Development method of deposit with forced product withdrawal, and device for its implementation

FIELD: oil and gas industry.

SUBSTANCE: method involves extraction of product from formation with water-oil mixture in forced mode, separation of product into oil and water and pumping of separated water to water receiving formation. According to the invention, drilling of lower water receiving formation is performed; device in the form of lower pump and upper pump is lowered into the well; inlet system of the above device is made in the form of a pipe between casing pipe and pipe string, which provides total flow velocity at water and oil extraction, which is less than floating-up velocity of oil in water for separation of product in well into water and oil. Separated water is pumped with lower pump to water receiving formation; at that, pumps are chosen with the capacity corresponding to formation product water content and total capacity providing the forced product extraction from the formation with water-oil mixture. Device includes pumps with drives, which have the possibility of being located in series on pipe string in the well and have inlet and outlet devices, and packer having the possibility of being located between formations in the well, the upper one of which has water-oil mixture, and lower one is intended to receive water. Inlet device of upper pump is made in the form of cylindrical capacity with side inlet hole interconnected with formation containing water-oil mixture, and outlet device of this pump is made in the form of valve unit passing the oil to pipe string. Outlet device of lower pump is made in the form of channel with water delivery valve to the formation intended to receive water, and inlet device is made in the form of channel with suction valve for pumping of settled water to the pump. At that, annular section area outside the capacity is chosen so that maximum flow velocity of water-oil mixture downstream of this section exceeds floating-up velocity of oil in water. At that, capacity is made in the form of a pipe located between casing pipe and pipe string with inner annular section area providing the total flow velocity at water extraction with lower pump and oil extraction with upper pump, which is lower than floating-up velocity of oil in water at intense extraction in the capacity. Side hole of the capacity is located at least 1 m below bottom of formation containing water-oil mixture and inlet of upper pump. At that, inlet device of lower pump is interconnected with the capacity at least 1 m below side hole. Capacity is closed from below with a plug with a connection pipe interconnected with outlet device of lower pump and with borehole space.

EFFECT: increasing oil recovery owing to increasing reservoir coverage coefficient at water flooding at advanced stage of development, and reducing material costs.

3 cl, 1 dwg

 

The invention relates to the oil industry, in particular to methods of oil field development using forced fluid extraction from wells. It focuses on the increase in oil producing formations by reducing the water content of products, limit water abstraction increases the pressure gradient in the near-wellbore area of the formation.

The known method of hydrocarbon deposits development (patent RU №2378502, IPC EV 43/20, publ. 10.01.2010), which provides for the drilling of injection and production wells, injection of the displacing agent and forced the selection of produced products through wells with the filter below the current position of the oil-water contact, the extraction of oil from pristroennogo interval of the reservoir oil wells located on the elevated areas of the structure.

The disadvantages of the method are that it can be used only at the location of the wells on the elevated areas that are not possible to achieve significant enhancement of oil recovery, as well as increased material costs due to rising all of products produced on the surface, followed by its separation and re-injection of produced water in order to maintain reservoir pressure.

The known method development of oil, which provides downhole separation narrowly missed the emnd products (patent RU №2275502, IPC EV 43/38, EV 43/22, EV 37/00, publ. 27.04.2006). It allows the separation of free flowing products in the oil well in combination with chemical injection.

Major drawbacks of this method are the additional material cost of reagents, the cost of transportation, injection, and costs associated with environmental protection in its application, as well as the inability to use this method and system in the case of the forced fluid extraction.

The closest analogue of the invention to the technical essence is the way of the development of oil deposits (patent RU №2105870, IPC EV 43/20, 43/30, publ. 27.02.1998), including the injection of working agent through the injection wells, oil extraction through production wells and forced fluid withdrawal on the part of the producing wells, in the areas of development spend alternating selection of oil through the production wells and the injection of working agent through the injection wells, which are involved in the work of wells adjacent plots in antiphase, reduce the size of areas of development by placing the cutting rows of injection wells, while carried out at forced mode stepwise increase production of the well.

Significant disadvantages of this method are the input of additional series injection well is, the rise of oil-water mixture from the wells to the surface and further injection of separated water in injection wells, which entails additional material costs.

The technical objectives of the proposed method are improving oil recovery by increasing the reservoir sweep displacement (the ratio of the volume of the reservoir covered by the exclusion, to the total volume of the reservoir) in the exercise of flooding on the hydrocarbon at the late stage of development, reduction of material costs associated with the rise of all of products produced on the surface and subsequent injection obtained by separation of water into injection wells.

This object is achieved by way of field development at the late stage development with forced selection of products, including the extraction of products from the reservoir with oil-water mixture in forced mode, the production separation into oil and water and the injection of separated water in the reservoir for receiving water.

