RU2549946C1 - Pump packer system for multiple-zone well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: pump packer system includes a packer lowered into the well and put between formations and a pump unit above it, which consists of an electric motor with a cable, hydroprotection, telemetering, lower and upper pumps with receiving stations and a casing with a cable entry, the upper end of which envelopes the receiving station of the lower pump, and the lower end is located below the electric motor. The system is provided with a housing and a branch pipe with side outlet channels, the first one of which is connected from above to the lower end of the casing, and the second one is connected from above to the electric motor and from below to the packer. With that, the branch pipe is compacted in the housing and thus disconnects the cavity of the casing from the upper formation and connects it through side outlet channels to the lower formation. With that, the branch pipe is provided for fluid of the lower formation either with a control controlled with the electric motor or with a flow meter or with a mechanical check valve. The upper pump is connected with the receiving station to the lower pump, and the latter that is located above the casing is connected with the receiving station to the hydroprotection of the electric motor. With that, the receiving station of the lower pump is made in the form of an inlet module or a gas disperser, and the receiving station of the upper pump is made either in the form of an inlet module provided with a longitudinal through internal channel for a fluid flow of the lower formation and a cutoff with a side inlet channel for the fluid flow of the upper formation, which is controlled by electric, electromagnetic or hydraulic action, or in the form of an inlet module or a gas separator provided from below with a branch pipe with side outlet channels at backside of the well for fluid flow of the lower formation. The packer is either of mechanical action and is installed by creation on it, without any transfer to the casing, of the specified value of axial load from the weight of the pipe string with further maintenance or removal of this load after tight fit of the packer, or is of hydraulic action, provided with a disconnector and installed between formations before the pump unit is lowered by creation inside the packer of excess pressure, or is of hydrodynamic action and provided inside the well with a pulse tube transmitting discharge pressure of the upper pump to the hydraulic cylinder of the packer, or is of electric or electromagnetic action and is connected to the electric motor.

EFFECT: improving reliability and efficiency of a pump unit at simultaneous and separate operation of two formations of one and the same well.

5 dwg

Description

The invention relates to techniques and technologies for oil production and can be used for simultaneous and separate operation by pumping of two layers of one well separated by a packer.

Known RF patent No. 2493359, developed by NovometPerm CJSC, "Pump packer installation for simultaneous and separate operation of two layers", containing a pipe string, cable, a casing with a shank, a twin-screw pump with an electric motor and a packer between the layers.

Known RF patent No. 2488688, developed by NTP Neftegaztekhnika LLC, “Pump packer cable system for simultaneous and separate exploration and operation of a multilayer well”, which includes launching packer pipes with a disconnector, an electric motor with double-sided shafts into the well, the upper of which is connected with pump, and the bottom with a shut-off valve.

Known RF patent No. 2344274, developed by Research Institute SibGeoTech LLC and NTP Neftegaztekhnika LLC, “Method for simultaneous and separate oil production from formations of one well with a submersible pump installation”, the method includes lowering at least a packer into a well on a pipe string and two electric submersible pumps with electric motors.

These known solutions are less reliable, more expensive, structurally complex and difficult to implement in practice.

The aim of the invention is to increase the reliability and increase the efficiency of the pumping unit during simultaneous and separate operation of the fluid from two layers of the same well.

The main technical, technological result and economic effect of the application of the invention are achieved due to the possibility of a separate study of the parameters of the layers with their subsequent joint operation with the achievement of rational bottomhole pressures.

The pump packer system includes a packer lowered into the well and planted between the strata and above it, a pumping unit consisting of an electric motor with cable, hydraulic protection, telemetry, lower and upper pumps with receiving units and a casing with cable entry, the upper end of which covers the lower receiving unit pump, and the lower end is located below the electric motor.

The objective of the invention is achieved due to the following technical solutions.

The pump packer system is equipped with a housing and a pipe with lateral output channels, the first of which is connected from above to the lower end of the casing, and the second is connected from above to the motor and from below to the packer. In this case, the nozzle, being compressed in the body, divides the casing cavity from the upper layer and communicates it through the lateral output channels with the lower layer. Moreover, the nozzle is equipped for the fluid of the lower reservoir or a regulator controlled by an electric motor, or a flow meter, or a mechanical check valve.

