Well operation method

FIELD: oil and gas industry.

SUBSTANCE: method involves installation of oil-well tubing string with well sucker-rod pump in a well. Additionally, the string features a liner with filter, heating cable along external surface from wellhead to the well sucker-rod pump, capillary well pipeline from wellhead to a depth below the well sucker-rod pump, entering inner space of the liner. Well operation involves simultaneous product extraction through oil-well tubing string by the well sucker-rod pump. Electric current runs over the heating cable. Mix of Intat asphaltene, resin and paraffin sediment solvent and Rekod demulsifier is injected via capillary well pipeline. Demulsifier to solvent ratio is (1:18)-(1:22). Cable with maximum heating temperature up to 105°C and maximum power up to 60 kWh is used as the heating cable.

EFFECT: enhanced efficiency of viscous oil emulsion production.

1 ex, 1 dwg

 

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

The known method of operation of the well, is described in the device for transporting the instrument in a borehole, comprising a housing with retaining elements, limit switch and actuator screw and nut fixed thereto the support element, wherein the device is provided with a spring, a ring, and the nut of the actuator is made Rethimno, spring loaded and covered by the ring, installed with the possibility of interaction when moving with stroke limiter [USSR Author's certificate No. 1465549, publ. 15.03.1989].

The closest to the proposed invention the technical essence is a method of operating the wells, which consists in the fact that is run into the well the pen with a jumper, perforated pipe, the bottom of the column of pump-compressor pipes calculation of length equal to the distance from the location of the downhole pump to a predetermined interval in a lateral wellbore, the nozzle with side hole and the plug, the downhole end of the tubing is passed through a side opening of the nozzle, is secured in the piston with the inner channel and the side opening and having an outer diameter, providing a gap of 3-4 mm between the piston and the inner surface of the bottom of the column on�based compressor pipes for the flow of process fluid, when the compound forming the communication of the internal space of downhole tubing and the inner channel and the side openings in the piston, at the lower column of pump-compressor pipes pumped fluid which moves the piston and with it the downhole tubing all the way into the jumper feather, fastened to the cap filter, submersible pump and the top of the column of pump-compressor pipes, down the layout into the well with the placement of the pen, the perforated pipe and the bottom of the column tubing in a lateral wellbore, during the descent of the downhole tubing is fixed on the outer surface of the top of the column of pump-compressor pipes, through deep pump through the top of the column of pump-compressor pipes take away the oil using downhole tubing, the inner channel of the piston, the side opening in the piston, the clearance between the piston and the bottom wall of the column tubing and the perforated pipe is pumped at a set interval side-tracking process liquid. As process liquid used scale inhibitor (patent RF №2461700, publ. 20.09.2012 - prototype).

A common disadvantage of the known technical solutions is the inability to produce viscous oil emulsion.

In the proposed invention solves the problem of production �askoy oil emulsion.

The problem is solved by the method of operation of the borehole, whereby the borehole is equipped with a column tubing with a sucker rod pump, with the shank with filter, with a heating cable on the outer surface of the column tubing from the mouth to the sucker rod pump downhole capillary tubing on the outer surface of the column tubing from the mouth to the depths of the lower sucker rod pump with the entrance to the inner cavity of the shank, in the operation of wells simultaneously selected sheet products on a column of pump-compressor pipes by means of a sucker rod pump, heating cable, electric current is passed, but capillary downhole tubing pump solvent mixture asphaltoresinparaffin deposits "Intat" and demulsifier "REKOD", the ratio of demulsifier and solvent take(1:18)-(1:22), and as the heating cable using a cable with a maximum heating temperature up to 105°C and a maximum power up to 60 kW·h.

Summary of the invention

In the operation of wells producing viscous oil emulsion with a dynamic viscosity of about 20000-25000 MPa·s, there is a periodic hang rod string. To resume service� produce cycle rod string, reducing the number of revolutions of the motor, however, the desired result is not brings - rod column hangs. By adding a solvent oil in the annulus with the study of the closed circulation manages to slightly increase the liquid, but the effect is minimal.

