Device for pumping gas-liquid mixture to formation

FIELD: oil and gas industry.

SUBSTANCE: invention pertains to oil industry and can be used in system of out-contour and contour waterflooding during development of oil deposit with maintenance of formation pressure. The concept of the invention is as follows: device contains inner pipe string equipped with chamber for fluid and gas receipt and outer pipe string, encapsulated assembly. At that chamber for fluid and gas receipt communicates with tubing-casing annulus above the encapsulated assembly; it is made as low-pressure chamber of jet pump with ejector installed at the jet pump input, while it output is communicated with inner tubing string. At that delivery of gas is envisaged to tubing-casing annulus with possibility of its suction to low-pressure chamber of the jet pump. Encapsulated assembly is made as packer and installed in the well being a part of inner tubing string above the formation. Beyond the packer and opposite low-pressure chamber of the jet pump inside the inner tubing string there are through radial grooves for gas delivery. Outer piping string is equipped from below with ejector telescoped into the inner piping string at the input of low-pressure chamber of the jet pump with potential axial displacement in regard to inner piping string and regulation of flow passage of through radial grooves with possibility of their sealed cut-off. At that input of the jet pump is communicated with the outer piping string. Below the jet pump output the inner piping string is equipped with diaphragms with the central slotted openings. Each slotted opening of the following diaphragm is shifted per angle of 15-20° towards clockwise or anticlockwise direction. Below diaphragm inside the inner piping string there's tubular smoothing sleeve for liquid-gas mixture.

EFFECT: reducing metal consumption for the device structure, improving quality of gas dispergation in liquid, and intensified mixing of gas-liquid mixture with potential regulation of gas-cutting value for the fluid pumped into the formation.

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The invention relates to the oil industry and can be used in the system zakomornogo and contour flooding of the oil reservoir to maintain reservoir pressure.

A device for injection of gas-liquid mixture in the reservoir (patent RU№2257491, IPC F04B 47/00, publ. in bull. No. 21 dated 27.07.2005,), comprising a fixed cylinder with techniques for liquid and gas, a movable plunger device including suction and discharge valves and two plunger connected by a pipe with a filter, the device has a casing with a sealing site, forming upper and lower chambers with individual methods to gas and liquid, and each of them is connected with the cylinder chamber through the valve.

The disadvantages of this design are:

- first, low productivity plunger device that does not allow gas-liquid mixture for injection multiple injection wells;

- secondly, the low efficiency of mixing of gas and water in the chamber receiving the liquid and gas due to the fact that water is fed from the bottom and the top gas, so part of the gas goes into the annular space;

- thirdly, for mixing gas and liquid gas must be fed into the chamber for receiving liquid and gas under high pressure./p>

The closest in technical essence is a device for pumping a gas-liquid mixture in the reservoir (patent RU №2418192, IPC F04B 47/00, publ. in bull. No. 13, dated 10.05.2011)containing placed in the hole (pit) concentrically inserted into each other the inner string of pipe, equipped with a chamber for receiving liquid and gas, and an outer string of pipe with a sealing site, located between the bottom columns of pipes, and a chamber for receiving liquid and gas in communication with the annular space above the node sealing bottom and provided with a submersible pump, the inlet of which communicates with nutrisurvey space, which is supplied with fluid, with submersible pump consists of an electric coil, rotary, or centrifugal, and chamber for receiving liquid and gas made in the form of camera low pressure jet pump, the inlet of which communicates with the outlet of the submersible pump, and the output from the inner column pipe in the annular space under pressure is used to supply gas with absorption in the low-pressure chamber. The disadvantages of this device are:

-first, high metal structure, due to the large number of components and parts (two concentric columns of pipes, submersible pump);

-secondly, unregulated aeration of liquids and, that is, the impossibility of changing the value of the carbonated liquid during its injection into the reservoir;

-thirdly, the low quality of the dispersion of gas in liquid and low intensification of the mixing gas-liquid mixture as gas is simply absorbed in the low-pressure chamber under the action of fluid flow and thence falls into the reservoir;

-fourthly, it is not possible to cut off the flow of gas in the low-pressure chamber of the jet pump if necessary transition-injection with a gas-liquid mixture fluid.

