Method for reduction of water influx to horizontal hole in fractured-porous type reservoir

FIELD: oil and gas industry.

SUBSTANCE: method includes determination of an average distance between fractures, division of the horizontal hole in sections by packers, running in of devices for water influx control at the tubing string to the horizontal hole, product withdrawal from the horizontal well. At that the horizontal hole is divided by water-swellable packers into sections with length of each section from 20 m up to 50 m depending on the distance between fractures and length of the horizontal hole. The devices for water influx control in the horizontal hole have openings in walls with diameter d, which is comparable to the size of oil capillary tubes for this reservoir and the openings are made of water-repellent material. Length of each device for water influx control is from 5 m up to 12 m, and total number of devices does not exceed 5 pieces between packers in each section, total number of the openings N in devices for water influx control in the whole horizontal hole, depression and diameter d of the openings is determined by the ratio. Product from the well is produced provided that hydrodynamic forces created by bottomhole pressure do not exceed capillary forces of oil movement through openings in the devices for water influx control, i.e. depression in the well meets the above ratio.

EFFECT: increase in oil recovery factor.

1 dwg

 

The invention relates to the oil industry and can be used to reduce water production in horizontal wells during the development of fractured porous reservoir crude oil.

The known method of manufacture of the device flow control, which provide the material with adaptable form; form element flow control by adding to the material adapted to form a hydrophilic polymer in an amount sufficient so that the item flow control limiting the flow of water flowing through it. Additionally heat the material to adapt the form for giving him his first form, before adding a hydrophilic material and compress and cool the element flow control after adding a hydrophilic material, to give the element controlling the flow of the second form. Place the item flow control on the outside of the tubular element, in which there are channels that provide a passage for the flow of fluid between the tubular element and the element of flow control. Hydrophilic polymer expands inside the element flow control caused him some water. Shrink item flow control and add the hydrophilic material in the element of the regulation on the eye after it is compressed. While providing a material adapted to form use the foam with substantial permeability. The device controlling the flow that contains the item flow control, formed from a material adapted to form and hydrophilic polymer, placed inside a material adapted to form in sufficient quantity so that the item flow control limiting the flow of water flowing through it. The control unit stream containing tubular element, which has at least one channel for fluid. The control unit stream containing a metal grid between the tubular element and the element of flow control. The device flow control, containing a passage for the flow of fluid between the tubular element and the element of flow control. The device flow control, in which the hydrophilic polymer is able to restrict the flow of water caused him some water. The device flow control, in which control flow control is made so that when it is placed in the hole it was expanded to contact with the borehole wall. The method of obtaining fluid from a reservoir, in which: provide a control unit p is current, the containing element flow control, formed from a material adapted to form and a given quantity of hydrophilic polymer, placed inside a material adapted to form in sufficient quantity so that the item flow control limiting the flow of water flowing through it; set the device controlling the flow element flow control located in the first, compressed state in a given location in the borehole; provide the element controlling the flow of the opportunity to take a second, expanded shape; and remove the fluid from the reservoir into the well by directing the fluid flow through the flow control. Additionally provide an element of flow control on the outside of the tubular element, having at least one channel made with the possibility of receiving through it the fluid in the tubular element. When the device software flow control provide a passage for the flow of fluid between the tubular element and the element of flow control. When the device software flow control is placed a metal grid between the tubular element and the element flow control or outside of the element flow control. Hydrophilic polymer expands inside the element for the regulation of pot is ka caused a certain amount of water to prevent the flow of water flowing through it. Material to adapt the form includes a foam with substantial permeability. To ensure that regulates flow of the second, extended, form heat the material to adapt the form to a temperature exceeding the glass transition temperature (RF application No. 2012109103, CL E21B 43/12, publ. 20.09.2013).

The disadvantage of this method is the low degree of reduction of water inflow into the well and, as a consequence, low oil recovery.