To ensure the possibility to obtain a viscous oil emulsion according to the suggested method the well is equipped with a column tubing with a sucker rod pump, with the shank with filter, with a heating cable on the outer surface of the column tubing from the mouth to the sucker rod pump downhole capillary tubing on the outer surface of the column tubing from the mouth to the depths of the lower sucker rod pump with the entrance to the inner cavity of the shank.

Fig. 1 shows the layout used.

Fig. 1 the following notation: 1 - operational column, 2 - column tubing, a 3-conductor cable, 4 - capillary tubing, 5 - sucker rod pump, 6 - shaft, 7 - tube with a hole to enter the capillary tubing, 8 - filter 9 - nozzle.

In the operation of wells simultaneously selected sheet product as a viscous oil emulsion on a column of pump-compressor�ornago pipe 2 by means of a sucker rod pump 5, on the heating cable 3 electric current is passed and heated sheet products inside the column tubing 2, and downhole capillary conduit 4 is pumped to the solvent mixture asphaltoresinparaffin deposits "Intat" and demulsifier "Record" and put it into the inner cavity of the shank 6 of the lower sucker rod pump 5.

The entrance to the inner cavity of the shank downhole capillary tubing perform below a sucker rod pump at a depth sufficient for complete dissolution in oil emulsion solvent mixture asphaltoresinparaffin deposits "Intat" and demulsifier "Record" and maximum reduce the viscosity of the oil emulsion when lifting products produced from the entrance to the inner cavity of the shank to the sucker rod pump.

The ratio of solvent asphaltoresinparaffin deposits "Intat" and demulsifier "Record" in the mixture depends on the viscosity of oil in oil emulsion, the water content and the amount of asphaltoresinparaffin components in the oil, the temperature in the well and the intensity of the heat cable. The ratio for each well selected empirically. For oil emulsion with a viscosity of about 28000 MPa·s average solvent consumption "Intat" is 3 l/m3emulsion, and dealight�RA "REKOD" - about 150 g/m3i.e. 140 liters of solvent "Intat" accounts for about 7 l of demulsifier "Record".

The ratio of demulsifier "Record" and solvent "Intat" is(1:18)-(1:22), optimally 1:20. Optimum specific consumption of solvent "Intat" with the addition of demulsifier "Record" is 3-5 liters per 1 m3downhole products.

Solvent "Intat" issued by TU 2458-187-83459339-2009, is a composition based on nonionic block copolymer of ethylene oxide and propylene (active basis) in an organic solvent, is a homogeneous liquid from light brown to dark brown in color. Originally designed to remove asphaltoresinparaffin deposits from oil wells and bottomhole zone of the formation.

Reagent "Record" issued by TU 2458-004-48680808 OP 00 am. 1-5. Reagent "REKOD" - transparent liquid from colorless to light brown in color. Is a water-soluble demulsifier. Originally intended for destruction of the high viscosity of water-oil emulsions with a high content of resins and waxes.

Capillary downhole tubing is a tube with an inner diameter of about 5 mm.

As the heating cable using a cable with a maximum temperature of about 100-105°C and a maximum power �about 60 kWh.

An example of a specific implementation

Well equipped with the arrangement according to Fig. 1. Pull the sucker rod pump 275-THM on the depth of 900 m in the column of pump-compressor pipes with a diameter of 89 mm, the shank of the tubing with a diameter of 89 mm with filter sucker rod pump with sampling at depth 1538 m, the drive of the pump is effected by rods (not shown) with a diameter of 25 mm grade 1 "Dr. super, downhole capillary tubing with an internal diameter of 5 mm is placed on the column tubing and lowered to a depth of 1200 m, with the possibility of flow of the reagent into the inner cavity of the shank, heating cable CMSS 3*10 is placed on the column of pump-compressor pipes to a depth of 900 m with a maximum heating temperature of 105°C, a maximum power of 60 kW·h.

