Method of gas-lift oil extraction using energy of associated gas combustion in well

FIELD: oil and gas industry.

SUBSTANCE: method lies in accumulation of liquid and gas in a well, cyclic carryover of accumulated liquid from the liner to tubing string and throwing of liquid column by gas. According to the invention associated gas is separated from liquid-gas mixture and directed to the upper part of gas-lift unit to gas burning unit. Air under high pressure is fed to the same unit in order to provide conditions for gas-air mix burning ensuring high-speed burning process accompanied by sharp increase of temperature and pressure. In result it provides opening of return valve in the lower part of tubing string and throwing of liquid column by gas being a combustion product. Thereafter cycle of gas separation from liquid-gas mixture and its burning in gas-air mix is repeated as far as liquid and gas enter through the service valve from annular space to the lower part of submerged gas-lift unit at receipt of a signal from the earth control station.

EFFECT: increase in efficiency, reduction of power consumption, control of production process and reduction of costs for well operation.

1 dwg

 

The invention relates to the oil and gas industry and can be used in the development of fields with the use of gas-lift methods well operations.

Lifting fluids from oil wells with gas lift is accomplished through the use of energy injected into the gas or gas from the reservoir - associated petroleum gas (APG). The advantages of this method lie in the possibilities of wells with large gas factor in small influence on the process of production of mechanical impurities, temperature, pressure, ability to flexibly regulate the operation of wells, ease of maintenance and repair of gas-lift wells.

The known method of gas-lift oil with automatic control of the production capacities of wells, including placing on the column tubing (tubing) nipple - funnel, borehole cameras with valves and pressure regulators of both oil and gotoododa wells, with nipple - hole in the column tubing gotoododa well equipped with gas pressure regulator, maintaining constant pressure behind it and across the gas supply system, which is done with equal diameters to the point of gas injection into an oil well. Working gas-lift valve is set so that it opens and perepuskat through a gas only when the preset pressure of the liquid column at the point of installation, but less than the pressure of the gas at the same point in the annular space of the borehole (EN 2000110459, publ. 10.02.2002,).

The disadvantage of this method is the need for training and ground control working agent (gas), which requires expensive tools in the field.

The known method of gas-lift well operation (patent RF №2239696, IPC EV 43/00, publ. 10.11.2004,), consisting in the accumulation of fluid and gas in the well and the ejection of the liquid column gas, and when the drop in the value of hydrostatic pressure up to the specified minimum limit block the flow of gas-liquid mixture and the gas in the column lifting pipe at the depth of installation work gas-lift valve, perform a circular bypass accumulating in the well fluid from the shank in the upper part of the column lifting pipes, and at the time of accumulation of the liquid column of a given height are applying the operating agent in the lower part of the internal cavity of the column lifting pipes, and cyclic bypass accumulate in the borehole fluid is carried out within the minimum and maximum pressure difference between the gas pressure in the annular space of the well and the pressure of the gas-liquid mixture in the upper part of the shank, and the gas in the column lifting pipes operate at the lower limit of the given differential on the areas between the gas pressure in the annular space of the well and the hydrostatic pressure of the liquid column in the column lifting pipes.

The disadvantage of this method is the presence of mechanical actuators that are detrimental to reliability, as well as the inability of changes in operation modes that depend on the reservoir pressure and gas flow.

The objective of the proposed invention is the creation of an effective and reliable method of lifting fluid from a well.

The technical result of the use of the invention is to improve performance, reduce energy consumption, reduce operating costs of the well and providing the management of the production process.

