Device to force fluid into injection well

FIELD: oil-and-gas industry.

SUBSTANCE: this device comprises hollow case with cover that has working fluid feed channels and bottom with discharge channel that features cross-section larger than that of working fluid feed channel for communication case inside with well bottom zone, moving working member that makes with said case the working chambers. Said working member is shaped to truncated ellipse fitted on the case at antifriction bearing and composed of axle with relationship between arms of top and bottom ends equal to 1:2. Aforesaid working member has the channel to communicate working chamber, antifriction bearing with the case bottom discharge channel. Nozzle is arranged under said bottom with communicating discharge channel and radial equal-cross-section area. Total cross-section area of said holes equals that of discharge channel. Cover bottom surface and bottom upper surface are composed of cylinder generatrix to allow displacement of working member top and bottom arms there over and isolation of working chambers.

EFFECT: higher efficiency of stationary pulse injection of fluid.

2 dwg

 

The invention relates to oil industry and can be used in the system of reservoir pressure maintenance by pulsed injection of fluids into oil-bearing formations.

The closest in technical essence to the present invention is a device for impact on bottom-hole zone of the well, comprising a hollow body with cover, bottom and outlet channels for communication of the body cavity with a bottom-hole zone of the well bore, the movable working body, which forms with the housing of the working chambers, and channels for supplying the working agent (see AV. St-in the USSR №1538589, EV 43/00, 19.10.1987 G.).

However, a disadvantage of the known device is that it provides long-term effectiveness in a stationary fluid injection into the formation in the system of reservoir pressure maintenance due to the poor reliability and a small amplitude of pressure fluctuations of the output pulses of fluid.

An object of the invention is to increase long-term efficacy is stationary pulsed injection of fluid by increasing the reliability and amplitude of pressure fluctuations.

This object is achieved in that the device for pumping fluid to the injection well, comprising a hollow body with a lid, in which the channels for supplying the working agent, and the bottom with the exhaust channel located�osennim concentrically therein and having a cross-sectional area, a large cross-sectional area of the flow channel of the working agent to the messages the body cavity with bottom-hole zone of the well bore, the movable working body, which forms with the housing of the working chamber, according to the proposed technical solution the movable working body is made in the form of a truncated ellipse that is installed in the housing on a support slide and made in the form of the axis ratio of the lengths of the shoulders upper and lower ends 1:2, in the working body is formed with a channel with the ability to inform the working chamber, a sliding bearing with the exhaust channel of the bottom of the housing, located under the bottom nozzle communicating with the exhaust channel and the radial holes of the same cross-sectional area, the total cross-sectional area of holes of equal cross-sectional area of the outlet, the bottom surface of the cover and the upper surface of the bottom made in the form of the generatrix of the cylinder with the possibility of movement of the upper and lower shoulders of the working body and the insulation of the working chambers.

Comparative analysis with the prototype shows that the device for pumping fluid to the injection well movable working body is made in the form of a truncated ellipse that is installed in the housing on a support slide and made in the form of the axis ratio of the lengths of the shoulders upper and lower ends 1:2, and in your body you�olden channel with the ability to inform the working chamber, sliding bearing with the exhaust channel of the bottom of the housing, located under the bottom nozzle communicating with the exhaust channel and the radial holes of the same cross-sectional area, and the total cross sectional area of the holes is equal to the cross sectional area of the outlet channel, the bottom surface of the cover and the upper surface of the bottom made in the form of the generatrix of the cylinder with the possibility of movement of the upper and lower shoulders of the working body and the insulation of the working chambers.

The above distinguishing features sufficient for the compliance of the claimed device, the criterion of "novelty."

A comparison of the claimed solutions with other technical solutions shows that the device is working body in the form of a stabilizer on the axis of rotation with different lengths of the shoulders, cap with channels for supplying the working agent and an additional outlet channel is known.

However, when administered in combination in the inventive solution allows to obtain new properties different from the properties of each distinctive feature is the increase in reliability due to the complete exclusion of grazing the lower edge of the movable working body, made in the form of a truncated ellipse streamlined outer surface with two sides, and the extreme periphery of its provisions on the internal cavity of the housing and the increase in the amplitude of vibrations�Oia pressure of the injected fluid through the full rotation of blocking the channels of flow of the working agent and transfer one of the outlet channels from the bottom to the movable working body. The use of the above properties, which shows a device for pumping fluid to the injection well, lead to the achievement of this goal, namely to improve long-term efficacy is stationary pulsed fluid injection. This allows to make a conclusion about conformity of the proposed technical solution the criterion of "substantial differences".