What's new is that in the well produce the dissection of the underlying reservoir for receiving water, down into the well device in the form of the bottom of the pump and the top of the pump, the input device which are in the form of a pipe between the casing and the column pipe, providing total / min net is ü currents in the selection of water and oil, lower speed ascent of oil in water to separate the products in a well for oil and water, with segregated water pump lower pump into the reservoir for receiving water, and the pumps pick up performance corresponding to the water cut of the reservoir, and the total performance, providing big selection of products of the reservoir oil-water mixture.

To implement the method development requires the use of a new device.

A device for implementing this method of design (patent RU №2364711, IPC EV 43/14, 43/38, publ. 20.08.2009), which contains the packer, is installed between the upper and lower layers, the upper and lower multidirectional screw pumps, lowered on a tubing string into the well and installed above the packer, pumps, placed on the surface, the entrance of the lower pump is placed below the dynamic level emitted under the action of gravity water from oil-water mixtures upper reservoir, and the outlet is in communication with podplacenym space, and the entrance of the upper pump is placed above the dynamic level of released water, and the outlet is in communication with the lift column for lifting water-cut oil to the surface of the well.

The disadvantages of this device are the lack of cameras sludge, the ability to work at low flow rates and flow velocities, SLE is a result which is impossible to use this device when forced mode selection liquid.

The closest analogue device is a downhole pumping unit for oil production and water injection (patent RU №2339794, IPC EV 43/14, publ. 27.11.2008)containing pumps and their sequential location in the borehole and having input / output devices, wellhead pumps, connected by rods with them, and packer, with the possibility of placement between layers in the borehole, one with a water-oil mixture, and the other, the bottom for the reception of water, and the input device is located below the top of the pump, and the output device, the bottom of the pump is made in the form of a channel passing through the packer, for injection of water into the lower reservoir.

The disadvantages of this device are: poor separation, high resistance to fluid flow and the impossibility of separating oil from water by forced selection, as in the vessel applied design "pipe in pipe" multi-way, which makes the cross-sectional area is small compared to the length of the vessel, which leads to high flow velocity in the vessel with a large number of changes of direction of fluid flow, leading to selection and collection it in the upper part of the vessel and the absence of zones of sludge on the forced selection of oil-water mixture; the complexity and intensity of manufacturing this structure, leading to complement inim expenses. The disadvantage is the collection of separated solid particles from the oil-water mixture inside the tank of the device, which leads to their accumulation in the lower part and the need for periodic lifting device and cleaning capacity from these particles.

The technical task of the invention is to provide a simple and cheap in manufacture and use of devices made with the possibility of removal of solid particles from the tank to the bottom of a well, the separation of oil-water mixture reservoir for oil and water when forced mode selection, lifting the separated oil to the surface and water injection into the receiving layer.

This technical problem is solved by a device containing pumps with drives made with the possibility of their sequential position on the string of pipe in a well and having input / output devices, and packer, with the possibility of placement between layers in the borehole, the top with oil-water mixture, and the bottom is designed to receive water, and the input unit of the upper pump is made in the form of a cylindrical tank with an inlet side opening communicated with the reservoir oil-water mixture, and the output of this pump is made in the form of a valve block, leaking oil into the string of pipe, and the output device, the bottom of the pump is made in the form of a channel with nagn the test valve to discharge water into the reservoir, intended for receiving water, and the input device is in the form of a channel with suction valve for an injection pump of distilled water, the area of annular cross-section outside of the vessel is selected so that the maximum rate of flow of oil-water mixture down in this section exceeds the rate of ascent of oil in the water.

What is new is that the tank is made in the form of a pipe located between the casing and casing pipes with square inner annular cross-section, providing a total flow rate when selecting lower water pump and oil upper, lower speed ascent of oil in water under intensive selection in the vessel, and a side opening containers located below the soles of the reservoir oil-water mixture and sign the top of the pump at least 1 m, and the input device, the bottom of the pump is communicated with the tank below the side openings are not less than 1 m, with capacity below the stilling tube with a nozzle communicated with the output the device of the lower pump and downhole space.

New is also that the side hole of the tank is below the dynamic level of the oil-water contact.

The drawing shows a diagram of the device for implementing the proposed method of development.

