Nitrogen compressor plant to increase bed production rate (versions)

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

 

Nitrogen compressor station for enhanced oil recovery (options)

The claimed group of inventions refers to oil industry, in particular to methods of enhanced oil recovery fields using heat and gas methods at the secondary and tertiary methods of enhanced oil recovery (EOR) reservoir with low oil saturation of the reservoir.

The inventive nitrogen compressor stations can be used for the purpose of increase of oil recovery factor (CIN) low permeability and vysokotarifitsirovannyh fields, due to the production and use of nitrogen gas with high pressure and temperature.

Background art.

In Russia, as in other oil-producing countries, an increasing share of the so-called hard-to-recover reserves in low-permeability reservoirs, heavy oil, in vysokotarifitsirovannyh fields). The structure of residual oil reserves is complicated due to the intense selection of oil mainly from the active part of the reserves and incomplete replenishment of reserves balance new volumes of such high-yielding stocks.

The real extent of application of modern methods of enhanced oil recovery (EOR) is insufficient to overcome the tendency of deterioration of the structure of reserves and to provide semen�e impact on the dynamics of deterioration of the structure inventory and effective utilization of the potential recoverable oil reserves (the Concept of state governance of oil reserves". SE RVO ZARUBEZHNEFT, Moscow, 2003 ).

The efficiency of extraction of oil from oil-bearing formations of modern, commercially available methods of development in all oil-producing countries today considered unsatisfactory, while the consumption of petroleum products worldwide is growing from year to year. Average ultimate recoverable oil in various countries and regions ranging from 25 to 40%.

In the prior art discloses a method of increasing oil recovery, including use as a displacing oil agent bundles of nitrogen produced in the formation by injection of aqueous solutions of sodium nitrite and aqueous solution of ammonium salt of inorganic acid, adding hydrochloric acid, characterized in that the ammonium salt of inorganic acid is ammonium chloride or ammonium sulphate at a ratio of volume of aqueous solution of sodium nitrite and volume of an aqueous solution of ammonium chloride or ammonium sulfate 1:3, to which is added about 1,25. % hydrochloric acid, then pumped a wad of stable foam - pack of the specified nitrogen, optionally containing about 3-4. % of foaming agent is nonionic surfactant. The reaction of nitrogen excretion occurs in situ at elevated temperature. The fix is consistently: tutu nitrogen - pack foam, wad AZ�TA - a pack of foam etc (Patent RF №2236575, a Method of increasing oil recovery from low permeable formations, 2004, EV 43/00 [1]).

The disadvantage of this method [1] is a sophisticated technology of preparation of the displacing oil agent, in connection with this dramatically increases the cost price of extracted oil, which in turn leads to low profitability of this method.

Known application of the method of extraction of heavy oils in which steam is introduced in the solvent. As the solvent in the vapor with a temperature of 330-360 K (57-87°C) is injected diesel fuel in the range of 0.005 wt. %. (Patent 2117756, a Method of extracting heavy oil, 1998, EV 43/24 [2]). This method [2] has a high energy consumption for the production of steam and unsafe technology.

The closest analogue, selected as a prototype method for enhanced oil recovery, is the invention "Method of oil extraction from wells" (patent RF №2212524, 20.06.2003, EV 43/00) [3]). According to this invention, the fluid used as a carrier gas, which is pre-compressed, heated up to pressures and temperatures that are in the oil layer exceeds the critical parameters sufficient to dissolve the oil in the carrier gas.

The disadvantage of the prototype [3] is the increased intensity of the way in part of heat carrier gas.

Known mobile nitrogen compressor station (with�-in RF №114490 IPC F04B 41/00, 2011 [4]), which contains the first and second actuators, the first and second compressors, gas separation unit, liquid cooling system with fans. The first compressor includes at the output of the air cooler, the second compressor piston is made of multi-stage and contains intercooler nitrogen.

The disadvantage of this analogue of [4] is the provision of a relatively low temperature of nitrogen, sufficient to obtain the desired enhanced oil recovery of oil fields.

