Horizontal well operation method

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and may be used in the operation of a horizontal well. According to the method well operation is performed. A pipe string is run down to the horizontal well. An insulating material is injected through the pipe string to a water-inflow interval of the productive formation. Oil is extracted until the horizontal well is flooded. Under the main borehole along the boundary of the oil-water contact an additional borehole is drilled from the horizontal well per 50 m longer than the old hole. The coil tubing is run down to the well complete from below with a hydraulic whipstock and a screen, which openings are covered hermetically by a hollow bushing. The process fluid is injected to the coil tubing thus creating an excess pressure. Simultaneously the coil tubing is moved down until it gets to the additional borehole. The coil tubing is run down up to the bottomhole of the additional hole. At the wellhead a top cementing plug is set into the coil tubing. An excess pressure is created in the coil tubing above the top cementing plug and the hollow bushing is moved thus opening the screen openings. Microcement grout is injected through the coil tubing and flushed to the additional hole and the bottomhole zone. Simultaneously the coil tubing is pulled out for the purpose of additional hole filling with the microcement grout. Flushing of the microcement grout is stopped when pressure increases in the coil tubing up to a permissible value. The coil tubing is pulled out from the well and the process is withheld for cement setting and hardening. The additional hole is cut off from the old hole by setting a bridge plug in a kickoff interval at the inlet to the offshoot. A pump is run down at the process pipe string to the old hole of the horizontal well and operation of the horizontal well is started. At water encroachment into the produced product the process pipe string with the pump is pulled out from the well, a geophysical study is performed and a water-producing interval is indentified in the horizontal well. The water-producing interval in the old hole of the horizontal well is isolated.

EFFECT: increased efficiency of the method due to the complete exhaustion of oil reserves from the productive formation notwithstanding the drawdown value.

4 dwg

 

The invention relates to oil industry and can find application in the operation of horizontal wells.

The known method of operation of horizontal wells (patent RU №2335621, IPC EV 43/00, publ. 10.10.2008 G. Bulletin No. 28), which includes the fix via a clutchless pipe coiled tubing into the well process solution, development of the well and its operation, and in cased vertical portion of the wells are located in the column of pump-compressor pipes inside the column tubing is placed clutchless pipe, coiled tubing, pipe end of the coiled tubing is placed at the end of the uncased horizontal wellbore, the circulation pump in a horizontal well bore through a clutchless pipe coiled tubing high viscosity hydrophilic solution in a volume of 0.1-0.3 of the length of the horizontal wellbore, and then the leach solution in the amount of the horizontal wellbore in the productive layer, in this case, when the process solution of fix raise clutchless pipe coiled tubing with the fill rate of the horizontal wellbore technological solution, conduct technology exposure for response process solution, develop the well, and the subsequent operation in the first 10-15 day lead at the minimum load on the well.

The disadvantages of this method yavl�are:

- firstly, not enough high efficiency water shutoff (WRI) conducted through the horizontal wellbore This is because the barrel horizontal wells drilled along the strata of rocks, and the permeability of the rock strata along substantially higher than in the transverse direction, therefore, the produced water from the underlying aquifer is easily filtered by the layering of rocks along a thin layer of high viscosity hydrophilic solution, which is used as the solution of polyacrylamide and breaks in the barrel horizontal producing wells;

- secondly, the decline in reservoir properties due to the negative effects of chemicals due to injection into a horizontal well bore first high-viscosity hydrophilic solution, and then the process solution;

- thirdly, the exploitation well in the first 10-15 day lead at the minimum load on the hole, and with further increase in load (depression) on horizontal well water breakthrough will occur in the barrel horizontal wells from underlying vodoprivreda of the reservoir, as this will not allow to fully ensure the production of oil from the reservoir.

The closest in technical essence is a method of operating a horizontal SC�ageny (patent RU №2447265, IPC EV 43/00, publ. 10.04.2012 Bulletin No. 10), including well operation to the flooding of the produced products, the descent into the horizontal well tubing, the injection of the insulating material in the water shut-off interval of the reservoir, wherein after the descent of the tubing in the horizontal part of the borehole fill the annulus with cement mortar, conduct prodavcu cement mortar in near-well zone through the pipe string, stop prodavcu when the pressure equalizes in the column of pipes and Struble, conduct technology shutter speed for setting and hardening of cement, clean pipe string from the remnants of cement, conduct technology exposure for at least 3 months with periodic study of borehole environment pulsed neutron generator, stop technological restraint after the reading to stabilize pulsed neutron generator, according to the testimony of the pulsed neutron generator to determine the oil-saturated interval of the horizontal wellbore that is perforated net pay intervals from the far end of the horizontal wellbore to the mouth, 're screened oil to the watering interval, carried out the isolation of Obvodnogo interval and continued extraction of oil.

