Water inflow into well limitation method

FIELD: oil-and-gas industry.

SUBSTANCE: invention related to oil-and-gas industry and can be used for water inflow into well limitation methods. According to the method execute high viscosity oil and cement heated mixture pumping via thermal insulated pipes, driving with low viscous oil and process ageing. According to the invention kill the well with well killing fluid, execute works until well specific intake capacity value is equal 0.5-3.0 m3/(h·MPa), pump into the well not less then 8 m3, with density equal well killing fluid density. Execute pumping though thermal insulated pumps of the high viscosity oil and cement heated mixture with consumption rate 2-10 m3/hour.

EFFECT: production wells water inflow insulation efficiency increase.

1 ex

 

The invention relates to the oil industry and can be used to limit water production in the well.

There is a method of isolation of free gas inflow into the borehole, including the creation of a gas insulation screen and putting the well into operation. Create a gas insulation screen with the given parameters by injection into the isolation zone plugging materials, including hydrocarbon dispersion medium and cement (application for invention of the Russian Federation No. 2001107412, published. 2003.02.20).

There is a method very little limits the inflow of water into the well.

The closest to the proposed invention the technical essence is the way of the development of oil deposits, including flooding, injection into the reservoir rim oil and bitumen product (heavy oil) and selection of oil from producing wells. The injection of oil and bitumen product is carried out in a heated form through insulated pipes, lowered into the vertical portion of the well. Before rim etc product are displacement in the layer of unheated low viscosity oil developed reservoirs. The displacement rims etc product are unheated low viscosity oil developed reservoirs in the upper part of the productive formation is not below the oil-water contact. As oil and bitumen product, a mixture of oil asphalt and cement is in the ratio of 1:(0,3-0,7) by volume, 1 Pogue. m of net oil pay part consume 1.2-2.0 m3the mixture of oil asphalt and cement injection lead to the rise of pressure at the wellhead to a value equal to the hydrostatic ±30%, conduct technological patience waiting for the hardening of the cement and the well completion carried out cyclically: flushing oil and oil withdrawal within 1-2 days - stop for 1-2 days when the number of cycles from 2 to 4, and then transferred to a permanent selection of oil.

The method is suitable for isolation zones acquisitions in the injection wells, however, the application of insulation work in producing wells does not lead to sufficient to effect isolation of the water.

In the proposed invention solves the problem of the increasing isolation of the water in producing wells.

The task is solved in that in the method of limiting the inflow of water into the well, comprising pumping in heated through insulated pipes mixture of heavy oil and cement, the displacement of low viscosity oil and conducting technological exposure, according to the invention the pre-hole jammed with fluid damping, are working to increase the specific capacity of the well to values of the order of 0.5-3.0 m3/(h·MPa) or more, pumped into the well of not less than 8 m3liquids with density equal to the density of the kill fluid, the injection of a mixture of cement and viscous the oil is conducted with a flow rate of 2-10 m 3/PM

The invention

When working oil wells have area flooding of the produced product to be isolated. Existing methods limit inflows of water into the well solve the problem of watering only partially. In the proposed method solves the problem of the increasing isolation of the water in producing wells. The problem is solved as follows.

In conducting activities to limit the inflow of water into the well to perform the killing the well, are working to increase the specific capacity of the well to values of the order of 0.5-3.0 m3/(h·MPa) or more, pumped into the well of not less than 8 m3liquids with density equal to the density of the fluid damping, perform the injection of a mixture of cement and high-viscosity oil with a flow rate of 2-10 m3/h in a heated form through insulated pipes, carry out the displacement of low viscosity oil and conducting technological exposure. After the well is completed and extracted products (oil with less water content).

When the specific capacity of the well is less than 0.5 m3/(h·MPa) perform well-stimulation operation, such as acid treatment, clay formation removal, clearing of clogging deposits, etc. When the specific capacity of the well over 3.0 m3/(h·MPa) carry out activities to reduce pickup, such as injection Ave the bottomhole zone of dispersion of the filler, artificial clay grouting with bentonite, etc. In the original pickup in the range from 0 to 3.0 m3/(h·MPa) they control the pickup, and fill the bottom hole zone of the process fluid with density equal to the fluid damping.

