Device for oil production. RU patent 2505666.
 Device for regulation of water cone in well / 2505665Device contains a pump launched into casing string at pipe string with shank end underneath and connected to connecting tube; in the well there are two delivery channels, at that one channel is for oil delivery while the other one is for water delivery from stratum to the well. Channel inputs are located at different levels while outputs are directed to pump suction side. Shank end is equipped from outside with packer installed in casing string at the level of water-oil contact and radial holes of shank end are located higher than packer. At that below radial holes a hollow blind plug is inserted into shank end; connecting tube is inserted into the plug, at that tube can be moved along axis and fixed. However fixation of connecting tube in regard to shank end is made by split locking ring of circular section which is installed in inner groove of the hollow blind plug; this ring fixes the connecting tube in semicircular notches at outside surface of the tube. At that channel for oil delivery is formed by inner space of the casing string upwards packer, radial holes of the shank end and space between the shank end and connecting tube. Channel for water delivery is formed by inner space of the casing string downwards packer and inner space of the connecting tube. Inputs of both channels are located opposite perforated holes in water- and oil-bearing parts of stratum while outputs are directed to pump suction. Due to regulation of water and oil extraction the suggested device also allows preventing mixing of water and oil in process of their raising in the pipe string and producing of product that does not require subsequent separation into different phases; it also allows reducing probability of water-oil emulsion and paraffin deposition in result of fast transfer from water extraction to oil extraction. |
 Method for inter-well fluid pumping / 2503805Method includes packer installation above the production well bed, oil-water emulsion extraction from below-packer space by pump, descended at tube string, emulsion separation to oil and water in down-hole conditions, oil extraction from top part of above-packer annular space to oil pipeline, extraction of formation water and its pumping via water pipeline through injection wells into oil bed with undeveloped oil resources. Pump operation is provided in constant mode, oil-water emulsion is supplied through radial holes in tube string into above-packer annular space, where oil-water emulsion is separated. Water is extracted from above-packer annular space via subsidiary tube, the inlet of which is located below the level of water-oil contact, and its outlet is connected to the water pipeline fitted with flow metre. Oil extraction is additionally performed from tube string into oil pipeline, which is fitted with flow regulator and is connected to the subsidiary tube via bypass line, connected to the oil pipeline after flow regulator for water discharging into it at water pipeline repair works. |
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Method for down-hole treatment of gaslift well product / 2503801 Method includes use of de-emulsifying compound and pour point depressant (PPD). According to invention at bottom hole temperature up to 80°C both reagents are supplied together into pressure-actuated operating agent - gas. When bottom hole temperature exceeds 80°C, PPD is supplied to pressure-actuated operating agent and de-emulsifying compound is supplied into the product at wellhead. Note that water-soluble de-emulsifying compound is used for watered product of 40%, and for watered product of more than 60% there used is an oil-soluble de-emulsifying compound. Any of the said reagent types can be used in interval 40-60%. |
 Method for oil production from formation with abnormally low formation pressure / 2501940Method provides for extraction of formation liquid by means of a bottom-hole pump from vertical production wells drilled so that a sump is formed. A cavity is created in lower part of a productive formation in each vertical production well. In addition, flat directional production wells are drilled, thus attaching the face of each flat directional well to the cavity of the corresponding production vertical well, and mouths of flat directional production wells are interconnected with atmosphere. Diameter of vertical production wells is larger than diameter of flat directional wells. Mouths of flat directional wells are located for example near mouths of neighbouring vertical production wells. Creation of the cavity is performed for example by water jet washing-out of rock by means of a special adapter with a side water jet nozzle, and filling of the cavity with filler is performed for example by gravel alluviation. |