The results of theoretical and laboratory studies of the proposed device for fluid injection into an injection well revealed the following. When the device in the laboratory taking into account all the factors that occur when liquid injection (throttle response averaged 100...200 m3/day at a pressure of injection of 12.0...15.0 MPa), pulse frequency of the injected fluid at the outlet when the flow rate of 1.15...3,21 l/s was 22.0...93,0 Hz. The frequency range of the oscillations is optimal for the distance of propagation of oscillations (from the point of view of the phase velocity of waves propagation and absorption coefficient - conclusions based on theoretical and laboratory studies) in the array of rocks based on their own frequencies (shales, limestones and sandstones). In this case, coverage impulsive inhomogeneities of the hydrocarbon field has a significant border. When Prov�completion of bench testing with flow rate of injected liquid 1,0...2,0 l/s and injection pressure of 4.5...5.0 MPa, the amplitude of the pressure fluctuations at the outlet of the device was 0.15...is 4.85 MPa. This large variation of the amplitude of the pressure fluctuations (the prototype relative to the above test conditions is slightly smaller) has a positive effect on reducing the residual oil saturation (speeds up the process of capillary impregnation of closed pores - substitution of formation fluid pumped water) and, as a consequence, the increase of oil recovery in producing wells. Experimental use of the proposed device was carried out at two injection wells in JSC "RN-Samaraneftegaz" for 1.5 years. When an external examination of extracted device was not detected breakdowns, and by visual inspection of the inner surface of the housing of the places of contact of the working body also was not the case. In addition, there was obtained the increase of oil recovery in reacting producing wells, which on average was maintained for 14...15 months. The above arguments are sufficient for the compliance of the claimed device for fluid injection into an injection well with the criterion of "industrial efficiency".

Fig.1 is a perspective view of an apparatus for fluid injection into an injection well in section; Fig.2 - a section a-A in Fig.1.

A device for pumping fluid to the injection well includes a hollow body 1 with a cover 2, a bottom 3 and outlet channels 4 and 5 for messages cavity of the housing 1 by spritebase area of the injection well, the movable working body 6, made in the form of a truncated ellipse, which forms with the housing 1 of the working chambers 7 and 8 and the channels for supplying the working agent 9 and 10. The working body 6 is mounted in the housing 1 on the support slide 11, which is made in the form of a shaft 12, mounted in the housing 1 by means of the nut 13 and washer 14. The discharge port 4 is formed in the bottom 3 concentrically and has a cross-sectional area, a greater cross-sectional area of the channel 9 or 10 working agent injection. The working body 6 has two arms: the lower B and upper B, and the ratio of their lengths, respectively, is 2:1, and the outlet channel 5 is provided in the working body 6 with the ability to communicate the cavity 8, the sliding bearing 11 with the exhaust channel 4. The presence of the exhaust channel 5 allows you to create a differential pressure on the working body from the side of the chamber 7. At the same pressure of the injected fluid in the chambers 7 and 8, is equal to the area of the surface of the working body 6, through the outlet channel 5 is the outflow of fluid in bottom-hole zone of the well, i.e. the pressure in the chamber 8 falls. Due to the greater pressure in the chamber 7 and the difference between the shoulders of the working body 6 (the lower more than the upper two times) and switches off the low-side of the working body 6 in the direction of the camera 8. Thus, there is the launch of the device itself. In the lower part of the device has a nozzle 15 with a radial from�Artemi 16 of the same cross-sectional area, moreover, the total cross sectional area of the holes 16 is equal to the cross sectional area of the outlet channel 4. The lower surface of the cover 2 is made in the form of the generatrix of the cylinder, which moves the upper end of the upper shoulder In the working body 6 and the lid 2 is fixed in the housing 1 sub 17. The upper surface of the bottom 3 made in the form of the generatrix of the cylinder, which moves the lower end of the lower shoulder B of the working body 6. Thus, the chambers 7 and 8 are isolated from each other.

The device operates as follows.