The disadvantages of this method are:

- firstly, the low efficiency of VIR conducted through the barrel in a horizontal�sentatives of the well. This is because the barrel horizontal wells drilled along the strata of rocks, and the permeability of the rock strata along substantially higher than in the transverse direction, therefore, the produced water from the underlying aquifer is easily filtered by the layering of rocks along the screen from cement mortar, destroying it, and rips into the trunk of the horizontal producing well, thus there is a need for re-VIR, that does not guarantee quality off watered interval horizontal wells;

- secondly, the decline in reservoir properties due to the negative effects of chemicals due to the injection and produce cement mortar in the reservoir, as the process insulation work implement through the barrel horizontal wells;

- thirdly, this method can realize only with a small depression, which does not allow to fully ensure the production of oil from the reservoir, since the increase in depression in the reservoir will occur the destruction of the layer of insulating material and a breakthrough of water in the barrel horizontal wells from underlying vodoprivreda seam;

- fourthly, the high duration of the method, associated with the fact that after injection etc�crush cement mortar in the reservoir is carried out technological exposure for at least 3 months with periodic study of horizontal wells.

The technical objectives of the proposals are to increase efficiency and VIR reducing the negative impact of chemicals on reservoir properties of bottom-hole zone of the producing well, as well as ensuring full development of oil reserves from the reservoir regardless of the size of the created depression on productive layer during operation of horizontal wells and reduction in the duration of the method.

The technical problem solved by the method of operation of horizontal wells, including well operation to the flooding of the produced products, the descent into the horizontal hole of the column of pipes, fix the column pipe insulating material in the water shut-off interval of the productive formation, the selection of oil to the flooding of horizontal wells.

What is new is that of horizontal wells under the main trunk along the border of the oil-water contact Buryats additional barrel, and the slaughter of an additional barrel drilled on 50 m longer than the bottom of the main trunk horizontal wells, then the mouth is lowered into the well column pipe bending - GT, equipped with a bottom hydraulic diverter and the filter, the openings of which are hermetically closed inside of the hollow sleeve fixed shear screw until the kickoff interval additional STV�La, pump process liquid in the column GT, creating excess pressure in the hydraulic diverter, simultaneously move the column down GT before getting a hydraulic diverter in additional barrel, dopuskayut column GT to the bottom of additional trunk, then at the wellhead in the column GT set the displacement tube, pressurized in the column of GT above displacement of the tube, under the action of which process liquid displacement pushes the tube to fracture the shear screws and move the hollow sleeve and against the end face of the hydraulic diverter, with open holes for the filter and the column GT they inject insulating material, which is used microchemistry solution, produce prodavcu microcemento solution to additional barrel and the bottom zone, at the same time raise the column of GT to fill the additional wellbore microcement solution, stop prodavcu microcemento solution when lifting the pressure in the column of GT to an acceptable value, remove the column GT from the well and carry out technological shutter speed for setting and hardening microcemento solution, cut off the extra barrel from the main trunk horizontal wells installation of a blind packer online�rule kickoff at the entrance to the sidetrack lowered into the main wellbore of a horizontal well pump on the technological pillar of the pipe and run horizontal well in operation, in case of flooding of the produced products is removed from the well technological pipe string with pump, produce geophysical surveys and determine obvodnuy interval horizontal wells, after which isolate obvodnuy interval of the horizontal main trunk of the well known technological equipment that is lowered into horizontal well before the descent of the pump on the technological pillar of the pipe in the well or in conjunction with it.

Fig. 1, 2 and 3 schematically and sequentially shows the proposed method of operation of horizontal wells.

A method of operating a horizontal well 1 (see Fig. 1) includes the operation of the well to the flooding of the produced products selected via the main trunk 2 horizontal wells 1 from the reservoir 3. Then remove pumping equipment (Fig. 1, 2 and 3 not shown) of the horizontal borehole 1 with the main barrel 2, for example, cased and secured casing with a diameter of 168 mm with a wall thickness of 9 mm and perforated holes 2'. From horizontal wells 1 under the main barrel 2 along the boundary of the oil-water contact Buryats additional barrel 4. NRA�emer, additional 4 barrel drilled with a diameter of 102 mm, predrilling additional barrel 4 from the horizontal borehole 1 is carried out using a diverter wedge, described in patent RU No. 2484231 "Wedge diverter for wellbore from wells", IPC EV 7/08, publ. 10.06.2013 G. the distance between the bottom 5 extra barrel 4 and the bottom 6 of the main shaft 2 horizontal wells 1 is 50 m. for Example, the bottom 6 of the main trunk of 2 horizontal hole 1 was drilled to 910 m. Then the bottom 6 of the main shaft 2 horizontal wells 1 perform longer than 50 m, which is: 910 m+50 m=960 m. In the borehole 1 is lowered pipe string, which is used as the column flexible pipes - GT 7, which equipped with hydraulic screw 8 (see Fig. 1 and 2), a filter 9, hole 10 which is hermetically closed from the inside hollow sleeve 11 fixed shear screw 12.