 Application of degradable fibers in solutions of inverted emulsions for well killing / 2499131Method of processing underground bed comprises injection of emulsion inverted solution in cased borehole cutting the bed to well killing. Said method comprises: oily continuous phase, nonoleaginous disperse phase and at least one bridging agent. formation contact with well killing solution and possibility for degradable material to degrade at least partially. Proposed method comprises: production of inverted emulsion for well killing including: oily continuous phase, nonoleaginous disperse phase and at least one bridging agent, injection of said solution in encased perforated borehole, production of filtration crust and its destruction to mallow the material to degrade. Proposed method comprises: production of inverted emulsion for well killing including: oily continuous phase, nonoleaginous disperse phase and at least one bridging agent. Placing the well killing solution in said borehole, formation of filtration crust and destruction of said crust whereat hydrolysis of degradable material destructs said crust. |
 Method for optimising extraction from well with artificial lifting / 2496974Method for optimising extraction from a well is proposed, in which an artificial lifting system in a well shaft is controlled, and multiple parameters of extraction on surface and in the shaft well are monitored. A well model with calculated data parameters is built. Then, measured data on working face and surface of the well is compared to the model data and reliability of the measured data is checked. After that, difference between measured data and modelled data is diagnosed, and operation of an artificial lifting mechanism is adjusted as per the above diagnostics results. |
 Well operation method / 2490436Well is equipped bottom upwards with a tubing string ended with a packer, submerged pump, switch, two outer and inner annulus of the tubing string which are located concentrically, tubes with holes at the outer tubing string. The well is splitted over the productive stratum. The stratal product is delivered by the submerged pump in a cyclic mode "delivery-stop" from the productive stratum through the tubing string, the switch, tubular annulus between inner and outer tubing string, tubes and holes of tubes into tubular annulus between the production string and outer tubing string. Pressure is created and maintained in the upper pert of the well; it should not be less than oil degassing pressure and more than permissible pressure to the production string. Separation of the stratal product into oil and water is arranged in the upper part of the well. Completeness of separation is controlled by the duration of a half of the operation cycle of the submerged pump till stoppage and by the distance between switch and the tube with a hole. Oil is delivered to oil line. Water is supplied through the switch to inner tubing string and through the pipeline to an injection well by borehole-to-borehole water pumping and/or through tubular annulus between the production string and outer tubing string and tubing string with a packer to the stratum over the packer by borehole water pumping. |
 Adaptive throttle-limiting filtering chamber of well completion system / 2490435Device contains a spherical body with at least one segment containing at least one section of throttle joints and one limiting. Stream is fed to the segment from the butt end, through side channels. Each input unit can be covered by a roller gate of the plug with thread which is input through the chamber body. |
 Method for separation and control of development of deposits drains with horizontal well, and device for its implementation / 2488686Method involves lowering to the well of a pipe string with a cable, control devices in the form of electric valves, pressure and temperature measuring sensors and with one or several packers isolating the borehole space. Sensors are used, the information from which is supplied to a measuring unit installed on the well head. Signals for opening and closing of control devices are supplied via the cable from the wellhead control unit. The product is lifted to the surface by means of a pump via inter-tube space. The well is built with a horizontal section passing in the formation with different permeability zones. Packers are installed in the horizontal section of the well, thus separating the formation zones with different permeability. The inter-tube space is isolated with a plug, above which there arranged one above another are upper and lower control devices arranged in a vertical shaft and equipped with measuring sensors. Zones with equal or similar permeability are interconnected with each other by being grouped in two flows interconnected with the borehore space and the input of the upper control device or the inter-tube space and the input of the lower control device. Outputs of control devices are interconnected with the pump inlet, and the value of opening of control devices is derived with frequency separation via one cable, via which parameters are picked up from measuring sensors, as per the readings of which the value of opening of each of the control devices is determined. Each control device is made in the form of an electric motor with a reduction gear, which are arranged in the housing, the rotating shaft of which is connected through a screw-nut connection to a pusher and a valve having the possibility of tight interaction with a seat, below which there arranged is a shell with an inlet in the form of channels, in which a compensating chamber with elastic walls is arranged, which is filled with lubricating liquid and interconnected with inner space of the pusher and sealed space located above the pusher. |