The amount of high-viscosity oil and the weight of cement per well operation is: when the specific capacity of the well from 0.5 to 1.4 m3/(h·MPa) volume of high-viscosity oil is 10-20 m3and the weight of cement per 1 m3high-viscosity oil is 0.3-0.7 t; when the specific capacity of the well from 1.4 m3/(h·MPa) or more, the volume of high-viscosity oil is 20-35 m3and the weight of cement per 1 m3high-viscosity oil is 0.7 to 1.5 T.

When preparing the mixture heated high-viscosity oil is fed into the mixing head cement-mixing plant, where it is mixed with cement, is sent to the intermediate tank and from there pumped into the well. (The temperature of the injected mixture is not lower than 40°C).

The viscosity of the oil used for insulation shall be not less than 250 MPa/s at 20°C.

Specific example

Stop the oil hole and jammed her mineralized water density of 1.1 kg/m3. The injection capacity of the well is 0.4 m3/(h·MPa). Work is underway to bring specific premises and well to values of the order of 0.5-3.0 m 3/(h·MPa). To do this, perform the acid treatment of bottom-hole wells, which resulted in the acceleration increased to 1.1 m3/(h·MPa). Pumped into the borehole 10 m3water with a density equal to the density of the liquid damping (1.1 kg/m3). At the wellhead cook the mixture is pre-heated heavy oil and cement: the amount of high-viscosity oil is 15 m3and the weight of cement per 1 m3high-viscosity oil is 0.5 so Heated up to 60°C the mixture is pumped with a flow rate of 5.5 m3/h through insulated pipes in the bottom zone of the well. The mixture is forced into the bottom zone of low viscosity oil in the volume of the column tubing. Conduct technology exposure for 48 h, learn well, and the oil extracted.

As a result, the water content in crude production fell from 70%to 35%.

The application of the proposed method will allow you to isolate the water in producing wells.

A method of restricting the inflow of water into the well, comprising pumping in heated through insulated pipes mixture of heavy oil and cement, the displacement of low viscosity oil and conducting technological exposure, wherein the pre-hole jammed with fluid damping, are working to increase the specific capacity of the well to values of the order of 0.5-3.0 m3 /(h·MPa), is injected into the well of not less than 8 m3liquids with density equal to the density of the kill fluid, and pumping the mixture of cement and high-viscosity oil lead with a flow rate of 2-10 m3/H.



 

Same patents:

FIELD: oil-and-gas industry.

SUBSTANCE: method of efficiency recovery and stand by wells, with collector of complicated design in abnormally low formation pressure conditions and production string bottom part collapse includes execution of repair-isolation works and reservoir opening. Sweep up the string, repair its compressed bottom, wash in a sand plug till depth of the nearest to a gas-water contact - GWC clay sub layer, descend in to the string a tail from casing pipes of a smaller diametre up to the sand plug head, with the tail head dislocation 20 m above of the reservoir roof, cement the tail with a cement slurry, leaving a cement barrel 1-2 m higher the tails shoe. After cement fixing - CFT drill the cement barrel, wash the sand plug up to the current GWC, through perforation holes with perforation interval 15-20 m3 of the water sealing composition, press it through 3-5 m3 of the cement slurry in to the reservoir, creating water sealing screen and stop over the defined height cement barrels sand plug. After the CFT execute perforation - hydro-sand-jetted or with powerful cumulative perforator - of the production string and the tail in interval over cement barrel head up to the reservoir roof and gas flow activation. The cement slurry contains portlandcement, superplastisiser C-3, polyvinyl alcohol, and polypropylene fiber.

EFFECT: well efficiency recovery and stand by wells operation start up reliability increase.

1 ex, 4 dwg

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production, particularly to production efficiency increase. The method includes pumping into reservoir, through injection wells system, into zones around wells tall oil with filler - dispor in amount 5-10% of the tall oil and continue watering.

EFFECT: reservoir input profile aligning, oil withdrawal reservoir watering efficiency increase.

2 tbl

FIELD: oil and gas production.