The closest to the proposed invention the technical essence is a method of separation and control of production inventory, drained horizontal bore and a device for its implementation, including the descent into the well pipe string, cable, control devices in the form of electric valves measuring gauges temperature and pressure and with one or more packers, divisive downhole space. Apply the sensor, which serves for the measurement unit installed on the wellhead. Signals for opening and closing the regulating devices served by cable with wellhead control unit. The rise of products on the surface of the implement pump in in-line space. This well built with a horizontal segment passing through the formation with various the areas of permeability. The packers are set in the horizontal section of the well, separating the zone with different permeability. In-line space alienate the cap, above which are placed one above the other of the upper and lower regulating device, placed in a vertical hole and equipped with measuring sensors. Areas with the same or very similar permeability reported between the groups in the two streams, is in communication with the downhole space and upper entrance control device or in-line space and sign the bottom of the regulating device. The outputs of the regulating device in communication with the pump inlet, and the amount of opening of the regulating devices produce a frequency division by a single cable, which produce and removing parameters from the measuring sensors, the readings of which determines the amount of opening of each of the regulating devices. Each regulating device made in the form housed in the motor housing with gear, torque shaft which is connected through a connection "screw-nut" with the plunger and valve made with the possibility of a tight interaction with the saddle, below which is placed a glass of input channels that hosts the compensation chamber with flexible walls filled with lubricating fluid and is reported with the internal space of the plunger and the sealed space, located above the pusher (RF patent No. 2488686, CL E21B 43/12, E21B 43/14, publ. 27.07.2013 - prototype).

The disadvantage of this method is the complexity of the event and the large capital costs, as well as a low degree of reduction of water inflow into the well and, as a consequence, low oil recovery.

In the proposed invention solves the problem of reducing water production in horizontal wells and, consequently, increase the oil recovery factor.

The task is solved in that in the method of reducing the water inflow into the horizontal wellbore fractured-porous collector, comprising determining an average distance between cracks, the separation of the horizontal wellbore section packers, downhill tubing device for controlling flow in a horizontal well bore, the selection of production from horizontal wells, according to the invention the horizontal wellbore share swollen packers into sections, with the length of each section from 20 m to 50 m depending on the distance between the cracks and the length of the horizontal wellbore, the device control flow in a horizontal wellbore is performed with the diameter d of the holes in the walls comparable to the size of the capillary tubes for oil in this reservoir, and the holes made of a hydrophobic material, the length of each device is VA control flow performs in length from 5 m to 12 m and set in the amount of not more than 5 pieces in each section between the packers, the total number of holes N in the control devices of the flow around a horizontal shaft, depression and diameter d of the holes is determined from the condition

Nd(Ppl-PC)4σcosθ,(1)

where RPL- reservoir pressure (PA)

PC- downhole pressure in a horizontal borehole, PA

σ is the surface tension coefficient at the boundary of selected water - surface control device inflow, PA·m,

θ is the wetting angle of water with the surface of the device control flow, degrees,

the extraction wells are subject to hydrodynamic forces generated by the downhole pressure does not exceed the capillary forces of the promotion of oil through the holes of the devices in the control flow, i.e. to the depression in the well to satisfy the relation (1).

The invention

The oil recovery fractured porous reservoir oil reservoir is significantly influenced by the time of horizontal wells to full irrigation. Water breaks on t is Eminem or from the water-bearing part of the reservoir, either injection wells or in the aggregate, which leads to a rapid flooding of horizontal wells. Due to the difference in viscosities of oil and water the predominant flow in the well is water. This is especially true for reservoirs with high-viscosity oil. Application device control flow can partially reduce the proportion of water in the stream along the horizontal wellbore. However, existing technical solutions do not fully allow you to perform this task in full. In the proposed invention solves the problem of reducing water production in horizontal wells and, consequently, increased recovery factor. The problem is solved as follows.

Figure 1 shows the scheme of the plot extractive horizontal wells in reservoir devices installed control flow. Legend: 1 - reservoir oil reservoir, 2 - open horizontal wellbore, 3 - vertical cracks, 4 - bearing part of the reservoir, 5 - similar to swollen packers, 6 - tubing, 7 - device control flow, S is the length of one section between the packers 5, x is the length of one device to control flow, KSS - water contact.