 Method of gas-lift oil extraction using energy of associated gas combustion in well / 2487992Method lies in accumulation of liquid and gas in a well, cyclic carryover of accumulated liquid from the liner to tubing string and throwing of liquid column by gas. According to the invention associated gas is separated from liquid-gas mixture and directed to the upper part of gas-lift unit to gas burning unit. Air under high pressure is fed to the same unit in order to provide conditions for gas-air mix burning ensuring high-speed burning process accompanied by sharp increase of temperature and pressure. In result it provides opening of return valve in the lower part of tubing string and throwing of liquid column by gas being a combustion product. Thereafter cycle of gas separation from liquid-gas mixture and its burning in gas-air mix is repeated as far as liquid and gas enter through the service valve from annular space to the lower part of submerged gas-lift unit at receipt of a signal from the earth control station. |
 Method of examining wells / 2244105Invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value. |
 Foam-forming compound for shutting wells / 2245441Foam-forming compound for shutting wells contains hydrocarbon liquid, mixture of surfactants, one of components thereof is water solution of lignosulphonate reagent of 25% concentration, herbal filling agent and 20% water solution of calcium chloride, as lignosulphonate agent reagent it contains powder-like technical lignosulphonate, and as other component of surfactant mixture - hexamethylentetramine, and as herbal filling agent - peat or grass flour with following ratio of components in percents of mass: hydrocarbon liquid 12-14, said water solution of technical powder-like lignosulphonate 17-21, hexamethylentetramine 0.17-0.63, peat or grass flour 3-6, said calcium chloride solution - the rest, while relation of mass portions between said water solution of technical powder-like lignosulphonate and hexamethylentetramine is 1: 0.01-0.03 respectively, as grass flour it contains pulverized herbal waste of grain bread production or similar substance. |
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Compound for blocking and shutting wells / 2245996 Compound includes water and inhibiting salt, as inhibiting salt contains processed electrolyte - side product during production of magnesium via electrolysis from carnallite, and additionally as reducer of filtering and thickener - carbooximethylcellulose polymer, and as colmatation agent - magnesium oxide with following relation of components in percents of mass: processed electrolyte - side product of magnesium production via electrolysis from carnallite 10.0-15.0, carbooximethylcellulose 2.5-3.0; magnesium oxide 1.0-2.0, water 80.0-86.5. |
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Well killing polysaccharide gel composition and method for producing the same / 2246609 Claimed polysaccharide gel contains sweet or mineralized water, polysaccharide gelling agent, boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and mixture of non-ionic and anionic surfactant (complex surfactant). Mixture of water soluble oxyethilated alkylphenols and their sulphoethoxylates in form of sodium salts or salts with triethanolamine is used as complex surfactant in amount of 0.1-0.5 kg on 1000 l of water being the gel base. Polysaccharide gel is obtained by dissolution and hydration of polysaccharide gelling agent in sweet or mineralized water (preferably monovalent ion solution) followed by treatment of obtained polysaccharide solution with aqueous solution including boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and complex surfactant. |
 Method for extraction of hydrocarbon deposit with sole water and extraction of hydrocarbon by sucker-rod compressor pump with separated intake of hydrocarbon and water / 2247228Method includes mounting compressor pump in such a way, that input aperture of tail piece was positioned below bed sole. Prior to that water cone in face-adjacent zone is destroyed by draining water through tail piece, connected to lower suck-in valve of compressor pump cylinder, and along behind-pipe space through side suck-in valve of compressor pump cylinder. In case of increase of hydrocarbon contained in drained liquid beginning of water cone destruction is assumed. Draining is continued until destruction of emulsion in water cone, formed in non-homogenous porous environment of bed at limits of hydrocarbon-water and water-hydrocarbon, separation of water and hydrocarbon streams and bringing current water-hydrocarbon contact to initial position. Then during extraction water is drained through tail piece, and hydrocarbon - along behind-pipe space. |