SUBSTANCE: invention is related to gas production industry, in particular to methods for isolation of bottom water influx in gas wells. In method for isolation of bottom water influx in gas wells, including lowering of oil well tubing (OWT), pumping of blocking polymer compound with previously identified value of structural viscosity in annular space, cement isolating substance along OWT, their pushing through with process fluid, lowering of OWT is done down water entry bed, additionally prior to pumping of blocking polymer compound, a low-viscous gel-forming compound is supplied into annular space, which contains the following components, wt %: sodium silicate of "Sialit 30-50" grade 50, liquid waste from process of electrochemical metal coating 0.8, water - the rest, adding the latter to water entry bed, and blocking polymer compound is added to gas-bearing bed, then they are pushed through by pumping of process fluid along OWT with annular space closed, blocking polymer compound is used with a value of structural viscosity that exceeds at least thrice value of structural viscosity of low-viscous gel-forming compound, for headers with high permeability they use polymer compound as blocking polymer compound with organic filler, containing the following components, wt %: lignosulphonate 5, calcium chloride 15, gas condensate 20, peat-alkaline filler 7, technical water - the rest, and for headers with low permeability - polymer compound with condensed solid phase, which contains the following components, wt %: calcium chloride 9, twice-substituted ammonium phosphate 11, water-soluble polymer 2, surfactant 1, technical water - the rest, at the same time volume of blocking compound is defined according to given calculation formula, and pumping of cement isolation compound along OWT is done in volume that exceeds volume of operational pipe in interval of water entry bed by 20%, at the same time pushing of cement isolation compound is started to be done with annular space open, and after it reaches bottom of gas bearing bed, it is pushed with annular space closed with pressure that exceeds pressure of absorption.

EFFECT: development of efficient method for isolation of bottom water influx in gas wells.

2 ex, 2 tbl

FIELD: oil and gas production.

SUBSTANCE: method of recovery of yield and bringing to operation of temporarily shut-in wells with complicated structure of collectors under conditions of abnormally low bed pressure including repair, insulating, and exposure of producing bed consists in following: initially, sand plug is washed for depth 2-3 m below current gas-water contact (GWC); producing string is callipered, shank end out of casing tubes of smaller diametre is lowered into producing string up to head of washed sand plug; head of shank end is arranged 20 m above top of producing bed. The shank end is cemented with cement grout; upon waiting-on-cement completion (WCC) two columns, the producing column and the shank end are perforated in interval below the first over current GWC clay interlayer to depth 2-3 m below current GWC. Water insulating composition at volume 15-20 m3 is pumped through perforated openings made for water insulation; composition is forced through into depth of the producing bed creating a water insulating screen with cement grout of volume 3-5 m3; a cement sleeve 1-2 m above the first over the current GWC clay interlayer is left at the bottomhole. Upon WCC perforating is performed for operation of two columns, the producing column and the shank end in interval above the second over the current GWC clay interlayer up to the top of the producing bed; gas discharge is initiated. Composition containing Portland cement, super-plasticiser C-3, polyvinyl alcohol and polypropylene fibre is used as cement grout; while for perforation either a high-power cumulative perforator or hydraulic jet are used.

EFFECT: insulating fluid entry, ensuring pressure tightness of producing column and additional gas withdrawal from earlier shut-in wells.

1 ex, 4 dwg

FIELD: oil-and-gas production.

SUBSTANCE: invention relates to the oil industry, particularly to methods of processing strata of oil-fields, and can also be used for waterproofing oil wells and for regulating intake profile of intake wells. The method of processing oil-field strata involves pumping a composition into the strata, containing aqueous solution of an anionic polymer, water soluble inorganic or organic acid or a mixture of acids, aliphatic or aromatic alcohol or a product containing it, and a polyvalent metal salt. The said composition also contains a surface-active substance or a mixture of surface-active substances, fine-grained hydrophobic material FGHM and an inhibitor. Before adding polyvalent metal salt to the aqueous solution of anionic polymer, the said alcohol or product containing it, surface-active substance or mixture of surface-active substances, FGHM and inhibitor are added and pH of the reaction mixture is brought to 0.5-3.0 by adding the said acid or mixture of acids with the following content of components, wt %: water soluble anionic polymer 0.004-5.0, alcohol or product containing it 0.50-50.0, surface-active substance or mixture of surface-active substances 0.50-10.0, FGHM 0.1-3.0, polyvalent metal salt 0.003-0.30, inhibitor 0.1-3.0, water - the rest. The invention is developed in a subclaim.