An object of the invention is to reduce the metal structure of the device and improving the quality of dispersion of gas in liquid and intensify the mixing gas-liquid mixture with the ability to regulate the magnitude of the carbonated liquid is injected into the reservoir and sealed the cut-off channel of the gas flow in the low-pressure chamber of the jet pump.

The problem is solved by a device for pumping a gas-liquid mixture into the reservoir containing placed in the borehole inner string of pipe, equipped with a chamber for receiving liquid and gas, and an outer string of pipe, sealing the node, and a chamber for receiving liquid and gas in communication with the annular space above the sealing of the node and executed in the camera view low pressure jet pump, inlet is vtorogo installed ejector, and the output is in communication with the interior of the column pipe in the annular space under pressure is used to supply gas with absorption in the low-pressure chamber of the jet pump.

What's new is that the sealing unit is designed in the form of a manifold and installed in a borehole comprising an inner pipe string above the reservoir, and above the packer front camera low pressure jet pump in the inner string of pipe is made through the radial grooves for gas supply, and the outer column tube bottom is equipped with ejector, telescopically mounted in the inner string of pipe at the inlet chamber to the low pressure jet pump with the possibility of axial movement relative to the inner pipe string and regulation of the bore through the radial grooves with tight cut-off, at the entrance of the jet pump is in communication with the outer casing pipe and below the outlet jet pump inner column pipe provided with a diaphragm with a Central slotted holes, with each slot further diaphragm is displaced at an angle of 15-20° clockwise or counterclockwise below the apertures in the inner colon tube is mounted a tubular damper flow gas-liquid mixture.

In the process of refining oil are highlighted in light form Plevo the cities - associated gas. To transport or process associated gas, in most cases, unprofitable or impossible. To dispose of associated gas, it is necessary to burn it, worsening the already difficult environmental conditions on the fields. However, there is a way to use associated gas for enhanced oil recovery fields by injection into the reservoirs of gas-liquid mixtures.

The effect of gas-liquid mixtures during their injection into the reservoir is expressed in the following:

- is the dissolution of associated gas in oil, thereby reducing its viscosity and, therefore, simplifies the promotion of the surface.

- is the dissolution and removal from the pore spaces of the oil bearing rock heavy hydrocarbons, while improving the effective permeability;

- prevents prominy in oil reservoirs and, as a consequence, premature flooding of the field.

As experience has shown, the use of associated gas in gas-liquid mixtures can produce oil from the oilfields in the late and final stages of development, that is, makes better use of the potential of the Deposit and to withdraw from gas flaring, significantly increasing the profitability of oil fields.

Figure 1 schematically comprises the acts of the device for injection of gas-liquid mixture into the formation.

In the figure 2, 3 and 4 depict, respectively, the cross-section A-a, B-B and C-In device for pumping gas-liquid mixture into the formation.

Device for gas-liquid mixture injection into the reservoir contains placed in the borehole 1 (see figure 1) inner string of pipe 2, is equipped with a chamber for receiving liquid and gas 3, and an outer string of pipe 4, sealing the node 5. For example, the inner and outer column pipes made of 89 mm tubing tubes.

Chamber for receiving liquid and gas 3 is in communication with the annular space 6 above the sealing of node 5 and is designed as a chamber of low pressure 3 jet pump 7. On the camera input low pressure 3 jet pump 7 is installed ejector 8, and the output is in communication with the interior of the column tube 2.

In the annular space 6 under pressure is used to supply gas with absorption in the low-pressure chamber 3 jet pump 6. The gas flow is, for example, using the plunger of the compressor (figure 1, 2, 3, 4 not shown) brand SHIN 46.03 (the manufacturer plant and gas engineering "synergy", Russia, Perm region, Perm).