The invention consists in the achievement of the technical result in the way of gas-lift oil from the well, in which the accumulation of fluid and gas in the well, a cyclic bypass accumulated liquid from the shank in the upper part of the tubing and the release of a column of liquid working medium gas. Unlike the prototype isolate of associated petroleum gas from the gas-liquid mixture flowing through the working valve at the bottom gas-lift submersible installation, and sent to the upper part of the submersible gas lift installation, the device of the combustion gas, which also serves high pressure air to the combustion gas sm is si, and carry out the ignition of the gas mixture, providing high-speed combustion, which is accompanied by a sharp rise in temperature and pressure, resulting ensure the opening of the check valve in the lower part of the tubing and the ejection of the liquid column gas product of combustion, after this cycle branch of associated petroleum gas from the gas-liquid mixture and its combustion in the gas mixture is repeated upon receipt through the working valve and liquid petroleum gas from the annular space of wells in the lower part of the submersible gas-lift installation according to the signal ground control station.

The invention is illustrated in the drawing, which shows a schematic diagram of gas-lift installations, mounted on the lower part of the tubing located in the casing string.

Gas-lift installation for implementing the method includes a housing 1 in the form of a sealed tube, in the lower part of which is a base 2 with a work valve 3, which transmits downhole gas-liquid mixture inside the enclosure. In the upper; part of the unit contains the clutch 4, with non-return valve 5 connecting the chassis 1 with the tubing 6. Inside in the upper part of the device of the combustion gas, comprising a chamber 7, the spark plug 8 and the nozzle air supply (oxidize the I) 9, and in the lower part of the body has the degassing device 10 with the blade of a screw device 11. Under the base of the housing 1 has a high voltage source 12, the motor 13 of the degassing device.

Ground equipment for gas-lift installation includes a compressor 14 and high pressure, the control station 15, the transformer 16. From the compressor the air under pressure supplied through the steel tube 17 to the nozzle 9 of the device of the combustion gas. The high voltage cable 18, the voltage from source 12 is fed to the spark plug 8. Power cable 19 passes along the tubing and serves to supply power from the transformer 16 to the motor of the degassing device 13. Gas-lift installation lowered into the well and is located in the lower part of the casing 20.

The oil extraction method using petroleum gas and gas-lift installation is as follows.

Lowered into the well on tubing 6 gas-lift installation is filled downhole gas-liquid mixture containing APG, through the working valve 3. The control station 15 includes a motor 13 of the degassing device, which provides start-bladed screw device 11. Separated from the gas-liquid mixture APG begins to fill the chamber 7 device flaring. When filling the chamber includes a compressor 14, high pressure and pumped through the met is Lucescu tube 17 and the nozzle 9, the air in the chamber 7 for the formation of gas-air mixture combustion. At this point the signal from the control station 15 includes a high voltage source 12, which applies a voltage to the spark plug 8 devices combustion gas, which results in the ignition and is a high-speed combustion gas-air mixture, thus dramatically increasing the temperature up to 1500-2000°C and a pressure of 200 atm or more. This work closes the valve 3 and opens the check valve 5, through which the combustion product gas with low oxygen flows into the tubing and up. Mingling in the tubing with fluid, it reduces its density and creates a gas-lift effect. Thus, all the energy of combustion of APG is spent on lifting fluid from a well. Then the cycle repeats. Time and the lifting speed is regulated with the control station 15 depending on debit wells, the oil content of the formation.

The proposed method of oil production due to the combustion of APG provides the most effective use and at the same time solves the problem of its utilization. The advantages of this method are as follows.

1. Associated gas is separated from the gas-liquid mixture in the well and is burned in the borehole;

2. The energy of combustion of APG is spent on lifting, without intermediate links of energy expenditure;

3. Provided unlimited possibilities the particular regulation of the rate of climb, accordingly, performance, installation, flexible regulation of the operation of wells;

4. Requires low energy consumption, because energy is expended only for the ignition system, the separation of gas from oil (gas separation and injection of air from the surface;