As hydraulic diverter 8 is used as described in the patent RU №2318112 "Hydraulic downhole deflector node", IPC EV 23/00, publ. 27.02.2008 or in the patent RU №2318111 "Hydraulic downhole deflector node", IPC EV 23/00, publ. 27.02.2008

Pull the column of GT before the kickoff interval 13 (see Fig. 4) additional trunk 4, fix the process fluid in the column GT 7 is pressurized in the hydraulic diverter 8 and synchronous�presents recent move columns GT 7 fall down hydraulic diverter 8 in the advanced trunk 4.

Will dopuskayut column 7 GT to the bottom 5 extra barrel 4.

Then at the wellhead in column 7 GT set the displacement tube 14, create excessive pressure in the column GT 7 above displacement of the tube 14 under the action of excess pressure of the process fluid in the column GT 7 push displacement tube 14 to fracture the shear screws 12 and move the hollow sleeve 11 until it stops at the end of the hydraulic diverter 8 (see Fig. 3).

As a result open the openings 10 of the filter 9.

The column GT 7 they inject insulating material, which is used microchemistry the solution of the following composition, wt.h.:

the microcement and has100
- protivoosadochnye reagent0,015-0,025
- the water loss reducer1,2-2,4
softener0,05-1,2
- antifoam0,04-0,12
- water80-130

Produce prodavcu microcemento solution to additional stem 4 and its bottom-hole zone 15 horizontal wells 1, while �odnimaet column 7 GT to fill the additional barrel 4 microcement solution for example, with the speed of movement of the column of GT 7, 0, 3 m/min.

Stop prodavcu microcement and has when lifting the pressure in the column GT 7 to achieve the acceptable values, for example to achieve in the column of GT 7, the maximum values of pressure in the reservoir 3.

Remove the column GT from wells 1 and conduct technology shutter speed for setting and hardening microcemento solution, cut off the extra barrel 4 from the main trunk of 2 horizontal hole 1 installing deaf packer 15' 13 kickoff interval at the input side in the barrel 4. Deaf packer 15' allows to exclude liquid flows from the side of the barrel 4 in the main trunk 2 horizontal wells 1.

Holding VIR via optional 4 barrel and not through the main trunk 2 horizontal wells 1, as described in the prior art, ensures the quality of VIR. Furthermore, the use of microcemento solution, unlike cement mortar, allows for a better isolation of water inflow due to the approximation penetration in the pore channels and cracks in the formation to the penetrating ability of the true solutions. Moreover, stored reservoir properties of the productive formation 3, which is connected with the exception of the negative impact of chemicals due to the injection and produce mi�recementing solution is not via the main trunk 2, but through an additional 4 barrel horizontal wells 1.

Also holding VIR via optional 4 barrel, drilled from horizontal wells 1, creates an impenetrable screen of microcement and has lower productive formation on the border GNC, allowing you to increase many times the depression that is created in the main trunk 2 horizontal wells 1 on the reservoir 3, which in turn makes it possible to provide oil from the reservoir 3.

Reduced the duration of the method, since after the VIR excluded technological shutter speed horizontal wells 1 for a period of not less than 3 months study with periodic horizontal wells 1, as described in the prototype.

Lowered into the main trunk horizontal wells pump 16 on the technological pillar of the pipe 17. Start horizontal well 1 in operation, in case of flooding of the produced products is extracted from horizontal wells 1 technological pipe string 17 by pump 16. Produce geophysical studies, for example, with application of complex geophysical AGATE-42 (OOO "TNG-Group", Bugulma, Republic of Tatarstan, Russia), the descent on the cable (Fig. 1, 2, 3 and 4 not shown) and determine obvodnuy interval of 18 horizontal wells 1 (see Fig. 4) the inflow into the main trunk 2 horizontally� well 1. For example, obvodnaya interval 18 (see Fig. 3) water flow in the main trunk 2 horizontal wells 1 is the interval 630-650 m. then isolate obvodnuy interval of the main shaft 2 horizontal wells 1 well-known technological equipment that is lowered into horizontal well before descending into a horizontal well 1 pump 16 on the technological pillar of the pipe 17 or in conjunction with it. For example, before descending into a horizontal well 1 pump 16 on the technological pillar of the pipe 17 (see Fig. 4) pull the profile pericryptal (Fig. 1, 2, 3 and 4 not shown), for example, according to the patent RU No. 2339786, IPC EV 29/10 dated 27.11.2008, the Method of installation of the relevant peregrinates in the well".