EFFECT: more efficient processing of strata due to improvement of rheological and hydrophobisation properties of pumped compositions, as well as their oil-sweeping properties.

2 cl, 4 tbl, 4 ex

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil producing industry, particularly, to procedures of isolation and restraint of water production in horizontal boreholes of producing wells. The procedure consists in polymer pumping, in driving polymer solution, and in well shut-down for the period of polymer structure formation. Prior to pumping polymer solution into each interval, blocking fluid with optimal period of "life" is pumped into the well; further, specified volume of polymer is pumped into an isolated interval during this period of "life"; after the expiration of the period blocking fluid self-decomposes in volume required for filling the horizontal borehole from the bottomhole of the well to the nearest from the bottomhole boundary of interval of polymer solution treatment. Upon conditioning, decomposer of polymer is pumped into the well for the period of polymer structure formation in the latest treated interval; with water decomposer is further driven through into a reservoir to the nearest near-well zone and is conditioned there for the period of polymer decomposition.

EFFECT: increased efficiency of isolating water production in horizontal wells.

5 dwg, 1 ex

FIELD: mining.

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10 cl, 2 dwg

FIELD: oil and gas industry.

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EFFECT: upgraded efficiency of method due to effect of hydrophobisation of porous space, increased amount of forming cementing material, thermo-stabilisation of this material under conditions of high temperatures of bed (above 80°C) and creating more reliable isolation screen.

2 cl, 2 tbl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to methods of increasing oil production and reducing water cutting of production. According to the method water with initial ionic force of 0.0004-0.0008 mole/l is activated in a cathode zone of diaphragm electrolytic cell chamber during 0.5-3 hrs at imposition onto water of electric field of E=(1000-15000) V/m strength. Powder of silica sand, or glauconite, or a rank of alumina silicates: zeolite or amphoteric materials: bentonite, montmorillonite, nontronite, kaoline (anauxite), talk, pyrophyllite, each separately or in random mixture are introduced into activated water at weight ratio to water 5-25%. Produced dispersive mixture is passed through the cathode zone of the electrolytic cell at strength of electric field E=(1000-15000) V/m at a rate of 1-10 m3/hour during one hour, thus obtaining activated dispersive system which further is pumped into horizon in volume of 5-100 m3. After that fresh water is pumped into the horizon as a buffer at volume of 1-20 and 3-80 m3 of horizon water as driving under pressure of 60-90 atm at during 3-5 hours.

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2 ex

FIELD: petroleum industry.

SUBSTANCE: invention relates to oil and gas production industry, namely to dry operation of wells. The substance of the invention is as follows: according to this method wells are equipped with flow and production strings and includes injection of water repellent compound under pressure into the seam. According the invention prior to mining operations a flexible pipe is lowered into the internal space of the production string under pressure by means of the coil tubing rig. The circular and annular spaces of the well are opened. The water repellent compound is injected through the flexible pipe in the amount required, overpressure being maintained in the circular and annular spaces, which exceeds the pressure of the water repellent compound injected by not less than 10%. The water repellent compound is forced through into the seam up to the depth required. Next the flexible pipe is withdrawn out of the well. The water repellent compound is injected regularly during the period of increased gas extraction out of wells without killing the same.

EFFECT: possibility of long-term dry operation of wells with maintaining initial effective thickness of the seam.

