Method for horizontal well operation

FIELD: oil and gas industry.

SUBSTANCE: according to the method, a well is operated until water intrusion of production. A pipe string is lowered into a horizontal part of the well, and the annular space is filled with a cement mortar, the cement mortar is squeezed into a borehole environment via the pipe string, and squeezing is stopped, when pressures in the pipe string and the annular space are balanced, the process exposure is carried out for cement setting and hardening, the pipe string is cleaned from cement remains. The process exposure is carried out for at least 3 months with periodical research of the borehole environment with a pulse neutron generator. The process exposure is stopped after readings of the pulse neutron generator are stabilised. Using the readings of the pulse neutron generator, oil zones of a horizontal bore are identified. Oil zones are perforated from the remote end of the horizontal bore to the wellhead. Oil is withdrawn until water intrusion into a zone, the watered zone is isolated, and oil withdrawal continues.

EFFECT: higher efficiency of water inflow isolation in a horizontal bore of a producing well due to increased reliability of a blocking effect with controlled directed impact at zones of bed water inflow.

1 ex

 

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

There is a method of isolation of the water in a horizontal or tilted plots trunks wells, in accordance with which derive from a well pumping equipment, go down the column tubing (tubing) into the well, pumped through tubing waterproofing solution hardening properties. Opposite the intervals vodopodayuschih layers form an impermeable crust, which as a waterproofing solution using modified cement mortar polyvinyl acetate reagent in the amount of 0.25-0.5% by weight by weight of cement, to the extent that the filling of the annular open hole horizontal section through the drill pipe lowered to the bottom of the horizontal section of the wellbore, and aged for 2-3 hours with subsequent leaching from the annulus direct or reverse circulation after curing of the cement (RF Patent No. 2273722, publ. 10.04.2006).

The method does not provide reliable isolation of the water.

The closest to the proposed invention the technical essence is a means of isolating the water in a horizontal stem extract is her well, including the descent of the column of pipes, pumping high-viscosity hydrophobic liquid in water shut-off interval of the formation (RF Patent №2114990, publ. 10.07.1998 - prototype).

This method of isolation of water in the horizontal section has a number of disadvantages, in particular its effectiveness depends entirely on the exact instrumental preliminary determination of water shut-off interval, which is a serious technical problem; its effectiveness is reduced if there are two or more inflow intervals along the length of the horizontal wellbore; the need to descend into the well and the installation of expensive metal profile peregrinates (after reinjection hydrophobic high-viscosity fluid) significantly reduces the efficiency and increases the cost of the entire operation.

The technical problem to be solved in the invention, is to increase the efficiency of isolation of water in a horizontal wellbore of the production well by increasing the reliability of the blocking effect with adjustable directional impact on the inflow intervals of the formation.

The task is solved in that in the method of operation of horizontal wells, including well operation until the water cut in crude production, the descent of the tubing, the injection of the insulating material in the water shut-off interval of the formation, according to the invention after the descent to the h-pipe in the horizontal part of the well fill the annulus with cement mortar, spend the displacement of the cement slurry in the bottomhole zone through the string of pipe, stop displacement when pressure equalization in the string of pipe and turns, conduct technology shutter speed for setting and hardening of cement, clean the string of pipe from the remnants of cement, conduct technology exposure for at least 3 months with periodic study of the near-wellbore pulsed neutron generator, stop processing after exposure stabilise pulsed neutron generator, according to the testimony of a pulsed neutron generator determine the oil-saturated interval of the horizontal wellbore, perforined net pay intervals from the far end of the horizontal shaft to the mouth, are the selection of oil to the watering interval, perform the isolation of Obvodnogo interval and continued selection oil.

The invention

When flooding of oil wells with a horizontal shaft having difficulty finding and isolation zones of the water. In the proposed method solves the problem of increasing the efficiency of isolation of water in a horizontal wellbore of the production well by increasing the reliability of the blocking effect with adjustable directional impact on the inflow intervals of the formation. The problem is solved as follows.