In the operation of wells simultaneously selected sheet products at the column tubing 2 by means of a sucker rod pump 5, the heating cable 3 electric current is passed and heated sheet products inside the column tubing 2, and downhole capillary conduit 4 is pumped to the solvent oil and injected it into the inner cavity of the shank 6 of the lower sucker rod pump 5.

The viscosity of the produced reservoir crude product as a viscous nafta�Oh emulsions during well operation depending on the content of produced water increased and reached maximum values 22500 FTAs. After the implementation of the proposed layout was produced by feeding the mixture of solvent "Intat" and reagent "Record" with a specific consumption of 3-5 liters per 1 m3the fluid in the inner cavity of the shank at a depth of 1200 m, used in Parallel, the heating fluid cable CMSS 3*10, which helped to increase the temperature at the mouth to 25-27°C. in the samples from wells in the viscosity of the emulsion became less than 3 times, stood out as free water and bound remained 2-3%. Average solvent consumption "Intat" with the addition of demulsifier "Record" was 140 l/day. or 3.8 l/m3. The average consumption of electricity for heating cable was 429 kWh per day.

As a result of applying the proposed measures were able to completely eliminate the hanging of a rod string, to achieve in a short time the necessary parameters of the well and its release on the mode.

Application of the proposed method will allow to solve the problem of extraction of viscous oil emulsion.

The method of operation of the borehole, whereby the borehole is equipped with a column tubing with a sucker rod pump, with the shank with filter, with a heating cable on the outer surface of the column tubing from the mouth to the sucker rod pump downhole capillary tubing kanaroglou surface of the column tubing from the mouth to the depths of the lower sucker rod pump with the entrance to the inner cavity of the shank, in the operation of wells simultaneously selected sheet products on a column of pump-compressor pipes by means of a sucker rod pump, heating cable, electric current is passed, and capillary downhole tubing pump solvent mixture asphaltoresinparaffin deposits "Intat" and demulsifier "REKOD", the ratio of demulsifier and solvent take(1:18)-(1:22), and as the heating cable using a cable with a maximum heating temperature up to 105°C and a maximum power up to 60 kW·h.



 

Same patents:

FIELD: oil and gas industry.

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FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil or bitumen field development involves construction of two horizontal wells, one above the other, steam injection to the reservoir, reservoir heating by steam pocket formation, steam and hydrocarbon solvent injection to horizontal injector, and product sweeping from horizontal producer. Associated gas is used as hydrocarbon solvent. Steam and associated gas are injected in sequence in cycles. Steam is injected to the reservoir until extracted product viscosity is 3-5 times higher than initial viscosity at the cycle start, associated gas injection is started along with product extraction until extracted product temperature is reduced by 10-25%, then steam and associated gas injection cycles are repeated.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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FIELD: oil-and-gas industry.

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FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil well development and operation involves landing of tubing string with well pump with power cable to the well, and landing of capillary tube parallel to the power cable and attached to external surface of the tubing string by clamps. Oil or oil-containing reservoir fluid is produced. Chemical reagent is injected to the well from a tank by a metering pump through the capillary tube. Power cable is inserted to the well through cable gland. Power cable and capillary tube are protected against direct contact with internal well surface by protectors. Electric heater with extension unit, well pump with power cable and sleeve with radial hole to which the capillary tube is connected are inserted into the tubing upwards from the bottom at the wellhead. Electric heater extension unit is connected to the power cable of well pump. The tubing is landed to the well so that its shoe is located at least 2 m lower than bottom of high-viscosity oil reservoir, and electric heater is facing perforation interval of the high-viscosity oil reservoir. At the wellhead, power cable is connected to well pump and electric heater control stations and inserted to the well through cable gland. Capillary tube is inserted to the well through sealed side tap of the well X-mas tree. Electric heater is actuated, and a process break is made for 8 hours to heat bottomhole zone of reservoir in the perforation interval and high-viscosity oil heating at the inlet of well pump. After the process break, well pump is launched simultaneously with the metering pump supplying high-viscosity oil flux via the capillary tube through the radial hole in the sleeve to inner space of the tubing above the well pump.