The upper pump is connected by the receiving unit to the lower pump, and the latter, located above the casing, is connected by the receiving unit to the hydraulic protection of the electric motor. In this case, the receiving unit of the lower pump is made in the form of an input module or a gas disperser, and the receiving unit of the upper pump is made either in the form of an input module equipped with a longitudinal through internal channel for the flow of fluid from the lower reservoir and a cut-off with a side inlet for the flow of fluid of the upper reservoir controlled by an electric , by electromagnetic or hydraulic action, or in the form of an input module or gas separator, equipped with a bottom pipe with lateral output channels in the borehole for the flow of flui yes lower layer.

The packer is either made of mechanical action and installed by creating on it, without transferring to the casing, the specified value of the axial load from the mass of the pipe string with subsequent maintenance or removal of this load after the packer is sealed, or the hydraulic action is performed, equipped with a disconnector and installed between the layers before descent a pump installation by creating excess pressure inside the packer, or it has a hydrodynamic effect and is equipped inside the well with a pulse tube transmitting discharge pressure e of the upper pump into the hydraulic cylinder of the packer, or it is made of electric or electromagnetic action and is equipped with an additional cable that transmits current through the electric motor to the packer.

In figures 1-5 shows the layout with various designs.

The pump packer system (FIGS. 1-5) includes a packer 4 (mechanical, hydraulic, hydrodynamic or electrical action) lowered into the well 1 and set between the layers 2 and 3 and above it a pumping unit.

The pump installation consists of an electric motor 5 with cable 6, telemetry 7, hydraulic protection 8, lower 9 and upper 10 pumps. In this case, the lower pump 9 is equipped with a receiving unit 11 in the form of an input module or a gas disperser. The upper pump 10 is equipped with a receiving unit 12, made either in the form of an input module (Figs. 1, 2, 5), equipped with a longitudinal through internal channel 13 for the fluid flow of the lower reservoir 2 and a cut-off 14 (electric, electromagnetic or hydraulic action) with a side input channel 15 for the fluid flow of the upper reservoir 3, or in the form of an input module or gas separator (Fig.3,4), equipped with a bottom pipe 16 with lateral output channels 17 in the annulus 18 of the well 1 for the fluid flow of the lower reservoir 2. The pump installation also includes yourself to flop 19 with cable entry 20. The upper end of the casing 19 covers the receiving unit 11 of the lower pump 9, and its lower end is located below the electric motor 5. Moreover, the casing 19 is rigidly connected from below to the housing 21, and the electric motor 5 is rigidly connected from below to the pipe 22 made with lateral output channels 23. A pipe 22 (Figs. 1-5) is connected from below, directly or through a disconnector 24 (Figs. 3, 4), to a packer 4, moreover, it is sealed in the housing 21 and divides the cavity 25 of the casing 19 from the upper layer 3 and communicates it through the lateral output channels 23 with the lower layer 2.

The pipe 22 is equipped for the fluid of the lower reservoir 2 with either a regulator 26 (Fig. 4) controlled by an electric motor 5, or a flow meter 27 (Figs. 1, 2), or a mechanical check valve 28 (Fig. 3).

The upper pump 10 is connected to the receiving unit 12 with the lower pump 9, and the latter, located above the casing 19, is connected to the receiving unit 11 with the hydraulic protection 8 of the electric motor 5.

The pump packer system is lowered into the well 1 on the pipe string 29. In this case, the packer 4, if mechanical action is performed (Figs. 1, 2), then it is installed by creating on it, without transferring to the casing 19, a predetermined value (for example, 4- 6 t) axial load from the mass of the pipe string 29, with the subsequent maintenance or removal of this load (4-6 t) after the packer 4 is sealed. If the packer 4 is hydraulically operated (Figs. 3, 4), then it is installed between the layers 2 and 3 before starting up the pumping unit by creating inside the packer 4 an excess yes Lenia. If the packer 4 is hydrodynamic (Fig. 5), then it is equipped inside the well 1 with a pulse tube 30, which transfers the discharge pressure of the upper pump 10 to the packer 4 (that is, into its hydraulic cylinder). If the packer 4 is made of electrical or electromagnetic action (figure 5), then it (that is, its working mechanism 31) is associated with the electric motor 5.