When the operation is then horizontal oil wells are operating well before the water cut in crude production. Stop the well. Raise underground equipment. Down in the horizontal uncased well bore of the string of pipe to the far end of the well and pumped through the column pipe with an open annular valve at the wellhead cement to fill the annulus of the horizontal part of the well. Close the annular valve and spend the displacement of the cement slurry in the bottomhole zone through the string of pipe. Stop displacement when pressure equalization in the string of pipe and turns, which indicates the filling of highly watered part of the bottomhole cement mortar. Conduct technology shutter speed for setting and hardening of cement, Clean the string of pipe from the remnants of cement with drilling in the internal space of the column of pipes and leaching drilled cement. Conduct technology exposure for at least 3 months with periodic study of the near-wellbore pulsed neutron generator. Stop processing after exposure stabilise pulsed neutron generator. Technological endurance is necessary for the dissolution of the zone of penetration of the mud filtrate in the vicinity of the space of the manifold. Experience shows that for the dissolution of the penetration zone for terrigena the collectors required time period is about 3 months, and for carbonate reservoirs - 6 months. According to the testimony of a pulsed neutron generator to determine oil and water producing intervals of the horizontal wellbore. Perforined oil-bearing interval at the far end of the horizontal shaft. Lead the selection of oil to the watering interval. Spend isolation of Obvodnogo interval setting cement in the well. Perforined the following oil-saturated interval from the set of the cement bridge, take the oil to the watering interval. Isolate the interval setting of the cement bridge. Loop perforation of oil-saturated interval from the cement plug, oil extraction to irrigation and the production of a cement bridge continue to develop oil reserves.

To assess the nature of the saturation of the reservoir of productive horizons in cased wells can be used neutron methods. The most effective of neutron methods are pulsed, major modifications which are divided into pulsed neutron gamma-method (IGM), pulsed neutron-neutron method for thermal neutrons (INNM) and pulsed neutron gamma spectrometric method (so-called C/O logging). The delivery of the logging tool in the interval of the horizontal part of the well to produce rigid logging cable or with p the power downhole tractors.

As a result of increasing the efficiency of isolation of water in a horizontal wellbore of the production well. The produced products are oil-saturated interval has a waterless operation period, which is not observed when using known methods. Increases the reliability of the blocking effect of the water due to the cementing of the annular space in the interval of the horizontal wellbore. Studies using pulsed neutron generator allows you to identify the saturated zone and spend adjustable directional impact on the inflow intervals of the formation perforation intervals and selection of oil.

Specific example

Operated horizontal oil wells cased vertical part and uncased horizontal barrel length 140 m in carbonate oil reservoir tournaisian age at depths from 1310 to 1450 m Diameter horizontal wellbore is 144 mm From the well are the selection of oil with a flow rate of 15 m3/day for 3 years up to 99% water cut in crude production. Stop production, raise from a well deep equipment, pulled down into the horizontal wellbore on tubing (tubing) the Pappus of the tubing with a diameter of 114 mm in the interval 1240-1450 m Pappus in the upper part with abgene left sub and non-return valve. Prepare estimated quantity of cement and pumped into the tubing string. Next, cement is forced over the Pappus estimated displacement and squeezing the liquid. The last portion of squeezing liquid (about 100 litres) is not forced into the tubing string to prevent diluted cement for Pappus. Release the pressure in the tubing string. No overflow of fluid from the tubing string indicates the tightness of the check valve meetings. Rotation of the tubing string to the right turn left sub from meetings. Define disconnecting the weight indicator. Raise the tubing of 1.5-2.0 m and backwashing to remove the excess cement, while preventing the loss of drilling fluid to control the process. Raise the drill pipe at 200-300 m above the head of the detachment, the well cover and leave for RFQ (wait hardening of cement). RFQ 48 hours. After 24 hours permitted to lift the remaining tubing and sub at the wellhead.

Cemented the Pappus are a chisel with a diameter of 100 mm, washed and cleaned the string of pipe from the remnants of the cement. Conduct technology exposure for 6 months with periodic study of the near-wellbore pulsed neutron generator. Readings pulsed neutron generator modification Inoc on BP is like the life of thermal neutrons at the beginning of the exposure in the oil-bearing intervals range from 360 to 390 μs, in the middle of extracts from 320 to 350 μs, at the end of excerpts from 400 to 450 μs. Final readings do not change within 1 month, indicating a stabilization of the readings pulsed neutron generator. According to the testimony of a pulsed neutron generator to determine net pay intervals horizontal wellbore in which the readings range from 400 to 450 μs. The final readings in water-saturated intervals range from 190 to 260 µs. Perforined oil-saturated interval length of 36 m at the far end of the horizontal shaft. Lead the selection of oil production rate of 14 m3/day and initial water content of 65% to irrigation of products produced 99%. Stop production. Spend isolation of Obvodnogo interval setting cement into the well from the far end to the overlap of Obvodnogo interval. Perforined the following oil-saturated interval length 42 m from the set of the cement bridge, take the oil to the watering interval. Isolate the interval setting of the cement bridge. Cycles perforation of oil-saturated interval, selection of oil to the water and placing cement bridge continue to develop oil reserves.

