simultaneous or separate. According to the method descend the parker with the anchor and additional rotation drive on a cable, which length is efficient enough the parker installation between reservoirs with the pump, located lower then a both reservoirs fluid level. After that fix the cable on the tubing string, equipped with the submersible pump with an additional cable of capacity efficient enough to extract both reservoir products. Descend the tubing string with cables into the borehole until parker dislocation between reservoirs. Install the parker with anchor between reservoirs supplying voltage via motor. Start up the pump supplying voltage with additional cable. Define upper reservoir capacity. Then supplying reverse voltage via cable to the drive, return the parker with anchor into bypass position. Then start up the pump supplying voltage with additional cable. In result define hydrodynamic properties of the lower level according to the first research. According to the research results select parkers with anchor mounting-dismounting period at the pump constantly working for the optimal production from the upper reservoir at the parker mounted till the fluid level decreases lower then the dynamic level of the less productive reservoir and higher then the top pump or from the both reservoirs at parker dismounted till dynamic fluid level is less then productive reservoirs one.

EFFECT: method efficiency increase.

3 cl, 1 dwg

Description

The proposed development relates to the oil industry, namely to downhole pumping units that provide simultaneous separate operation of two layers.

It is known "Device for regulating fluid withdrawal during the operation of the well" (patent RU No. 44742, ЕВВ 43/12, 43/14, published in BI No. 9 of 03/27/2005), by which the method of simultaneous separate operation of two layers, including the descent of the pipe string with a packer equipped with a lower stop, over which an elastic sleeve is placed, with a shank and a mandrel with an upper pipe connected to the pipe string, until the liner stops against the bottom, and then it is inserted into the elastic sleeve with the weight of the pipe string of the mandrel, to pressing elastic the cuff to the walls of the well between the layers, detachment of the nozzle mandrel and retrieval from the well pipe string, installing a differential valve port, the capacity of which is determined after a preliminary study formation productivity, pump descent and subsequent operation of these two plateaus one pump

The disadvantages of this method is the need for three stages of hoisting operations: the descent and installation of the packer between the layers, the installation of a differential valve, the descent of the pump, as well as the narrow technological capabilities: the method can be used only when the reservoir pressure of the lower reservoir is greater than the reservoir pressure of the upper reservoir, in this case, in case of changes in the ratio of reservoir pressures between the upper and lower reservoir, production from them will be ineffective and may lead to premature colmatization or watering of one of the layers, and also the method involves the use of structures with a metal shank, based on the bottom, which makes the method in the aggregate metal-intensive and expensive.

It is also known "Device for the separate operation of two layers of the same well" (patent RU No. 2252510, ЕВВ 43/14, published in BI No. 18 of 06/27/2005), by which the method of simultaneous separate operation of two layers, including descent pipe columns with a packer equipped with a lower stop, over which an elastic sleeve is placed, with a shank and a drone with an upper nozzle connected to a control device consisting of a housing connected to the packer from below and telescopically with a pipe string from above, with a figured groove and slide with a spring-loaded branch pipe with a fixing pin interacting with a figured groove, on the outside, a blank partition and a valve located above above, dividing the internal space of the body into the lower, middle and upper chambers, equipped with the corresponding rows of radial channels, run down to the end of the liner end face subsequent introduction into the elastic cuff under the weight of the mandrel pipe string, until the elastic cuff is pressed against the walls of the well between the layers, the pump is lowered into the pipe string to select formation products, giving the column of pipes a reciprocating movement, the field of each of which a pipe with an internal cavity and a fixing pin due to the figured groove moves stepwise to the second and third position up, then sharply down to the first position, etc., and these provisions respectively allow production by pump : firstly, from the upper layer through the upper and middle rows of radial channels; secondly, from the upper layer through the upper row of channels, the lower layer through the shank, lower chamber, lower row of channels, the internal cavity of the pipe, the middle row of channels and the valve; thirdly, only from the lower layer through the liner, lower chamber, lower row of channels, the internal cavity of the pipe, the middle and upper rows of channels.

The disadvantages of this method is the need for two stages of hoisting operations: the descent and installation of the packer between the layers, the descent of the pump, and the method involves the use of structures with a metal-intensive shank, based on the bottom, which makes the method together metal-intensive and expensive, with a large dependence the effectiveness of the method from the human factor, if the control over the number of reciprocating movements of the pipe string is not carried out properly, it is difficult to determine in which specific Tnom position is fitting.