The device on the column tubing below the packer, mounted on the bottom of the injection well. Fluid from the wellhead through the pipe string and packer, sub 17 is supplied through the channels 9 and 10 of the cover 2, respectively, in the working chambers 7 and 8 of the housing 1. The pressure of the injected liquid in the chambers 7 and 8 are identical. Thanks to the outlet channel 5 connecting the chamber 8 with the exhaust channel 4 and the radial holes 16 at the location of the working body in an upright position (as shown in the drawing), the pressure drop of the fluid on the working body 6 by the camera 7 will be more. Because of a difference of the lengths of the shoulders of the working body 6 and under greater pressure drop lower shoulder B of the working body 6 is moved to the right in the side of the camera 8, and opens�I channel 4, momentum of the fluid with the maximum pressure amplitude flows through the channel 4 and the radial holes 16 on the bottom of the injection well. When the deviation of the working body 6 in the direction of the camera 8 is alternately closing the outlet channel 5 and channel the flow of the working agent 9 into the chamber 7 through the upper shoulder In the working body 6, in which the fluid pressure drops to the pressure of the liquid column in the annulus. In the chamber 8, the pressure of the injected fluid is increased, and due to the pressure difference in the chambers 7 and 8 and the lengths of the shoulders B and C of the working body 6 lower shoulder B of the working body 6 is moved in the direction of the chamber 7 and completely blocks the passage section of the channel 4. The next time the flow channel of the working agent 9 is opened, and the chamber 7 enters the injected fluid, and the pressure in the chambers 7 and 8 is starting to level off. The working body 6, having a certain moment of inertia, depending on the flow rate of the injected fluid, some time moves further in the direction of the camera 7, opening the flow area of the channel 4 and giving new momentum to the fluid with the maximum amplitude of the pressure on the bottom of the injection well. Upon reaching the bottom of the shoulder B of the working body 6 leftmost position overlaps the upper shoulder In the working body 6 of the flow channel 10 working agent into the chamber 8. The LM pressure�bones in the chamber 8 falls to the pressure of the liquid column in the annulus, and in the chamber 7, the pressure increases. Lower shoulder B of the working body 6 is moved in the direction of the camera 8, alternately closing the outlet channel 4 and channel the flow of the working agent 9. The injected liquid with a maximum amplitude of pressure acts alternately on the bottomhole zone injection wells from the chambers 7 and 8 through the outlet channel 4 and the radial holes 16 in the nozzle 15. Contacting sharp edges of the bottom of the shoulder B of the working body 6 with the walls of the housing 1 is completely eliminated due to the streamlined elliptical shape of the working body 6, since the lower shoulder does not have time to come into contact with the housing due to changes in pressures in the chambers 7 and 8 by simultaneous overlapping of channels of flow of the working agent 9 or 10 and the opening of the channel 4 and larger diameter channel 4 than the diameters of the channels of flow of the working agent 9 or 10. It is a means for braking the working body 6 when opening the flow area of the outlet 4. The outlet channel 5 provides an initial shift of the working body 6. Support slide 11 due to the location of the outlet channel 5 in the working body 6 creates a differential pressure of the injected fluid, which helps to cleanse the supports from mechanical impurities contained in the fluid, and is used for liquid lubrication oscillating working body 6.

Application� this device allows for continuous fluid injection pulses to the injection well, increasing long term efficiency of the stationary pulsed injection of fluid by increasing the reliability and amplitude of pressure fluctuations, namely the increase in the permeability of the reservoir, increasing the rate of reverse capillary impregnation of closed pores and oil recovery in producing wells.

A device for pumping fluid to the injection well, comprising a hollow body with a lid, in which the channels for supplying the working agent, and a bottom with an outlet channel disposed concentrically therein and having a cross-sectional area, a greater cross-sectional area of the flow channel of the working agent to the messages the body cavity with bottom-hole zone of the well bore, the movable working body, which forms with the housing of the working chamber, characterized in that the movable working body is made in the form of a truncated ellipse that is installed in the housing on a support slide and made in the form of the axis ratio of the lengths of the shoulders upper and lower ends 1:2, the working body is formed with a channel with the ability to inform the working chamber, a sliding bearing with the exhaust channel of the bottom of the housing, located under the bottom nozzle communicating with the exhaust channel and the radial holes of the same cross-sectional area, and the total cross sectional area of the holes is equal to the cross sectional area of the outlet channel,the bottom surface of the cover and the upper surface of the bottom made in the form of the generatrix of the cylinder with the possibility of movement of the upper and lower shoulders of the working body and the insulation of the working chambers.



 

Same patents:

FIELD: oil-and-gas industry.

SUBSTANCE: method comprises cyclic decrease and increase of pressure in a formation by pumping of water through injection wells and oil withdrawal through production wells. Into the formation through injection wells the mineralised water is pumped periodically in the volume of 0.1-5 of pore volume of the formation and fresh water in the volume of 0.1-5 of pore volume of the formation. The transition to fresh water pumping after mineralised water pumping is performed without gradual decrease in mineralisation. The structure and concentration of salts of the pumped mineralised water are remained at the level of the formation one. The cycle of pumping of waters with different mineralisation is repeated many times. Fresh water is pumped until the moment when decrease of intake capacity of the injection well exceeds the allowable production level - critical drop of reservoir pressure in target impact areas. The mineralised water is pumped until the moment when the injection well sets to initial or close to initial operating mode which depends from the flow rate of the injected liquid and well head pressure.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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Downhole pulsator // 2539087

FIELD: oil and gas industry.

