Well operation method

FIELD: oil and gas industry.

SUBSTANCE: well is equipped bottom upwards with a tubing string ended with a packer, submerged pump, switch, two outer and inner annulus of the tubing string which are located concentrically, tubes with holes at the outer tubing string. The well is splitted over the productive stratum. The stratal product is delivered by the submerged pump in a cyclic mode "delivery-stop" from the productive stratum through the tubing string, the switch, tubular annulus between inner and outer tubing string, tubes and holes of tubes into tubular annulus between the production string and outer tubing string. Pressure is created and maintained in the upper pert of the well; it should not be less than oil degassing pressure and more than permissible pressure to the production string. Separation of the stratal product into oil and water is arranged in the upper part of the well. Completeness of separation is controlled by the duration of a half of the operation cycle of the submerged pump till stoppage and by the distance between switch and the tube with a hole. Oil is delivered to oil line. Water is supplied through the switch to inner tubing string and through the pipeline to an injection well by borehole-to-borehole water pumping and/or through tubular annulus between the production string and outer tubing string and tubing string with a packer to the stratum over the packer by borehole water pumping.

EFFECT: improvement of oil and water separation degree, increase in injection efficiency of separated water during borehole and borehole-to-borehole pumping of water.

1 ex, 1 dwg

 

The invention relates to the oil industry and can find application in the operation of the oil wells split formation products in the borehole and downhole and/or inter-well pumping the separated produced water or during operation of water wells, the produced reservoir fluid which has oil.

There is a method of developing multilayer oil field, which provides for the placement of wells on a dedicated area of development of deposits of the approved project Kustov way, determination of reservoir properties in the context of cyclic injection of produced water through injection and oil extraction through production wells. When you are drilling injection wells with the depth of the shaft below the lower operational object before opening aquifers. Then Buryats producing wells. If hypsometric marks of productive strata below the oil-water contact or will be opened zone lithology substitution on ncollector, the deepening of the borehole bottom also continue to showdown mentioned aquifers. After completion of the drilling site within the Bush with regard to obtained the maximum possible geological information wells are grouped into a single system development that accounts for the relative to the bottom, and the flooding of the reservoir through injection wells is carried out by borehole or well pumping water from the mentioned aquifers or zasolennyh drinking water from the upper horizons, located on the territory of the developed land (Patent RF №2158821, publ. 10.11.2000).

The closest to the proposed invention the technical essence is a way of crosshole liquid transfer, which includes the selection of oil from the reservoir, the selection of produced water through wells and injection of produced water through injection wells into the reservoir. According to the invention interwell transfer fluid is conducted in flooding of the produced oil above the limit of profitability of its production - when the water content of the produced oil order 98,0 of 99.9%. As water wells use the former production wells. The selection of produced water are of Obvodnogo of the reservoir, the injection of produced water through injection wells are in the reservoir bypassed oil reserves. The selection of oil from the reservoir lead through the intake hole. In water well separate oil and water. Water is taken on the tubing and pipe for oil and water lines pumped into injection wells. Oil accumulate in the annular space of the well. PEFC is filling the annulus of the well oil well stop, organize the circulation of liquid in the well, the oil from the annulus displace in the pipeline of the reverse flow of water and run well. At the same time filling the annulus bore oil is determined by the analytical expression (RF Patent No. 2290500, publ. 27.12.2006 - prototype).

A disadvantage of the known technical solutions is a low degree of separation of produced products for oil and water, the low efficiency of the discharge separated water at inter - or downhole pumping.

In the proposed invention solves the problem of increasing the degree of separation of produced products for oil and water, and improving the efficiency of injection of separated water at inter - or downhole pumping.