The method is implemented as follows.

On the massive oil deposits, reservoir to the second presents porous fractured carbonate sediments, conduct 3D seismic surveys. According to the results establish the distribution of microtrain in the reservoir. Depending on the objectives pursued design horizontal well. According to the project the site of the Deposit 1 (figure 1) reveal a horizontal well length L with selection based core. The design of the horizontal shaft 2 perform open because of the breed for this collector is resistant to shattering. The results of core analysis to determine the density of fractures and their orientation determines that cracks 3 have a predominantly vertical direction.

Works are in an uncased borehole, obwodnica in the operation, and the cut of this well is far ahead of proficiency in this area, indicating breakthrough of water through cracks. Carried out in the borehole hydrodynamic studies, determine the distance between the cracks or the size of the blocks of rock.

During operation of the well water will penetrate in the vertical cracks to the horizontal shaft 2 or from the water-bearing portion 4 of the reservoir or injection wells, or both together. To prevent flooding in the open horizontal tube (2) provide for the placement swollen packers 5.

Depending on the distance between the cracks and the length of the horizon is inogo barrel L decide on the separation of the horizontal shaft 5 m sections with the length of each section S from 20 m to 50 m Calculations determined that the length of the trunks of most horizontal wells more than 200 feet when the section length is less than 20 meters there is a necessity to install a large number of swollen packers, which leads to economic unprofitability of such wells. When the section length more than 50 meters, oil recovery is significantly reduced, as this will decrease the effectiveness of control devices inflow. The calculations showed that the maximum oil recovery is achieved when the distance between the cracks is less than 1 m, the length of the sections S ranges from 20 m to 30 m, while the distance between the cracks more than 1 m is the length of the sections S from 30 m to 50 m In General, the distance between the cracks for most fractured-porous, porous-fractured and fractured carbonate sediments is, as shown by the results of the research, from a few centimeters up to 5-6 meters

Similar to swollen packers 5 down on the flexible tubing pipe 6 with the attached devices control flow 7. These devices 7 are perforated tubing made of a hydrophobic material. The perforations are filled with diameter d, is comparable to the size of the capillary tubes for oil in this reservoir, i.e. within a few millimeters.

According to capillary effects, manifested the and the interface of two phases, to a drop of water is not passed through the perforation hole diameter d, it is necessary that the hydrodynamic forces created by the pressure differential between the reservoir and downhole pressures did not exceed the capillary forces.

The mass of water droplets or water layer creates a pressure at the top of the round control unit inflow of Pin=ρgh, where ρ is water density, g is the acceleration of gravity, h is the height of water droplets or water layer. At the bottom the pressure is negative, therefore, in General, of circular cross-pressure Pincan be neglected.

For each perforation holes along the horizontal wellbore can write the condition under which a drop or layer of water will not pass through the perforation hole:

Ppl-PCN4σcosθd,

or

Nd(Ppl-PC)4σcosθ,(1)

gder PL- reservoir pressure (PA)

PC- downhole pressure in a horizontal borehole, PA

σ is the surface tension coefficient at the boundary of selected water - surface control device inflow, PA·m,

θ is the wetting angle of water with the surface of the device control flow, degrees,

d is the diameter of the perforations m,

N is the total number of perforations along the horizontal wellbore, PCs

Given the diameter of the perforations d, downhole pressure PC, surface tension σ and the cosine of the contact angle for hydrophobic surface cosθ, counting the number of perforations N from the relation (1).

According to equation Poiseuille flow, the flow of oil from one sprocket holes will be:

q=πd4(Ppl-PC)128μnL,(2)

where µn- oil viscosity at reservoir conditions, PA·s,

L is the length of the horizontal wellbore, m

The oil production rate of the entire horizontal well:

Q=qN.(3)

Thus, by varying the values of d and N, choose their optimal value, so that the oil flow rate Q of the horizontal well was comparable with the rate of horizontal wells without the use of control flow.

