Method of oil well operation

FIELD: oil and gas industry.

SUBSTANCE: method includes cyclic forced gas pumping from the annulus and pressure decreasing in it. Periodically the well flow header is partially closed. Pressure upstream the shutdown element of the header is increased to ensure the produced fluid supply to the expansion chamber of the tank with resilient element and to accumulate mechanical energy in the expansion chamber. Then full opening of the header shutdown element is performed. Pressure upstream the shutdown element is decreased, and fluid is displaced from the expansion chamber to the header due to the accumulated mechanical energy. Each cyclic volume increasing of part of the tank above the expansion chamber ensures annulus gas suction in it, and this volume decreasing ensures gas displacement to the header.

EFFECT: possibility of gas pumping from the annulus in tubing string of the well for different methods of mechanised oil production.

1 dwg

 

The present invention relates to oil industry and can be used in producing wells to reduce the pressure of the separated associated gas in the annulus and increase the flow of oil from the reservoir.

It is known that the accumulation of powder on the reception of deep pumps gas in the annulus leads to "release" the dynamic liquid level, reducing the flow of oil and a breakdown of the pumps due to the ingress of gas. In order to prevent disruption of the operation of the pumps the annulus of the well reported with the discharge manifold to the wellhead through a check valve.

For example, a device (Patent RF №2309240 C1. Wellhead equipment pumps oil-producing wells. Appl. 09.03.2006. Publ. 27.10.2007). It includes installed on the production casing flange faceplate with eccentric coupling for connecting the tee and in the discharge line of the well. The flange portion of the faceplate is made of vertical and horizontal channels for the installation of a bypass device. The pressure increase in the annulus leads to the opening of a spring-loaded overflow valve and the gas pass from the annular space into the pressure line of the well.

Also known return wellhead valve (Patent RF №2367775 C1. Return wellhead valve oil, Neftegaz� - type wells. Appl. 18.06.2008. Publ. 20.09.2009.), comprising a hollow body equipped with inlet nozzles for oil and gas, and discharging the mixture at the wellhead. In excess of the gas pressure above the pressure of the fluid stream on a value of 0.02 to 0.05 MPa spring-loaded plate valve off the seat and allows gas from the annular space in fluid flow under the regime of "soft" blend for optimal thermal environment in the area of the main valve. By reducing the gas pressure plate again closes the valve seat.

However, the application of both of the above analogues is inefficient in a high-pressure fluid in exhaust manifold. The gas pressure can not overcome this pressure and the dynamic liquid level decreases to the pump intake and the gas rip off his work.

It is known that the selection of gas or carbonated fluid from the annular space into the column of pump-compressor pipes (tubing) can be expressed by means of ejector mounted within the column. Pumped using a centrifugal pump, the liquid enters the nozzle of the ejector and ejective gas-oil mixture from the annular space into the tubing, thereby decreasing the gas pressure in the annulus (Patent RF №1825544. The device for lifting the carbonated liquid from the well. Appl. 29.06.1988. Publ. 12.10.1992 G.).

Device have�no significant disadvantage, consisting in significant hydraulic resistance to the movement of the working fluid in the nozzle of the ejector. They reduce the pressure and flow submersible pump.

The closest to the proposed is a method of forced pumping gas out of a well annulus into the tubing string with additional pump with flow-through plunger located in the tubing string, gazoperepusknogo the valves in the couplings on either side of the additional pump. (RF patent No. 122453 useful model. The sucker rod pump. Appl. 24.04.2012 Publ. 27.11.2012.). The plunger is made large in comparison with the main pump diameter, has a Central and radial channels, and placed in the Central spherical valve. Each turn of the pump, i.e., cyclically, from annular space selected portion of gas and ends with an additional pump into the tubing string. Thereby decreasing the gas pressure in the annulus.

The disadvantage of this method is the impossibility of its application in other methods of mechanized production of oil, for example submersible centrifugal or screw pumps.