With the help of specialized peregrinates isolate obvodnuy interval 18 (see Fig. 4) of the casing main shaft 2 horizontal wells 1. Further, in a horizontal well 1 pull the pump 16 on the technological pillar of the pipe 17 and run it in operation.

Or, for example, equip a technological pipe string 17 by pump 16 (see Fig. 4) from the bottom of the shank 19 with the packers 20 and 21, allowing to isolate obvodnuy interval casing 18 of the main shaft 2 horizontal wells 1, wherein the shank in front of the packer 20 is equipped with a filter 22.

As the packers used the well-known packers, for example, naujausi� in contact with water. Descend above the equipment in the borehole, produce planting packer 20 and 21, for example, at intervals of 625 m and 655 m, which are respectively securely isolate obvodnuy interval 18 (630-650 m) of the casing main shaft 2 horizontal wells 1.

Further horizontal well 1 launch into operation, and the selection of oil pump 16 on the technological pillar of the pipe 17 is made simultaneously with two intervals, the first one with the "toe" of the horizontal wells 1 through the end of the shank 19 to the pump intake 16, and the second one with the "heel" of the horizontal wells 1 through the filter 22 of the shank 19 to the pump intake 16.

Re also eliminated in VIR obvodnaya interval casing 18 of the main shaft 2 horizontal wells 1, since this interval is reliably disabled equipment.

The proposed method of operating a horizontal well allows you to:

- to improve the quality of VIR;

- to reduce the negative impact of chemicals on reservoir properties of bottom-hole zone of horizontal wells and to exclude thereby reducing the productivity of the exploited aquifer;

to ensure complete depletion of oil reserves from the reservoir regardless of the size of the created depression on productive layer during operation of horizontal wells;

- with�hold the duration of the method.

The method of operation of horizontal wells, including well operation to the flooding of the produced products, the descent into the horizontal hole of the column of pipes, fix the column pipe insulating material in the water shut-off interval of the productive formation, the selection of oil to the flooding of horizontal wells, characterized in that the horizontal wells under the main trunk along the border of the oil-water contact Buryats additional barrel, and the slaughter of an additional barrel drilled on 50 m longer than the bottom of the main trunk horizontal wells, then the mouth is lowered into the well column pipe bending - GT, equipped with a bottom hydraulic diverter and the filter, the openings of which are hermetically closed inside of the hollow sleeve, fixed shear screw until the kickoff interval additional barrel, process liquid is pumped into the column GT, creating excess pressure in the hydraulic diverter, simultaneously move the column down GT before getting a hydraulic diverter in additional barrel, dopuskayut column GT to the bottom of additional trunk, then at the wellhead in the column GT set the displacement tube, pressurized in the column of GT above displacement of the tube, under the action of which the process liquid is pushed displacement of samples�have to fracture the shear screws and move the hollow sleeve and against the end face of the hydraulic diverter, while open holes for the filter and the column GT they inject the insulating material, which is used microchemistry solution, produce prodavcu microcemento solution to additional barrel and the bottom zone, at the same time raise the column of GT to fill the additional wellbore microcement solution, stop prodavcu microcemento solution when lifting the pressure in the column of GT to an acceptable value, remove the column GT from the well and carry out technological shutter speed for setting and hardening microcemento solution, cut off the extra barrel from the main trunk horizontal wells installation of a blind packer in the sidetracking area at the entrance to the sidetrack lowered into the main wellbore of a horizontal well pump on the technological pillar of the pipe and run horizontal well in operation, in case of flooding of the produced products is removed from the well technological pipe string with pump, produce geophysical surveys and determine obvodnuy interval horizontal wells, after which isolate obvodnuy interval of the main trunk horizontal well technology equipment that is lowered into horizontal well before the descent of the pump, a flow column �RUB in well or in conjunction with it.