If the length of one device to control flow x from 5 m to 12 m, the total number of devices in one section of length S from 20 m to 50 m between packers 5 is not more than 5 pieces length x due to a standard set of tubing to reduce the cost of production, and their number is the fact that the length of the device control flow cannot exceed the length of the section S.

Just along the horizontal wellbore number of these devices will be M=m·x pc. Then on one device control flow you want to put the N/m hole diameter d or the density of holes on each device should be N/(m·x) resp./m

After these events well put in the work. Development lead to full cost-effective production site.

The result of the implementation of this method is the reduction of the water content of produced fluids horizontal wells and, as a consequence, enhanced oil recovery.

Examples of specific vypolneniyasvoey

Example 1. On the massive oil deposits, productive formations which presents porous fractured carbonate sediments, conduct 3D seismic surveys. According to research results, establish the distribution of microtrain in the reservoir. Depending on the objectives pursued, the design horizontal well. For example, for a compromise between achieving the maximum rate selection and maximum values of the recovery rate, it was decided the horizontal trunk to hold at an angle of 45° to the direction of predominant fracture. According to the project the site of the Deposit 1 (figure 1) reveal a horizontal well length L=500 m, with selection based core. The horizontal diameter of the barrel to the bit - 140 mm Design horizontal shaft 2 perform open because of the breed for this collector is resistant to shattering.

The initial reservoir pressure reservoir 9 MPa, the oil capacity is 10 m, the permeability of 170 MD, porosity - 0,13 D. units, the viscosity of the oil at reservoir conditions is 50 MPa·s, the density of the oil at reservoir conditions - 890 kg/m3the initial oil saturation - 0,810, the roof of the reservoir lies at a depth of 820 m, oil-water contact at a depth of 830 m

The results of core analysis to determine the density of fractures and their orientation. Studies have shown that the distance between cracks is mi or the size of the rock blocks is 1 m Crack 3 have a predominantly vertical direction. Because the reservoir presents oil-water area, the aquifer with part 4 of the reservoir during operation of the well water will penetrate in the vertical cracks to the horizontal shaft 2. To prevent flooding in the open horizontal tube (2) provide for the placement swollen packers 5.

Since the distance between the cracks is small - 1 m, and the length of the horizontal wellbore L=500 m, then decide on the separation of the horizontal shaft 5 to m=20 sections, with the length of each section S=L/m=500/20=25 m

Similar to swollen packers 5 down on the flexible tubing pipe 6 with a diameter of 73 mm installed control devices tributary 7. These devices 7 are perforated tubing made of a hydrophobic material, for example a hydrophobic PVC plastic. The diameters of the perforations are d=2 mm. Given downhole pressure PC=7 MPa, surface tension σ=70 MPa·m and the cosine of the contact angle for hydrophobic surface cosθ=1, count the number of perforations from the relation:

Nd(Ppl-PC) 4σcosθ=210-3(9-7)10640,071=14286Wt.,

Take N=14400 PCs, then if the length of one device to control the flow x=10 m, then the number of such devices in one section will be 2 pieces, because of their length cannot exceed the length of the section S=25 m, and only along the horizontal wellbore number of these devices will be M=m·x=20-10=40 pcs. Then on one device control flow you want to put the N/m=14400/40=360 holes of diameter d=2 mm, or the density of holes on each device should be 36 resp./m

Initial oil production rate from a single capillary holes will be:

Initial oil production rate of the entire horizontal well:

Q=q·N=2,713·10-3·14286=38,8 m3/day=34,5 t/d.

After these events well put in the work. Development lead to full cost-effective production site.

