Method of developing methane-coal well

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

 

The invention relates to the field of natural gas production and may be used in the development process metropoline wells.

The most significant difference between metropoles and gas wells due to the fact that natural gas (coal bed methane) is productive coal seam is not free, and in the adsorbed state. In order to enable the extraction of coalbed methane, you must first transfer it from the adsorbed state to a free state. With this purpose in metropoles well take measures to decrease the amount of back pressure on the reservoir, which must be less than the pressure at the beginning of desorption of gas from coal. To reduce the height of the liquid column in the well bore above the reservoir, as a rule, use a submersible pump.

A characteristic feature of wells for the production of coalbed methane is also a need to stimulate hasoutdata productive coal seam after his secondary opening (perforation). In the vast majority of cases in metropoline wells is hydraulic fracturing of the productive coal seam and formed therein artificial cracks are fixed proppant, which is blown into the reservoir together with the technological (carrier) fluid.

The known method development met naugolnoe well, according to which the production casing after perforation productive coal seam and the stimulation of his hasoutdata using tubing string down the submersible pump. The wellhead seal, followed by the call flow of formation fluid by gradually lowering the liquid level in the wellbore using a submersible pump. In the initial period of pumping fluid submersible pump placed in the production string above the perforated interval, in order to avoid absorption of various solids entering the wellbore from the reservoir. After cleaning the face metropoles well from the accumulated solids submersible pump installed in the production string below the perforated interval [1].

The disadvantages of this method include low efficiency of pumping gazozhidkostnoi mixture fed into the barrel metropoles well out of the productive coal seam. In addition, the need for simultaneous smooth decrease of the liquid level in the annulus and maintain it given value of wellhead gas pressure complicates the reliability and manageability of the development process metropoles well. These circumstances greatly increases the time and cost associated is with the development metropoles well.

Closest to the claimed method according to technical nature (i.e. prototype) can be considered as a way of mastering metropoles well, which includes a perforated production string and productive coal seam, performing hydraulic fracturing last to stimulate hasoutdata, the descent of the tubing string, the lower end of which is attached to a submersible pump in the production casing, perforated in the interval of the productive coal seam, placing a submersible pump below the perforated interval of the production casing, sealing the mouth metropoles well, lowering the liquid level in the annulus metropoles well up to the mark, below the perforated interval of the production string, and, maintaining the specified level using a submersible pump while injection of a buffer gas under positive pressure in the annulus metropoles well, the call flow of formation fluid through the bleed excess pressure of the buffer gas from the annulus metropoles well [2].

The disadvantages of this method include the difficulty in managing the development process metropoles well, due to the need to simultaneously reduce the liquid column in the annulus and n is Netania in he buffer gas provided that the total pressure of a buffer gas and a fluid column in the annulus metropoles wells must be less than the pressure at the beginning of desorption of coal methane in the reservoir.

The technical result - improving the efficiency of the development process metropoles well by simplifying the technology of its execution, reducing the duration, as well as improving the working conditions of a submersible pump.

The technical result is achieved due to the fact that in the proposed method of development metropoles well, including perforation of the production string in the range of productive coal seam, performing hydraulic fracturing last to stimulate hasoutdata, descent tubing string with a submersible pump in the production casing, placing a submersible pump below the perforated interval of the production casing, sealing the mouth metropoles well, lowering the liquid level in the annulus metropoles well up to the mark, below the perforated interval of the production string, while injection of a buffer gas under positive pressure in the annulus metropoles well, stopping the injection of a buffer gas in the annulus metropoles well at lower the liquid level to which tetki, below the perforated interval of the production string, maintaining the specified level of the liquid by means of a submersible pump after stopping the injection of a buffer gas and call flow of formation fluid through the bleed excess pressure of the buffer gas from the annulus metropoles well, after performing the hydraulic fracturing of the productive coal seam before lowering the tubing string with a submersible pump rinse the production string, then in accordance with the liquid level determines the starting value of the back pressure on the productive coal seam, which is supported in the process of lowering the liquid level in the annulus metropoles wells and simultaneous injection of a buffer gas, with the call flow of formation fluids carried out with the control of changes in the qualitative or qualitative and quantitative composition of the buffer gas on the mouth metropoles well, and the change in qualitative or quantitative composition of the buffer gas is judged on early receipt of coal methane from productive coal seam, after which the rate of release of the excess pressure of the buffer gas from the annulus metropoles well reduce.