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Well stopping method / 2250360 Method includes preparation of technological liquid - water solution of sylvinite ore mixture with chlorine calcium by solving a mixture of components in hot fresh technical water, drained from oil and water preparation plants or bed water. During solution of sylvinite ore mixture with chlorine calcium in bed water the latter is drained from the well at temperature 60-90°C. Technological liquid is produced with solution density 1.23-1.37 t/m3. Then prepared technological liquid is fed into well shaft a bit lower, oppositely to zone and above ceiling of productive bed with forming of hydraulic column above the latter. Then well shaft to the mouth is filled with water. Value of technological liquid hydraulic column of high density on basis of said mixture, fed into well shaft above ceiling of productive column of technological liquid is taken in amount, necessary and enough from well stopping conditions. |
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Well killing composition / 2254454 Water-based composition that can be used for killing of well during pullout of hole and well remedial work as well as for temporary abandonment of well contains, wt %: carboxymethylcellulose3.5-4.5, sodium hydroxide1.5-2.0, copper sulfate 0.3-0.4, and methanol 4.0-16.0. |
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Method for shutting a well / 2255209 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. |
 Method for operating gas-lifting oil well, gas-lifting oil well and method for controlling flow of multi-phase flowing substance in gas-lift oil well / 2256067At 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. |
 System for controlling connections and feeding of electric current, oil well for extracting oil products (variants) and method for extracting oil product from oil well / 2256074System 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. |
FIELD: oil and gas industry.
SUBSTANCE: device includes housing, electric motor, submersible pump with discharge end and intake device and ejector. According to invention device is equipped with housing that forms annular channel with the housing downwards discharge end and upwards ejector. Ejector is located in intake device and made as annular slot. At that ejector inlet nozzle is connected to discharge end of submersible pump through annular channel for the purpose of partial return of pumped oil. At ejector output, before the first pumping step, there is a mixing chamber providing possibility of gaseous phase dispersion and pressure increase.
EFFECT: possibility of increasing pump efficiency during operation with gas-containing mixture at increase of permitted gas content in mixture at the pump intake; possibility of periodical pumping-out of gas accumulated at small and even zero quantity of liquid phase.
3 cl, 2 dwg
Field : oil producing industry; applicable in oil production with high gas content.
A device for extraction of oil, including submersible pump with motor and steps axial or screw type (patent RU 2368812 C1, F04D 13/10, publ. 27.09.2009), which allows you to extend the allowable content of pumped oil due to the dispersion of the gas phase by the volume of the liquid phase.
However, in this device for pumping oil with increased volumetric gas content, like all of centrifugal pumps, there is a reduction of pressure by one notch due to low values in steps at the entrance, but in a lesser degree than in the case of centrifugal pumps. To compensate for the pressure required to increase the number of stages, which increases the size of the pump. Another disadvantage of the device is a considerable decrease of pump efficiency due to the low efficiency of steps at the entrance to the pump running at a higher . In addition, the possible failure mode when the periodic hit by the pump significant gas volumes in the conditions of low or zero volume of the liquid phase.
Some of these shortcomings are eliminated in the device for extraction of oil, taken as a prototype, which contains a body, motor, submersible pump, input device with -dispenser and mounted on the pressure part of a submersible pump ejector (jet Pump) for the injection of pump-compressor pipe gas, in -disperser (patent RU 2274731 C2, E21B 43/00, publ. 20.04.2006). In the known device in the ejector is sent to the entire volume of the pumped the immerseable pump oil.
The disadvantage of this device are:
- low pump efficiencies with significant of the pumping medium, because the value of the head and efficiency of steps at the input of the pump remain low, although part of the gas phase is separated in -disperser and goes into the well annulus;
- further reduction in efficiency due to the consumption of energy in the -disperser and in running at full submission of the pump;
lack of periodic pumping gas accumulations;
- the complexity of the design.