As a result, development time, which has limited water production well up to 98% or achievement minimally rentabel the aqueous flow rate of oil through the borehole 0.5 t/day, was extracted from the considered horizontal wells 162,3 thousand tons of oil and 261 thousand m3water, oil recovery factor was 0,314, development time was 36 years. The prototype, ceteris paribus, were extracted 142,4 thousand tons of oil and 587 thousand m3water, oil recovery factor was 0,275, development time is 30 years. The proposed method was produced to 2.25 times less water. Increase the oil recovery factor of the proposed method was 0,039.

Example 2. Perform as example 1. Horizontal wells - existing, obwodnica to 98% in the result of the penetration of water through the cracks after 4 years of work. Conduct activities as in example 1, after which the water content of the well is reduced to 12%. Development lead to full cost-effective production site.

As a result, development time, which is limited by the flooding of the production well to 98%, or achievement of marginal oil production rate for the well of 0.5 t/d, was obtained with the considered horizontal wells 153,5 thousand tons of oil and 295 thousand m3water, oil recovery factor was 0,297, development time is 34 years. The prototype, ceteris paribus, were extracted 138,2 thousand tons of oil and 604 thousand m3water, oil recovery factor was 0,267, development time is 29 years old. The proposed method produced is 2.05 times less water. Increase the oil recovery factor of the proposed method was 0,030.

The application of the proposed method will reduce the water cut of the production of horizontal wells and, consequently, to increase the recovery factor.

The way to reduce water inflow into the horizontal wellbore fractured-porous collector, comprising determining an average distance between cracks, the separation of the horizontal wellbore section packers, downhill tubing device for controlling flow in a horizontal well bore, the selection of production from horizontal wells, characterized in that the horizontal wellbore share swollen packers into sections, with the length of each section from 20 m to 50 m depending on the distance between the cracks and the length of the horizontal wellbore, the device control flow in a horizontal wellbore is performed with the diameter d of the holes in the walls, comparable to the size of capillary tubes for the oil in this reservoir, and the holes made of a hydrophobic material, the length of each control device inflow perform in length from 5 m to 12 m and set in the amount of not more than 5 pieces in each section between the packers, the total number of holes N in the control devices of the flow around a horizontal shaft, is pressie and the diameter d of the holes is determined from the condition

where RPL- reservoir pressure, PA
PC- downhole pressure in a horizontal borehole, PA
σ is the surface tension coefficient at the boundary of selected water - surface control device inflow, PA·m,
θ is the wetting angle of water with the surface of the device control flow, degrees,
the extraction wells are subject to hydrodynamic forces generated by the downhole pressure does not exceed the capillary forces of the promotion of oil through the holes of the devices in the control flow, i.e. to the depression in the well to satisfy the relation (1).



 

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3 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed device comprises display-based visualisation unit, computer system, mechanical extraction device and downhole motor. Additionally, this device incorporates the units of downhole telemetry system connected with downhole motor. Outputs of this system are connected with the surface telemetry system connected via controller with the first visualisation unit, 1st, 2nd, 3rd, 4th and 5th processing units. Note also that outputs of [processing units are connected via computer with 2nd visualisation unit.

EFFECT: higher accuracy of evaluation owing to application of classifiers.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises construction of horizontal and/or inclined wells. Patches are applied at boundaries of zones of different permeability. Technological strings with packers are lowered to be set opposite patches to seal annular space. At a time, injection and production wells are separately operated at opening and closing of appropriate zones. Sections with shaft high watering and their hydrodynamic communication with nearby wells are defined. Technological pipe string is lowered in the well with hydrodynamic communication. Watered ground is isolated on both sides with injection of water-shutoff agent in one of the wells and intensive removal of watered fluid from wells equipped with technological pipes. At decrease in pickup and technological holding, injection of water-shutoff composition is effected in all wells equipped with technological pipes to make water-shutoff shield. Thereafter, sections processed by water-shutoff compositions in every well are tightly shutoff from inside and put in operation.

EFFECT: higher yield, lower extraction of produced water.