Also known mobile nitrogen compressor station (i.e. the Russian Federation No. 2187698 to the invention, IPC F04B 41/00, F04B 41/06, 2001 [5]). The station contains an air compressor. The last executed and multistage reciprocating. The output of the second compression stage air compressor through the condenser and water-separator is connected to the input membrane gas separation apparatus through the filter unit. The output of the gas separation apparatus is connected to the input of the third compression stage air compressor.

The specified analog [5] the inherent disadvantage of analogue [4].

Known mobile nitrogen compressor station (i.e. the Russian Federation No. 38030 utility model, the IPC F04B 41/00, 2004 [6]), which uses two small multistage reciprocating compressor and gas separation apparatus. The outputs of the third-speed compressors Conn�satisfied with the inlet gas separation apparatus, and the output of the gas separation apparatus is connected to the input of the fourth stage of the first compressor, the output of the fourth stage of the first compressor is connected to the input of the fourth stage of the second compressor. The drive of a compressor, through a mechanical clutch and drive shaft is provided by diesel car engine, the second engine of the car chassis.

The specified analog [6] the inherent disadvantage of analogue [4].

Specified mobile nitrogen station [6] is the essential signs of the closest device to the same destination to the claimed invention. So it is taken as a prototype.

Disclosure of the invention

The technical problem to be solved by the claimed invention, is to develop high-performance devices to enhance oil recovery from low permeability reservoir rocks, vysokotarifitsirovannyh fields.

The use of the claimed invention provides a high temperature and pressure guaranteed by dissolving the oil in nitrogen and then push the resulting mixture of low permeability and vysokotarifitsirovannyh layers.

The technical result provided by the claimed nitrogen compressor stations, is to increase the temperature of the nitrogen at the exit of the station and the simultaneous�elisala heat released during the operation of the station.

The essence of the claimed nitrogen compressor station according to embodiment 1 is that the station comprises a multistage piston compressor with an actuator made in the form of a diesel engine and the gas separation unit. The output of the intermediate stage of the compressor is connected to the input gas separation unit, and the output of the gas separation unit connected to the input of the compressor stage following the intermediate step. Is characterized in that the station also comprises a heat exchanger, the inlet of the working medium of which is connected to the output of the compressor. Wherein the coolant inlet of the heat exchanger is connected to the output of the exhaust gas of the diesel engine.

The essence of the claimed nitrogen compressor station according to embodiment 2 lies in that the station comprises first and second compressors, actuators each of which is made in the form of a diesel engine. The output of the first compressor is connected to the input gas separation unit, the output of the gas separation unit connected to the input of the second compressor. Is characterized in that the station also comprises a heat exchanger, the inlet of the working environment coupled to an output of the second compressor. Wherein the coolant inlet of the heat exchanger is connected to the output of the exhaust gas mentioned diesel engines.

Gatoradei�individual block stations on both options preferably made in the form of a hollow fiber membrane unit. The output of the working medium of the heat exchanger can be connected to the input of the additional heater. The yield of the additional heater is the output of the station. The inlet of the working medium of the heat exchanger is permissible to connect the output of the working medium of the heat exchanger through the first control valve and the coolant inlet of the heat exchanger is permissible to connect the output of the coolant of the heat exchanger through the second control valve.

Brief description of the drawings.

In the figures 1 and 2 shows a generalized diagram of the nitrogen compressor station according to embodiments 1 and 2, Fig. 3 - diagram for variant 1, Fig .4 - diagram for variant 2.

The implementation of inventions.

Method of enhanced oil recovery, implemented stations on both options, is as follows.

At the first stage of get air, nitrogen gas, preferably compressed to a pressure of 400 ATM. In this case, use:

- at least one compressor, a power drive which is a diesel engine;

- gas separation unit.

To extract the compressed nitrogen can be used additional compressors, drives which can be diesel engines, electric motors or other power plants.

In the second stage produces the heating of the compressed nitrogen in exhaust gases, at least one�mentioned about diesel engines.