The closest in technical essence and the achieved result is "Device for the separate operation of two layers of one well" (patent PM RU No. 65122, ЕВВ 43/00, published in BI No. 21 dated 07/27/2007), by which the method is carried out simultaneous separate operation of two layers, including the descent of the pipe string with a packer equipped with a lower stop, over which an elastic sleeve is placed, with a shank equipped with an anchor, and an upper stop with a pipe connected to a control device consisting of a housing connected to cerque bottom and telescopically with a column of pipes on top, with a figured groove and a movable, spring-loaded pipe with a fixing pin interacting with the figured groove, on the outside, a blank partition and a valve located above, dividing the inner space of the case into the lower, middle and upper chambers, equipped the corresponding rows of radial channels, the descent is carried out to the required installation interval, the anchor is fixed relative to the well, followed by compression of the elastic cuff between the stops under the weight of the column tr ub, before pressing the elastic cuff, which takes the form of two directional self-sealing cuffs, against the walls of the well between the strata, lowering the pump into the pipe string to select the production of the strata, giving the pipe string a reciprocating movement, each of which has a pipe with an internal cavity and a fixing pin due to the figured the groove moves stepwise to the second and third position up, then sharply down to the first position, etc., and these positions respectively allow production by pump: O, from an upper layer through the top and middle rows of radial channels; secondly, from the upper layer through the upper row of channels, the lower layer through the shank, lower chamber, lower row of channels, the internal cavity of the pipe, the middle row of channels and the valve; thirdly, only from the lower layer through the liner, lower chamber, lower row of channels, the internal cavity of the pipe, the middle and upper rows of channels.

The disadvantages of this method is the need for two stages of hoisting operations: the descent and installation of the packer between the layers, the descent of the pump, while the method is highly dependent on the human factor: if the number of reciprocating movements of the pipe string is not properly controlled, it is difficult to determine in what specific position is the pipe, which has three installation positions.

An object of the invention is to create a method that does not depend on the human factor due to the use of a packer having two positions with the possibility of programming, simple and cheap to use due to one descent of all equipment with a packer and, if necessary, lifting at a time used to implement the method equipment.

The technical problem is solved by the simultaneous separate operation of two layers in the well, including lowering the pipe string with a packer equipped with an anchor to the required installation interval, fixing the armature with the packer between the layers, lowering the pump and selecting formation products, joint or separate.

What is new is that the packer with the armature and the additional rotating electric drive is lowered on the cable, the length of which is selected sufficient to install the packer between the layers, that the packer with the armature and the additional rotating electric drive is lowered on the cable whose length is selected sufficient to install the packer between the layers with the pump, placed below the liquid level of both boards, after which the cable is mounted on a pipe string equipped with a pump that is electrically submersible and equipped with an additional cable with a productive sufficient for pumping out the products of both layers, after which the pipe string with cables is lowered into the well until the packer is placed between the layers, the packer with the armature between the layers is installed using an electric motor through a cable, and the pump is started by supplying voltage through an additional cable, as a result, it is determined the productivity of the upper layer and the chemical and physical properties of the products of this layer, after which, by applying reverse voltage through the cable to the electric drive, the packer and anchor are returned to the transport floor Then the pump is started by an additional cable, as a result, based on the first study, the hydrodynamic properties of the lower formation and the chemical and physical properties of the products of this formation are determined, the results of these studies are selected for the frequency of installation and removal of the packer with the anchor with the pump constantly on for optimal production from the upper layer with the packer installed until the production level drops below the dynamic level of the less productive layer and above the upper pump or from both layers when removed Acker to enhance hydrodynamic level to less productive formation.

It is also new that a packer with an anchor is equipped with a geophysical sensor before lowering, for example, a pressure sensor, the readings of which about the state of the lower layer when the packer with an anchor installed between the pastes are transmitted to the surface via a cable with which the sensor is electrically connected.

It is also new that reservoir studies are periodically repeated, according to the results of which they adjust the pump performance and the frequency of installation and removal of the packer with an anchor when the pump is constantly on.