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EFFECT: improved efficiency of hydropercussion simulation of the formation.

4 dwg

FIELD: oil-and-gas industry.

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EFFECT: profound effects on the well walls, higher permeability of the well (oil yield).

3 cl, 1 dwg, 1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to the oil-and-gas industry, in particular to devices intended for affecting the bottomhole formation zone by a depression pulse to up the well efficiency operated by sucker-rod downhole-pumping plants. The proposed device pulse-depression action on bottomhole formation zone comprises a hollow case with a guide and intake holes and a depression chamber extending therein. A cover is telescopically arranged at the said hollow case and locked by a shear screw. Note here that a variable-section rod is fitted concentrically in the said hollow case to connect the said depression chamber with an extra depression chamber. The said variable-section rod interacts with an overflow hole of the hollow case while a packer and wedge are arranged on the cover cylindrical surface. The wedge outer conical surface interacts with radially displacing slips. The cover is provided with a stop to interact with the wedge. The said hollow case rests of the well bottom. The cover cylindrical surface is provided with a radially displacing thrust ring and extra slips arranged under the slips and an extra wedge rigidly connected to the hollow case guide. The variable section rod bottom section has lateral holes and is provided with a plug at its bottom end section. The variable section hollow rod houses a plunger with a suction valve. The said plunger is connected via the rod string with the pumping unit. In an initial position, the hollow case overflow hole interacts with the hollow rod and isolates the hollow case intake holes from the hollow rod side holes. In the working position, the hollow case overflow hole gets out from the interaction with the hollow rod and communicates the hollow case intake holes with the variable section hollow rod side holes.

EFFECT: efficient cleaning of the bottomhole formation zone without multiple round trips.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil industry, and namely to pulse hydraulic hammer treatment of the bottomhole formation area, and well development. Essence of inventions: method includes stratum shutoff by a ring packer, pressure treatment of the bottomhole formation area by cyclic pulses of repression and depression pressure to the bottomhole formation area with pumping out of formation fluid. In order to create repression and depression pressure pulses the below-packer space is separated from the over-packer space. The time is provided for alignment of below-packer pressure with over-packer pressure. Pressure in the over-packer area without injection of working fluid from the surface is made higher for the purpose of direct hydroram or lower than the formation pressure for the purpose of return hydroram. The below-packer space is united with tubing string or below-packer space is united with over-packer space for the purpose of direct or return hydroram. Potential separation or interconnection of the below-packer space with over-packer space or with tubing string is ensured by use of a downhole assembly with a shell, a saddle installed on it and a ring packer, a piston with cross tee, which is moved in the shell by means of the tubing string and potential piston inlet/outlet from the well, a controlled piston valve at the lower butt end of the tubing string interacting with the shell saddle for the purpose of its opening and closing when the tubing string is moved with the piston.

EFFECT: improving efficiency and processability of the method and device due to increase in power and selectivity of hydraulic impact on the bottomhole formation area at simultaneous simplification of the device and method.

5 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used for increase in amount of pumped fluid, oil extraction factor, and decrease in sedimentation of natural hydrate and hydrate-hydrocarbon sediments on borehole equipment elements. Proposed method consists in incorporating the device with radiator and controlled electromagnetic wave field generator with electrically driven rotary pump downhole motor bed. Note here that irradiation of electromagnetic wave field is performed in resonance frequency of downhole space. Said frequency is defined during testing. Note here that testing is carried out at preset time intervals while during intervals between tests said generator is changed into downhole resonance frequency mode to allow the irradiator to generate standing electromagnetic waves along downhole space axis.

EFFECT: higher efficiency of extraction.

FIELD: oil and gas industry.

SUBSTANCE: vibrator has body with inlet and outlet channels and rotor with blades, supported by bearing. A valve is mounted in body, made with slits and bottom with apertures in middle portion. Valve is mounted in body on thread with possible axial displacement. Rotor with blades and apertures in bottom is mounted on bearing in axial channel of valve. Slits of valve are made lower than rotor mounting position, to feed liquid into well, bypassing the valve, and above rotor position, with possible feeding of liquid into valve onto rotor blades after its axial displacement. Axial channel of valve is covered by lid with rod, with possible insertion thereof into rotor axial channel. Valve drive in the body is limited by transfer pipe at lower portion.

EFFECT: higher quality.

3 dwg

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