The problem is solved by the method of operation of the well, namely, that the well supply bottom-up column tubing with a packer on the end, pump deep switch, two concentrically arranged outer and inner columns, tubing, pipe with holes on the outer string of tubing, share the well packer above the lower reservoir, serves layered products pump deep in cyclic mode "flow-stop" from the lower productive formation through the column pump to the pressure pipe, through the switch, the annular space between the inner and outer columns, tubing, pipe and the bore of the pipe in the annulus between the production column of the well and the outer casing tubing, create and maintain at the top of the well pressure is not less than the degassing pressure oil and not more than the permissible pressure in the production casing in the upper part of the well organize the division formation products for oil and water, regulate the completeness of the separation fluid duration of politicla operation of the downhole pump "stop" and the distance between the switch and socket with holes direct the oil in the oil line, water is supplied through the switch in the inner column tubing and the pipeline to the injection well well pumping water and/or the annular space between the production column and the outer column of tubing and casing tubing with the packer into the reservoir above the packer downhole pumping water.

The invention

Existing technical solutions aimed at downhole separation (separation) formation products for oil and water, have a low degree of separation of produced products for oil and water is, low efficiency discharge separated water at inter - or downhole pumping.

Low degree of separation of produced products associated with the use of dynamic split mode, in which the downhole pump is running continuously. This creates a turbulent flow of fluid, contributing to the mixing of oil and water and slow the separation of liquids.

The low efficiency of the discharge separated water at inter - or downhole pumping due to appearing in the oil well gas, which is compressible by the environment and creating well a kind of buffer, the compression of which is spent primary energy pump, while pressure water injection in well or downhole pumping is insufficient for water injection into the reservoir.

In the proposed invention solves the problem of increasing the degree of separation of produced products for oil and water, and improving the efficiency of injection of separated water at inter - or downhole pumping. The problem is solved as follows.

The well supply layout presented in figure 1.

The composition contains from bottom to top: the packer 1, divisive lower productive 2 and the upper absorbent layer 3, mounted on the column tubing 4, which posted above is Electrotechnology pump 5, equipped with a flow meter and telemetry system (not shown). At the upper end of the column tubing 4 has a switch 6, which is connected with two concentrically arranged outer 7 and 8 internal columns, tubing, pipe 9 with holes 10 7 on the outer string of tubing. The switch 6 connects the inner space of the column tubing 4 with the annular space 7 between the outer and inner 8 columns of tubing, which in turn is connected with the pipe 9 and through holes 10 of the pipe 9 with the annular space of the well 11 between the production column 12 and the outer column 7 of tubing. Simultaneously, the switch 6 connects the annulus of the well 10 with the internal internal space 8 of the column tubing. At the mouth of the bore 11 has piping with shutoff valves and fittings. Internal 8 column tubing are connected by pipelines with one or more injection wells (not shown). The well is operated as follows.

Share the well packer 1 above the lower reservoir 2, serves layered products centrifugal pump 5 in cyclic mode "flow-stop" from the lower productive place is and 2 of the column tubing 4, through the switch 6, the annular space between the inner 8 and outer 7 columns, tubing, pipe 9 and holes 10 in the annulus between the production column 12 of the bore 11 and the outer column 7 of tubing. Create and maintain in the upper part of the borehole 11, the pressure is not less than the degassing pressure oil and not more than the permissible pressure in the production casing 12. In the upper part of the borehole 11 organize the division formation products for oil and water. Regulate the completeness of the separation duration of politicla work electrical submersible pump 5 "stop" and the distance between the switch 6 and the pipe 9 with holes 10. Direct the oil in the oil line. Limit the consumption of oil by the choke restriction and isolation valves type of valve. Depending on the needs of the system of reservoir pressure maintenance, water is supplied through the switch 6 in the interior 8 of the column tubing and onshore pipeline to the injection well well pumping water and/or the annular space between the production column 12 and the outer column 7 of tubing and casing tubing 4 with the retainer 1 in the upper absorbent layer 3 above the packer 1 downhole pumping water. The path of water flow adjustable lighting angle is t shutoff valves at the wellhead, blocking or opening the outlet from the interior 8 of the column tubing.

In the result, it is possible to avoid degassing of oil in the well and, thereby, to create conditions for the organization of a high pressure sufficient for injection of water in cyclic mode. Cyclic mode has a beneficial effect on the capacity of the well and the oil displacement from the stagnant zones of the Deposit. Also allows the separation of oil a considerable amount of time in static mode, which determines the completeness of the separation.