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1 dwg

FIELD: oil and gas industry.

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1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the heavy oil extraction from underground field. Method of the heavy oil extraction from underground field includes: nanoemulsion (oil-in-water) injection to one or more injection wells, extraction of the specified heavy oil from one or more operation wells, where the specified nanoemulsion is produced using the method including: production of the uniform mixture (1) water/oil product with interfacial tension 1 mN/m maximum, containing water in quantity from 65% to 99.9% by weight, with a view to total mixture weight (1), and at least two surface-active substance (SAS) having different hydrophilic-lipophilic balance (HLB), selected from not-ionic, anionic, polymer SAS, preferably not0ionic; these SAS are in such quantity that to make the mixture (1) uniform mixture (1) dilution by the dispersion medium containing water with added at least one SAS selected from the specified SASs; this dispersion medium and SAS quantities are such that nanoemulsion is produced (oil-in-water) having HLB exceeding HLB of the mixture (1). Invention is developed in subclaims.

EFFECT: increased extraction efficiency.

34 cl, 1 dwg, 2 ex

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to production of heavy hydrocarbons. In the in situ multistage solvent extraction method of heavy oil from oil pools at first liquids and gases are extracted from zones of contact with heavy oil in order to increase interfacial area of unextracted heavy oil subject to contact with solvent. Then solvent is injected in the form of steam to the above zones in order to increase pressure in the pool up to accumulation of sufficient quantity of solvent in the form of liquid to ensure contact with enlarged interfacial surface of heavy oil. Then the pool is isolated for the period sufficient to ensure diffusion of solvent to unextracted oil through the interfacial surface at ageing stage so that the mixture of solvent and oil with low viscosity is obtained. One or more parameters of the pool are measured to determine the degree of unextracted oil liquefaction in the pool by solvent. Oil extraction from the pool is commenced by gravity drainage when viscosity of oil becomes rather low to flow through the pool to the production well.

EFFECT: maximising liquefaction of heavy oil and maximising its extraction as a result.

19 cl, 11 dwg

FIELD: oil and gas industry.

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EFFECT: improving destruction efficiency of a filter cake.

20 cl, 6 dwg, 3 tbl, 2 ex

FIELD: oil and gas industry.

SUBSTANCE: under the method of development of oil deposits with nonuniform permeability comprising successive injection via the injection well of the water suspension containing polymer, mud powder and SAS solution, prior to the suspension injection in the deposit the initial intake of the injection well is determined under pressure in water line ands water mineralisation; in water with salinity level 0.15-40 g/l complex action SASs with pour point not exceeding minus 30°C and kinematical viscosity 35-50 sSt are used, i.e. water-alcohol solution of non-ionic SAS-monoalkyl esters of PEG at the following ratio wt %: specified SAS 0.001-1.0, specified water rest, suspension and SAS solution are injected in volume ratio (1-3):1 depending on initial intake of the injection well - at intake 200-400 m3/day - 1-2:1, 400-500 m3/day - 2-3:1, over 500 m3/d - 3:1, between suspension and SAS solution water with salinity level 0.15-40 g/l or water suspension of polyacrylimide with concentration 0.0001-0.1 wt % is injected. Under another option during this method in water with salinity level 40-300 g/l the complex SAS with pour point minus 40°C max is used, containing complex action SAS with pour point minus 30°C max. and kinematical viscosity 35-50 sSt - water-alcohol solution of non-ionic SAS - monoalkyl esters polyoxyethylene glycol 90 wt % and alkyldimethylbenzylammonium chloride 10 % at following ratio of components in wt %: specified SAS 0.001-1.0, specified water - rest, suspension and SA solution are injected to the deposit in volume ratio (1-3): 1 depending on initial intake of the injection well at water line pressure - at intake 200-400 m3/day - 1-2:1, 400-500 m3/day - 2-3:1, over 500 m3/day - 3:1, and between suspension and solution the water with salinity level 40-300 g/l or water suspension of polyacrylimide with concentration 0.0001 0.1 wt % are injected.