3 cl, 1 ex, 3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: installation includes well equipping with a one-parker or multi-parker assembly on reservoirs depth, with ability to descent a tubing string with an electrical submersible pump with or without a shell into the well, and with at least one control valve. The multi-parker assembly equipped with connected or disconnected between each other, at least two landing units, located over the top parker and between parkers accordingly. The control valve equipped with an external separator and an internal tail with a sealing device. The electrical submersible pump descending over the multi-parker assembly executes with ability of a simultaneously sealed connection, of the sealing element to the landing units between parkers, also the external separator to the landing unit over the top parker. The control valve consists of a case with at least two hydraulically connected with each other non-axial and one axial pass through channels, inside of which located shut off element of a electromechanical, electromagnetic or hydraulic action, such as a piston, a plunger, a shut off valve or a rotary disk, installed with ability to move for instances to the middle, or up and down, or rotation from one position to another, and signal or impulse control from the wellhead or automatic control based on the fluid parametres, transmission through a cable or tube, or a tubing string or a medium. At that at one of its position, all of the pass through channels, partly or in total, connected to the electrical submersible pump inlet and to the well reservoirs as well, for the simultaneous fluid production, at another position - cutting of the fluid, at least from one of the reservoirs by shutting off inlet or outlet of the corresponding non-axial channel for characteristics and regime research of at least one of the reservoirs, which is still open. In one-parker assembly version, the control valve connected to the shell form the top, and with parker-from the bottom.

EFFECT: well production installation efficiency and reliability increase.

10 cl, 10 dwg

FIELD: machine building.

SUBSTANCE: group of inventions is related to stop and control valves, in particular to valves of stop and control pipeline facilities, which are used for control of transported medium flow, and may be used to control flow of gas in technological piping of gas or gas-condensate well, in gas pipeline, at compressor station, in gas storages. Control valve comprises vessel with central channel, with cage lock unit installed in it, with supply and drain nozzles and combined drive mechanism. Combined drive mechanism consists of two drive mechanisms of unidirectional action and one mechanism of counterdirectional action. Cage stop unit comprises cartridge with throughput holes and throttle gate. Cartridge is made of hard-alloy material. Throttle gate is installed with the possibility to close throughput openings of cartridge, is arranged in the form of cup, internal surface of which is protected with highly strong layer, which is congruent to its shape, and is connected to stem. Stem is connected to shaft by means of coupling. Drive mechanisms are mounted on shaft with the possibility of autonomous action. One of mechanisms is arranged as pneumatic, the other one is mechanical or manual, and the third one, which complements them, is arranged in the form of automatic mechanism of shaft reciprocal motions, which are counterdirectional to any of mentioned drive mechanisms of unidirectional action. On valve body the following components are mounted serially with shaft enclosure - body of shaft reciprocal motion mechanism, pneumatic drive mechanism, mechanical or manual drive mechanism. Pneumatic drive mechanism is arranged in the form of membrane chamber, having membrane installed on rigid disk. Disk is rigidly fixed on shaft. Mechanical or manual driving mechanism is equipped with converter of rotary motion into reciprocal motion of shaft, is mounted with the possibility of shaft autonomous displacement without transfer of rotary motion to it in direction of valve opening-closing and is communicated to mechanism of shaft reciprocal motions with the possibility of automatic closure of cartridge throughput holes by throttle gate with rotation of mechanical or manual drive mechanism that permits such motion and duplicates pneumatic one. There is version of control valve design.

EFFECT: increased working allowances in manufacturing and provision of stable operation of device in wide range of positive and negative temperatures in various climatic conditions, simplified kinematics of drive and its application in any operational conditions, when it is necessary to involve duplicating drive mechanism.

25 cl, 10 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil-and-gas industry and can be used in oil production to reduce well drowning and make well service life longer. Proposed device comprises pipe string. Said pipe string is perforated in its lower part when used in horizontal or inclined-directional well. Pipe string inside accommodates tubing column wherein submerged pump is mounted. Note here that tubing column perforation hole area per column unit side surface, first, decreases along its length and, then increases. In pump location zone, there can be no perforation at all.

EFFECT: reduced drowning, longer life of wells, increased yield, lower costs.

5 cl, 9 dwg

FIELD: oil-and-gas production.

