Recovery of self-squeezing gas well with abnormally low seam pressure

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to recovery of said well located at multihorizon field. Proposed process comprises injection of isolating composition via well tubing string and fitting of "liquid" packer below tubing string shoe. Then, flow tubing above "liquid" packer is filled with killing fluid. Tubing string is withdrawn from the well. Deflector wedge is fitted inside tubing string. Lateral opening is cut in tubing string above overlaying high-pressure productive bed. Side hole is bored through said bed to extend through its entire depth to make side hole face occur nearby said high-pressure productive bed. Casing string with filter is lowered into bored side hole. Casing string is cemented above filter to the roof of top high-pressure productive bed and said wedge is withdrawn. Hanger with latch joint arranged at its inner surface is lowered on temporary string. Said hanger is fitted inside flow string under side opening. Oil string provided with side opening is lowered into flow string till interaction with latch device so that side openings of both strings are located opposite each other. Then, influx from lateral hole is initiated to remove killing fluid from the well. Then, liner with centring funnel at its shoe and packer hanger at its top is lowered on flexible pipe inside oil string to "liquid" packer. Solvent is injected via said liner. Said solvent destructs said "liquid" packer its residues falling on the face. Now liner is lowered to bottom holes of perforation interval of the bottom low-pressure productive bed. Liner is suspended in oil string above side opening of oil string. Flexible pipe is withdrawn from the well to place the well in operation.

EFFECT: efficient recovery.

7 dwg

 

The invention relates to the oil and gas industry, namely, to restore samoudalyayushcheisya gas wells with abnormally low formation pressure (anpd), located on the multilayer field.

At the final stage of development of gas deposits formation energy is not enough to ensure removal of accumulating on the bottom of the liquid from the well. Under the influence of all increase the volume of this liquid well stop, because the energy of the reservoir and, accordingly, the gas flow rate is insufficient for the removal liquid on the surface. When reaching a certain height of a column of the liquid at the bottom of the gas from the reservoir cannot overcome the liquid barrier and the well closeduniverse, i.e. off, turning in an inactive Fund [Kustyshev A. C. Complex repairs of gas wells in Western Siberia. - M.: OOO "Gazprom Expo 2010. - 212 S.]

To remove the liquid from the bottom samoudalyayushcheisya gas wells and their withdrawal from idle Fund is subject to various methods, for example:

the blowing wellbore into the atmosphere or gas;

- pumping downhole, solid or liquid surfactants;

- reduction of the diameter of the tubing string;

- the use of plunger lift.

On multilayer fields, it is affected over exploited lower low-pressure reservoir with abnormally low upper high-pressure reservoir at a higher pressure, for the production of low-pressure gas from the lower productive low-pressure reservoir and remove accumulated on the bottom of the liquid, you can use the energy of high-pressure top of the reservoir, feeding the high-pressure gas in the lower low-pressure reservoir.

Known way to restore samoudalyayushcheisya gas wells, including the descent into the well tubing string with gas-lift valve, the gas flow through the well annulus and the gas lift valve in the Elevator column, lifting water from a well on a tubing string [RF Patent №2239696, publ. 2004].

The disadvantage of this method is the inevitable clogging of the bottomhole zone of the reservoir (PPP) in the process of killing and descent into the well tubing string with gas-lift valve.

Known way to restore samoudalyayushcheisya gas wells, including descent in the Elevator column the column of pipes of smaller diameter [RF Patent №345266, publ. 1972].

The disadvantage of this method is the inevitable clogging of the PPP in the process of killing and descent into the well column pipe of smaller diameter.

The challenge with the invention, is to restore samoudalyayushcheisya gas wells and resume from idle Fund at minimal cost.

Technical result achieved, which recip what is the result of invention, is to restore samoudalyayushcheisya the inactive gas wells under conditions of abnormally low without killing and associated clogging of the PPP.