EFFECT: increased oil recovery of the deposit.

2 cl, 4 ex, 4 tbl

FIELD: oil and gas industry.

SUBSTANCE: under method of oil deposit development comprising determination of the injection well intake, oil recovery via the production wells, and injection via at least one injection well of the water dispersion of the water-soluble polymer and alkali metal hydroxide, this dispersion contains in wt %: water-soluble polymer 0.01-0.05, alkali 0.5-1.0, at definite intake values of the injection well the specified dispersion is injected until injection pressure increasing by 20-30%, its flushing in the deposit by the injected water in volume of tubing plus 1.0 m3, alkali composition in volume 10-30% of volume of injection of the specified dispersion is injected until specific intake decreasing by 10-20% and achievement of the injection pressure not exceeding the maximum permitted pressure on production string and production deposits, the specified compositions at specified water salinity under each of three options, and flush by water in volume 10-15 m3.

EFFECT: increased oil recovery of deposits and watercut reduction of production wells, spreading of process abilities.

3 cl, 1 ex, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: method envisages the usage of aqueous solutions of binary mixtures - inorganic or organic nitrate or hydrate of alkali metals, which are injected through individual channels. The method includes the mounting of equipment in wells at the selected area of a deposit. Each well is equipped with devices to control the temperature, pressure and composition of reaction products in a real time mode. Formation areas in vicinity to the well with a volume of at least 20 m3 are heated preliminarily up to a temperature of at least 100°C by injection of at least 2 t of binary mixture reagents. Cyclic heating of the formation area in vicinity to the well with a volume of at least 100 m3 and weight of 250 t is made up to a temperature of at least 140°C due to a reaction of at least 12 t of the binary mixture reagents. At that the first level of explosion safety is ensured by the alternation of injection of saltpetre solution portions, 1 t each, with portions of industrial water of at least 0.05 t each. The second level of explosive safety in the borehole is ensured by the continuous control and monitoring of the reaction process with the temperature limitation in the well bore below the pre-blasting temperature. This temperature is determined against signs of the reaction self-acceleration at recorded charts of time-temperature and time-pressure curves. In case of these signs the injection of a saltpetre decomposition initiator is stopped to the well. Further injection of the saltpetre solution with the weight of at least 10 t is made to the preheated formation. At that the third level of explosive safety is implemented in the reaction process in the formation, which is catalysed by the heat accumulated during the previous cycles. The third level of explosive safety is ensured by a ratio of the weight of the saltpetre injected to the pores and fractures of the formation to the weight of the rock. The ratio is equal mainly to 1 to 20. Low explosive probability, close to zero, is ensured by a mixture of 95 wt % of rock and 5 wt % of saltpetre. The injection of reagents at all cycles is made at continuous temperature control in the reaction zone and pressure and temperature control in the zone near the packer and in the process of the reagents injection for the purpose of timely cessation of the reaction when the parameters of the reaction exceed limits of permitted modes.

EFFECT: improved efficiency of oil production at worked-out deposits with an increased production safety.

4 cl

FIELD: oil and gas industry.

SUBSTANCE: this invention is related to production of oil-in-water emulsions with low viscosity during operations with oil. The method for reduction of apparent viscosity for hydrocarbon fluids occurring at oil extraction and transportation includes contact of the above hydrocarbon medium with effective quantity of composite containing at least one polymer with at least 25 mole percent of cationic monomers. The invention has been developed in dependent claims.

EFFECT: increase in oil production.

15 cl, 9 ex, 4 tbl, 4 dwg

FIELD: oil and gas production.

SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

8 cl

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