In particular SL is the teas as a buffer gas use neutral (inert) gas, for example nitrogen or carbon dioxide, or a mixture of natural gas such as coal bed methane with a neutral gas and a buffer gas, which release from the annulus metropoles well, depending on its qualitative or quantitative composition is directed to the flare line or in the train.

It is recommended to set the pace bleed excess pressure of the buffer gas from the annulus metropoles wells in the call flow of formation fluids prior to the receipt of coal methane from productive coal seam is not more than 0.3 MPa/day, and after beginning receipt of coal methane from productive coal seam to reduce the specified rate 2-3 times.

The proposed method is implemented as follows.

After completion of the work associated with perforation of the production string in the range of productive coal seam, perform hydraulic fracturing last to stimulate hasoutdata. Production casing before descending into it tubing string with a submersible pump is thoroughly washed to remove residual process fluid and solid mechanical impurities (particles of sand, coal, cement etc), which accumulate in the barrel and at the bottom after discharge wells in the implementation of gidravlicheskiy productive coal seam. For washing of the production string, it is preferable to use produced water pumped from the nearby metropoles wells, which operates the same productive coal seam. If it is not possible to use technical water (if produced water is fresh or brackish).

After washing, before lowering the tubing string with a submersible pump, according to the established in the production string to the level of the liquid (brine or industrial water) calculate the hydrostatic pressure, which is balanced by pressure, i.e. determining the initial value of the back pressure at the open productive coal seam.

Then into the well on a tubing string down a submersible pump placed below the perforated interval of the production string. Specifications of submersible pump head should allow reliable operation at the chosen depth of the suspension in the production string, and performance must meet the maximum projected water production. After placing a submersible pump in a production string mouth metropoles well seal.

Pumping fluid from the casing by means of a submersible pump is carried out by the simultaneity the temporal injection buffer gas under positive pressure in the annulus metropoles well. You must ensure that the initial value of the back pressure on the productive coal seam was maintained during the entire process of lowering the liquid level in the annulus metropoles well up to the mark, which is located below the perforated interval of the production string. At the specified reduced level of the liquid source, the magnitude of the back pressure on the productive coal seam is provided by the cumulative impact of the liquid column above it, and the "gas spring" in the annulus metropoles well. With this purpose it is necessary to efficiently monitor the current values as the height of the liquid column above the productive coal seam, and wellhead pressure of a buffer gas in the annulus metropoles well.

Control over the position of the level of fluid in the production string can be done, for example, by using a host on the mouth metropoles wells sonar-sensor. If a submersible pump is equipped with a downhole pressure gauge with a wired communication channel, the problem of controlling the level of fluid in the production string, and its maintenance at a given elevation substantially simplified.

Monitoring the pressure of a buffer gas in the annulus metropoles wells during the first injection or grazing can be done using wellhead pressure gauge.

As the buffer gas, which is pumped into the annulus metropoles well, you can use either neutral (inert) gas, for example nitrogen or carbon dioxide, or a mixture of neutral gas with natural gas, for example with coal methane. From the point of view of workplace safety, one should prefer a neutral gas.

After the liquid level in the annulus metropoles wells will be reduced to a level that is below the perforated interval of the production string, the buffer gas injection should be discontinued. In the future (i.e. in the process of exploration and exploitation of wells) made the liquid level must be maintained at the expense of operational performance management submersible pump.

It is quite obvious that to improve working conditions submersible pump suitable as quickly as possible to reduce the level of fluid in the production string to the mark below the perforated interval. When this layer of fluid (gas-liquid mixture consisting of coal methane and water)flowing from the reservoir into the barrel metropoles well, under the action of gravitational forces is divided into liquid and gas components. As a result, the reception of a submersible pump comes Degas the new produced water.