The task and the technical result is achieved by the fact that the recovery samoudalyayushcheisya gas wells with abnormally low formation pressure placed on the multilayer field, carried out in such a way that through lifting column in the well, pumped insulating composition and set below the Shoe tubing string fluid packer, then fill the internal cavity of the casing above the liquid packer fluid damping are then removed from the wells Elevator column, installed in the internal cavity of the casing whipstock, cut in the production string above the roof overlying the high pressure of the productive formation side window, drilling through it sidetrack, passing through the entire thickness of the upper high-pressure productive formation with the release of the bottom side of the barrel near the roof of the high-pressure reservoir, down in the drilled lateral wellbore casing with filter, cement casing above the filter to the roof top of the high-pressure reservoir, then remove from the well whipstock, the lower technologist from the character string suspension device is placed on the inner surfaces of the snap connection, install lifting device in the internal cavity of the production string below the side Windows, then descend into the internal cavity of the production casing Elevator column, provided with a side window to interact with snap connection suspension device so that the side Windows tubing and production casing are placed opposite each other, followed by stimulation of the lateral trunk and removed from the well kill fluid, then put a flexible tube into the inner cavity of the tubing string to liquid packer shaft with centering funnel on his Shoe and patrolsim outboard unit in its upper section, pumped through the shank solvent, destroy under its influence, "liquid" packer, the remains of which fall to the bottom, then dopuskayut the shank to the bottom holes of the perforated interval of the lower low-pressure reservoir, hung shank in the tubing string above the side Windows tubing string are then removed from the bore of the flexible pipe and enter the well into operation.

In Fig.1 presents a scheme of the proposed method when installing liquid packer of Fig.2 - the same, during the drilling of a sidetrack, and Fig.3 - the same, when installed in the production string suspension device of Fig.4 - the same, when the descent of the tubing string; in Fig.5 - the same, when the shutter shank tubing string of Fig.6 - the same, when installing the liner in position; Fig.7 is the same, after completion of rehabilitation works well.

The method is implemented as follows.

Recovery samoudalyayushcheisya gas wells with abnormally low, is located on a stacked field and has the following structure (Fig.1): the conductor 1, the overlapping area of permafrost) 2, the production casing (EC) 3, overlying the high-pressure top 4 and bottom 5 low-pressure reservoirs and suspended in a casing head (not shown), the lifting column (LC) 6 suspended in the tube head (not shown), on which is placed a Christmas tree wellhead equipment (not shown), carry out the following method.

The inner cavity Luke 6 upload insulating composition 7, which after curing is lower Shoe Luke 6 becomes "liquid" packer 8.

After (Fig.2) solidification liquid packer 8 fill the inner cavity EK 3 above the liquid packer 8 fluid damping 9. Then pipe head x-Mas tree disassemble the fountain tree, mounted BOP equipment (not shown) and from wells extract Luke 6.

Then in the inner cavity EK 3 set the whipstock 10, EC 3 by known techniques cut the Ute side window 11 and carry out drilling through his side of the trunk (BS) 12 at the top of the high-pressure reservoir 4. In the drilled BS 12 lower casing 13 has mounted on its end area of the filter 14, for example, type FB, and cement it above the filter 14 to the roof top productive high-pressure reservoir 4. And in the casing 13 BS 12 column tubing is not down, so the profile of the barrel is a descending section of the trunk to the base of the upper high pressure of the productive formation and subsequent upward part of the trunk, and the inflection point is located at a distance equal to 2/3 the length of the barrel, held in the reservoir. This profile barrel ensures the production of gas from all intervals, as from the start, and end, while escaping from the gas stream end portion of the barrel, the liquid accumulates at the site of the break and out of the borehole, since the flow velocity at this point is sufficient for its removal, but insufficient for the removal of fluid from the end of the interval. After completion of the cementing of the casing 13 of the wells retrieve the whipstock 10.

In the borehole (Fig.3) the process column of drill pipe (not shown) lowered suspension device 15 is placed on the inner surfaces of the snap connection 16, carry out the installation of the suspended device 15 in the inner cavity EK 3 below the side Windows 11 are then removed from the IC is Ainy technology column.

In the borehole (Fig.4), into the internal cavity EK 3, the lower LK 6 made in her side window 17, interacting with snap connection 16 suspension device 15 via a snap connector 18, is made on the outer surface of Luke 6 so that the side window 17 of the tubing string and the side window casing 11 are placed opposite each other.