The technical objective of the proposed method is the possibility of pumping gas from the annular space into the tubing string of the well for various open source�mandatory mechanized oil production.

The problem is solved in that in the known method, including cyclic forced pumping gas from the annular space and reduce pressure in it, according to the invention, periodically partially overlapping the discharge manifold of the well and increase the pressure before shut-off valve collector to support the flow of produced fluid in the expansion chamber of the tank with the resilient member and the accumulation of mechanical energy in the expansion chamber, and then produce a full opening of the closure body of the collector, resulting in reduced pressure in front of the locking body and the displacement of fluid from the expansion chamber into the reservoir through the accumulated mechanical energy, thus every cyclic increase in the volume of the tank above the expansion chamber results in absorption in gas from the annular space, and the decrease of the volume - subsequent exclusion of incoming gas into the reservoir.

The drawing shows the scheme of realization of the proposed method. In the well 1 to the columns of rods 2 and tubing 3 flat rod, screw or centrifugal pump (not shown). To the column pipe 3 connected at the mouth discharge manifold 4 with electrically driven shut-off valve (stopcock) 5, and to the annular space connected to the outlet 6 of the valve.Flick the collector 4 is connected to the tank 7 in which is placed an elastic element 8, which forms in the vessel the expansion chamber 9. Upper part of the container 7 are connected by lines 10 and 11 respectively with the annular pipe 6 and discharge collector for a shut-off valve 5. In lines 10 and 11 placed check valves 12 and 13. The installation includes a control station 14 by the electric 5, which are connected to the cables 15 and 16 of the actuator of the valve 5 and the pressure sensor 17.

The method is implemented as follows.

At low pressures in exhaust collector 4 collects the gas in the annulus along the lines 10 and 11, and the check valves 12 and 13 will flow into the manifold and then together with the liquid in automated metering installation.

When the pressure in the reservoir in the annulus also starts to increase the pressure of the gas decreases the dynamic level and the influx of formation fluid into the borehole. To avoid these complications calculated or empirically determined acceptable value of the pressure in the manifold, which requires already forced the evacuation of gas from the annular space into the reservoir.

When reaching the pressure in the reservoir 4, the pressure sensor 17 sends a signal to the control station 14 to a partial closure of the electrically driven shut-off valves 5, realized by cable 15.

At partial valve closure 5 in call�store 4 will begin to rise pressure, created bottom-hole pump. The liquid from the reservoir 4 will flow into the expansion chamber 9 of the receptacle 7, stretching the elastic element 8. When the element 8 extreme upper position at which the volume of the expansion chamber reaches the volume of the container 7, the pressure in the chamber reaches the maximum value at which the sensor 17 will send a signal to the control station 14 for opening the valve 5.

After that, due to the stored energy of the elastic element 8 the fluid from the chamber 9 will be pushed into the reservoir. During this period, the vacated volume of the container 7 above the elastic element 8 via the line 10 through a check valve 12 to flow the gas from the annular space. Once in the expansion chamber 9, the pressure reaches the pressure in the reservoir 4 and the elastic element 8 will occupy the lowermost position, the sensor 17 sends a signal to the control station 14 for a partial valve closure 5. Thereafter, the chamber 9 due to the receipt of fluid will expand, displacing the reservoir through the valve 13 has been received earlier in a container of gas. Then the cycle repeats.

Thus, the flow of gas in the tank and forced injection into the reservoir can be carried out at high pressures in the reservoir and at low pressures of gas in the annulus sufficient to overcome the hydraulic resistance in Lin�and 10 and the check valve 12. Loss of fluid into the discharge line of the well during the period of partial overlap of the crane 5 is compensated for in the subsequent cycle emptying of the chamber 9. During this period, on the pressure line to flow the liquid from the well and from the expansion chamber 9 of the receptacle 7.

The degree of opening of the stop valve 5 is determined based on the pressure values in the exhaust manifold and in the annulus, and the elastic element 8 and the allowable loads on the equipment of the well when the pressure in the reservoir during the period of overlap of the crane 5.