The call flow of formation fluids is achieved by gradually decreasing the back pressure on the productive coal seam due to the gradual release of the buffer gas from the annulus metropoles well. The choice of the optimal rate of reduction of the magnitude of the back pressure on the productive coal seam must be carried out before development metropoles well. Smooth etching of the buffer gas from the annulus metropoles well by using wellhead adjustable throttle.

According to the results of the analysis of practical experience in the production of coalbed methane, should not prevent a sharp decrease in the magnitude of the back pressure on the productive coal seam, as it is fraught with negative consequences. The amount of back pressure on the productive coal seam, it is recommended to gradually reduce in two stages: prior to the receipt of coal methane from productive coal seam (i.e. prior to the desorption of coal methane) with a rate of not more than 0.3 MPa/day, and then (i.e. after the beginning of the desorption of coal methane) to decrease the rate of 2-3 times.

The flow of coal methane from productive coal seam (i.e. the beginning of the desorption process of coal methane in the productive coal seam), simply can determine on the mouth by means of the detector registering the change in the qualitative or quantitative composition of the buffer gas, which is discharged from the annulus metropoles well. It is also possible sampling buffer gas at the mouth followed by their analysis.

If as a buffer gas is used neutral gas, the beginning of the desorption of coal methane in the productive coal seam can be identified by the appearance and gradual increase of the quantitative indicator of the concentration of coal methane in the buffer gas.

If the buffer gas is a mixture of natural and neutral gases, the start of desorption of coal methane in the productive coal seam can be defined as a change measure (concentrations of methane or neutral gas in a buffer gas)and changes in qualitative indicator of the composition of the gas mixture of a buffer gas).

Depending on the composition of the buffer gas bleed from the annulus metropoles well, it can be directed from the wellhead to the flare line or in the train.

For example, the buffer gas, mainly consisting of neutral gas should be directed to the flare line. In the loop buffer gas, it is advisable to send after the content (concentration) of methane in it will be close to the value characteristic of the natural gas produced from wells on this Metropole qui the establishment. Typically, the methane content in the specified gas is 90% (volume) and above.

A gradual decrease in back pressure on the productive coal seam continue to until it begins to actively develop the desorption process of coal methane. The intensity of the above process over time increases, so at some point (to achieve expected performance metropoles wells gas) phase of development metropoles well is completed, followed by a stage of its operation.

Sources of information

1. "A Guide To Coalbed Mehtane Operations", Chapters 6 and 7. Prepared by Gas Research Institute, USA, 1992, s.6-14, 6-15, 7-3, 7-4.

2. RF patent №2288350, EV 43/00, publ. 27.11.2006, (prototype).

1. Method development metropoles well, including perforation of the production string in the range of productive coal seam, performing hydraulic fracturing last to stimulate hasoutdata, descent tubing string with a submersible pump in the production casing, placing a submersible pump below the perforated interval of the production casing, sealing the mouth metropoles well, lowering the liquid level in the annulus metropoles well up to the mark, below the perforated interval of the production string, while magneton and a buffer gas under positive pressure in the annulus metropoles well, termination of discharge of a buffer gas in the annulus metropoles well at lower liquid level to the level below the perforated interval of the production string, maintaining the specified level of the liquid by means of a submersible pump after stopping the injection of the buffer gas and the call flow of formation fluid through the bleed excess pressure of the buffer gas from the annulus metropoles wells, wherein after performing the hydraulic fracturing of the productive coal seam before lowering the tubing string with a submersible pump, rinse the production string, then in accordance with the liquid level determines the starting value of the back pressure on the productive coal seam, which is supported in the reduction process the liquid level in the annulus metropoles wells and simultaneous injection of a buffer gas, with the call flow of formation fluids is carried out by monitoring changes in the qualitative or qualitative and quantitative composition of the buffer gas on the mouth metropoles well, and the change in qualitative or quantitative composition of the buffer gas is judged on early receipt of coal methane from productive coal seam is, then the rate of release of the excess pressure of the buffer gas from the annulus metropoles well reduce.