Luke 6 (Fig.5) down to the bottom of the roof productive low-pressure reservoir 5 and hung up in the tube head x-Mas tree is installed on the column head. On trumpet head x-Mas tree, after the dismantling of the BOP, mounted fountain tree. Learn the borehole, causing the inflow of high-pressure gas from the BS 12 through the holes of the filter 14 and thereby removing from EK 3 kill fluid 9. At the wellhead is mounted coiled tubing unit (not shown).

The inner cavity Luke 6 despise PA flexible tube (GT) 19 to liquid packer 8 shank 20 with the centering funnel 21 on his Shoe and patrolsim suspension device 22 on its upper section. Pumped through the shank 20 solvent 23, for example, hydrochloric acid, under the influence of which destroy the "liquid" packer 8, the remains of the packer 8 fall to the bottom 24.

Will dopuskayut shank 20 (Fig.6) to the lower holes of the perforated interval 25 nignog the productive low-pressure reservoir 5, hung shank 20 with pokerwise suspension device 22 in Luke 6 above the side Windows 17 tubing string. In conclusion, from the well remove GT 19 and removing unnecessary for the equipment.

High-pressure gas (Fig.7) from the upper productive high-pressure reservoir 4 through the holes of the filter casing 14, the casing 13 and the side Windows 11 of the production casing and tubing string 17, resting on zapakowany sealed packer 26 enters the annular space 27 between Luke 6 and the shank 20 and further to the bottom 24 of the hole, picks up where the low-pressure low-pressure gas productive formation 5 and accumulated on the bottom 24 of the liquid and the internal cavity of the shank 20 and then in Luke 6 brings to the surface. To implement the circulation process fluids above and below the packer 26 mounted in the upper 28 and lower 29 circulation valves. The gas-contact (DDC) 30 is located below the lower holes of the perforated interval of 25.

An example implementation of the method.

Example 1. The inner cavity LK diameter 114 mm pumped insulating composition consisting of carboxymethylcelluose (CMC), bichromate, oil, which after curing becomes "liquid" packer. Fill the internal cavity of the EC with a diameter of 168 mm above the liquid packer fluid damping, as to the second used water solution of calcium chloride (CaCl 2) density 1200 kg/m3. Well remove LK. Then in the inner cavity of the EC set the whipstock, cut out the side window and carry out drilling through his side of the trunk on top of the high-pressure reservoir. In the drilled BS lower casing 114 mm in diameter, equipped with a filter FB-114, and cement it to the roof top of the high pressure of the productive formation. Well retrieve the whipstock. In the hole on the technological pillar of the drill pipe with a diameter of 42 mm down and set the suspension device PN-114/168 placed on the inner surfaces of the snap connection in the internal cavity of the EC below the side Windows are then removed from the wells process column. Into the well, into the internal cavity of the EC, the lower LC 114 mm in diameter made in her side window, interacting with snap connection suspension device PN-114/168 so that the side window tubing string and the side window casing are placed opposite each other. LUX down to the bottom of the roof productive low-pressure reservoir and hung up in the tube head x-Mas tree AF-100×21 installed on the column head OCC-210-324×168. For tubular head mounted fountain tree x-Mas tree and the well is completed, removing the liquid is killing. The inner cavity Luke put a GT with a diameter of 42 mm to liquid packer shank of pipes with a diameter of 60 mm with centering funnel on his Shoe and patrolsim outboard device PN-60/114 on its upper section. Into the shank of the solvent, which is used as hydroponic, under the influence of which destroy liquid packer. Will dopuskayut the shank to the bottom holes of the perforated interval of the lower low-pressure reservoir, hung liner using suspension PN-60/114 in Luke above the side Windows tubing string. In conclusion, from the well remove GT.