SUBSTANCE: devise designed for oil-and-gas production during separate production of water and oil without water withdrawal to the surface, on fields with high oil viscosity. Device consists of fixed stepped cylinder with installed in it differential piston, including suction and injection valves, free piston, low pressure lift system for water supply into cylinder and high pressure lift for pumping water into reservoir, parker and additional chamber with suction and injection valves and sealing element, providing lower cylinder and two-row lift and parker system hydraulic connection. Device equipped with additional parker, dividing oil saturated reservoir layers from water saturated ones. The cylinder executed as a three-stepped, which bottom step has a bigger diametre than middle one, but smaller than its upper step.

EFFECT: reservoir oil recovery increase, cast and power consumption cutting.

4 dwg

FIELD: oil and gas production.

SUBSTANCE: invention elates to technology of gas-and-oil producing industry and can be used for regulation of parametres of medium flow, particularly regulation of medium consumption, pressure difference, pressure in pipe string, bottomhole or annular pressure, as at extraction of fluid, as and at discharge of actuating medium into well. Removable double-ended regulator contains casing with side jet openings and axial pass, located between fishing head and shank end, in which there are implemented hydraulic channels for communication to medium. In casing it is installed cross solid partition, separating cavity of casing for two noncommunicating cavities, and side jet openings are implemented in casing before and after partition. External diametre of casing part, in which there are implemented side jet openings, yield to external diametre of the rest part of casing. Invention is developed in dependent claims.

EFFECT: increase of effectiveness and service life of extractive and/or forcing stratums of wells ensured by reduction of intensity of washing out of inner surfaces of regulator's casing.

11 cl, 5 dwg

FIELD: oil-and-gas production.

SUBSTANCE: device includes lift string of pipes and plunger pump, implemented with ability of hydraulic communication of over-plunger and under-plunger parts. Pump casing on inner surface is outfitted by rows of vertical slots of length Lo with distance between to edges of underlying and bottom edges of overlying rows of slots Lp. Plunger on outside surface at a distance Lt from bottom butt is outfitted by annular chamfers with openings inside the plunger. Additionally Lp≥2Lo, Lt≤0,5Lo, and plunger's length of stroke Lx=(8-10)(Lo+Lp). Device is outfitted by tail, located lower the pump.

EFFECT: increasing efficiency of dilatative-wave action in well.

1 dwg

FIELD: oil and gas production.

SUBSTANCE: group of inventions refers to procedure of pumping lift gas into production flow string of oil well via one or several devices for control of yield of lift gas and to facility applied thereon for control of lift gas yield. The essence of the invention is as follows: the facility consists of a tubular case of a valve with a flow passage connected with one end to pressure pipeline of lift gas, while with another end to internal space of production string; further the facility consists of a rotation body of a flap valve connected to the body of the valve and installed in the flow passage so that when the body of the valve turns into an open position it is essentially oriented parallel to the flow passage. When the body of the valve rotates into a closed position it orients perpendicularly to the flow passage and is pressed to a circular saddle of the valve thus shutting off lift gas pass via the flow passage. Also there is a protective bushing designed to slide in the flow passage between the first position, wherein the bushing passes through the circular saddle of the valve during rotation of the valve body in the open position protecting the valve saddle and valve body from wear under flow of lift gas or other fluid, and the second position wherein the bushing passes through a part of the flow passage before the valve body during rotation of the valve body in the closed position. There is a flow limiter forming a part of the protective bushing of the valve; dimension of the limiter produces different pressure with lift gas flowing through it; difference in pressure actuates the bushing to move into the first position. Also the bushing is characterised with a tapered narrowing part. External diametre of the bushing gradually diminishes in a successive direction of the bushing; the first flexible sealing ring is installed in the case before the saddle of the valve, therefore external surface of the narrowing part of the saddle is pressed to internal surface of the first sealing ring when the bushing is in its first position and in such way there is ensured an impenetrable for fluid sealing in circular space between the narrowing part of the bushing and the tubular body of the valve; as a result, in the second position of the bushing, the first sealing ring just not tightly contacts the narrowing part of the bushing.

EFFECT: facilitating efficiency of procedure and reliability of device operation.

10 cl, 2 dwg

Wellhead equipment // 2368759

FIELD: oil industry.