2 cl, 2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: set of inventions relates to production of hydrocarbons, particularly, to activation of multiple borehole devices for creation of multiple extraction zones. Method of selective activation includes several steps. At first step, combination of coded magnets is defined so that every valve sleeve in well working area includes set of magnets to be attracted to individual set of magnets at activating dart. Then, valves are opened in the selected order defined by individual dart pump feed into well shaft. Proposed mechanism comprises valve with sleeve suitable for displacement between open and normally closed positions, set of valve magnets and dart to be fed by pump in borehole shaft. Set of magnets is arranged an said sleeve. Said dart comprises set of dart magnets coupled with set of valve magnets so that said dart is connected with said valve at location there nearby while sleeve displaces from closed position to open position.

EFFECT: higher efficiency of extraction.

20 cl, 13 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: device comprises downhole electric pump with power cable, pipe string with at least one packer located in well above the pump intake module. Pipe tubing comprises bypass system composed of two opposite-flow couplings arranged upstream and downstream of said packer and pipeline between said couplings. Said couplings have eccentric channels communicating pipe tubing cavities with pump outlet and central and radial channels that make a hydraulic channel with pipeline. Hydraulic channel communicates or cuts out well above and under packer via control valve fitted in locating seat of top coupling central channel. Bypass system is equipped with electric drive of reciprocation of control valve going in the pipe tubing. In compliance with first version, said control valve is equipped with adjusting screw articulated with the nut fitted in top coupling central channel and drive by electric drive via extension coupling at engagement of coupling with drive housing via toothed cam at their end surfaces. In compliance with second version, this control valve has sliding nut with ledges fitted in top coupling central channel slots for reciprocation relative to locating seat to interact with the thread of adjusting screw fitted in thrust bearing on coupling top side.

EFFECT: comprehensive control over formation fluid withdrawal rate.

8 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: single-packer device for dual fluid production from two well reservoirs contains a centrifugal pump with a receipt module and electric drive equipped with housing and run in into the casing pipe at the flow string, a control valve which includes a sleeve for criss-cross flow of fluids connected to the casing and thus forming a chamber for mixing fluids from different well reservoirs that is communicated to eccentric channels of the sleeve from one side and to the pump receipt module at the other side and by the central channel to the upper well reservoir through radial channels of the sleeve. In the central channel of the sleeve there is a fluid flow cutter with an electric drive and an option of control from the surface location through an electric cable, and a packer. The device is equipped additionally by a control valve placed in cavity of the liner connected to the sleeve for criss-cross flow of fluids, from below the liner is coupled to a docking unit where additional control valve is installed. The docking unit is connected to the device taking fluid from the lower well reservoir equipped with the above packer. The control valves are equipped with sensor packages of control and measuring instruments and coupled to the unit of telemetry control system, the latter is installed at butt end of the pump electric derive with an option of control for the control valves from the surface location through an electric cable or automatic control from sensors measuring physical parameters of the fluids.

EFFECT: increased efficiency of well operation.