Example 2. The inner cavity LK diameter 102 mm pumped insulating composition consisting of methylcellulose (MC), dichromate and kerosene, which after curing becomes "liquid" packer. Fill the internal cavity EK diameter 146 mm above the liquid packer fluid damping, which use an aqueous solution of CaCl2the density of 1900 kg/m3. Well remove LK. Then in the inner cavity of the EC set the whipstock, cut out the side window and carry out drilling through his side of the trunk on top of the high-pressure reservoir. In the drilled BS lower casing with a diameter of 102 mm, equipped with a filter FB-102, and cement it to the roof top highly reliable the priori of the productive formation. Well retrieve the whipstock. In the hole on the technological pillar of the drill pipe with a diameter of 38 mm lowered and set the suspension device PN-102/146 placed on the inner surfaces of the snap connection in the internal cavity of the EC below the side Windows are then removed from the wells process column. Into the well, into the internal cavity of the EC, the lower LK diameter 102 mm made in her side window, interacting with snap connection suspension device PN-102/146 so that the side window tubing string and the side window casing are placed opposite each other. LUX down to the bottom of the roof productive low-pressure reservoir and hung up in the tube head x-Mas tree AF-100×21 installed on the column head OCC-210-245×146. For tubular head mounted fountain tree x-Mas tree and the well is completed, removing the kill fluid. The inner cavity Luke put a GT with a diameter of 38 mm to liquid packer shank of pipes with a diameter of 60 mm with centering funnel on his Shoe and patrolsim outboard device PN-60/102 on its upper section. Into the shank of the solvent, which is used as Neeson, under the influence of which destroy liquid packer. Will dopuskayut the shank to the bottom holes of the interval is and perforation of the lower low-pressure reservoir, hung liner using suspension PN-60/102 in Luke above the side Windows tubing string. In conclusion, from the well remove GT.

Example 3. The inner cavity LK diameter 89 mm pumped insulating composition consisting of CMC, aumontzey alum and diesel fuel, which after curing becomes "liquid" packer. Fill the internal cavity of the EC with a diameter of 140 mm above the liquid packer fluid damping, which use an aqueous solution of CaCl2density 1800 kg/m3. Well remove LK. Then in the inner cavity of the EC set the whipstock, cut out the side window and carry out drilling through his side of the trunk on top of the high-pressure reservoir. In the drilled BS lower casing with a diameter of 89 mm, equipped with a filter FB-89, and cement it to the roof top of the high pressure of the productive formation. Well retrieve the whipstock. In the hole on the technological pillar of the drill pipe with a diameter of 32 mm lowered and set the suspension device PN-89/140 placed on the inner surfaces of the snap connection in the internal cavity of the EC below the side Windows are then removed from the wells process column. Into the well, into the internal cavity of the EC, the lower LK diameter 89 mm made in her side of the room, interacting with snap connection suspension device PN-89/140 so that the side window tubing string and the side window casing are placed opposite each other. LUX down to the bottom of the roof productive low-pressure reservoir and hung up in the tube head x-Mas tree AF-100×21 installed on the column head OCC-210-245×140. For tubular head mounted fountain tree x-Mas tree and the well is completed, removing the kill fluid. The inner cavity Luke put a GT with a diameter of 32 mm to liquid packer shank of the pipe diameter 50 mm with centering funnel on his Shoe and patrolsim outboard device PN-50/89 on its upper section. Into the shank of the solvent, which is used as hydroponic, under the influence of which destroy liquid packer. Will dopuskayut the shank to the bottom holes of the perforated interval of the lower low-pressure reservoir, hung liner using suspension PN-50/89 in Luke above the side Windows tubing string. In conclusion, from the well remove GT.

The inventive method provides reliable recovery of previously dormant due to its samozatachivanie well and putting it up in the city without clogging the PPP under conditions of abnormally low.

Method of recovering samoudalyayushcheisya ha the new wells with abnormally low formation pressure, posted on stacked field in which through the Elevator column in the well, pumped insulating composition and set below the Shoe tubing string fluid packer, then fill the internal cavity of the casing above the liquid packer fluid damping are then removed from the wells Elevator column, installed in the internal cavity of the casing whipstock, cut in the production string above the roof overlying the high pressure of the productive formation side window, drilling through it side-hole passing through the entire thickness of the upper high-pressure productive formation with the release of the bottom side of the barrel near the roof of the high-pressure reservoir, down in the drilled lateral wellbore casing with filter, cement casing above the filter to the roof top of the high-pressure reservoir, then remove from the well whipstock, the lower the technological pillar suspension device is placed on the inner surfaces of the snap connection, set the suspension device in the internal cavity of the production string below the side Windows, then descend into the internal cavity of the production casing Elevator column, provided with a side window, until the interaction is with the snap connection of the suspension device, what side Windows tubing and production casing are placed opposite each other, followed by stimulation of the lateral trunk and removed from the well kill fluid, then put a flexible tube into the inner cavity of the tubing string to liquid packer shaft with centering funnel on his Shoe and patrolsim outboard unit in its upper section, pumped through the shank solvent, destroy under its influence, "liquid" packer, the remains of which fall to the bottom, then dopuskayut the shank to the bottom holes of the perforated interval of the lower low-pressure reservoir, hung shank in the tubing string above the side Windows tubing string are then removed from the bore of the flexible pipe and enter the well into operation.