The volume of the vessel 7 and the switching frequency of shut-off valves 5 are determined based on the amount of gas flowing in the annular space to receive a deep-well pump.

As the container 7 and the elastic element 8 can be used and other technical means, in particular a cylinder with a spring-loaded piston.

Feasibility advantage of the proposed method are the conservation of flow rates at high pressure in exhaust manifold and the possibility of its application to different ways of mechanized oil production installations rod, screw and centrifugal pumps.

A method of operating oil wells, including forced cyclic pumping of gas from annular space and reducing it in pressure, wherein �then periodically partially overlapping the discharge manifold of the well and increase the pressure before shut-off valve collector to support the flow of produced fluid in the expansion chamber of the tank with an elastic element and accumulation of mechanical energy in the expansion chamber, and then produce a full opening of the closure body of the collector, provide reduced pressure in front of the locking body and the displacement of fluid from the expansion chamber into the reservoir through the accumulated mechanical energy, wherein each cyclic increase in the volume of the tank above the expansion chamber to provide suction in the annular gas space, and by reducing this amount - subsequent exclusion of incoming gas into the reservoir.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil production industry, in particular, to secondary and tertiary methods of enhanced oil recovery for beds with low oil saturation that envisage use of equipment for production of gaseous nitrogen with high pressure and temperature. Nitrogen compressor plant comprises a multistage piston-type compressor with a power drive unit made as diesel engine, and gas-separating unit. Output of the compressor intermediate stage is coupled to input of gas-separating unit. Output of gas-separating unit is coupled to input of the compressor stage, which follows the intermediate stage. At that nitrogen compressor plant includes heat exchanger, which working medium input is coupled to the compressor output. Input of the compressor heat exchanger is coupled to exhaust output of diesel engine. Gas-separating unit is made as a hollow-fibre membrane unit. Output of the heat exchanger working medium is coupled to input of additional heater. At that output of the additional heater serves as output of the station.

EFFECT: development of more effective means for oil extraction from low-permeable collectors complicated by high paraffin content.

8 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry and can be used for annular gas bypassing to the flow string in wells operated by sucker-rod pump units. Task of the invention is to perfect design of the downhole device for annular gas bypassing in order to improve operational efficiency of the well sucker-rod pumping equipment notwithstanding temperature conditions of the well operation and pressure of annular gas. The device is placed in the well annular space over the well fluid level in the flow string collar. The device comprises a return valve and a radial hydraulic channel. In the collar lower part there is a radial hydraulic channel interconnected to the well annular space at the one side through the return valve and to the flow string cavity at the other side through a jet device. At that axes of the radial hydraulic channel and the jet device are crossed in the nozzle area of the latter. Besides the device comprises a flow string with a whipstock for gas-fluid flow in it. The whipstock is made as a bushing capable to be fixed in the flow string collar. Length of the whipstock for gas-fluid flow is less than distance between receipt and discharge of the jet device. Axes of the radial hydraulic channel and the jet device are perpendicular. Fixation of the whipstock for gas-liquid flow in the flow string collar may be implemented by equipping the flow string collar with an inner groove and the whipstock for gas-liquid flow with a ring holder.

EFFECT: usage of device allows reducing pressure of annular gas notwithstanding temperature and pressure conditions thus increasing life between overhauls for the sucker-rod pumping equipment; besides, this device allows reducing pump-setting depth for the sucker-rod pump due to increase of fluid level over the pump thus reducing consumption of the flow string and pump rods and increasing life between overhauls for the units.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: according to the method the hydraulic fracturing of formation is performed. After hydraulic fracturing of the formation in the well the proppant underflash is left. From above in addition from the coarse fraction proppant the bridge with a rated length is created. This length is selected in view of the condition of providing of counter-pressure on the proppant in the hydraulic fracturing crack sufficient for holding of proppant in a hydraulic fracturing crack at decrease of liquid level in the well down to the well bottomhole level. The package of downhole pumping equipment includes the antisand filter. During the well operation the antisand filter is placed directly over the proppant bridge. The liquid is sampled. The liquid level during liquid sampling - operation is maintained at the level of the deep-well pump.