3 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method running-in and suspension of the central production string, installation of the upper part of X-mas tree, refitting of the wellhead by installation of system for monitoring and control of the well operation, performance of gas-dynamics research, flow start-up of the well through two production ring and system for monitoring and control of the well operation. At the beginning and ending of the main production string the upper and lower bits are installed respectively and a plug and a pilot-operated valve in closed position is joined to the upper and lower bits. Then the central production string is mounted to the launching and lifting gear, the master valve is closed, a radial pipe holder is installed at the master valve, an a stop valve is installed over the master valve at the pipe holder, a preventer is joined to it and a double-chamber pressuriser is installed at the preventer, an injector is connected to the upper butt end of the pressuriser and a launching and lifting mechanism is installed in direct vicinity from the well. Thereafter the central production string is passed by its end through the injector, which is used to move the central production string, the central production string is passed through the double-chamber pressuriser, pressure is supplied to its closing hydraulic cavities thus compressing packing seals of the upper and lower chamber of the double-chamber pressuriser and the central production string is sealed. Then it is run down up to the master valve level, the central production string is run down to the position when the upper bit with plug is at the level of the injector upper butt end, the rod is connected to the plug, pressure is delivered to the opening hydraulic cavity in the upper chamber of the pressuriser, in result the packing seal of the upper chamber of the double-chamber pressuriser is released, the central production string is run down to the position when the plug is below the packing seal of the upper chamber in the double-chamber pressuriser. Pressure is supplied to the closing hydraulic cavity of the upper chamber in the double-chamber pressuriser thus sealing the rod. Pressure is supplied to the opening hydraulic cavity of the lower chamber in the pressuriser, in result the packing seal of the lower chamber in the double-chamber pressuriser is released, the central production string is run down to the position when the plug is below the packing seal of the lower chamber in the double-chamber pressuriser, thereafter pressure is supplied to the closing hydraulic cavity of the lower chamber in the double-chamber pressuriser thus sealing the rod, then the central production string is passed through the preventer and the stop valve placed over the master valve until seating surface of the upper bit coincides with seating surface of the radial pipe holder of the central production string, the upper bit of the central production string is fixed in the radial pipe holder of the central production string by means of radial fixtures, then the plug is removed from the upper bit by the rod, the plug is lifted higher than the level of stop valve placed over the master valve, the above stop valve is closed and pressure is supplied to the opening hydraulic cavities in the double-chamber pressuriser, in result packing seals of the upper and lowers chambers in the pressuriser are released. Thereafter the rod with plug is removed, the BOP preventer is dismounted, the launching and lifting gear is dismounted, the upper part of X-mas tree is mounted to the stop valve placed over the master valve and the above stop valve is opened, the pilot-controlled valve is subject to external action thus fixing it in an open position, in result volumes of the main and the central production strings are united. Additionally invention claims device for method implementation.

EFFECT: reduction of labour intensity, costs and time for works performance.

2 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the field of oil and gas wells treatment. More specifically, the present invention is oriented towards development of the system and alternatives of the method to remove fluids from oil and/or gas wells. It improves efficiency of fluid extraction from the borehole and reliability of applied means. The concept of the invention is as follows: one of the inventions - the system includes a pressure pipeline, an injector valve, a pressure relief valve, a cylinder, the cylinder valve, a return pipeline valve and a return valve. The above components are installed in the underground well in order to remove at least one fluid from the well. Fluid removal from the well is controlled by regulation of gas delivery to the pressure pipeline.

EFFECT: improvement of hydrocarbon production and recovery factor from the underground strata.

10 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: hydraulic control consists of a body, at least one bypass port and at least one inlet port, inside the body there is a device with a chamber of a variable or permanent volume, a control element connected to the device with the chamber of the variable or permanent volume, a hollow element made as per a monolithic or detachable design with the body, a separating element in the body made so that it separates hermetically the bypass port or ports from the inlet port or ports thus forming an inner chamber or an inner chamber and a bypass chamber inside. At that the inlet port or ports are placed in the inner chamber, a control element can be moved hermetically inside the separating element or in a space between the side wall of the body and the separating element with potential overlapping of the bypass port or ports.

EFFECT: improving operational efficiency of the hydraulic control.

10 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to a method of well production optimisation. Intervals are selected in a deviated offshoot and drill-stem testing and borehole treatment is deployed. Then each interval is isolated in order to perform the required testing. The obtained testing data are evaluated in order to define respective recovery measures, which are implemented later by means of the drill-stem testing and borehole treatment.

EFFECT: provision of testing and treatment for the plenty of intervals in a horizontal hole during one running to the borehole.

11 cl, 6 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: to protect downhole rotary pumps from clogging with mechanical impurities, this filter comprises case with filter element and seal arranged at said case to separate filter intake part from discharge part. Said seal is composed of "an umbrella" made up of a carcass of metal spokes with oil-resistant rubber stretched there between. Device is equipped with spring, retainer and charged storage battery, its capacity being designed for lowering to preset depth to keep said umbrella at closed position.

EFFECT: higher reliability of seal and overlap of beds.

2 dwg

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