At the third stage, if necessary, provide additional heating of nitrogen to a temperature of 180-500°C.

Then nitrogen, heated to a temperature of 180-500°C under a pressure of about 400 ATM., served in the reservoir.

Nitrogen compressor station for enhanced oil recovery according to embodiment 1 comprises a preparation unit of nitrogen (1) (Fig. 3), in turn containing a multistage piston compressor (2) and a gas separation unit (3) with hollow fiber membranes. The preparation unit of nitrogen (1) is designed to produce nitrogen from the air and its compression to a pressure of about 400 atmospheres. Power drive mentioned compressor (2) is a diesel engine (4).

The compressor (2) is designed to compress atmospheric air and feeding it to the gas separation unit (3). Gas separation unit (3) is designed for the separation of air to gas with high nitrogen content (hereinafter referred to as nitrogen) and permeate - the remaining gas with high oxygen content.

Output (11) of one of the intermediate stages of the compressor (1) connected to the input gas separation unit (3).

The output of the gas separation unit (3) connected to the input (12) of the compressor stage (1) following the above-mentioned intermediate step.

Output (13) the last compressor stage (2) the release of nitrogen preparation unit of nitrogen (1)) is connected to the input of the working environment (5) t�of ploumanach (6). Thus between the output (13) of the compressor (2) and heat exchanger (6) is not installed coolers available at the output of the known stations in its class.

The heat exchanger (6) is a device in which heat is transferred from the coolant to the working environment. In this case, the coolant is isolated from the working environment. The entrance of the coolant (7) exchanger (6) is connected to the output of the exhaust gas of the diesel engine (4). The output of the heat carrier (8) is communicated with the atmosphere.

If you do not require additional heating of the obtained nitrogen, the outlet of the working environment (9) of the heat exchanger (6) is the output of the station.

For higher temperatures, the nitrogen station than that which can be achieved by exhaust gas of the diesel engine (4) work environment (9) of the heat exchanger (6) is connected with additional heater (10). In this case, the output of this station is an auxiliary heater (10).

Station design provides obtaining at the output of nitrogen with a pressure of about 400 atmospheres. and temperature 180-500°C.

Nitrogen compressor station according to embodiment 1 operates as follows.

The input of the unit of nitrogen (1) enters the air, which is compressed by the compressor (2) and separated in a gas separation unit (3) for nitrogen and permeate. The nitrogen can then be further compressed. Then nitrogen �odetsa to the heat exchanger (6).

In the heat exchanger (6), the nitrogen is heated by exhaust gases of diesel engines (4). In the presence of the heat exchanger (6) lines of bypassing the temperature of the nitrogen at the outlet of the heat exchanger is changed by adjusting the valves.

With the optional heater (10) nitrogen from heat exchanger, optionally heated.

In the inventive station according to embodiment 1 of the claimed technical result: "reduction of energy enhanced oil recovery from low permeable layers" is due to the fact that the station comprises a multistage piston compressor with an actuator made in the form of a diesel engine and the gas separation unit. The output of the intermediate stage of the compressor is connected to the input gas separation unit, and the output of the gas separation unit connected to the input of the compressor stage following the intermediate step. Is characterized in that the station also comprises a heat exchanger, the inlet of the working medium of which is connected to the output of the compressor. Wherein the coolant inlet of the heat exchanger is connected to the output of the exhaust gas of the diesel engine. The achievement of the technical result contributes to the recovery of nitrogen from air, and utilization of exhaust heat of diesel actuator for heating of nitrogen.

Nitrogen compressor station for Bui� oil recovery according to embodiment 2 contains the block of preparation of nitrogen (1) (Fig. 4), in turn containing the first (2) and second (14) compressors and gas separation unit (3) Polo-fiber membranes. The preparation unit of nitrogen (1) is designed to produce nitrogen from the air and its compression to a pressure of about 400 atmospheres. Power drive the first compressor (2) is a diesel engine (4), and a power drive of the second compressor (14) is a diesel engine (15).