5. Allows selection of large volumes of liquids;

6. Is operated wells with a large gas factor;

7. There are no complicated mechanisms and friction components;

8. Little effect profile of the wellbore performance;

9. Small influence of mechanical impurities, temperature, pressure;

10. Long overhaul period of the wells;

11. Easy maintenance and repair of wells;

12. There are no initial capital investment in the construction of compressor stations;

13. Not form stable emulsions in the process of raising production wells;

14. There are no acquisition costs operating agent gas.

The method of gas-lift oil from a well, which consists in the accumulation of fluid and gas in the borehole, cyclic bypass accumulated liquid from the shank in the pump tubing and the ejection of the liquid column gas, characterized in that the separated gas from the gas-liquid mixture flowing through the working valve in the lower part of the immersion gaslift the th installation and sent to the upper part of the gas-lift submersible installation in a device of the combustion gas, which also serves high pressure air for the combustion of the gas mixture, and carry out the ignition of the gas mixture, providing high-speed combustion, which is accompanied by a sharp rise in temperature and pressure, resulting ensure the opening of the check valve in the lower part of the tubing and the ejection of the liquid column gas product of combustion, then the cycle of separation of gas from the gas-liquid mixture and its combustion in the gas mixture is repeated upon receipt through the working valve liquid and gas from the annular space of wells in the lower part submersible gas-lift installation according to the signal ground control station.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: heat is supplied to the first part of subsurface formation, at that at least two heaters are located in heating wells in the above first part; fluids are extracted from one or more production wells in the second part of the formation, at that this part adjoins at least partially the above first part; heat supply is reduced or stopped to the first part when the preset time is over; then oxidising fluid is fed through one or more heating wells in the first part; heat is supplied to the first and second parts in result of oxidisation of at least some amount of hydrocarbons in the first part and movement of fluids heated in result of such oxidisation from the first part to the second one; fluids are withdrawn from at least one production well in the second part, at that produced fluids contain at least some quantity of oxidised hydrocarbons formed in the first part meanwhile high pressure is maintained in the heated part of the formation: at which the added formation fluid has minimum number of compounds with carbon number value more than 8 to provide conditions of pyrolysis of polynuclear hydrocarbon compounds and their quality control as well as prevention of formation falling in the course of its thermal treatment.

EFFECT: increasing efficiency of hydrocarbon production from subsurface formations.

41 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of development for ultraviscous oil deposits with thermal influence involves drilling of horizontal injection and recovery wells one below the other, at that horizontal injection well is located higher than horizontal injection recovery well, and also rows of vertical injection and recovery wells; pumping of heat carrier into injection wells and production of ultraviscous oil from recovery wells. The row of vertical injection wells is drilled over the horizontal injection well till they are crossed with it. Recovery wells are inclined and located in two rows at different sides from horizontal wells; they are drilled till crossing with horizontal recovery well. Then hydraulic fracturing is made from the horizontal injection well opposite each vertical injection well with formation of hydrodynamic links. In similar way hydraulic fracturing of stratum is made from the horizontal recovery well opposite each inclined recovery well with formation of hydrodynamic links. Heat carrier is pumped into the horizontal injection well and vertical injection wells and recovery of ultraviscous oil is made through the horizontal recovery well and inclined recovery wells till drowning of the horizontal recovery well; whereupon bores of the inclined recovery wells are isolated from hydrodynamic link with the horizontal recovery well and the horizontal recovery well is converted into an inspection well. Further pumping of heat carrier is made in turn to injection wells and to the horizontal injection well while recovery of ultraviscous oil is made from inclined recovery wells till bores of the inclined recovery wells are drowned from the horizontal injection well. Whereupon pumping of heat carrier to the horizontal injection well is stopped and this well is converted into a process well; further heat carrier pumping is made only to the vertical injection wells while recovery is continued from the inclined recovery wells; at that water is pumped periodically into the process well in order to decrease temperature till the permitted value within the area of potential breakthrough of heat carrier to the inclined recovery wells.