 

Same patents:

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SUBSTANCE: according to method of development of oil well containing oil-bearing stratum and underlying water-bearing stratum divided by bulkhead having thickness of 0.8-2m the well is surveyed in order to identify position of oil-bearing and water-bearing stratum strata. State of the flow string is defined. Behind-the-casing-flows are identified. Inflow and injection profiles are defined. Then water-bearing stratum is perforated. A packer is run down to the upper boundary of water-bearing stratum and set. Then water shutoff compound is injected and flushed to water-bearing stratum in volume precalculated as per analytic expression. Water shutoff screen is formed. Then the packer is pulled out. Cement grout is pumped to the flow string up to the level higher than roof of oil-bearing stratum until it forms a cement plug insulating the stratum. Upon waiting period for cement hardening the cement plug is drilled out up to the depth higher than roof of water-bearing stratum. At that minimum waiting period for cement hardening is equal to 24-72 hours. Tightness of the bottom hole is surveyed. The oil-bearing stratum is penetrated within the required interval and oil is recovered.

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FIELD: physics.

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1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil production industry, in particular, to secondary and tertiary methods of enhanced oil recovery for beds with low oil saturation that envisage use of equipment for production of gaseous nitrogen with high pressure and temperature. Nitrogen compressor plant comprises a multistage piston-type compressor with a power drive unit made as diesel engine, and gas-separating unit. Output of the compressor intermediate stage is coupled to input of gas-separating unit. Output of gas-separating unit is coupled to input of the compressor stage, which follows the intermediate stage. At that nitrogen compressor plant includes heat exchanger, which working medium input is coupled to the compressor output. Input of the compressor heat exchanger is coupled to exhaust output of diesel engine. Gas-separating unit is made as a hollow-fibre membrane unit. Output of the heat exchanger working medium is coupled to input of additional heater. At that output of the additional heater serves as output of the station.

EFFECT: development of more effective means for oil extraction from low-permeable collectors complicated by high paraffin content.

8 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry and can be used for annular gas bypassing to the flow string in wells operated by sucker-rod pump units. Task of the invention is to perfect design of the downhole device for annular gas bypassing in order to improve operational efficiency of the well sucker-rod pumping equipment notwithstanding temperature conditions of the well operation and pressure of annular gas. The device is placed in the well annular space over the well fluid level in the flow string collar. The device comprises a return valve and a radial hydraulic channel. In the collar lower part there is a radial hydraulic channel interconnected to the well annular space at the one side through the return valve and to the flow string cavity at the other side through a jet device. At that axes of the radial hydraulic channel and the jet device are crossed in the nozzle area of the latter. Besides the device comprises a flow string with a whipstock for gas-fluid flow in it. The whipstock is made as a bushing capable to be fixed in the flow string collar. Length of the whipstock for gas-fluid flow is less than distance between receipt and discharge of the jet device. Axes of the radial hydraulic channel and the jet device are perpendicular. Fixation of the whipstock for gas-liquid flow in the flow string collar may be implemented by equipping the flow string collar with an inner groove and the whipstock for gas-liquid flow with a ring holder.

EFFECT: usage of device allows reducing pressure of annular gas notwithstanding temperature and pressure conditions thus increasing life between overhauls for the sucker-rod pumping equipment; besides, this device allows reducing pump-setting depth for the sucker-rod pump due to increase of fluid level over the pump thus reducing consumption of the flow string and pump rods and increasing life between overhauls for the units.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: according to the method the hydraulic fracturing of formation is performed. After hydraulic fracturing of the formation in the well the proppant underflash is left. From above in addition from the coarse fraction proppant the bridge with a rated length is created. This length is selected in view of the condition of providing of counter-pressure on the proppant in the hydraulic fracturing crack sufficient for holding of proppant in a hydraulic fracturing crack at decrease of liquid level in the well down to the well bottomhole level. The package of downhole pumping equipment includes the antisand filter. During the well operation the antisand filter is placed directly over the proppant bridge. The liquid is sampled. The liquid level during liquid sampling - operation is maintained at the level of the deep-well pump.

EFFECT: increase in oil production.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: as per the method, continuous lowering of a flexible pipe is performed into an internal cavity of tubing string to the well bottom. Gas is supplied to the well annular space. At the same time, gas is supplied to the space between the flexible pipe and the tubing string directly from the pipeline of the same well. Killing liquid is removed to day surface via the flexible pipe. Gas is supplied when the flexible pipe achieves killing liquid level. The flexible pipe is lowered at the specified speed from killing liquid level to the well bottom. Flexible pipe lowering speed and minimum required gas consumption providing killing liquid removal to day surface is determined as per an analytical expression.

EFFECT: improving efficiency of removal of killing liquid from a gas well due to continuous removal of liquid, reduction of gas consumption and power consumption.

1 ex, 1 dwg

FIELD: oil extractive industry.

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

EFFECT: higher efficiency, higher safety.

2 cl

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