2. The method according to claim 1, characterized in that as the buffer gas using a neutral gas such as nitrogen or carbon dioxide, or a mixture of natural gas such as coal bed methane, with a neutral gas.

3. The method according to claim 1 or 2, characterized in that the buffer gas release from the annulus metropoles well, depending on its qualitative or quantitative composition is directed to the flare line or in the train.

4. The method according to claim 1, characterized in that the rate of release of the excess pressure of the buffer gas from the annulus metropoles wells in the call flow of formation fluids prior to the receipt of coal methane from productive coal seam shall be not more than 0.3 MPa/day, and after beginning receipt of coal methane from productive coal seam specified rate shall be reduced by 2-3 times.



 

Same patents:

FIELD: oil and gas production.

SUBSTANCE: method to call inflow of a formation fluid from a well includes lowering of a tubing string into a well, reduction of pressure to a payout bed of liquid displacement column into a well with a gas-liquid mixture by means of its supply into an annular space with a booster device, provision of the required ratio of mixture components to achieve the specified value of pressure reduction at the payout bed. Prior to lowering into the well, a remote depth pressure gauge is installed on the lower end of the tubing string. Replacement of the entire liquid column in the well is carried out with pumping of a gas-liquid mixture (foam), including a surfactant, into the annular space with a booster device, at a low extent of aeration - 10-20 m3/m3. After appearance of foam circulation the extent of aeration is gradually increased to 150-160 m3/m3, and the average density of foam is brought to 100-120 kg/m3. Foam circulation is continued to achieve the specified value of reduced pressure at the payout bed, which is determined by readings of the remote depth pressure gauge. Afterwards foam circulation is stopped for 2-3 hours. The possible inflow of the formation fluid is determined from the well. If there is no inflow of the formation fluid, foam circulation is stopped, an annular valve is closed, and foam is pushed along the tubing string into the bed in the amount of 5-10 m3 with soaking in the bed for 3-4 hours. Afterwards the annular valve is opened, and foam circulation is restored at maximum extents of aeration to produce inflow of the formation fluid from the well.

EFFECT: increased quality and efficiency of calling for inflow of a formation fluid.

1 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed method consists in creating pressure sink in bottomhole formation zone in drilled and cased wells with flow string by decreasing well fluid level by displacing fluid by system of air and water phases to be forced through head wall. Said head wall is arranged at wellhead and made up of T-bend, ejector or aerator. Flow string is arranged in well so that its bottom end is located 1.5-2 m under perforation interval. Then, well is completely filled with process fluid. Inflow from bed is initiated on feeding water phase of 4.5-7 l/s and water phase of 120-130 l/s. System of said phases is injected into flow string annulus. After foam circulation indications, water phase feed is decreased to 1-1.5 l/s, maintaining gas-fluid circulation to keep well pressure sink for at least 3 h. In injecting gas-fluid mix, water phase feed is increased by 10-15% to improve gas inflow by ejector.

EFFECT: simplified mounting, higher efficiency.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: down-hole installation includes shank with flow control mounted on string, above the shank there is puckering device, sleeve, housing of jet pump with nozzle, mixing chamber and diffuser, also flow direction switch. The sleeve has central, through and side channels. The side channel connects central channel with sleeve outer surface and annular space. There is a flow direction switch in central channel in a form of hollow insert with blind end and hole in side wall located near by. The sleeve contains switching mechanism for hollow insert stroke length. Hollow insert from the side of blind end is mounted in central channel with the possibility of movement, when hydraulic connection or disconnection of the hole in side wall with sleeve side channel takes place. The housing of jet pump has a shoulder and side hole between nozzle and mixing chamber, connected to open end of hollow insert and installed with gap inside the saddle fixed in string. When hollow insert and hydraulic connection of the hole in side wall with side channel is moved, the shoulder of jet pump housing is tightly seated into the saddle.