EFFECT: additional involvement into deposit development of areas with ultraviscous oil with layer inhomogenity which are located directly over horizontal wells with controllability of temperature of ultraviscous oil soaking and decrease of this temperature; prevention of heat carrier breakthrough to bores of recovery wells in process of the deposit development; prevention of necessity to convert injection wells into recovery wells and vice a versa thus reducing financial expenses of the method implementation.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: in the method of development for high-viscosity oil deposit that includes stages of steam injection into injection well, productive stratum heating with creation of steam pocket, oil recovery through recovery well, pumping of produced water to injection well when project value of residual oil saturation is reached and steam injection is cancelled concentration of hydrocarbonate-ions is determined in produced water. Produced water with concentration of hydrocarbonate-ions of at least 3 g/l is subject to pumping into wells. When concentration of hydrocarbonate-is less than 3 g/l at temperature more than 100°C in a steam pocket carbamide is added into produced water. When temperature in the steam pocket drops below 100°C sodium, ammonium or potassium carbonate is added into produced water and these substances decompose with release of carbon dioxide gas under effect of heat accumulated in the steam pocket.

EFFECT: increase in efficiency of thermal-steam treatment during recovery of residual oil due to use of heat accumulated in the steam pocket when steam injection is terminated.

2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: in development method of a high-viscosity oil or bitumen deposit with horizontal wells, which involves drilling of parallel production wells and double-head horizontal wells located above them with arrangement in plan view between production wells, reinforcement of wells with casing strings with secondary drilling of the formation in production wells, pumping of steam or steam-gas mixture to double-head wells and extraction of the product from production wells, in double-head wells there arranged are non-perforated casing strings; at that, double-head wells are connected in series to each other by means of heat-insulated pipelines so that they form a single heating element. Steam or steam-gas mixture is pumped in series through all double-head wells without being released from the casing string to the formation. At that, continuous measurement of temperature of steam or steam-gas mixture is performed at the outlet and the outlet of each double-head horizontal well. When steam or steam-gas mixture temperature is decreased by more than 5-7% of the initial one in rupture of the single heating element there installed is an additional pumping heating station to maintain the temperature and pressure of pumped steam of steam-gas mixture.

EFFECT: increasing high-viscosity oil or bitumen extraction efficiency owing to stable and continuous thermal action on the productive formation, and owing to excluding produced water and condensate in the volume of extracted product; improving environmental situation owing to excluding the possibility of steam penetration via the formation to the surface; reducing material and technical costs.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of a fractured high-viscosity oil deposit involves drilling of vertical injection and branched horizontal production wells with horizontal shafts, pumping of a displacement fluid through vertical injection wells and extraction of the product through branched horizontal production wells. Vertical injection wells are drilled in a vorder zone of the deposit. Branches of horizontal shafts of production wells are drilled in an oil-bearing zone of the deposit with a stepped section. Number of branches corresponds to number of interlayers differing from each other with permeabilities by 1.5 and more times. Length of each branch is determined by means of a calculation depending on the formation permeability and length of the main horizontal shaft. Development of the deposit is performed at the formation pressure that is higher than saturation pressure of oil with gas and lower than pressure for fracture opening in the deposit by pumping to injection wells of a displacement agent (gas). Bottom-hole zones of production wells are periodically subject to steam treatment, when temperature of the extracted product is decreased to the temperature, below which abrupt increase in oil viscosity begins.

EFFECT: absence of breaks of displacement agent in fractures; performance of branched shafts from a horizontal well of optimum length; uniform displacement of the extracted product; increase in the deposit oil recovery.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: in the development method of high-viscosity oil and bitumen deposit, which involves drilling of injection and production wells, heat carrier pumping through injection wells and extraction of the product through production wells, one pair of inclined production wells of similar length is drilled in parallel vertical planes with the distance of not less than 10 m between them and at an angle of 30-35° to the formation bottom towards each other. Then, three vertical injection wells are drilled symmetrically between them; at that, one of them is arranged in the middle of length of inclined production wells projected to a horizontal surface, and two others are arranged at equal distance to the right and to the left of it. Pumping of heat carrier to vertical injection wells is alternated with pumping of a hydrocarbon solvent. Heat carrier pumping cycle is performed till oil and bitumen viscosity in the productive formation is decreased to the value providing dilution of oil and bitumen in a chamber-solvent at further pumping of a hydrocarbon solvent, which is continued till maximum viscosity value of oil and bitumen, which provides dilution of oil and bitumen with the hydrocarbon solvent, is achieved; after that, pumping of hydrocarbon solvent to vertical injection wells are stopped and pumping of heat carrier is renewed to them. Oil and bitumen extraction from inclined production wells is performed constantly.