 

Same patents:

FIELD: transport.

SUBSTANCE: method for installation of rapid-moving eduction column includes passing the rapid-moving column into a well, engagement of key for interaction with occlusion with nipple occlusion, extending interacting with profile key on rapid-moving column to interact with corresponding stopping profile in well shaft wall and thus supporting the rapid-moving column. In this method, interaction of the key with nipple occlusion causes extending the key interacting with profile into engagement with stopping profile.

EFFECT: higher reliability of holding the rapid-moving column while keeping relatively large flow diameter of the column.

29 cl, 8 dwg

FIELD: oil and gas industry.

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4 cl, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention relates to submersible pumping units for operation of wells, where it is necessary to increase the differential pressure drawdown, without deepening of submersible pumping unit, and/or with unsealed production casing. The unit for oil-well operation includes the tubing string, electric submersible cable, electric submersible pump, the hydroprotection and submersible electric motor of which are encapsulated in the pressure-tight housing, which is tightly closed on the housing of the input unit of the electric submersible pump, the liner consisting from the pipe string the top part of which through the bushing is tightly connected to the bottom part of the pressure-tight housing, and in the bottom part of the liner the branch pipe with external sealing elements is located. The unit contains at least one packer with internal through passage channel with the diameter allowing to pass through the packer the tool, equipment and instruments, without extracting the packer. The sealing unit for the tight connection with the branch pipe of the liner is located either in the packer housing, or in the device below or above the packer.

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1 dwg

FIELD: oil and gas industry.

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2 cl, 3 dwg

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EFFECT: enhanced method's efficiency.

5 cl, 3 dwg

FIELD: oil-and-gas industry.

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3 dwg

FIELD: mining.

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3 cl, 3 dwg

FIELD: oil and gas industry.

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2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention suggests the method of borehole and wellhead equipment layout for well survey envisaging injection of injection fluid to the formation and extraction of fluids from the formation, which includes running in of a flow string to the well with a jet pump or a circulation valve intended for compressor operation with isolation of the flow string and annular space. At that the tubing shoe is run in up to the level of upper perforation holes or as much as closer to it. The packer is set at distance of 20 metres at most from the tubing shoe, over the packer or as close as possible to it at one of the flow string pipes one or two circulation valves or a jet pump and a mandrel below them with one or two remote (permanent) pressure and temperature quartz sensors for tubular and annular space. The well head is equipped with a packaging arrangement consisting of a lubricator, two wellhead pressure and temperature sensors to control buffer and annular parameters, a choke chamber with an adjustable choke, a multiphase flow meter, a sampler allowing oil, water and gas sampling in conditions of the well operation, a discharge unit comprising two angled bends and two choke chambers. Connection of a feeder is envisaged for pumping of injection fluid or delivery of working agent from a tank to the buffer line or annular space. The line from the feeder is equipped with a branch pipe via the choke chamber with the adjustable choke back to the tank; a flow meter is mounted in the line from the feeder to the well downstream the branch line in order to control volume of the fluid fed to the well. In order to increase reliability of pressure and temperature measurement one or two self-contained or remote pressure and temperature sensors are mounted under the packer. In order to increase accuracy of phase debit measurement in the formation flow at the flow string over the packer or below it a downhole multiphase flow meter is mounted with functions of continuous monitoring of phase consumption as well as function of downhole pressure and temperature measurement.

EFFECT: for the purpose of direct and back circulation in the well bore a direct and return circulation valves are included into composition of the downhole assembly.