In the result it is possible to get additional 15 thousand tons of oil. Overflows of water from isolated intervals in perforated intervals are not observed. The research applied the eat pulsed neutron generator allows you to identify the saturated zone and spend adjustable directional impact on the inflow intervals of the formation perforation intervals and selection of oil.

Application of the proposed method can improve the efficiency of isolation of water in a horizontal wellbore of the production well by increasing the reliability of the blocking effect with adjustable directional impact on the inflow intervals of the formation.

A method of operating horizontal wells, including well operation until the water cut in crude production, the descent of the tubing, the injection of the insulating material in the water shut-off interval of the reservoir, characterized in that after the descent of the tubing in the horizontal part of the well fill the annulus with cement mortar, carry out the displacement of the cement slurry in the bottomhole zone through the string of pipe, stop displacement when pressure equalization in the string of pipe and turns, conduct technology shutter speed for setting and hardening of cement, clean the string of pipe from the remnants of cement, conduct technology exposure for at least 3 months with periodic study of the near-wellbore pulsed neutron generator, stop technological exposure after stabilization of the readings pulsed neutron generator, according to the testimony of a pulsed neutron generator determine the oil-saturated interval of the horizontal wellbore, perforined net pay intervals from the far end of the Hori is tal barrel to the mouth, lead the selection of oil to the watering interval, perform the isolation of Obvodnogo interval and the continuation of oil extraction.



 

Same patents:

FIELD: gas and oil production.

SUBSTANCE: here is disclosed procedure for treatment of borehole of well entering underground reservoir. The procedure consists in placement of composition of sealant with polymer containing reverse emulsion in borehole of the well to prevent absorption of working substance in the underground reservoir during its placement in the borehole. According to the procedure polymer containing reverse emulsion is dehydrated to content of 10% of water before its placement in the borehole of the well. Composition of sealant for realisation of this procedure includes polymer containing reverse emulsion. The latter includes particles with dimension in the range from approximately 0.01 micron to approximately 30 microns. Also, polymer containing reverse emulsion is produced with its dehydration to content of 10% of water. The invention is developed in dependent clauses of the patent claim.

EFFECT: raised degree of plugging large areas of circulation loss in borehole of well.

21 cl, 9 ex, 16 tbl, 5 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure for development of multi-pay oil deposit consists in casing string opening, in lowering packer on oil-well tubing (OWT), in positioning packer between reservoirs, in pumping hardening back-filling solution and in its conditioning. Back-filling solution is preliminary pumped and pressurised into a lower watered reservoir. Upon back-filling solution hardening in the reservoir the casing string is opened above the lower reservoir. Packer is set above interval of casing string perforation. A connecting rod receiving fluid from the watered reservoir by means of the pump is arranged at a lower end of the OWT string.

EFFECT: raised efficiency of procedure for development of multi-pay oil deposit due to maintaining operational mode of producer and elimination of filtration of reservoir water through annular space to upper payout reservoir of well thus increasing well operation period; reduced well production watering and increased reservoir recovery.

1 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure consists in drilling-out with producers crossing impermeable natural inter-layers in pay-out bed, in lowering casing string with successive perforation of pay-out bed, in analysis of oil-and-water saturation and intervals of their bedding, in analysis of dimension of impermeable natural interlayer and in making barriers out of insulating composition separating water-saturated zones of bed from oil-saturated zones. By results of analysis there is determined thickness of the oil-saturated zone of the bed. If thickness of oil-saturated zone of the bed exceeds 4 metres, part of the casing string is cut out in the interval above lower perforation orifices of the oil-saturated zone of the bed up to a bottomhole of the well. Borehole is enlarged in this interval and is filled with isolating composition corresponding to cement grout. When thickness of the oil-saturated zone of the bed is below 4 metres, then a part of casing string is cut out from the roof of the impermeable natural interlayer to the bottomhole of the well. The borehole of the well is enlarged in this interval and is filled with isolating composition. There is formed a packer by introduction into the bottomhole zone of the oil-saturated zone of the well bed.