EFFECT: increasing displacement coefficient of high-viscosity oil and bitumen, and increasing the coverage of the formation with heat action both horizontally and vertically.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of heavy oil or bitumen mine field with control of heat carrier pumped to the well involves construction of upper injection well and lower production well with horizontal sections located one above another, pumping of heat carrier through horizontal injection well with warming-up of formation, development of a steam chamber and extraction of product through horizontal production well, picking-up of thermogramme of steam chamber, analysis of the warming state for uniform warming-up and availability of thermal spikes, and considering the obtained thermogrammes, uniform warming-up of steam chamber is performed by changing warming-up zones. During construction of wells, their horizontal sections are equipped with filters dividing those sections into zones. On the string head for pumping of heat carrier, each of those is equipped with independent pipelines. Two parallel pipe strings, each of which is equipped with a bottom-hole flow pulsator are lowered to an injection well; at that, outlet holes of pipe strings are arranged in the filter in initial and end zones of the horizontal section of the injection well and separated from each other with a packer, and on the head of the injection well, pipe strings are connected via independent pipelines to a flow switch providing heat carrier pumping simultaneously to both pipe strings or to one of the pipe strings depending on the steam chamber thermogramme picked up in the production well; heat carrier breakthrough from the steam chamber to the production well through a more heated zone is excluded by pulsating pumping of heat carrier between initial and end zones of the horizontal section of the injection well.

EFFECT: control of heat carrier pumping to a productive formation, reduction of the time required for heating of a steam chamber, improvement of operating efficiency of the steam chamber, provision of uniform and full development of heavy oil or bitumen resource in a non-homogeneous manifold of productive formation, and excluding heat carrier breakthrough to a horizontal section of the production well.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: device for development of an oil or bitumen high-viscosity deposit involves (within a deposit) a two-head well with a horizontal section cased with a production string with a filter on both ends, and an additional shaft fixed with an additional production string with a filter, a pump for extraction of the well product, which is lowered on a process pipe string through the first head of the well, and a process pipe string for injection of heat carrier, which is lowered through the second head of the well. The filter in the additional production string of the additional horizontal shaft is arranged under the filter of the production string of horizontal section of the two-head well at the distance excluding the heat carrier breakthrough. In the production string, on the side of the additional horizontal shaft before the filter there installed is a blind packer, and the pump is arranged in the two-head well on the side of the first head interconnected with the additional horizontal section. On the side of the second head, two process pipe strings with packers on the end are lowered and arranged concentrically; the packers are set in a non-perforated section of the filter of the production string at the boundary of the deposit zones differing with permeabilities by two and more times. The filter of the production string is separated with packers of the process pipe strings into zones with high and low permeabilities. On the second head of the two-head well, each process pipe string is equipped with a pair of valves connected with injection lines with a steam generator plant and a pumping unit. The injection line connected to the process pipe string supplying the heat carrier to the high-permeability zone is equipped with a nozzle.

EFFECT: extension of the deposit development till breakthrough of heat carrier at the pump inlet, uniform pumping of heat carrier throughout the filter length depending on the deposit permeability and pressure of intake capacity of the pumping zones, increase in extraction efficiency of heated high-viscosity oil or bitumen, and isolation of the deposit section at heat carrier breakthrough.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves formation of a dissociation zone in the form of a sand glass in an underground deposit containing hydrocarbons; capture of used heat and its transfer to the fluid for cretin of a heated fluid; transportation of heated fluid to the underground hydrate deposit containing hydrocarbons and transfer of heat to hydrates contained in the deposit, thus causing their dissociation to natural gas and water; and transportation of dissociated natural gas and water to manufacturing facilities, where natural gas will be subject to processing.