The drawing shows a diagram of a pumping unit for implementing the method.

A pump installation for simultaneous separate operation of the upper 1 and lower 2 layers in the well 3 contains a column of elevator pipes 4, cable 5, a packer 6 with an armature 7 and a rotating electric drive 8 (shown conditionally) installed between layers 1 and 2, pumps 9 (shown conventionally ) for pumping out the products of formations 1 and 2. The pump 9 is electrically submersible, connected to an additional cable 5 ', lowered parallel to the cable 5 with the pipe string 4. The packer 6 with the anchor 7 from the bottom can also be equipped with a geophysical sensor 10.

The method is as follows.

As a result of preliminary studies of the productivity of formations 1 and 2, pump 9 is selected according to the productivity of pump 9. Then, a cable 5 of sufficient length is inserted into the well to install a packer 6 between formations 1 and 2 with pump 9 located below the fluid level (not shown). well 3 of both boards 1 and 2, the electric drive 8 with the packer 6, made with the possibility of installation by rotation (see, for example, patent RU No. 2087672). Moreover, in the packer 6, the drive mechanism (not shown in the diagram) and the electric drive 8 are connected rigidly.

The author does not claim to specific constructions of packer 6, since in the method, as technically packer 6 with electric drive 8 and anchor 7, any technically possible constructions can be used.

Then, a column of elevator pipes 4 with a pump 9 is lowered into the well 3 together with cable 5 or cables 5 and 5 '. Upon reaching the installation interval of the packer 6 between layers 1 and 2, a voltage is applied from the mouth of the cable 5, which rotates the drive mechanism of the packer 6 using an electric drive 8 and, as a result, installs a packer 6 with an anchor 7 between layers 1 and 2, which is fixed by devices (not shown in Fig.) at the mouth by increasing current consumption (packer landing force 6). The packer 6 is fixed by the anchor 7, which are part of the packer 6. Then, voltage is supplied to the pump 9 via an additional cable 5 '. As a result, the pump 9 pumps the products of the upper layer 2 from the overpacker space 11 along the column of elevator pipes 4 to the surface. After productivity studies, board 1 in terms of the rate of decline and recovery (after stopping pump 9) of the liquid level in the well 3 hydrodynamic properties (productivity, permeability, dynamic pressure (level)) of the upper formation 1. Moreover, if the packer 6 is equipped with a geophysical sensor 10, its readings removed via cable 5, determining the static pressure of the lower layer 2. Then, by applying reverse voltage through cable 5 to electric drive 9, packer 6 and anchor 7 are returned to the transport position. Next, the pump 9 is started via the additional cable 5 ', as a result, the hydrodynamic properties of the lower layer 2 are determined based on the first study by the rate of decrease and recovery (after stopping the pump 9) of the liquid level in the well 3, based on the results of these studies, the installation frequency is selected and removal of the packer 6 with the anchor 7 when the pump 9 is constantly on for optimal production from the upper reservoir 1 with the packer 6 installed to reduce the level of production below the dynamic level of a less productive area that 1 or 2 and above the upper pump 9 or from both layers 1 and 2 with the packer 6 removed to raise the level to a hydrodynamic level of a less productive layer 1 or 2.

Consider two possible options for using the method when operating well 3 with two layers 1 and 2:

1. When the productivity of the lower formation 2 is lower than the productivity of the upper 1. In this case, the packer 6 blocks the internal space of the well 3. In this case, the pump 9 pumps out the production of the upper formation 1 to lower the fluid level below the dynamic level provided by the formation pressure of the lower formation 2, but above the pump inlet 9. After that, the packer 6 is removed (returned to the transport position), as a result, the products of the lower formation 2, due to their own reservoir pressure, enter the well 3, from where the pump 9 is pumped out together with the production of the upper its reservoir 1 until the fluid level reaches a dynamic level due to the in-situ pressure of the lower reservoir 2. Then, similarly, the process is periodically repeated.