The device comprises a top 1 and bottom 2 pumps with drives (for example: with the ANOC-rocking for sucker-rod pumps (SRP system) or the electric motor, the descent from the pump, when using electrophrenic (centrifugal) pumps (ESP) - on features. shown conventionally), made with the possibility of serial position on the string of pipe 3 in the borehole 4 and respectively having input 5 or 6 devices and output 7 or 8 devices. Packer 9 is installed in the bore 4 between the layers 10 and 11 to exclude hydraulic connection between them. The bottom layer 11 is designed to receive water, and the top 10 for production of oil-water mixture. The input device 5 of the upper pump 1 is made in the form of a cylindrical tank 12 to the input side hole 13 (or holes 13 is not shown, a total area no smaller circular cross-section outside of the vessel 12 to reduce the hydraulic resistance and the rate of flow of oil-water mixture), communicated with the reservoir 10 with the oil-water mixture, and the output device 7 of the pump 1 is made in the form of a valve block, leaking oil into the string of pipe 4. The output device 6 of the lower pump 2 is made in the form of a channel with injection valve (to hell. not shown)located at the outlet of the pump 2, to discharge water into the lower reservoir 11 designed to receive water. The input device 6 of the pump 2 is made in the form of a channel with suction valve (to hell. not shown) for injection pump 2 of distilled water, when this square is the area of the circular cross-section outside of the vessel 12 is selected so the maximum rate of flow of oil-water mixture down in this section exceeds the rate of ascent of oil in water, which prevents the separation of the products of the reservoir 10 into oil and water before entering it into the container 12. The container 12 is made in the form of a pipe located between the casing bore 4 and the column pipe 3 with the area of the inner annular cross-section, providing a total flow rate when selecting lower water pump 2 oil and the upper 1, lower speed ascent of oil in water under intensive selection of pumps 1 and 2 from the tank 12, which allows the selection of oil and water separately, respectively pumps 1 and 2 after their separation in the well 4. Side opening 13 of the vessel 12 is located below the bottom of the reservoir 10 and the input 14 of the upper pump 1 at least 1 m (this distance is derived empirically to avoid capture production of the reservoir 10 without separation). The input device 6 of the lower pump 2 communicates with the tank 12 below the lateral openings 13 is not less than 1 m (this distance is derived empirically to avoid capture production of the reservoir 10 without separation). The tank 12 below the stilling tube 15 and a pipe 16 provided with an output device 8 to the bottom of the pump 2 and downhole podplacenym space of the borehole 4. While separated solid particles from the oil-water mixture by the pump 2 vykachivaiut is from the bottom of the tank 12 and is deposited on the bottom of the borehole 4, eliminating the collection of them in the tank 12 and, as a consequence, it does not require periodic rise to the surface and cleaning. Side opening 13 of the vessel 12 may be located at sufficient distance from the packer 9 below the dynamic level of the oil-water contact (OWC) 17. This position of the side channel 13 (injection products of the reservoir 10 in the released water) eliminates formation of inseparable emulsion and improve the separation of oil and water, which is typical when lifting the pop-up oil through the transition layer (certhe shown)located in the interval of the dynamic level 17 KSS.

A specific example. The analysis of state formation with the oil-water mixture 10 and the reservoir for receiving water 11: stratum 10 deposits with the following characteristics: porosity - 18,4%, average permeability - 0,315 μm2the saturation - 77,4%, absolute mark of occurrence of layer - 1500-1515 m, the average saturated thickness of 6 m, the initial reservoir pressure and 17.9 MPa, reservoir temperature and 35°C, the density of formation oil - 820 kg/m3viscosity and 4.68 MPa·s, the saturation pressure - 7.9 MPa, gas content - 55,45 m3/so the Reservoir is at a late stage of development, the cut of the prevailing majority of wells is 95%; the reservoir 11 for the reception of water with the following characteristics: porosity of 17.5%, cf is dnaa permeability - 0,229, the initial reservoir pressure and 17.9 MPa, reservoir temperature is 35°C. the Average flow rate of the liquid when the forced selection is 400 m3/day. Based on the analysis of the performance of the reservoir 10 and the water content of its products matched the performance of the top 1 and bottom 2 of the pumps and their correlation: performance of the top 1 pump 20 m3/day, the lower 2 - 380 m3/day, which is selected from a water-cut oil-water mixture (95% water and 5% oil). When forced mode selection down the device for realization of the proposed method in the hole 4. Put into action the top 1 and bottom 2 pumps in forced mode, reducing the level of the liquid 18 in the tank 12 below half of the hydrostatic level, which is measured from the roof of the reservoir 10. Then the pumps 1 and 2 is switched to the normal mode to maintain a level 18 in the selected interval and maintaining the forced selection in the hole 4 from the reservoir 10. In the tank 12 through the opening 13 enters the oil-water mixture from the reservoir 10. In the tank 12 flows of immiscible fluid through the opening 13. After which separated in the vessel 12 oil through the input device 5 and the output 7 of the pump 1 rises to the surface. The separated water pump 2 through the inlet 6 and outlet 8 of the pump device 2 through the pipe 16 and podvecerni space wells is 4 is injected into the lower reservoir 11. Thus, the wells water cut decreased from 95%to 60%. Injection of produced water into the reservoir 11 with the aim of TTD allowed to increase the selection of reacting producing wells reservoir 11 by 3%.