EFFECT: increase of efficiency of alternating pressure effect on bottom-hole formation zone.

23 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves well development using tubing string and determination of inflow volumes of each branched shaft drilled from the main horizontal part of the well. Tubing string is equipped with swab limiter. Development is performed in swabbing cycles. According to the invention, tubing is equipped prior to lowering with two centralisers and packers between which outlet channels are located. Swab limiter is arranged in lower part of vertical section of tubing string. Development of branched shafts is performed individually for each branched shaft starting from the most remote one from the well head by cutting out the inlet of the chosen branched shaft in the main horizontal part of the well by means of packers from other branched shafts. After packers are installed, first acid treatment of the chosen shaft is performed by injection of 10-15% solution of inhibited chlorhydric acid based on 0.2-0.25 m3 per metre of the length of branched shaft with further process exposure.

EFFECT: possible development of branched shafts separately for each branched shaft without entering this one, acid treatment prior to development with elimination of occurrence of emergency situations in the wells.

2 dwg

FIELD: mining.

SUBSTANCE: method includes descending the cylinder into the hole by string, the cylinder has radial holes covered by valve unit due to connection to string in transport position, packer and circulation valve mounted before the packer for connection to the tubular annulus, sealing of tubular annulus by packer above the formation, decreasing fluid level in tubing string and tubular annulus for creation of differential pressure drawdown, opening valve unit. Level reduction in tubing string and tubular annulus is done via pumping of gassy fluid through flexible pipe preliminary descended into string till the interaction with circulation valve that is opened in transport position for connection to tubing string and tubular annulus. Valve unit capable of fluid inflow from formation with string in transport position is opened after creating differential pressure drawdown and circulation valve is closed. After that the formation undergoes acid treatment with the following process holding. Then flexible pipe is descended into the string, gassy fluid is pumped into the string to decrease the fluid level in it and create differential pressure drawdown with carrying out the product of acid reaction with formation solid. The device includes packer connected to the string, wellhead fittings with branches hydraulically connected to the tubing string and tubular annulus of string, cylinder with radial holes mounted under the packer, the holes are covered in transport position, valve unit performed in a form of piston fixed in the cylinder in upper position and circulation valve located above the packer performed in a form of sleeve with lower end stop and side holes capable of closing by hollow bush fixed in upper position by shear elements. The device is equipped with flexible pipe descended into tubing and capable of interacting with hollow bush after creation of differential pressure drawdown for its movement till the end stop with closing the side holes open in transport position. Radial holes of the cylinder are closed in transport position by piston fixed in the upper position by decomposable elements and capable of opening the radial channels at movement downwards. The piston is additionally equipped with valve passing the fluid upwards.

EFFECT: simplification of inventions and adjustment of differential pressure drawdown value in the course of well development.

2 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves formation of depression pressure drop between bottom-hole zone and cavity of tubing string by pumping of fluid, pressure relief with arrangement of fluid flow from bottom-hole zone to day surface at opening of quick-acting valve of tubing string cavity, creation of periodic wave processes in bottom-hole zone of formation, repetition of stages of pressure relief and creation of negative pressure pulses. Maximum increase in pressure drop is arranged between bottom-hole zone and well zone due to packer installed at design depth in annular space; monitoring of wave processes is performed using calculation system based on readings of pressure gauges and pulse pressure sensors calibrated on the installation of impact tube type.

EFFECT: higher efficiency of wave action on well.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of wave processing of productive formations of oil deposits with manifold of fracture type involves determination of resonant characteristic of formation, use of wave generator and formation processing by means of waves with resonant frequency, which are created with generator. Besides, in order to determine resonant characteristic of formation, linear dimensions of pillars are measured, peculiar size of rock pillar is determined and row of resonant frequencies is calculated for wave processing as per the specified mathematical expression. Then, oil formation is processed by performing a series of in-series processings by radiation of waves of mechanical nature of the calculated row of resonant frequencies in frequency decreasing order. Mechanical-nature wave generator located in the well in the area of processed formation zone is used as wave generator.