Sealing the node 5 (see figure 1) is designed as a packer, for example, the brand of PRO-YAMO, manufactured by the scientific-production firm "Packer" (Russian Federation, Republic of Bashkortostan, gontarski), and set the Yong in the well within the interior of the column tube 2 above the reservoir 9.

Above the packer 5 front camera low pressure 3 jet pump 6 in the inner string of pipe 2 is made through the radial grooves 10 for gas.

The outer pillar pipe 4 from the bottom is equipped with ejector 8, telescopically mounted in the inner string of pipe 2 inlet chamber low pressure 3 jet pump 7 with the possibility of axial movement relative to the inner column tube 2 and the control bore through the radial grooves 10 of length L with tight trim. The outer pillar tubes 4 are telescopically mounted to an inner string of pipe 2, which excludes the use of concentric spaced columns of tubes in comparison with the prototype, which reduces the metal structure.

For example, in the upper part of the inner column tube 2 is made through two radial groove 10 of length L=500 mm and a width of 10 mm, with the possibility to adjust the flow area through the radial grooves 10 of length L=500 when moving the outer column tube 4 relative to the inner pipe string 2. For example, in the working position of the end-to-end length of each radial groove 10 is 1=300 mm×10 mm Also through radial grooves 10 have the opportunity sealed overlap the outer surface of the ejector 8.

The output of the jet pump 7 is in communication with the interior of the column tube 2, and the input stroing the pump 7 is in communication with the outer casing pipe 4.

Below the outlet of the jet pump 7 of the inner column pipe 2 is provided with apertures 11';...11ⁿwith the corresponding Central slotted holes 12';...12ⁿ. Each slot 12'; 12"...12ⁿ(see figure 1, 2 and 3) subsequent diaphragm 11'; 11";...11ⁿoffset angle α=15° to 20 ° clockwise or counterclockwise.

For example, as shown in figure 1, inside the interior of the column tube 2 below the outlet of the jet pump 7 is made of five apertures, each of which is provided with a slot opening size of 45 mm×30 mm and are offset from each other by the angle α=18° (see figure 2 and 3) in a clockwise direction.

Below the diaphragm 11'; 11";...11ⁿ(see figure 1) in the inner string of pipe 2 is mounted a tubular stator flux 13 gas-liquid mixture, for example, made in the form of a package of horizontal pipes with a diameter of 15 mm and a length of 2 m, the Device operates as follows.

In the annular space 6 (see figure 1) wells 1 open annular valve 14 by the compressor, for example, the brand SHIN 46.03 under low pressure, for example 0, 2 MPa (figure 1, 2, 3, 4 are not shown)produce a flow of gas.

In an outer string of pipe 4 from the system reservoir pressure maintenance, for example, from the pumping station, with an open center valve 15 under pressure, for example, 9,0 MPa serves fluid, e.g. the R, fresh water density of 1000 kg/m Fluid under pressure through the outer string of pipe 4 through the ejector 8, mounted on its lower end enters the low-pressure chamber 3 jet pump 7. As a result, the low-pressure chamber 3, an underpressure is created due to the high velocity of fluid flow in the ejector 8, and since the low-pressure chamber 3 through radial grooves 10 is in communication with the annular space 6, where the low pressure gas, because of the reduced pressure in the low-pressure chamber 3 jet pump 7 to the annular space 6 through the radial grooves 10 is sucked gas.

Gas is drawn from the annular space 6 in the low-pressure chamber 3 jet pump 7 and its subsequent mixing with the liquid in the jet pump 7, at the output of the jet pump 7 is formed stream gas-liquid mixture, which on the inner string of pipe 2 moves down and gets on the diaphragm 11'; 11";...11ⁿ.

Further gas-liquid flow passes through the slotted holes 12; 12';12...ⁿthe respective apertures 11'; 11";...11ⁿin the inner string of pipe 2, and the gas dispersed in the liquid and intensively mixed due to a sharp contraction in the diaphragm 11'; 11";...11ⁿand a sharp expansion in the diaphragm 11'; 11";...11ⁿ. Bliod the OC to each slot 12; 12';12...ⁿsubsequent diaphragm 11'; 11";...11ⁿoffset angle α (see figure 2 and 3) clockwise excluded "dead zones" for diaphragms 11'; 11";...11ⁿ.