EFFECT: upgraded reliability and efficiency of oil deposits development by increased strength of isolation of water-saturated zone of bed.

2 cl, 4 dwg

FIELD: oil and gas production.

SUBSTANCE: sand plug is washed down to lower perforation holes of existing interval of perforation, and buckling of flow string is eliminated. Then tail of smaller diametre pipes is lowered in inner cavity of flow string to head of washed sand plug, with arrangement of tail head by 20 m higher than reservoir roof, which is cemented by mortar, leaving cement sleeve in inner cavity of tail down to depth of upper holes of existing perforation interval. After cement hardening, tail and flow string are perforated in interval of above dehydrated part of reservoir to its roof. Lifting string is lowered into well, gas inflow is caused from reservoir, and well is flared, gas dynamics research is carried out, and well is put in operation. At the same time cement mortar consists of portland cement, superplasticiser C-3, polyvinyl alcohol and polypropylene fibre.

EFFECT: liquidation of reservoir water inflow and elimination of flow string buckling conditions, provision of water-free operation of wells.

3 dwg

FIELD: oil and gas production.

SUBSTANCE: sand plug is washed down to lower perforation holes of existing interval of perforation, and buckling of flow string is eliminated. Then water-insulation composition is injected into existing interval of perforation, is pushed into reservoir, creating a water-insulation screen, and displacing reservoir water in depth of reservoir by displacement fluid. Then tail of smaller diametre pipes is lowered in inner cavity of flow string to head of washed sand plug, with arrangement of tail head by 20 m higher than reservoir roof, which is cemented by mortar, leaving cement sleeve in inner cavity of tail down to depth of 1-2 m higher than current gas-water contact and higher than upper holes of existing perforation interval. As cement hardening waiting time elapses, two strings, tail and operating strings are perforated for operation, in interval above the cement sleeve to roof of reservoir. Then lifting string is lowered in well by 1-2 m higher than the tail head. Gas flow is caused from reservoir, and well is flared. Gas dynamics research is carried out, and the well is commissioned. At the same time water-insulation composition is represented by liquid glass, displacement fluid - by methanol, cement mortar is a composition that consists of portland cement, superplasticiser C-3, polyvinyl alcohol and polypropylene fibre.

EFFECT: liquidation of reservoir water inflow and elimination of flow string buckling conditions, provision of water-free operation of wells and getting planned volumes of gas production.

1 ex, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: in well operation method involving pumping of composite material to the formation to the interval below oil-water contact, process exposure and operation of the well, there preliminarily performed is forcing of water from inter-tube space with oil to the interval below oil-water contact; in order to prepare composite material the thickener is filled to inter-tube space of the well on the basis of 1-5 kg per 1 m3 of oil located in inter-tube space, and mixing of thickener with oil in inter-tube space by oil circulation with thickener via tubing string and inter-tube space, and pumping of solution of oil and thickener from inter-tube space to the interval below oil-water contact is performed in pulse mode under pressure exceeding hydrostatic one by not more than 10%; at that after process exposure the well operation is performed during the first 5-15 days in moderate mode with flow rate of not more than 50% of the operating one.

EFFECT: reducing associated water production.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves use of the well and flow column lowered to it, pumping to productive formation of liquid or liquid-gas mixture prepared by using the mixing device the discharge of which is interconnected with flow column, and low and high pressure chambers - with gas and/or liquid sources. According to invention, the pumping of liquid or liquid-gas mixture is performed periodically to the watered-out interval of productive formation. On bottom hole of the well, in annular space between flow column and casing string in the interval above and within the limits of the watered-out part of productive formation there installed are not less than two packers. Annular space in the packer installation interval is filled with non-newtonian fluid. Two circulation valves are installed in flow column. One is installed in watered-out interval of the formation, and the other one - above the upper packer.

EFFECT: increasing operating efficiency of wells at hydrocarbon deposits, the operation of which is complicated with water penetration into deposits.

5 cl, 1 dwg

FIELD: oil-and-gas production.