2. When the productivity of the lower layer 2 is higher than the productivity of the upper 1. In this case, when packer 6 is removed from the well 3, the products of the upper 1 and lower 2 layers are pumped out by the pump until the fluid level rises to the dynamic level of the upper layer 1. Then, the packer 6 blocks the interior of the well 3. In this case, the pump 9 pumps out the products of the upper reservoir 1 to a decrease in the liquid level below the dynamic level provided by the reservoir pressure of the upper reservoir 1, but above the inlet of the pump 9. After that, the packer 6 is removed (returned to Tranfer position), resulting in production of the upper layer 1 due to its own reservoir pressure enters the hole 3, where the pump 9 pumped together with the top layer 1. Next products similar process is repeated periodically.

It should be borne in mind that the static level of reservoir 1 or 2 is higher than dynamic, since during the operation of the pump 9 the in-situ pressure at the inlet to the well 3 decreases, which is determined by the studies of reservoirs 1 and 2.

Moreover, both of these processes of installing and removing the packer 6 can be mechanized by equipping the control unit with a programmable command unit (not shown in Fig.).

In cases of long-term operation of well 3 with two layers 1 and 2, their productivity (the level of pumped liquid decreases to a level close to the inlet of pump 6) and the water cut (for example, to 70-90%) changes. To adjust the performance of the pump 9 and the frequency of installation and removal of the packer 6 with the anchor 7 with the pump 9 constantly on, studies of formations 1 and 2 are periodically repeated, similar to the method described above. After that, well 3 is operated with new parameters until the next study.

To remove the pumping unit from the well 3, the packer 6 with the anchor 7 with the drive 8 is returned to the transport position and the entire installation is removed from the well.

Since packer 6 has only two positions (installed (working) or transport), therefore, in what position it is located, it is checked by applying voltage through cable 5: if the current consumption increases gradually, and then increases sharply, then packer 6 was in the transport position; if the current consumption starts to increase sharply, then the packer 6 with the anchor 7 is already installed. You can also check the reverse (reverse) voltage: if the consumed current starts to grow sharply, then packer 6 is in the transport position; if the current consumption gradually decreases, and then increases sharply (the drive mechanism of the electric drive 9 reaches the stop), then the packer 6 with the anchor 7 were installed. Therefore, it is impossible to make a mistake in what position the packer 6 is located: when voltage is applied, it is always transferred to the working position, and when the opposite is applied, to the transport position.

The proposed method for the simultaneous separate operation of two layers in a well is not dependent on the human factor due to the use of a packer having two positions with the possibility of programming, it is simple and cheap to use due to one descent of all equipment with a packer and, if necessary, lifting at a time used for the implementation of the method of equipment.

Claims (3)

1. The method of simultaneous separate operation of two layers in the well, including lowering the pipe string with a packer equipped with an anchor to the required installation interval, fixing the armature with the packer between the layers, lowering the pump and selecting production of layers, joint or separate, characterized in that the packer with the anchor and an additional rotating electric drive are lowered onto the cable, the length of which is selected sufficient to install the packer between the layers with a pump placed below the liquid level of both layers, after which the cable got stronger it is installed on a pipe string equipped with an electric submersible pump and equipped with an additional cable with a capacity sufficient for pumping out the products of both layers, after which the pipe string with cables is lowered into the well until the packer is placed between the layers, the packer is installed using the electric motor by supplying direct voltage through the cable with an anchor between the layers, and by supplying voltage through an additional cable, the pump is started, as a result, the productivity of the upper layer is determined, then by applying a reverse voltage with the cable to the electric drive, the packer and the anchor are returned to the transport position, then the pump is started using the additional cable, as a result, based on the first study, the hydrodynamic properties of the lower layer are determined, according to the results of these studies, the frequency of installation and removal of the packer with the anchor with the pump constantly on is selected for optimal production from the upper reservoir with the packer installed until the fluid level drops below the dynamic level of the less productive reservoir and above the upper pump or from both when the packer is removed until a dynamic fluid level of a less productive formation is reached. 2. The method of simultaneous separate operation of two layers in a well according to claim 1, characterized in that the packer with an anchor is equipped with a geophysical sensor before lowering, for example, a pressure sensor, the readings of which about the state of the lower layer when the packer with the anchor is installed between the layers are transmitted to the surface by the cable to which the sensor is electrically connected. 3. The method of simultaneous separate operation of two layers in a well according to claim 1 or 2, characterized in that the formation studies are periodically repeated, according to the results of which the pump performance and the frequency of installation and removal of the packer with the anchor when the pump is constantly on are adjusted.

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