Specific example

Operate a water well, mining produced water to maintain reservoir pressure with oil content of 2.8%. The pressure of the degassing oil is 8.4 MPa permissible pressure in the production casing is of 11.0 MPa. The borehole 11 is equipped according to figure 1. The reservoir 2 is located at a depth of 1798 m as the depth of the pump 5 is used centrifugal pump brand ACNE-160-2000 capacity of 160 m3/day, pressure to 2000 m, equipped with soft starters. The switch 6 is placed at a depth of 1300 m, subs with holes 9 is at a depth of 290 and 300 m, respectively. Internal column tubing 8 has a nominal diameter of 48 mm, outer 7-89 mm Column tubing 4 has a nominal diameter 73mm. The nozzles 9 have 12 calibrated holes 10 with a diameter of 20 mm Bore 11 has a production casing 12 with a nominal diameter of 168 mm

Periodic operation mode electrical submersible pump 5 designate the following: 8 min - work, 2 min stop. Piping on the supply line of oil on the mouth in the hole 11 of the support pressure in the range from 10.0 to 10.5 MPa. The total flow rate when running in periodic mode is 125 m3/day. Fluid containing oil and water, in a volume of 25 m3/day arrives in the oil line group metering installation. The flow of separated oil in this volume is 2.7 m3/day. The purified oil from water in a volume of 100 m3/day injected into a nearby injection well system onshore pipelines, implementing inter-well pumping water.

The application of the proposed method on the well allowed to produce additional 2.7 m3/day of oil, indicating a more complete separation in the well of the reservoir fluid into oil and water. Increased permeability of the reservoir into the injection well 18%.

The application of the proposed method will allow for a greater degree of separation of produced products for oil and water and to increase the efficiency of injection of separated water at inter - or downhole pumping.

The way of usage of the well, namely, that the well supply bottom-up column tubing with a packer on the end, pump deep switch, two concentrically arranged outer and inner columns, tubing, pipes with holes on the outer string of tubing, share the well packer above the reservoir, serves layered products pump deep in cyclic mode "flow-stop" from the reservoir through the column tubing, through the switch, the annular space between the inner and outer columns, tubing, pipe and openings of the nozzles in the annular space between the production column of the well and the outer casing tubing, create and maintain at the top of the well pressure is not less than the degassing pressure oil and not more than the permissible pressure in the production casing in the upper part of the well organize the division formation products for oil and water, regulate the completeness of the separation duration of politicla operation of the downhole pump "stop" and the distance between the switch and pipes with holes that direct the oil in the oil line, water is supplied through a switch in the interior of the column tubing and pipe the wire to the injection well well pumping water and/or the annular space between the production column and the outer column of tubing and casing tubing with the packer in the reservoir above the packer downhole pumping water.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method of free gas separation by turning of liquid-gas mixture upflow and its passage through semi-transparent separation surface. Separation surface contains vertical slots. Pressure gradients are created perpendicular to separation surface.

EFFECT: ensuring of identical rate of volume flow for movement of liquid-gas mixture.

3 cl, 1 dwg

FIELD: oil and gas industry.

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2 cl, 5 dwg

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.

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34 cl, 27 dwg

FIELD: oil and gas industry.

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18 cl, 6 dwg

FIELD: oil and gas industry.

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3 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes blocking of a perforation interval by means of injection of a blocking liquid and its pushing with a killing fluid to a bottomhole and to a bottomhole area of a bed with simultaneous monitoring of pressure at a well head, gas relief and process settling. At the same time, prior to injection of the blocking fluid, a sand screen is formed by injection of a pulp of quartz sand with fraction of 0.6-1.2 mm in a carrier fluid in two portions with a flow rate of a carrier fluid, the value of which does not exceed the maximum permissible value, defined according to the formula. At the same time the volume of the quartz sand in the first portion of the pulp is calculated in accordance with the formula with further process settling of the well for the time determined according to the formula after injection of the first pulp portion. The volume of the quartz sand in the second pulp portion is taken as equal to the volume of suffosion channels produced in the sand screen. The blocking fluid is a certain composition. The blocking fluid volume is previously calculated according to the formula. Besides, at the moment of completion of blocking fluid pushing, hydrodynamic pressure is determined in a tubing string. Afterwards the process settling of the well is carried out. Further injection of the killing fluid into the well is carried out along the tubing string until it appears at the well head. At the same time the well head pressure is controlled in the annular space of the well by means of gas and blocking fluid relief, providing for pressure at the inlet to the tubing string as permanent and equal to the predetermined hydrodynamic pressure.