SUBSTANCE: invention refers to oil production, and namely to wellhead equipment. It consists of a casing head with side taps, which rests upon the pipe hanger with side taps, and the device for relieving pressure from the tube space. The device meant for relieving pressure from the tube space is a jet pump installed in the tube hanger tap. The suction of the jet pump is connected with the nozzle to the casing head cavity and to the annular space between the production casing and the flow column. The assembly for separate throttling of water and gas and for warming the flow being pumped is installed on the nozzle before the jet pump suction.

EFFECT: providing gas extraction and pressure relief from the tube space; when the flow is warmed, reliability of the wellhead equipment is increased.

1 dwg, 2 cl

FIELD: oil-and-gas production.

SUBSTANCE: invention relates to mining industry and can be used for exploiting oil-gas fields through remote, automatic and manual control of well shutting-off devices. According to the method, a well can be controlled through opening and closing of shutting-off devices of an X-mas tree - wing and casing valves and an underground safety valve, as well as through regulation of well flow rate using a throttle valve. The well is connected to a control station connected to a central control unit, which comprises a pump-accumulator unit and a well control unit. The pump-accumulator unit comprises a group of pumps and a power functional hydropneumatic accumulator, linked through an actuating medium, mainly in form of liquid, with a high-pressure line, which connects them to the well control unit. The high-pressure line is connected through reducing pressure regulators to power lines for functional control of shutting-off devices and the throttle valve. The station is equipped with a logical control line, which is connected to actuating mechanisms, providing for automatic command transmission for consecutive closure of the wing valve, casing valve, underground safety valve through delay mechanisms. Each delay mechanism has a control hydropneumatic accumulator and a throttle, adjusted for given delay of flow of actuating medium from the control hydropneumatic accumulator. The shut-off command arrives at the actuating mechanism of the wing valve first, then with given delay, to the actuating mechanism of the casing valve, after which, with given further delay, to the actuating mechanism of the underground safety valve. The logical control line is hydraulically linked to monitoring and control devices - a fuse link and a low- and high-pressure control valve. The monitoring and control devices are connected through the actuating medium, each to its trigger mechanism which controls pressure release in the given logical control line. The logical control line is doubly provided with similar trigger mechanisms for remote and manual triggering successive closure of the said well shutting-off devices in the said order.

EFFECT: more reliable and accident-free operation of an oil-gas field, reduced cost of extracting formation fluid, easier control of processes due to automated control of well shutting-off devices.

24 cl, 3 dwg

FIELD: oil-and-gas production.

SUBSTANCE: invention relates to mining industry and can be used for exploiting gas fields through remote, automatic and manual control of well shutting-off devices. According to the method, a well can be controlled through opening and closing of shutting-off devices of an X-mas tree - wing and casing valves and an underground safety valve, as well as through regulation of well flow rate using a throttle valve. The well is connected to a control station, which comprises a pump-accumulator unit and a well control unit. The pump-accumulator unit comprises a group of pumps and a power functional hydropneumatic accumulator, linked through an actuating medium with a high-pressure line, which connects them to the well control unit. The high-pressure line is connected through reducing pressure regulators to power lines for functional control of shutting-off devices and the throttle valve. The station is equipped with a logical control line, which is connected to actuating mechanisms, providing for automatic command transmission for consecutive closure of the wing valve, casing valve, underground safety valve through delay mechanisms. Each delay mechanism has a control hydropneumatic accumulator and a throttle, adjusted for given delay of flow of actuating medium from the control hydropneumatic accumulator. The shut-off command arrives at the actuating mechanism of the wing valve first, then, with given delay, to the actuating mechanism of the casing valve, after which, with given further delay, to the actuating mechanism of the underground safety valve. The logical control line is hydraulically linked to monitoring and control devices - a fuse link and a low- and high-pressure control valve. The monitoring and control devices are connected through the actuating medium, each to its trigger mechanism which controls pressure release in the given logical control line. The logical control line is doubly provided with similar trigger mechanisms for remote and manual triggering successive closure of the said well shutting-off devices in the said order.

EFFECT: more reliable and accident-free operation of a gas field, reduced cost of extracting gas, easier control of processes due to automated control of well shutting-off devices.

25 cl, 3 dwg

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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