SUBSTANCE: it is implemented preparation of injection well in insulated area by path close to roof cladding configuration of insulated area of stratum. Then it is pumped into it solution of foam maker with following feeding of gas for foaming. It is defined minimal horizontal lateral dimension of screen from conditions of filtration through the screen of gas and/ or water considering pressure gradient at the boundaries of screen at the period equal to period maximal pumping into gas storage or maximal permissible withdrawal of gas from particular storage. Minimal vertical dimension if screen is considered equal to value which is not less than maximal dimension from roof of formation up to gas-water contact in the area of screen creation. In preference it is implemented injection well making, path of which is normal to vector of average speed of formation fluid in isolated area of stratum. Preferentially it is also implemented making of inclined and/or horizontal injection well.

EFFECT: reliability growth of operating characteristics of screen, reduction of foam former consumption and gas amount, used for foaming and consumptions for wells drilling.

3 cl, 3 tbl, 1 ex, 3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relate to oil exploration industry and can be used for formation water in-flow limitation. Composition producing method includes mixing of a water solution with carbon black, at that preliminary disperse carbon black in the methyl cellulose diluted water solution, at component ratio wt % : carbon black 15.0, methyl cellulose 0.05, the rest is water. Then mix received concentrated suspension with methyl cellulose water solution and carbamide at the following component ratio wt %: methyl cellulose 0.5-2.0, carbamide 2.0-20.0, carbon black 0.5-5.0, the rest is water. The composition of oil recovery rate increase characterised with the mentioned above method.

EFFECT: oil wells oil recovery rate increase due to reservoir physico-chemical treatment.

2 cl, 1 tbl, 24 ex

FIELD: oil-and-gas industry.

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

EFFECT: production wells water inflow insulation efficiency increase.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes pumping of a borehole fluid with a screw pump by means of a string of hollow rods placed inside oil well tubing - OWT with supply of a reagent to reduce viscosity of the borehole fluid. According to the invention, in process of pumping the borehole fluid flow is divided into two parts. One part of this flow is sent to a flow line, and the other one - into a line of return to the well bore. For this purpose the upper end of the hollow rod string is equipped with a flow separator of double-throttle type, the lower end of this string is equipped with a perforated coupling, and inside this string is equipped with a water-jet coupling. At the same time the reagent to reduce viscosity of the borehole fluid is supplied into OWT or into the hollow rod string, is mixed there with the borehole fluid and sent via the water-jet coupling and partially via the perforated coupling into the hollow rod string or OWT. The device comprises a screw pump, a hollow rod string, placed inside of oil well tubing, a unit for reagent supply to reduce viscosity of the borehole fluid, into a well with an injection line, a line of return to the well bore. According to the invention, the device is equipped with a borehole fluid flow separator of double-throttle type, which is installed on the upper end of the hollow rod string, the lower end of which is equipped with a perforated coupling, and inside this string is equipped with a water-jet coupling to suck the reagent to reduce viscosity of the borehole fluid. At the same time the borehole fluid flow separator is made with two conical cavities, which hold a stem with two cones capable of displacement and two bends for distribution of the borehole fluid into a flow line and a line of return to the well bore. The injection line is capable of supplying the reagent to reduce viscosity of the borehole fluid into OWT or the hollow rod string.

EFFECT: higher efficiency of oil production at a later stage of deposit development due to reduction of quantity of the required equipment for pumping of the borehole fluid and reduction of reagent losses during its pumping into a well to reduce viscosity of the borehole fluid.

2 cl, 3 dwg

Storage hold // 2447263

FIELD: mining.

SUBSTANCE: device comprises a casing made in the form of a cylindrical sleeve, consisting of pipes connected with couplings. The lower pipe of the casing ends with a plug. The upper pipe of the casing is fixed in a support, in the lower part of which there are figured conical slots provided for free passage of liquid and evenly arranged along the support circumference. The inner cavity of the support is made in the form of a funnel. To provide for fixation of the support, its lower end is made as stepped, resting with a circular site against a base of a transition section in a stepped well.

EFFECT: improved efficiency of well operation, increased overhaul period, reduced operational costs.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a cylindrical vessel and a plunger with a valve in a cylindrical vessel, installed as capable of reciprocal motion. The cylindrical vessel in the upper part is connected with a striking valve, and in its lower part it is connected to a perforated nozzle, which in its turn is connected to a packer, and the packer - to a tail. Under the plunger valve there is a valve holder, to which a stem is fixed at the bottom. In the perforated nozzle below perforation holes there is a valve device comprising a casing, a valve seat, a plate valve with a stem, springs and a plate holder. The stem fixed in the holder and the stem of the plate valve are installed as capable of contact.