EFFECT: increasing hydrocarbon extraction efficiency.

18 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: in the course of deposit development there drilled are horizontal production and injection wells by pairs parallel to each other one above the other, heat-transfer medium is pumped through injection wells and the product is extracted through production wells. Prior to drilling the pairs of horizontal wells, along the future horizontal bores there drilled are vertical exploratory bores alternatively from one and the other side at a distance of 10-30 m from future trajectory of horizontal bores with the distance between vertical exploratory bores 80-120 m. The profile of production oil horizon bedding and the profile of water-oil contact are defined by exploratory bores. Vertical exploratory bores are eliminated. The bottom horizontal bore of production well is drilled under water-oil contact. At the deposit there marked are the following horizontal bores of production and injection wells mainly parallel to the drilled horizontal bores. In the course of drilling of the next horizontal bores there performed are operations like drilling the first bores with location of the following bores mainly in parallel at the distance of 80-120 m from the drilled horizontal bores.

EFFECT: increasing oil recovery of deposit.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method consists in movement of a housing of a continuous circulation tool to an adapter having a channel passing through it and intended for connection in a pipe string in the well and selective movement of drilling fluid between the housing and a side hole in the adapter; in addition, the continuous circulation tool includes a shutoff device, and actuation of a shutoff mechanism to introduce a shutoff element of the shutoff device through the side hole in the adapter for insulation of drilling fluid flow through at least one section of the channel. A system for carrying out well operations with continuous circulation of drilling fluid, which contains a continuous circulation tool interconnected with a tubular column of the well, which contains an adapter and is intended for selective shutoff of the drilling fluid flow to tubular column of the well, a pipe manipulating device near the adapter, which contains the following: a pipe wrench, pipe wrenches, a pipe wrench, a retaining wrench, a pipe wrench and a spinning wrench and a device for mechanised suspension and unscrewing of pipes.

EFFECT: maximum drilling speed.

34 cl, 27 dwg

FIELD: oil and gas industry.

SUBSTANCE: system and method for increasing a well flow rate are described in the application. The system includes processor (150) that processes commands contained in a software, which include command for monitoring during the specified period of time of an actual fluid flow rate from each productive zone (52B, 52b) of the well in compliance with the first tuning of devices for control of the flow rate and applying the analysis of the chain using a method of node potentials to a variety of input data chosen from the data of well sensors, data of surface sensors, one or more current positions of devices, for the purpose of setting one or more new settings, at which increase in the well flow rate will be provided.

EFFECT: increasing productive capacity of well.

18 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: system includes several tubular elements located in each other with the channels directing the fluid flows from different formations of the well to different channels of tubular elements fixed in the casing pipe by means of packers. Channels are equipped with spool-type gates with control electric drives providing separate movement of fluid flows from different formations through different channels by means of a processor and a fluid parameter measurement sensor installed in each channel and functionally connected to the automatic control processor of the valve in compliance with the information received from the sensor, and further selective mixing of flows in the area of the casing pipe. Tubular elements are fixed in the casing pipe with upper packer, and at their inlets, they are connected to the coupling directing different flows via different channels from different formations, which is connected via a central channel by means of the shank to the extracting device of the product from bottom formation of the well, which is fixed in the casing pipe with lower packer. Unit of separate supply and accounting is connected via a branch pipe to the electric drive of the submersible centrifugal pump, in which a communication cable is placed to control the valves from the electric feed and control cable, which attaches the pump electric drive to the well electric feed and control station.

EFFECT: increasing operating efficiency of the well formations.