EFFECT: increasing oil recovery of formations.

2 cl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method involves well development using tubing string and determination of inflow volumes of each branched shaft drilled from the main horizontal part of the well; at that, tubing is equipped with swab limiter, and development is performed using swabbing cycles. According to the invention, tubing string is equipped prior to lowering with hydraulic deflector with inlet holes and packer, which are located closer to the head relative to inlet channels of deflector, and swab limiter is arranged in lower part of vertical section of tubing string. Besides, development of branched shafts is performed separately for each branched shaft starting from the most distant one from the well head due to in-series introduction prior to development by means of deflector to the chosen branched shaft of tubing string and insulation of this branched shaft from the main horizontal part of the well with a packer.

EFFECT: possible individual development of each branched shaft, including strongly contaminated one, as well elimination of swab blocking, breakage of rope and occurrence of emergency situations in the well.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of acoustical impact on oil formation involves impact at acoustical or ultrasonic frequencies and at low acoustical frequencies - 20 Hz or 50 Hz. Length of packs of acoustical or ultrasonic impact is half the period, which is chosen for low acoustical frequency impact. Acoustical impact on oil formation includes acoustical emitter, operating frequency - 8-25 kHz and generator of packs of strong electrical signals at operating frequency of acoustical emitter.

EFFECT: increasing formation oil recovery and improving the device reliability.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the first version of gas well development method gas is supplied from group of operation wells with low pressure to transportable compressor plant (TCP), where gas is cleaned from mechanical impurities and water, compressed to TCP operating pressure and supplied to booster station by pipeline. At the same time service water is pumped to booster station by means of the first pump unit. Produced gas-liquid mixture (GLM) is compressed in booster station to pressure value equal to value of booster station operating pressure. After that high pressure GLM is supplied to gas separator, where GLM is separated into high pressure gas and liquid. Liquid is supplied to the first pump station for continuation of process cycle, and high pressure gas is supplied to ejector to which there also supplied is foam-forming liquid. Foam system obtained on ejector is supplied to flexible pipe of coil tubing unit, which is lowered to inner cavity of tubing string, in tube space of the well with stops in every 50-100 m.

EFFECT: providing influx of gas well from formation under ALFP conditions with anomaly ratio below 0,2 and reducing the time required for well development.

2 cl, 6 dwg

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: oil and gas industry.

SUBSTANCE: typical well operating equipment can include separator for separation of water from oil, in which the produced mixture of fluid media is obtained and mixture is divided into the corresponding water and oil flows. Water flow can be pumped back to the well. For that purpose, well system for water pumping speed control back to the well can be developed. Group of inventions provides the improvement of well flow control efficiency. Essence of inventions: well equipment designed for receiving fluid medium flows through the first and the second fluid medium flow passage channels is arranged in the well. The above equipment includes flow separation control having the device connected to the first channel and the device connected to the second channel, which are interconnected. Outlet flows in the first and the second channels are controlled by means of the control.

EFFECT: increasing outlet flow in one of the first and second channels in response to increase in outlet flow in the other of the first and the second channels by means of action on one of the above devices to keep constant ratio of outlet flows in the above channels.

16 cl, 6 dwg

FIELD: oil and gas production.

SUBSTANCE: method includes gaslift well operation by adjusting the flow rate of working and produced gas. The withdrawal of produced gas is done by tubing string and additional tubing string. The flow rate of working and produced gas is adjusted by opening and closing of driven shut-off elements in accordance to the control signals. Control signals come from automatic control unit and are generated according to the results of measured values compared with set parameter values. Note that the pressure is measured in the mouth and bottom hole, at the same time the flow rate of produced gas is measured. The flow rate of working and produced gas is adjusted in such a way to provide the specified well operation mode.

EFFECT: increase of well operation efficiency, reduction of level and removal of fluid accumulated in bottom-hole zone, provision of well operation stability.