EFFECT: invention provides for the possibility to reduce sand seepage under impact, to control value of depression impact and to realise impact whenever necessary.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to underground processing of formations. Proposed method comprises preparing fluid for processing formation containing water and copolymer reducing friction consisting of acrylamide in amount of 80 wt % to 90 wt % and acrylic acid in amount of 10 wt % to 20 wt %, and feeding it into underground formation. It comprises also preparing copolymer oil emulsion containing water, fluid non-miscible with water and aforesaid copolymer, combining emulsion with additional water for producing water fluid for formation processing, inverting emulsion so that said copolymer is released into water fluid to be forced into underground formation. proposed method comprises preparing copolymer oil emulsion containing water, fluid non-miscible with water containing mix of paraffin hydrocarbons and naphthenic hydrocarbons, emulsifier containing diethanolamide of fat acids of tall oil, monooleat of sorbite polyoxyethylene and sorbite monooleat, above specified copolymer and ammonium salt, 4-metoxyphenol and etoxylated alcohol C12-C16, combining said emulsion with additional water, inverting said emulsion so that copolymer reducing friction is forced into formation.

EFFECT: higher efficiency of reducing friction.

23 cl, 1 ex, 3 tbl

FIELD: oil and gas industry.

SUBSTANCE: oil well development device is equipped with hollow pump out plugs, stock, pump out cone and packer. Packer consists of sealing element, housing that is made from above so that it can interact with sealing element, and from the inside it is put with possibility of longitudinal upward movement on the stock equipped on its outer surface with a bushing that is arranged above sealing element. Bushing is rigidly connected to the stock and has the possibility of being supported from above on sealing element that is arranged outside the stock. Housing is made in the form of a downward converging cone. On stock between housing and pump out cone there provided is shaped slot in the form of short and long longitudinal sections connected to each other by means of shaped section. Below pump out cone there located is hollow shell with collet centraliser from above, which is connected by means of hollow rod to pump out cone so that distance between lower edge of cone and upper edge of collet centraliser is not less than plug diameter. Pinion is installed on the end of hollow rod. On the stock opposite the shaped slot there arranged is cage with inward pressed slips outward spring-loaded with centralisers and guide pin arranged in shaped slot with possibility of being moved along shaped slot together with the cage. At that, slips have the possibility of interacting from inside with the cone at movement of the pin upwards along long longitudinal section of shaped slot together with cage - working position, and interruption of interaction when the pin is located in short longitudinal section of shaped slot - transport position.

EFFECT: improvement of the device design.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of high-viscosity oil and bitumen deposit involves drilling and arrangement at least of two vertical wells with further secondary opening in them of upper and lower parts of productive formation, lowering to each well of tubing string with packer and separation of opening intervals with packer in production string, cyclic steam pumping to the formation through upper opening interval and extraction of formation fluid through lower opening interval. Between wells there drilled and arranged at equal distance is additional vertical well so that constant extraction of formation fluid from secondary opened lower part of productive formation and cutting of branch holes in upper part of productive formation is provided. Branch holes are made in inclined direction from roof to bottom of productive formation in the direction of peripheral wells with distance of inclined section, which is determined with linear size of its horizontal projection within the limits of 5-95% of the shortest distance to peripheral wells. In branch holes there separately provided is constant steam pumping to lower part of productive formation and steam pumping to upper part of productive formation when steam pumping to peripheral wells is stopped. At that, from peripheral wells via tubing string there performed is extraction of formation fluid in constant mode, and steam pumping to tube space of peripheral wells is stopped at water flooding of formation fluid to 95-97% and steam pumping is renewed when water flooding of formation fluid is decreased to 85%.

EFFECT: intensifying formation fluid inflow to wells at development of high-viscosity oil and bitumen deposit which is non-homogeneous as per the productive formation section, especially at its early stage.

1 tbl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: detection system of acoustic signals includes delivery pipe string for supply of heated fluid medium that generates acoustic signal, acoustic detector and acoustic signal analyser. Acoustic detector detects acoustic signal, and acoustic signal analyser interprets the detected acoustic signal. At that, delivery pipe string includes the first oscillatory device providing the supply of fluid medium flow to the well shaft in oscillating mode, and the above acoustic signal is created with pressure oscillations in fluid medium.