3 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes blocking of a perforation interval by means of injection of a blocking liquid and its pushing with a killing fluid to a bottomhole and to a bottomhole area of a bed with simultaneous monitoring of pressure at a well head, gas relief and process settling. At the same time, prior to injection of the blocking fluid, a sand screen is formed by injection of a pulp of quartz sand with fraction of 0.6-1.2 mm in a carrier fluid in two portions with a flow rate of a carrier fluid, the value of which does not exceed the maximum permissible value, defined according to the formula. At the same time the volume of the quartz sand in the first portion of the pulp is calculated in accordance with the formula with further process settling of the well for the time determined according to the formula after injection of the first pulp portion. The volume of the quartz sand in the second pulp portion is taken as equal to the volume of suffosion channels produced in the sand screen. The blocking fluid is a certain composition. The blocking fluid volume is previously calculated according to the formula. Besides, at the moment of completion of blocking fluid pushing, hydrodynamic pressure is determined in a tubing string. Afterwards the process settling of the well is carried out. Further injection of the killing fluid into the well is carried out along the tubing string until it appears at the well head. At the same time the well head pressure is controlled in the annular space of the well by means of gas and blocking fluid relief, providing for pressure at the inlet to the tubing string as permanent and equal to the predetermined hydrodynamic pressure.

EFFECT: improved efficiency of gas well killing.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: design of low-angle and horizontal wells includes a technical string, an operating string and a lift string. The operating string is cemented above the productive formation roof. The operating string in the productive formation is divided into sections with casing packers, and sections include filter sections and sections of solid pipes. The lift string in the productive formation is equipped with operating packers, installed inside the sections of solid pipes of the operating string and groups of controlled valves equipped with calibrated inlet side holes arranged inside filter sections. A seat nipple is installed at the end of the lift string. Controlled valves and the nipple are made as capable of interaction with control devices lowered inside a lift string.

EFFECT: possibility to control an inflow from isolated sections of a low-angle or horizontal well shaft or their total selective water isolation.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of heavy oil or bitumen deposit with control of well product extraction involves construction of upper injection and lower production wells with horizontal sections located one above another. At construction of wells their horizontal sections are equipped with filters installed opposite productive formation zones. Inside filter with non-perforated interval in production well there arranged is a shank provided with inlet holes dividing the filter into extraction zones. Besides, shank is equipped on the inner side with a stock with side channels. Inner space of stock is interconnected with inlet of pump lowered to production well on the tubing string with possibility of longitudinal movement of the tubing string together with pump and stock in the shank. Heat carrier is pumped through horizontal injection well with warming-up of the formation by creating the steam chamber, and product is extracted through horizontal production well. Thermograms of steam chamber are taken, the chamber's warm-up state is analysed for uniform heating and available temperature peaks, and considering the obtained thermograms, uniform heating of steam chamber is performed. Before the tubing is lowered to production well, first, stock is lowered with a shank concentrically arranged on it and fixed in transport position with a shear screw. Besides, on the outer side of the shank lower end there installed is heat-resistant packer; after the stock is lowered to production well, lower end of tubing is put on its upper end. Tubing is equipped with a pump. Tubing is lowered to production well till the packer is arranged at non-perforated interval of production well filter; after that, packer is installed by dividing the filter of production well into two extraction zones - initial and final. Uniform heating of steam chamber is performed by supplying the heat carrier through injection well. Penetration of heat carrier and/or formation water to the pump inlet is avoided by controlling the product extraction to the pump inlet from the initial extraction zone. Besides, product extraction volume is reduced in the initial extraction zone where temperature peaks occur. For that purpose, inlet shank holes corresponding to the initial extraction zone are made with reduction of carrying capacity from face to head, and side channels of stock are provided with possibility of alternating interaction with one of inlet shank hole in the initial extraction zone. This is performed by restricted longitudinal movement of pipe string together with pump and stock relative to shank by increasing or reducing the number of connection pipes on upper end of pipe string depending on the distance between inlet holes of the shank. Pipe string is fixed on the head of production well in the required position by means of a face plate on a supporting flange, and shank hole corresponding to the final extraction zone is made in the form of an open stock end.