EFFECT: increase in oil production.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: as per the method, continuous lowering of a flexible pipe is performed into an internal cavity of tubing string to the well bottom. Gas is supplied to the well annular space. At the same time, gas is supplied to the space between the flexible pipe and the tubing string directly from the pipeline of the same well. Killing liquid is removed to day surface via the flexible pipe. Gas is supplied when the flexible pipe achieves killing liquid level. The flexible pipe is lowered at the specified speed from killing liquid level to the well bottom. Flexible pipe lowering speed and minimum required gas consumption providing killing liquid removal to day surface is determined as per an analytical expression.

EFFECT: improving efficiency of removal of killing liquid from a gas well due to continuous removal of liquid, reduction of gas consumption and power consumption.

1 ex, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: set of invention can be used, primarily, at development of remote oil deposits under extreme climatic conditions. Proposed process comprises recovery of associated oil has (AOG) at locations of oil separation via multistage low-temperature separation of AOG to stripped gas (SG) and dry gas condensate of AOG. This process involves separate delivery of DSG and AOG gas condensate via pipeline to the points of their accumulation, treatment and application. Note here that they are delivered via pipes to mid stations of their accumulation, treatment and partial application. These stations are located at distances not exceeding several tens of kilometres from oil fields. SG is liquefied at mid stations to produce liquefied natural gas for supply to local consumers. AOG gas condensate is subjected to deeper drying and cleaning of sulphur and other harmful impurities. LNG and dry AOG gas condensate produced at mid stations are accumulated in separate storage tanks. These products are carried by, mainly, regional line aircraft fuel carriers to regional refineries. Said refineries produce automotive propane-butane fuel and aircraft condensed fuel for local consumers as well as stock for consumers of petrochemical products as wide fraction of light hydrocarbons. The latter are delivered to other regions by, for example, medium-range tanker aircraft.

EFFECT: higher efficiency owing to almost full recovery and application of associate oil gas.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method a geologic structure is identified within the area of a deposit. Potential reservoir beds are identified in the section of rocks above the deposit, the direction of their highs - uprising and three-axis orientation of systems of subvertical fracturing is identified. Development and inspection wells are constructed with opening of the reservoir beds above the deposit height. Pressure and temperature survey is performed in the development wells and the composition of formation fluids is identified for all the wells. According to the results of the survey data depressurisation of the deposit is recorded. The inspection wells are constructed close to the wells intended for monitoring of sealing at the borehole annulus and the deposit in the direction of the subvertical fractures and uprising of the potential reservoir beds above the deposit. A change in pressure and temperature is identified for depth intervals of the reservoir beds on the real time basis.

EFFECT: reduced time for the detection of potential cross-flows of hydrocarbons to the above reservoir beds in result of the pressure failure in its cover and the borehole annulus of the wells in order to take measures on its elimination and prevention of potential blowouts to the surface.

1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: invention suggests hydraulic pump smart device for oil production and acquisition and storage of data from the well bottom that comprises jet pump unit, the lower isolation valve and unit with electronic instruments, which form a united and integrated unit actuated by operating fluid injected to the well from the ground oil lifting, closure of the well bottom, recovery of pressure in the formation and lifting of the device to the surface. The invention also discloses the method for oil production, receipt and recording of data from the well bottom using the above device.

EFFECT: performance of one complex function consisting in lifting of fluid and recording of data from the well bottom by means of temporary closure of the well.

17 cl, 11 dwg

FIELD: chemistry.

SUBSTANCE: method comprises drying a polymer solution until complete evaporation of water; heating the polymer formed after drying the polymer solution, and determining the temperature range of active decomposition of the polymer at a given heating rate, as well as the degree of decomposition of the polymer in said temperature range; drying, performing thermal analysis in the temperature range which includes the temperature range of active decomposition of the polymer, and calculating weight loss of a weighed amount of the sample of porous medium and a weighed amount of the same sample of porous medium after pumping the polymer solution; determining the weight concentration of the polymer that has penetrated the porous medium based on the obtained values.