EFFECT: receiving the information on the system state.

15 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: inclined shafts of curved shape are drilled from vertical wells; cyclic heat treatment of formation with steam stimulation is performed, and then, extraction of formation fluids through production wells with areal stimulation of formation through injection wells is performed. According to the invention, vertical well is drilled from the mouth to the working face located below the roof of formation; from the above working face there drilled are at least 4 inclined curved shafts directed towards the formation bottom. Those shafts are drilled along spatial trajectories representing not more than a quarter of circle or parable, which lie in two vertical mutually perpendicular planes. At that, shafts are perforated throughout the length and ended in plane of horizontal production well which lies below the working face of vertical well and passes through the centre and parallel to two sides of the imaginary square that is formed with ends of inclined curved shafts. At that, as a result of hydrodynamic interaction of system of inclined injection shafts with horizontal production well there formed is formation dome drain zone for development under it of high-viscosity oils and bitumens; after that, horizontal production well is shut off and pumping of working medium to vertical well and inclined shafts is stopped.

EFFECT: increasing production rate in thick non-homogeneous formations with high-viscosity oils and bitumens.

2 cl, 2 ex, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of high-viscosity oil and bitumen deposit involves well construction, opening of upper and lower well intervals within the formation limits, breakdown of perforation intervals in the well, cyclic pumping of the working medium in the form of steam to the formation through upper opening interval and extraction of the formation product through lower opening interval. Distance between well opening intervals is at least 5 m. Formation product is extracted constantly. Pumping of working medium is stopped when the temperature of the formation product extracted from lower interval increases to the temperature equal to 70-90% of the pumped working agent temperature. Pumping of working medium is renewed when flow rate of the extracted product decreased to unprofitable value. At that, at the distance of 50-100 m from the existing well there built is an additional well similar to the first one, which is used for constant pumping of working medium from its upper opening interval till hydrodynamic link to the first well is created; after that, lower opening interval of additional well is changed over for extraction of product, and upper interval is changed over for cyclic pumping of working medium during interruption of working medium pumping in the first well.

EFFECT: intensifying the product flow rate at early stage of development with simultaneous cheapening of the method.

1 tbl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves extraction of product from formation with water-oil mixture in forced mode, separation of product into oil and water and pumping of separated water to water receiving formation. According to the invention, drilling of lower water receiving formation is performed; device in the form of lower pump and upper pump is lowered into the well; inlet system of the above device is made in the form of a pipe between casing pipe and pipe string, which provides total flow velocity at water and oil extraction, which is less than floating-up velocity of oil in water for separation of product in well into water and oil. Separated water is pumped with lower pump to water receiving formation; at that, pumps are chosen with the capacity corresponding to formation product water content and total capacity providing the forced product extraction from the formation with water-oil mixture. Device includes pumps with drives, which have the possibility of being located in series on pipe string in the well and have inlet and outlet devices, and packer having the possibility of being located between formations in the well, the upper one of which has water-oil mixture, and lower one is intended to receive water. Inlet device of upper pump is made in the form of cylindrical capacity with side inlet hole interconnected with formation containing water-oil mixture, and outlet device of this pump is made in the form of valve unit passing the oil to pipe string. Outlet device of lower pump is made in the form of channel with water delivery valve to the formation intended to receive water, and inlet device is made in the form of channel with suction valve for pumping of settled water to the pump. At that, annular section area outside the capacity is chosen so that maximum flow velocity of water-oil mixture downstream of this section exceeds floating-up velocity of oil in water. At that, capacity is made in the form of a pipe located between casing pipe and pipe string with inner annular section area providing the total flow velocity at water extraction with lower pump and oil extraction with upper pump, which is lower than floating-up velocity of oil in water at intense extraction in the capacity. Side hole of the capacity is located at least 1 m below bottom of formation containing water-oil mixture and inlet of upper pump. At that, inlet device of lower pump is interconnected with the capacity at least 1 m below side hole. Capacity is closed from below with a plug with a connection pipe interconnected with outlet device of lower pump and with borehole space.

EFFECT: increasing oil recovery owing to increasing reservoir coverage coefficient at water flooding at advanced stage of development, and reducing material costs.

3 cl, 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

Up!