The proposed method and the device allow to increase the recovery factor by increasing the reservoir sweep displacement (the ratio of the volume of the reservoir covered by the exclusion, to the total volume of the reservoir) in the exercise of flooding on the hydrocarbon at the late stage of development, through the use of forced selection of oil producing wells, and to reduce material costs due to the separation of oil-water mixture and rise to the surface only spin-off of oil and injection obtained by separation of the water in the receiving layer of the same well without separated solid particles from the oil-water mixture.

1. The method of field development at the late stage of development, with forced selection of products, including the extraction of products from the reservoir with oil-water mixture in forced mode, the production separation into oil and water and the injection of separated water in the reservoir for receiving water, characterized in that the well produces the opening of the underlying reservoir for receiving water, down into the well device in the form of lower on the wasp and the top of the pump, the input device which are in the form of a pipe between the casing and the column pipe, providing a total flow rate in the selection of water and oil, less speed ascent of oil in water to separate the products in a well for oil and water, with segregated water pump lower pump into the reservoir for receiving water, and the pumps pick up performance corresponding to the water cut of the reservoir, and the total performance, providing big selection of products of the reservoir oil-water mixture.

2. The device for implementing the method that contains pumps with drives made with the possibility of their sequential position on the string of pipe in a well and having input / output devices, and packer, with the possibility of placement between layers in the borehole, the top with oil-water mixture, and the bottom is designed to receive water, and the input unit of the upper pump is made in the form of a cylindrical tank with an inlet side opening communicated with the reservoir oil-water mixture, and the output of this pump is made in the form of a valve block, leaking oil into the string of pipe, and the output device, the bottom of the pump is made in the channel injection valve for injection of water into the reservoir, used for receiving the odes, and the input device in the form of a channel with suction valve for an injection pump of distilled water, the area of annular cross-section outside of the vessel is selected so that the maximum rate of flow of oil-water mixture down in this section exceeds the rate of ascent of oil in water, characterized in that capacity made in the form of a pipe located between the casing and casing pipes with square inner annular cross-section, providing a total flow rate when selecting lower water pump and oil upper, lower speed ascent of oil in water under intensive selection in the vessel, and a side opening containers located below the soles of the reservoir with oil-water mixture and sign the top of the pump at least 1 m, and the input device, the bottom of the pump is communicated with the tank below the side openings are not less than 1 m, with capacity below the stilling tube with a nozzle communicated with the output device of the lower pump and downhole space.

3. The device according to claim 2, characterized in that the side hole is located below the dynamic level of the oil-water contact.



 

Same patents:

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FIELD: oil and gas industry.

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EFFECT: higher efficiency.

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FIELD: oil and gas production.

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1 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes serial pumping into well of buffer, blocking and pressing liquid, blocking liquid contains hydrocarbon base, acyclic acid, caustic soda and mineral filler with following relation of components in percents of mass: hydrocarbon base 41-72, acyclic acid 6.1-14.4, caustic soda 4.9-13.0, mineral filler the rest. Hydrocarbon base of blocking liquid is oil or oil processing products. As mineral filler blocking liquid has calcium carbonate with diameter of particles no less than 2 micrometers.

EFFECT: higher efficiency, simplified maintenance, simplified construction.

3 cl, 1 ex

FIELD: oil industry.

SUBSTANCE: at least one acoustic dynamic is mounted immediately on product pipe in oil well and acoustic characteristic of flowing environment flow is determined in product pipe. It is sent into surface controller, using product pipe. Using surface controller flowing substance flowing mode is determined, on basis of which working parameters of oil well are adjusted. Working parameters of oil well can be adjusted to detect Taylor mode of flow. For adjustment of working parameters throttle is used and/or controlled valve of oil well, controlling amount of gas, forces into product pipe. For determining mode of flow of flowing environment artificial neuron net can be used. It is possible is provide energy for acoustic sensor through product pipe. It is possible to determine additional physical characteristics of flowing substance, for example pressure and temperature.

EFFECT: higher efficiency.

3 cl, 22 dwg

FIELD: mining industry.

SUBSTANCE: system has first induction throttle, second induction throttle and controlled switch. Second induction throttle is positioned near second branch of pipeline structure. Controlled switch has two outputs. First switch output is electrically connected to pipeline structure on the side of induction throttles connection, where first and second branches of pipeline structure intersect. Second output of switch is electrically connected to pipeline structure on other side of at least one induction throttle. Pipeline structure can be positioned inside oil well, and can have casing string and operation tubing column. Also described is method for extracting oil products from oil well using said system.

EFFECT: higher efficiency.

4 cl, 10 dwg

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