4 cl, 2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: at construction of production well, vertical shaft is drilled through rocks, including unstable mud shale, with entry into productive seam, going-in of production string to productive seam, cementing of annular space and drilling the shaft from production string into productive seam. At exposure of horizon with unstable mud shale, mechanical drilling rate is set not over 6 m/h for drilling with increased flushing fluid flow rate of about of 30-40 l/s using drilling solutions with density of 1.12-1.40 g/cm3. After well shaft drilling, drilling assembly performs cleanup job over well shaft with working of the shaft by rotary machine at rotor rpm of 40-100 rpm. Drilling fluid mixed with fibres in amount of 6-15 m3 is forced through the shaft and drill assembly reciprocates over the length of drive pipe. For well shaft casing operation string is lowered section-by-section. First 400-1000 m long section is lowered to well bottom on drill tool and annular space if cemented in interval from bottom to first section head. Cement is cured to lower production string second section. Sections are coupled, annular space is cemented and cement is cured. Production string is sealed.

EFFECT: ruled out sticking of drill tool in drilling unstable mud shale.

2 cl, 3 ex

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

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling of operation well, forming in productive bed within feeding range of operation bed of at least one level of main draining system by drilling horizontal shafts from operation well above productive bed, and driving said shafts in radial direction, also, to prevent fast watering of well, before start of its operation, hollows of horizontal shafts are isolated from operation well. In productive bed in feeding range of operation well on one level with main draining system additional draining system is formed, one additional level of main and/or additional draining systems is formed, hollows of operation well and horizontal shafts is additionally connected by hydraulic fracturing of bed, before isolation of hollow of operation well from hollow of horizontal shafts, filter is mounted in the latter, as well as porous oil-attracting hydro-repelling material.

EFFECT: higher efficiency and durability.

6 cl, 2 dwg, 1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes measuring volume and denseness of fresh oil in reservoir in case of even or balanced temperature and pressure. Combined sample of fresh oil is taken from pipeline during its draining and denseness of oil and bed water and ballast content is determined. Then mass of drained oil is determined with consideration of measured parameters. Prior to draining, fresh oil from reservoir is exposed until partial separation of bed water, and its denseness is measured. During draining of fresh oil, its denseness,, volumetric share of water therein, pressure and temperature are determined. Drained oil mass and percentage of ballast is determined from given mathematical expressions. Denseness of exposed bed water is measured on basis of sample, taken after exposure of fresh oil in reservoir. Denseness of exposed bed water is measured in its flow during draining from reservoir after exposure and before draining fresh oil. Volume of fresh oil in reservoir is measured continuously by its level and data from graduating table for reservoir. Draining of combined sample of fresh oil from pipeline during its draining is performed manually or automatically in case of constant kinetic condition. After exposure of fresh oil in reservoir point samples of fresh oil are taken, additional combined sample is made thereof and denseness of fresh oil, oil and bed water and ballast percentage is determined from it, and these parameters are used when evaluating precision of determining parameters of drained oil. Measurements of denseness, volumetric water share, pressure and temperature during draining of fresh oil in flow are performed periodically with averaging of current values of measured parameters for time interval, equal to period of change of parameters of fresh oil in reservoir. Mass of bed water MW is determined from given formula.

EFFECT: higher precision.

8 cl, 1 dwg

FIELD: mining industry.

SUBSTANCE: method includes compressing gas at compressor station to required feed pressure, and utilization of drop liquid, containing drops of compressor oil and gas, before gas-distributing substation with following pumping of gas into well. Utilization of drop liquid is performed via slanted cylindrical separator of centrifugal type and deep chemical cleaning block in form of two parallel-placed absorbers, operating alternately with replacement of processed absorbents. Separator and two absorbers are mounted at tank for collecting compressor oil.

EFFECT: higher efficiency.

2 dwg, 1 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes transporting hydrocarbon product along operation channel. Control of pressure changes along this channel is performed. If such change is present such debit of hydrocarbon product is set, which provides for destruction or decomposition of present natural gas hydrates and/or prevention of their forming. With this debit, to place of hydrates decomposition and/or prevention of their forming, alkali solution is fed with concentration 0.04-4.9% with "pH" greater than 10. Alkali solution is fed during time not less than time of pressure change along operation channel, as well as with flow and during time until achieving mass concentration of alkali in gas phase 10-15% of mass.