The first compressor (2) is designed to compress atmospheric air and feeding it to the gas separation unit (3). Therefore, the output of the first compressor

(2) is connected with inlet gas separation unit (3). Gas separation unit

(3) is designed for the separation of air to gas with high nitrogen content (hereinafter referred to as nitrogen) and permeate - the remaining gas with high oxygen content.

The output of the gas separation unit (3) (it is the exit of nitrogen preparation unit of nitrogen (1)) is connected to the input of the second compressor (14). The output of the second compressor (14) is connected to the input of the working environment (5) of the heat exchanger (6). Thus between the output of the second compressor (14) and heat exchanger (6) is not installed coolers available at the output of the known stations in its class.

The heat exchanger (6) is a device in which heat is transferred from the coolant to the working environment. In this case, the coolant is isolated from the working environment. With the entrance�m Talagante (7) exchanger (6) connected to the outputs of both exhaust of diesel engines (4, 15). The output of the heat carrier (8) is communicated with the atmosphere.

If you do not require additional heating of the obtained nitrogen, the outlet of the working environment (9) of the heat exchanger (6) is the output of the station.

For higher temperatures, the nitrogen station than that which can be achieved by exhaust gas of the diesel engine (4) work environment (9) of the heat exchanger (6) is connected with additional heater (10). In this case, the output of this station is an auxiliary heater (10).

Station design provides obtaining at the output of nitrogen with a pressure of about 400 ATM and a temperature of 180-500°C.

For the purpose of controlling the temperature of the nitrogen at the exit of the station inputs and outputs of the heat exchanger (6) is covered by two lines of bypassing paths, respectively, of the working environment and Talagante. Wherein the inlet of the working medium (5) is connected to the output of the working environment (9) through the first control valve (16) and the entrance of Talagante (7) is connected to the output of Talagante (8) via a second control valve (17). The first (16) and second (17) control valves can be connected to the automation system.

Nitrogen compressor station according to embodiment 2 operates as follows.

The input of the unit of nitrogen (1) enters the air, which is compressed by the compressor (2) and separated in a gas separation unit (3) for nitrogen and PE�meat. The nitrogen can then be further compressed. Then, nitrogen is supplied to the heat exchanger (6).

In the heat exchanger (6), the nitrogen is heated by exhaust gases of diesel engines (4). In the presence of the heat exchanger (6) lines of bypassing the temperature of the nitrogen at the outlet of the heat exchanger is changed by adjusting the valves.

With the optional heater (10) nitrogen from heat exchanger, optionally heated.

In the inventive station according to embodiment 2 of the claimed technical result: "reduction of energy enhanced oil recovery from low permeable layers" is due to the fact that the station includes first and second compressors, actuators each of which is made in the form of a diesel engine. The output of the first compressor is connected to the input gas separation unit, the output of the gas separation unit connected to the input of the second compressor. Is characterized in that the station also comprises a heat exchanger, the inlet of the working environment coupled to an output of the second compressor. Wherein the coolant inlet of the heat exchanger is connected to the output of the exhaust gas mentioned diesel engines. The achievement of the technical result contributes to the recovery of nitrogen from air, and utilization of exhaust heat of diesel actuator for heating of nitrogen.

Industrial approx�nimoth

The inventive nitrogen compressor stations for enhanced oil recovery can be realized with the present development of the art and is effectively used in industries, the oil industry, in particular for enhanced oil recovery fields using heat and gas methods at the secondary and tertiary methods of enhanced oil recovery (EOR) reservoir with low oil saturation of the reservoir, with the aim of raising the oil recovery factor (CIN) low permeability and vysokotarifitsirovannyh fields.