EFFECT: high accuracy of the obtained data and rapid analysis.

6 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves destruction of massif of a hydrate-containing manifold with high-pressure water jets, formation from destructed material of pulp in a near-bottom volume covered with a dome, lifting of the pulp containing gas and gas-hydrate onto a floating structure via a pipeline and separation of the pulp into gas, water and solid material with gas transfer to a state suitable for transportation. According to the invention, massif of the hydrate-containing manifold is converted to a solid body-liquid fine suspension with gas-hydrate particle size of 10-20 mcm. For that purpose, it is influenced with high-pressure jets formed in the near-bottom volume covered with the dome. Besides, the volume of the pulp formed in this volume is treated with an ultrasound with parameters causing cavitation effects in it. A hydrate-containing suspension is formed with content in it of a disperse phase of gas-hydrate of up to 20-25%. Capacity of destruction devices of massif of the hydrate-containing manifold is controlled proportionally to pressure in the pipeline in its near-bottom section. An ice pulp formed at dissociation of the gas hydrate is used for cooling of compressed gas - a product of dissociation of a gas-hydrate pulp.

EFFECT: increasing well performance efficiency of a gas-hydrate deposit.

6 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: housing of multi-stream switching manifold (hereinafter referred to as MSSM) has several inlet fittings and one common outlet fitting. MSSM housing has channels from each inlet fitting up to inner surface of the flat bottom area where replacement part for protection of the housing can be installed while repair can be made by replacement of this part without disassembly. At the top the housing is covered by the lid with tube for connection to measurement device. Product from one well comes through channel in MSSM housing to hollow rotable selector, then through hollow shaft to lid cavity and through tube in the lid it is delivered for measurement. Fittings of remaining wells are communicated with common outlet of the housing.

EFFECT: higher reliability of operation.

5 cl, 1 dwg

Connection-valve // 2481462

FIELD: mining.

SUBSTANCE: connection-valve includes cylindrical casing closed from one side by cover with holes, in the central hole of which there is a collar, cylindrical limit stop located from the other side of cylindrical casing, around which there is a spring. Inside the cylindrical casing in sealing elements there is a ceramic insert with cylindrical hole inside capable of movement along the cylindrical casing axis from the collar to cylindrical limit stop and contacting the spring. Cylindrical limit stop when contacting the ceramic insert is capable to create isolated chamber, in which there is a compressed spring. The area of holes in the cover is by 1.5-2.0 times more than the area of ceramic insert cylindrical hole, and the area of cylinder surface, the bottom of which is the cover and the top is the ceramic insert, correlates to the area of ceramic insert cylindrical hole section as 1: (1.0-2.72).

EFFECT: exclusion of cavitation and provision of required flow rate at pumping into the injection well.

2 dwg

Check valve // 2463439

FIELD: machine building.

SUBSTANCE: check valve comprises body and branch pipes for primary and dischargeable components. Shutoff element consists of fixed and moving parts interacting over common equidistant surface and is arranged inside valve body along dischargeable component line. Shutoff element is made up of seat with spring-loaded disc and arranged inside inner unit case. Said inner block represents a shaped solid of revolution, preferably, a cylinder, arranged inside valve body along dischargeable component line. Shutoff element lengthwise axis is located perpendicular to dischargeable element branch pipe axis. Chamber communicated via channels with valve body inner chamber is arranged above valve disc. Said channels are open upstream. Cover is fitted in valve body mating part to lock inner unit with shutoff element. Said inner unit is heat-isolated from valve body by nonmetallic ring seals. Note here that gas chamber is arranged between said inner unit and valve body. Valve body cover represents hollow cylinder with one closed end face to make closed gas chamber inside said cover, between cover end face and inner unit end face.