This leads to a better dispersion of gas in liquid and intensify the mixing gas-liquid mixture in comparison with the prototype.

Due to the strong turbulence in the flow in the inner pipe string 2 (see figure 1) for diaphragms 11'; 11";...11ⁿformed emulsion structure of the gas-liquid mixture, which on the inner string of pipe 2 with the rotation by inertia enters the tubular damper stream 13, is made in the form of a package of horizontal pipes, in which the damping of rotational motion of emulsion structure of the gas-liquid mixture. Next, the gas-liquid mixture in the form of an emulsion due to the packer 5 intervals of the perforations 16 falls into the reservoir 9, where the dissolution of associated gas in oil, resulting in reduced oil viscosity and simplified its promotion in the reservoir. In practice, the gas-liquid mixture injection into the reservoir 9, depending on its physical-chemical characteristics of the necessity of change magnitude (degrees) carbonated liquid, so the value of the carbonated liquid is produced by changing the volume of the chamber to the low pressure 3 input and what vodom in her ejector 8, made in the form of a nipple on the value of 1, equal, for example, 300 mm, but not more length L equal to, for example, 500 mm

The change in the degree of gassing produce tripping, lifting the outer pipe string 4 ejector 8 on the end from the wellhead 1 relative to the inner column tube 2 and the chamber of low pressure 3, respectively, to a length not more than a value L with the simultaneous flow of gas and liquid, respectively. When lifting the outer pipe string 4, the lower end of the ejector 8 increases the flow area through the radial grooves 10, thereby increasing the chamber volume low pressure 3, which allows more intensively to suck the gas from the annular space 6 well 1 in the low-pressure chamber 3. This increases the degree of carbonated fluid injected into the reservoir 9. During the descent of the outer pipe string 4, the lower end of the ejector 8 reduces the flow area through the radial grooves 10, thereby reducing the chamber volume low pressure 3, which allows less intensively to suck the gas from the annular space 6 well 1 in the low-pressure chamber 3. This reduces the degree of carbonated fluid injected into the reservoir 9. Control the degree of carbonated liquid in the ejector 8 is from the wellhead flow of liquid and gas using any of the known flowmeter (figure 1, 2, 3, 4 are not shown).

Device for gas-liquid mixture injection into the reservoir reduces the metal structure of the device and improve the quality of dispersion of gas in liquid, to intensify the mixing gas-liquid mixture with the ability to regulate the quantity of carbonated liquid injected into the formation.

Device for gas-liquid mixture injection into the reservoir containing placed in the borehole inner string of pipe, equipped with a chamber for receiving liquid and gas, and an outer string of pipe, sealing the node, and a chamber for receiving liquid and gas in communication with the annular space above the sealing of the node and executed in the camera view low pressure jet pump, input is set to the ejector, and the output is in communication with the interior of the column pipe in the annular space under pressure is used to supply gas with sasian the I in the low-pressure chamber of the jet pump, characterized in that the sealing unit is designed in the form of a manifold and installed in a borehole comprising an inner pipe string above the reservoir, and above the packer front camera low pressure jet pump in the inner string of pipe is made through the radial grooves for gas supply, and the outer column tube bottom is equipped with ejector, telescopically mounted in the inner string of pipe at the inlet chamber to the low pressure jet pump with the possibility of axial movement relative to the inner pipe string and regulation of the bore through the radial grooves with tight cut-off, at the entrance of the jet pump is in communication with the outer casing pipe and below the outlet of the jet the internal pump column pipe provided with a diaphragm with a Central slotted holes, with each slot further diaphragm is displaced at an angle of 15-20° clockwise or counterclockwise below the apertures in the inner colon tube is mounted a tubular damper flow gas-liquid mixture.