SOURCES of INFORMATION

1. RF patent №2236575, a Method of increasing oil recovery from low permeable formations, 2004, EV 43/00.

2. Patent 2117756, a Method of extracting heavy oil, 1998, EV 43/24.

3. RF patent №2212524, "Method of extracting oil from wells, 20.06.2003, EV 43/00.

4. RF patent №114490 for useful model "Mobile nitrogen compressor station", IPC F04B 41/00, 2011.

5. RF patent №2187698 to the invention, the Mobile nitrogen compressor station, IPC F04B 41/00, F04B 41/06, 2001.

6. Patent RF No. 38030 useful model, Mobile nitrogen compressor station, IPC F04B 41/00, 2004.

1. Nitrogen compressor station containing a multi-stage piston compressor with an actuator made in the form of a diesel engine and the gas separation unit, wherein the output of the intermediate stage type compressor�and connected to the input gas separation unit, and the output of the gas separation unit connected to the input of the compressor stage to the next intermediate step, wherein the station also comprises a heat exchanger, the inlet of the working medium of which is connected to the output of the compressor, wherein the coolant inlet of the heat exchanger is connected to the output of the exhaust gas of the diesel engine.

2. Nitrogen compressor station according to claim 1, characterized in that the gas separation unit is made in the form of a hollow fiber membrane unit.

3. Nitrogen compressor station according to claim 1, characterized in that the outlet of the working medium of the heat exchanger is connected to the input of the additional heater, the auxiliary heater is the output of the station.

4. Nitrogen compressor station according to claim 1, characterized in that the inlet of the working medium of the heat exchanger is connected to the output of the working medium of the heat exchanger through the first control valve and the coolant inlet of the heat exchanger connected to the coolant outlet of the heat exchanger through the second control valve.

5. Nitrogen compressor station containing the first and second compressors, actuators each of which is made in the form of a diesel engine, wherein the outlet of the first compressor is connected to the input gas separation unit, the output of the gas separation unit connected to the input of the second comp�of essor, wherein the station also comprises a heat exchanger, the inlet of the working environment coupled to an output of the second compressor, wherein the coolant inlet of the heat exchanger is connected to the output of the exhaust gas mentioned diesel engines.

6. Nitrogen compressor station according to claim 5, characterized in that the gas separation unit is made in the form of a hollow fiber membrane unit.

7. Nitrogen compressor station according to claim 5, characterized in that the outlet of the working medium of the heat exchanger is connected to the input of the additional heater, the auxiliary heater is the output of the station.

8. Nitrogen compressor station according to claim 5, characterized in that the inlet of the working medium of the heat exchanger is connected to the output of the working medium of the heat exchanger through the first control valve and the coolant inlet of the heat exchanger connected to the coolant outlet of the heat exchanger through the second control valve.



 

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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: according to the method in a watered part of a formation at first remedial cementing is made to cut the inflow of stratal water off and to isolate the watered part of the formation by a cement plug setting. A geophysical survey is performed in the non-watered part of the formation. Intervals are identified with bigger permeability of the productive formation areas. An assembly with an end-to-end channel is run in at the drill string and set by means of an anchor packer device. It is oriented towards one of the permeable areas of the productive formation. Mill equipment with a downhole drilling motor, flexible shaft and cutter is run in to the well at a flexible tube. An opening is cut in the production string wall with the use of an oil-based solution. The mill equipment is run out from the well. A jet nozzle is run in to the well up to a discharge outlet of the guide assembly. Cement stone and rock is washed out behind the production string so that a radial borehole is formed. The radial borehole treatment is made through the jet nozzle by an acid composition so that a cavern is formed. The flexible pipe with the jet nozzle is lifted out of the well. The guide assembly is rotated, for example, per 180 degrees and similar operations are performed to tunnel the next radial borehole. The guide assembly is lifted to the height of the next interval in the permeable areas of the productive formation and the similar operations are performed to tunnel the next radial boreholes. Up to the upper radial boreholes of the well an oil string is run in and the above string is made of tubing strings with the area of a clearance hole equal to the sum of all the clearance holes in the radial boreholes. The well is brought to operation.

EFFECT: improved efficiency of the method due to the removal of conditions for swelling of clays contained in the productive formation at tunnelling the radial borehole in low-permeable terrigenous deposits of water-swelling clays.

3 ex, 6 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.

EFFECT: higher efficiency, higher safety.

2 cl

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