EFFECT: higher reliability.

2 dwg

FIELD: oil-and-gas production.

SUBSTANCE: proposed method consists in forcing warm extracted medium, for example, reservoir fluid with temperature of 15-25° over outer shaped surface of intenral unit accommodating shutoff valve. Shut off element consists of fixed and moving parts interacting over common equidistance surface and is made up of, preferably, of seat with spring-loaded disc arranged in inner unit case. Valve body has inlet branch pipe and hydrocarbon product discharge branch pipe and cover arranged on body rear. In keeping required temperature of inner unit, it is isolated from valve body by nonmetallic, preferably, rubber mix ring seals. Note here that, additionally, heat losses are reduced by making air chamber between inner unit face and valve body cover.

EFFECT: higher reliability of valve operation.

2 dwg

Check valve // 2463437

FIELD: machine building.

SUBSTANCE: check valve comprises body and branch pipes for primary and dischargeable components. Shutoff element consists of fixed and moving parts interacting over common equidistant surface and is arranged inside valve body along dischargeable component line. Chamber is arranged above valve disc communicated with valve body inner chamber. Note here that channels open downstream. Cover is fitted in valve body mating part to lock inner unit with shutoff element. Said inner unit is heat-isolated from valve body by nonmetallic ring seals. Note here that gas chamber is arranged between said inner unit and valve body. Link mat be arranged inner unit case end facing the cover to interact with said case by its one end and by opposite end, preferably, shaped one, with valve body cover inner surface made up of hollow cylinder with one closed end. Clearance is provided for between cover thrust surface and inner unit end face. Said valve body cover inner surface made up of hollow cylinder with one closed end interacts with inner unit case end face.

EFFECT: higher reliability.

3 cl, 3 dwg

Cutoff valve // 2447259

FIELD: oil and gas industry.

SUBSTANCE: invention comprises a casing, inlet and outlet nozzles, an adjustment mechanism comprising spring-loaded horizontal piston and vertical stem that interact with each other by flat longitudinal surfaces with stops and a cocking mechanism. The cocking mechanism consists of a casing bushing, externally threaded and internally double-stepped movable bushings. Besides, the casing holds a seat and a lock connected by an eye with a vertical spring-loaded stem. Section of the inner cylindrical part of the casing is made with a displaced centre along a downward vertical axis, the upper part of the inner double-stepped movable bushing has smaller diametre compared to the lower one, and the non-spring-loaded end of the spring-loaded horizontal piston is smaller along the diametre of the end spring-loaded with the spring.

EFFECT: increased pressure of actuation, simplified design, higher reliability and durability.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: at pump method of oil production in the wellhead there installed is control valve unit. When the mode of the well is being switched, measurements of dynamic level of liquid are performed in the well shaft. Then, by controlling the volume of produced oil flow through control valve unit there determined is the value of dynamic level of liquid in the well shaft, at which the stable daily operating mode of the well is provided. Value of buffered pressure at the well head is recorded when the oil is being lifted, which is maintained during pump operation of the well. At gush production method of oil, the design operating conditions of the well are determined as per dynamic level of liquid in the well shaft, buffered pressure and the rate of flow. Then, value of buffered pressure at the well head is recorded when the oil is being lifted, which is maintained during gush operation of the well. Methods are implemented by means of the device for oil production from the well, which contains the tubing string the upper end of which is connected to delivery line and control valve unit installed in the wellhead. Body of control valve unit is made of three bushings coaxially connected to each other on the thread. Front bushing is made in the form of pressure nut. Middle bushing has side channel interacting its inner cavity to delivery line; inside the bushing there fixed is the seat and arranged is spring-loaded valve in the form of ball. End bushing has inner open cavity on the side of its output end, in which there arranged is control mechanism of wellhead buffered pressure, which includes thrust disc with pusher. Pusher is led through front edge of the end bushing and seal in it to inner cavity of middle bushing to bear against the valve in the form of a ball. Inside end bushing on the thread there screwed is control stock the shank of which with the element on the end for rotation of stock has smaller diametre and is led to the outside from end bushing through the hole made in the pipeline wall of the wellhead to external space of the well head.