2 cl, 1 dwg

FIELD: oil and gas production.

SUBSTANCE: system for use in the hole includes the string designed for location in the hole that consists of submersible electric pump, the first part of inductive coupler and completion section. Note that completion section is located in the well zone under development and includes the second part of inductive coupler, isolating packer, detection cable and electric device electrically connected to the second part of inductive coupler. Note that detection cable goes through the packer for provision of sensors to some well zones.

EFFECT: increase of system operation efficiency and collection of measurement data referred to the well characteristics.

28 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: well of hydrocarbon raw material deposit, either gas one or gas-condensate one, includes production string with tubing string with underground operating equipment. Operating equipment includes at least a cutout valve with remote control, which is provided with an actuator, and well head with wellhead equipment. Wellhead equipment comprises casing head, tubing head on which there mounted is X-tree in the form of a fir tree, which includes shutoff members - master and side gate valves with actuators, as well as throttle valve adjacent to the latter, which controls the well flow rate and is provided with an actuator, and monitoring and control members - fuse insert and gas line pressure monitoring valve. Well is connected to control station by means of shutoff members, throttle valve and cutout valve. Control station is made in the form of a cabinet and includes pump accumulator plant and at least one control unit per well.

EFFECT: improving reliability and accident-free operation of gas well and simplifying the control of processes.

12 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: opening and closing of shutoff-control valves of well cluster is performed by independent supply of working medium to actuators of shutoff-control valves and underground cutout valves in the specified sequence, as well as valves controlling the flow rate of each well. Method is implemented by means of control station mounted in the cabinet and including instrumentation and control, as well as hydraulic system. Hydraulic system includes pneumatic hydraulic pressure accumulators combined with working medium tank, pumps, pressure controls and multiplying gears, and has the possibility of controlling actuators of shutoff-control valves with time delay and in certain sequence. At that, in addition, control lines of loop and flare gate valves are mounted in cabinet of the station, which are installed on pipelines in close proximity to control cabinet, for example on one common frame.

EFFECT: invention simplifies mineral deposit production control process, as well as allows reducing the area occupied with process equipment.

21 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: single wells or wells forming clusters are drilled; production wells are equipped with wellhead equipment with X-tree including at least one side gate valve and one master gate valve, as well as underground cutout valve and throttle valve and monitoring and control members, which are installed on the loop, for example, fuse strip and gas line pressure monitoring valve. Operation of the well is performed at simultaneous control of production processes of hydrocarbons by means of the station. Control processes involve opening and closing of shutoff-control valves of well cluster by independent supply of working medium to actuators of shutoff-control valves, as well as flare and loop gate valves, which are arranged on pipelines in close proximity to control cabinet, for example on one common frame with control cabinet. Opening of shutoff-control valves of each well is performed in the following way: underground cutout valve, master gate valve, loop gate valve, side gate valve; closing is performed in the reverse order.

EFFECT: improving operating reliability of shutoff-control valves.

3 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: well cluster includes at least two wells. Each well includes underground operating equipment containing cutout valve and wellhead equipment having casing head, tubing head on which there mounted is X-tree including shutoff members - master and side gate valves. Well cluster is connected to control station of actuators of shutoff members, which is made in the form of a cabinet. Control station includes power lines of function control of shutoff members' actuators. In addition, control lines of loop and flare gate valves are mounted in the cabinet. Loop and flare gate valves are installed on pipelines in close proximity to control cabinet, for example on one common frame.

EFFECT: reducing the surface area occupied with the equipment and increasing cluster operating safety.

12 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: control method of X-tree consists in opening/closing of shutoff-control valves by supplying the working medium to mechanisms of actuators of underground cutout valve, side and master gate valves by means of control station. Control station includes pneumatic hydraulic system connected through monitoring sensors of station operation parameters to control unit of the station. As control unit there used is software-and-hardware system with local control panel containing a display with sensor control to enter commands in on-line mode and local keyboard.

EFFECT: improved operating reliability of the control station and simpler design of the latter.

18 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

Up!