EFFECT: higher efficiency.

12 cl, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes full raising of cement in behind-pipe space up to mouth, sectioning wells by electro-isolating compounds from oil transporting system or bed pressure support system and use of cathode protection plant as cathode protection station with current controller. For each well time needed for completing cathode polarization of well is determined as well as time for well depolarization, during which potentials on well of cluster are lowered to minimal protective values. On each cluster well cyclic mode of cathode protection plant is performed: cathode polarization during completion of cathode well polarization and well depolarization during lowering potential on well to minimal protective values. During depolarization of one well cathode polarization of other cluster well is performed.

EFFECT: higher effectiveness.

1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: device has axial transmission and soft stripe support system. Axis connects electric engine to reducer and connected reducer and leading hub, by means of which transmission lines are actuated. After connection of driven hub and device for supporting pump bars, pump bar for actuating well oil pump can be connected. Leading hub can actuate transmission lines, including one connected to balancer, operating synchronously to operation of well oil pump in both directions. Also, device has base, corbel and platform, controller for controlling oil extraction process, transformer, frequency setting transformer, absolute values encoding means and braking tank. Said electric engine, reducer and leading and driven hubs are mounted on the platform. Controller, through setting frequency generator, functioning as main drive, is connected to electric engine. Controller is connected to encoding absolute values means, capable of displaying working conditions and receiving data about position and rotation angle of leading hub. Encoding means for absolute values and braking block compose a portion of device for determining movement and braking. Controller can contain central processing module, input/output module and liquid-crystal display. Controller can be connected to encoding extension means, immediately receiving data about angle, position and rotation speed of electric engine axis.

EFFECT: higher efficiency.

3 cl, 12 dwg, 1 ex

FIELD: oil-producing industry.

SUBSTANCE: the invention presents a method of purification of the underground potable water at a crude production. The method provides for limitation of traffic of pollutions by construction of boreholes and pumping in of solutions of reagents. Along the contour of the site of possible pollution they make a net of boreholes with the a controlled inter-pipe and drill string-borehole annulue space - a compound - boreholes, the distance between which and a number of steps is chosen depending on porosity and permeability of rocks. The steps of the compound-boreholes are placed perpendicularly to the traffic route of the natural stream of the underground potable water, and a pumping in of the solutions of reagents is made through annulue space and inter-pipe space of compounds - holes simultaneously with a crude and a gas production from a pay. The technical result is a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.

EFFECT: the invention ensures a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.

1 dwg

FIELD: gas extractive industry.

SUBSTANCE: method includes extraction of resource by mechanical drilling and extraction of slurry and rock pieces through well. Gas extraction is performed by horizontal drilling with washing and back expansion, with concurrent cleaning and separation of fresh extracted mixture and accumulation of gas. Delivery of expander of ultra-large working size to expansion place is performed through well subjected for backward expansion. Pressure, temperature and composition of washing liquid is adjusted in such a way, that free natural gas, freed during mechanical drilling, was dissolved in drilling mud and separated from it only after passing of separator through rotating preventer. Expander in form of rocker with cutters is used, expanding well diameter up to ten meters and more.

EFFECT: higher efficiency.

2 cl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes insertion of compound of foam-forming and gas-forming substances, dissolving these in bed water, and forming of gas and foam and replacement of well liquid with foam, while as foam-forming substance sulphonole is used with sulphamine acid as reaction initiator. Liquid is extracted in two stages: at first stage upper portion of liquid column is piston-effected, at second stage water-soluble foam-forming substance is injected into well with foam stabilizer and reaction initiator, as well as gas-forming substance, while water-soluble foam-forming and gas-forming substances are inserted into well directly after piston-effecting, and water-soluble foam-forming substance additionally has surfactants. Mass of foam-forming substance is determined from conditions: Mff=(0.005-0.01)KMw, where K - component coefficient, Mw - mass of water removed from the well. As gas-forming substance, ammonium carbonate is used in amount 40-50 kg for 100 linear meters of water column in a well. Piston-effecting is performed with productiveness in no less than two times greater than well debit.

EFFECT: higher efficiency.

4 cl, 1 ex, 2 dwg

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