EFFECT: reducing oil production losses, shortening the time for work execution, excluding material costs and hardware for bringing the wells into operation after they have been switched to another operating mode.

9 cl, 2 dwg

FIELD: oil-and-gas production.

SUBSTANCE: device includes lubricator, corresponding to metallic pipe, in top and bottom part of which there are installed gates and three-way cock for installation of manometre gage and pressure release, cartridges block for location of solid rods of surface active agents, installed over the lubricator and fixed on wall bracket, control assembly, single-acting air actuator, connected to control assembly and cartridges block, disk with opening for introduction of solid rods of surface active agents, installed immovable. Opening for introduction of solid rods of surface active agents into lubricator is located co-axial to lubricator. Gates are implemented in the form of ball cocks with air actuators connected to control assembly. Cartridges block is implemented in the form of set of hollow cylinders located vertically and is installed over disc with opening for introduction of solid rods of surface active agents into lubricator with ability of rotation around axis up to overlap of cavity of each of cylinders with opening for introduction of solid rods of surface active agents into lubricator. Control assembly is connected to feed pipe.

EFFECT: automation and providing of safety of introduction of solid rods into well.

1 dwg

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production, particularly to devices for maintain a regular regime of production well operation, for instance oil wells or oil-and-gas wells, or oil-and gas condensate wells and others, characterised gas presents in hole clearance. It includes hollow case, equipped with inlet connection for main component supply - stratum fluid and inlet connection for dropped component supply, also outlet connection for discharge of the main and dropped components. In the return valve case installed internal cup shaped block, which has canal in its lateral wall for annular gas discharge, located angularly to stratum fluid flow vector with an ability to wash internal surface of the cap lateral wall with the fluid.

EFFECT: maintain a regular regime of production well operation due to wellhead assembly reliability increase, particularly because of return valve ability to wash internal surface of the cap lateral wall with the warm fluid, optimal thermal regime in return valve zone in case of bad external conditions of the wellhead.

17 cl, 6 dwg

FIELD: oil and gas production.

SUBSTANCE: invention elates to gas-and-oil producing industry, particularly to devices for providing of undisturbed operation behavior of oil or oil and gas wells, described by annular show of gas. It includes hollow casing, outfitted by inlet branch of main component - formation fluid, mainly, oil, and inlet branch of throw down component, mainly, annular gas, and also outlet branch of mixture of main and throw down components. In casing of back pressure valve it is mounted inner block with casing in the form of sleeve with at least one opening, in its side wall for withdrawal of annular gas. External surface of side wall of sleeve is implemented with ability of its washing-off by formation fluid flow. Back pressure valve also includes installed in inner block sluice, containing system, formed not less than from two locking elements, each of which allows mobile and resting part. It provides undisturbed operation of well ensured by back pressure valve, implemented with ability of washing-off of sleeve of its inner block by warm formation fluid and guarantees outlet of throw down annular gas into flow of throw down in the same flow direction as formation fluid.

EFFECT: invention provides creation of optimal thermal conditions in area of back pressure valve at any conditions in area of wellhead, ensured by new industrial design of sluice, defining conditions of gas feeding into back pressure valve.

14 cl, 3 dwg

FIELD: equipment for sealing or packing boreholes or wells.

SUBSTANCE: valve has metal body with inlet and outlet ends in which ceramic members are inserted. Valve also comprises replaceable reducer preferably formed ceramics. Flange unions connected to reducing valve provide transition from reducer orifice having small diameter to pipe having larger diameter. The pipe is communicated with oil refining equipment. Flange union has metal body with through channel in which ceramic member is arranged. Through channels of the ceramic members are preferably conical and have diameters gradually increasing from outlet orifice of reducing valve to inner orifice of the pipe.

EFFECT: increased service life.

41 cl, 15 dwg

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