EFFECT: improving the control of product extraction volume from extraction zones; simpler erection and lower metal consumption on the design.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of fluid extraction from the well is performed in the following way: the first adjustment at least of the first well equipment for fluid production is performed; the first set of input parameters is chosen, which includes at least one parameter referring to serviceability degree at least of one second well equipment and sets of parameters chosen from the group including the data referring to efficiency, pressure, temperature, presence of the chosen reagent, content of water, content of sand and flow rate of injected chemical reagents. The first set of parameters is used to be entered to the computer model, and the second adjustment at least of one first well equipment is performed, which will provide at least extension at least of one second well equipment or increase in completed well flow rate. Also, control system of operation of electric submersible pump is proposed, which contains information storage data base relating to operating range of submersible pump, and processor for adjustment at least of one first well equipment, which has the possibility of using at least one measured operating parameter of submersible pump and information stored in the data base.

EFFECT: invention allows performing the monitoring of well shaft state and serviceability degree of various equipment and taking actions, which will provide increased or optimum production of hydrocarbons from the well.

25 cl, 4 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to production of natural gas ad may be used in methane-coal well development. Proposed method comprises perforation of operation string in interval of production bed and its hydraulic fracturing. Thereafter, operation string is flushed. Settled fluid level allows defining initial counter pressure on productive coal bed. Production tubing with borehole pump is lowered into flow tubing, the pump being located under perforation interval. Well head is sealed. Borehole pump is used to reduce fluid level in well annuity space to below perforation interval together with injection of buffer gas therein at initial counter pressure on the bed. Thereafter, feed of buffer gas is interrupted. Said fluid level in annuity space is maintained by means of borehole pump. Inflow of bed fluid is caused by releasing excess pressure of buffer gas from annuity space in control over variation in gas quantitative and/or qualitative composition at well head. Change in released buffer gas composition allows defining the beginning of coal methane from productive bed. Now, rate of buffer gas pressure release is decreased.

EFFECT: higher efficiency of well development.

4 cl

FIELD: oil and gas production.

SUBSTANCE: proposed method consists in using tubing incorporating borehole pump and packer. Note here that borehole pump is equipped with check valve. Check valve is arranged close to and above the pump on tubing outer side to allow one-way fluid flow from tubing into tube space. Said tube space is filled with process fluid with corrosion inhibitor in required concentration. Pressure in tube space is maintained not exceeding tolerable magnitude by means of electric-contact pressure gage connected to borehole pump control unit. Reagent if injected into tubing from wellhead with tube space gate valve.

EFFECT: efficient injection, safe production of oil or gas.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method of oil-gas wells killing on deep water subsea deposits by pumping of certain volume of kill composition together with sea water into the well thus providing creation of killing spout in the well with timeless pressure on formation exceeding formation pressure not less than 1.2 times, as a killing composition, preventing immediate contact of cold sea water with overheated formation fluids and productive stratum of formation, large hydrophobic disperse system is used with density exceeding density of sea water more than 5 times in the volume ensuring in bottom-hole zone of the well creation of spout of large hydrophobic disperse system with height exceeding productive stratum formation opened by perforation not less than 3 times. Mentioned disperse system is a disperse system with volume of 70%, where as disperse medium hydrocarbon liquid is used, this liquid doesn't set solid under temperatures to -10°C, its density is not less than 0.860 g/cm3; as disperse phase a mixture of hard metal balls with diameter within 1-2 mm is used, 50% of this ball mixture volume have fusion temperature well over bottom-hole temperature, and the other 50% of this ball mixture volume have fusion temperature 10°C and more below bottom-hole temperature.

EFFECT: improving reliability of oil-gas wells killing on deep water subsea deposits with excessive temperature and pressure of productive formation.

3 cl, 2 tbl

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

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