The technical result, the attainment of which the claimed invention consists in the following:
- increase in pump efficiency when working on mixture;
- increasing the permissible gas mixture at the inlet of the pump;
- providing with the possibility periodically to pump gas accumulation at low and even zero quantities of the liquid phase.
To achieve the specified result device for extraction of oil, containing a motor, submersible pump with housing, pressure part, input device, and the ejector, according to the invention casing provided forming with housing annular channel below the pressure part and above ejector, ejector is located in the input device and is designed as a ring crack, receiving ejector nozzle connected to the pressure side of the submersible pump through the ring channel for a partial return oil, and the output ejector before the first stage pump is placed mixing chamber, providing the dispersion of the gas phase and increase pressure.
For placement of the cable to the motor power in the casing can be executed longitudinal break. In some versions, in the casing can be installed tube, hydraulically connecting the pressure part of a submersible pump from the suction bend ejector.
Thanks established in the input device submersible pump before first stage is provided to increase the pressure at the inlet that level and dispersion of a gas bubble in the liquid phase. The volume of bubbles by increasing the pressure is reduced with a corresponding decrease in volumetric gas content and, consequently, increasing the efficiency of the pump. Increase of efficiency contributes to the fact that powered ejector working fluid is spent not all hydraulic feed submersible pump, and only part of it.
The invention is illustrated by drawings, where 1 shows a longitudinal section of the proposed device, figure 2 - cross section a-A figure 1.
Installation for production of oil contains submersible pump 1, case 2, the pressure part 3, and the ejector 4, made in the form of a ring crack and placed in the input device 5 (1). Working bodies of a submersible pump 1 may be of centrifugal, diagonal or axial type. Output ejector 4 before the first stage pump 1 is mixing chamber 6. Lifting part 3 submersible pump 1 is connected with the suction bend 7 ejector 4. Connection can be carried out through the ring channel 8, educated housing 2 and casing 9, covering housing pressure part 2 below 3 and above ejector 4. For hydraulic connection it is possible to install inside the housing 9 handsets 10 (figure 2), which ends by the suction connection of the 7 ejector 4. Casing 9 has a longitudinal break 11 for placement of the cable 12, the motor power supply (not shown).
The proposed device operates as follows.
Oil through the input device 5 comes in submersible pump 1, which pumps it into the pressure part 3, where the oil gets in the ring channel 8 or tube 10, descends to the intake nozzle 7 and leaving the ejector 4 enters the mixing chamber 6, where it is mixed with the main stream of oil. In the mixing chamber of the 6th place turbulent mixing oil with intensive dispersion of the gas phase and the increase in pressure before entering the first impeller submersible pump 1. An increase in pressure that is approximately 20-40% of the pressure on the receiving socket 7, leads to a decrease in volumes of gas bubbles and, consequently, to reduce the volumetric gas content at the pump inlet 1, which contributes to increasing its efficiency.
The major gas accumulations input input device 5 periodically as their education is pumped pump 1 due to the presence of an internal contour of circulation of oil through the casing 9.
Thus, the proposed solution allows to improve the efficiency and increase the allowable content at the inlet of the pump for the bill of increase of pressure before the first impeller and, consequently, the decrease in volumetric gas content, and also provides for periodic pumping of gas accumulations with the small quantities of liquid phase at the expense of having an internal circuit through the casing 9.
1. Device for extraction of oil, including housing, motor, submersible pump with a pressure part and an input device, and the ejector, wherein the device casing provided forming with housing annular channel below the pressure part of a submersible pump and above ejector, ejector is located in the input device and is designed as a ring crack, receiving ejector nozzle connected to the pressure side of the submersible pump through the ring channel for a partial return oil, and the output ejector before the first stage pump is placed mixing chamber, providing the opportunity dispersion of the gas phase and the pressure increases.
2. Device for extraction of oil according to claim 1, characterized in that in the casing is made a longitudinal gap in hosting the cable to the motor power.
3. Device for extraction of oil according to claim 1, wherein the inside of the casing tubes are installed hydraulically connecting the pressure part of a submersible pump with an ejector.