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1 tbl

FIELD: oil and gas industry.

SUBSTANCE: design of low-angle and horizontal wells includes a technical string, an operating string and a lift string. The operating string is cemented above the productive formation roof. The operating string in the productive formation is divided into sections with casing packers, and sections include filter sections and sections of solid pipes. The lift string in the productive formation is equipped with operating packers, installed inside the sections of solid pipes of the operating string and groups of controlled valves equipped with calibrated inlet side holes arranged inside filter sections. A seat nipple is installed at the end of the lift string. Controlled valves and the nipple are made as capable of interaction with control devices lowered inside a lift string.

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3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of heavy oil or bitumen deposit with control of well product extraction involves construction of upper injection and lower production wells with horizontal sections located one above another. At construction of wells their horizontal sections are equipped with filters installed opposite productive formation zones. Inside filter with non-perforated interval in production well there arranged is a shank provided with inlet holes dividing the filter into extraction zones. Besides, shank is equipped on the inner side with a stock with side channels. Inner space of stock is interconnected with inlet of pump lowered to production well on the tubing string with possibility of longitudinal movement of the tubing string together with pump and stock in the shank. Heat carrier is pumped through horizontal injection well with warming-up of the formation by creating the steam chamber, and product is extracted through horizontal production well. Thermograms of steam chamber are taken, the chamber's warm-up state is analysed for uniform heating and available temperature peaks, and considering the obtained thermograms, uniform heating of steam chamber is performed. Before the tubing is lowered to production well, first, stock is lowered with a shank concentrically arranged on it and fixed in transport position with a shear screw. Besides, on the outer side of the shank lower end there installed is heat-resistant packer; after the stock is lowered to production well, lower end of tubing is put on its upper end. Tubing is equipped with a pump. Tubing is lowered to production well till the packer is arranged at non-perforated interval of production well filter; after that, packer is installed by dividing the filter of production well into two extraction zones - initial and final. Uniform heating of steam chamber is performed by supplying the heat carrier through injection well. Penetration of heat carrier and/or formation water to the pump inlet is avoided by controlling the product extraction to the pump inlet from the initial extraction zone. Besides, product extraction volume is reduced in the initial extraction zone where temperature peaks occur. For that purpose, inlet shank holes corresponding to the initial extraction zone are made with reduction of carrying capacity from face to head, and side channels of stock are provided with possibility of alternating interaction with one of inlet shank hole in the initial extraction zone. This is performed by restricted longitudinal movement of pipe string together with pump and stock relative to shank by increasing or reducing the number of connection pipes on upper end of pipe string depending on the distance between inlet holes of the shank. Pipe string is fixed on the head of production well in the required position by means of a face plate on a supporting flange, and shank hole corresponding to the final extraction zone is made in the form of an open stock end.

EFFECT: improving the control of product extraction volume from extraction zones; simpler erection and lower metal consumption on the design.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of fluid extraction from the well is performed in the following way: the first adjustment at least of the first well equipment for fluid production is performed; the first set of input parameters is chosen, which includes at least one parameter referring to serviceability degree at least of one second well equipment and sets of parameters chosen from the group including the data referring to efficiency, pressure, temperature, presence of the chosen reagent, content of water, content of sand and flow rate of injected chemical reagents. The first set of parameters is used to be entered to the computer model, and the second adjustment at least of one first well equipment is performed, which will provide at least extension at least of one second well equipment or increase in completed well flow rate. Also, control system of operation of electric submersible pump is proposed, which contains information storage data base relating to operating range of submersible pump, and processor for adjustment at least of one first well equipment, which has the possibility of using at least one measured operating parameter of submersible pump and information stored in the data base.

EFFECT: invention allows performing the monitoring of well shaft state and serviceability degree of various equipment and taking actions, which will provide increased or optimum production of hydrocarbons from the well.

25 cl, 4 dwg

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

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