The cutter 14, if performed electrical or electromagnetic action, then it (that is, its controlled mechanism) either communicates with the cable 6 of the electric motor 5 (figure 5), or with an individual cable 32 (figure 1). If the cutter 14 is made hydraulic action, then it (that is, its hydraulic cylinder 33) is connected to the impulse tube 34 (figure 2).

After mounting the well 1 through the cable 6, the electric motor 5 is put into operation, while the pumps 9 and 10 operate through the shafts 34 (Fig.1-5). Moreover, the lower pump 9 pumps the fluid from the lower reservoir 2 through the receiving unit 12 (either in a straight line (Fig. 2) or through the annulus 18 of the well 1 (Figs. 3, 4)) to the upper pump 10. And in turn, the upper pump 10 pumps 1 fluid from the lower 2 and upper 3 layers to the wellhead. In this case, the lower pump 9 reduces the pressure in the receiving unit 11 and, accordingly, in the bottom of the lower formation to a rational (calculated) value, and the upper pump 10 reduces the pressure in the receiving unit 12 and, accordingly, in the bottom of the upper layer to the pressure value at the outlet of the lower pump 9. The measurement of the parameters of the lower layer 2 is carried out by telemetry 7 and / or the flow meter 27 in real time through the cable 6 (Fig.1, 2). If necessary, the adjustment of the flow rate of the lower layer 2 is carried out by the regulator 26, controlled through the cable 6 of the motor 9 (figure 4). When the motor 9 and, accordingly, the pumps 9, 10 are stopped, the backflow of fluid from the upper formation 3 to the lower formation 2 is excluded by the mechanical check valve 28 (Fig. 3). To study the parameters of the lower reservoir 2, the shut-off device 14 is forcibly closed and, thereby, the influx of fluid of the upper reservoir 3 into the receiving unit 12 of the upper pump 10 is excluded (FIGS. 1, 2, 5). In this case, both pumps 9 and 10 pump only the fluid from the lower reservoir to the wellhead 1. And with the joint operation of formations 2 and 3, the shut-off device 14 is again opened and thereby ensure the production of fluids from them.

Claims (1)

A pumping packer system for a multilayer well, which includes a packer lowered into the well and set between the layers and pumping unit consisting of an electric motor with cable, hydraulic protection, telemetry, lower and upper pumps with receiving units and a casing with cable entry, the upper end of which covers the receiving unit of the lower pump, and the lower end is located below the electric motor, characterized in that for simultaneous and separate production of fluid from two reservoirs, it is equipped with a housing and a nozzle with lateral passage channels, the first of which is connected from above to the lower end of the casing, and the second is connected from above to the electric motor and from below to the packer, moreover, the nozzle, being sealed in the housing, divides the cavity of the casing from the upper layer and communicates it through the lateral output channels with the lower layer, is equipped for the lower formation fluid with either a regulator controlled by an electric motor, or a flow meter, or a mechanical non-return valve, while the upper pump is connected by a receiving unit to the lower pump, and the last one located above the casing is connected inen by a receiving unit with hydraulic protection of the electric motor, moreover, the receiving unit of the lower pump is made in the form of an input module or a gas disperser, and the receiving unit of the upper pump is made either in the form of an input module equipped with a longitudinal through internal channel for the flow of the fluid of the lower reservoir and a cut-off with a side inlet channel for the flow fluid of the upper reservoir, controlled by electric, electromagnetic or hydraulic action, or in the form of an input module or gas separator, equipped with a bottom pipe with lateral the passages in the annulus of the well for the flow of the fluid of the lower reservoir, the packer either having a mechanical action and installed by creating on it without transmitting to the casing a predetermined value of the axial load from the mass of the pipe string with subsequent maintenance or removal of this load after a tight fit of the packer, or hydraulic action, equipped with a disconnector and installed between the layers before the pump unit is launched by creating excessive pressure inside the packer, or a hydrodynamic action vii and is equipped inside the well with a pulse tube that transmits the discharge pressure of the upper pump to the packer, or it is made of electric or electromagnetic action and is connected to an electric motor.

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