Oil producing well operation method

FIELD: oil-and-gas industry.

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

EFFECT: increase in oil production.

1 ex

 

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

Known method for improving the hydrodynamic connection of wells with productive layer, which includes sealing the casing annulus of producing wells, the opening of a productive layer, hydraulic fracturing of the productive formation by setting the packer above the perforated roof of the productive formation, injection into sub-packer zone fracturing fluid, creating in sub-packer zone pressure fracturing and produce cracks fracturing fluid. When watering products producing well to an extremely cost-effective value of geophysical research determine the interval of water inflow into the reservoir. Then they inject the blocking composition to the water shut-off interval of the productive formation. Then produce a sealing annulus area in the perforated interval of the productive formation. Next is the opening of a productive layer with the exception of intervals zaizolirovali water shut-off boring punch with the angle of the phasing of 60° with the diameter of the inlet perforations in the casing at least 12 mm and a density of perforations is at least 18 resp./the POG.m. In perforated intervals from the top down-produce pointercal�tion hydraulic fracturing of the productive formation with the formation of cracks and produvkoi they jointly fracturing fluid with binder cracks, which is used in equal shares proppant fractions from 30/60 mesh to 10/14 mesh, and then allowed production well in operation (Patent RF №2485296, publ. 20.06.2013).

The closest to the proposed invention the technical essence is a method of hydraulic fracturing of carbonate reservoir with bottom water. Enhances the effectiveness of the method and its simplification. The inventive method includes the descent into the well of the column tubing - tubing with the packer and its subsequent landing, the descent into the tubing string of a column of flexible pipes - GT below the lower end of the tubing, the pumping podozrevayuschego cement through a flexible tube, conducting hydraulic fracturing of carbonate reservoir with bottom water. The lower end of the GT is lowered to the level of the oil - water contact OWC, seal the space between the columns tubing and GT, fix podozrevayuschego cement by GT produced the isolation of bottom water in carbonate reservoir to fill the borehole from the bottom to the level of the KSS. After that lasermedizin the space between the columns tubing and GT and lift the column of GT so that its lower end is at 1-2 m below the top of the carbonate reservoir, and then determine the total volume of fracturing fluid by analytical expression. Seal the space between the columns tubing and GT and produce a fix in G� first portion of the fluid gap in the amount of 60-70% of total volume of fracturing fluid at a pressure of not more than 25 MPa and at a speed not exceeding 2 m 3/min then the remaining volume of fracturing fluid pumped into GT in 3-5 cycles, alternating with the fix propping agent. As this agent is used 25% inhibited hydrochloric acid. The amount of acid is determined depending on the thickness of the productive part of the carbonate reservoir based on the volume of 0.2 m3acid to 1 m thickness at each injection cycle. Upon completion of the last cycle of injection are prodavcu acid aqueous solution of a surfactant in the amount column GT with subsequent exposure of 1-2 hours. Then extract the column of GT from the tubing string and run well into operation (Patent RF №2460875, publ. 10.09.2012 - prototype).

A disadvantage of the known method is that set forth in the fracturing proppant cracks with a significant reduction in bottomhole pressure, the proppant with the closing of the crack, as a consequence, during operation, with a significant depression-even if the reservoir pressure is reduced well productivity, decreases the duration of effect of hydraulic fracturing. Limiting the magnitude of depression does not lead to the prevention of proppant, reduced well yields, potential is not achieved, the selection of oil.

In the proposed invention solves the problem of increasing production n�PTI.

The task is solved in that in the method of operating oil wells, including hydraulic fracturing and subsequent liquid extraction according to the invention, after carrying out of hydraulic fracturing in the well leaving the proppant of nedopodacha, and the top additionally make a bridge out of sand coarse fraction, in the layout of the downhole pumping equipment include protivopotochny the filter, during operation of the well Shoe layout is placed directly above the bridge of the proppant and the fluid level during operation is maintained at the level of the deep pump.

Summary of the invention

One of the most effective ways of intensification of selection of wells is hydraulic fracturing with subsequent consolidation of acquired cracks proppant.

However, a significant reduction in bottomhole pressure for maximum production during the operation may lead to loss of well productivity and reduction of potential production. In the proposed invention solves the problem of increasing oil production. The problem is solved as follows.

In the operation of oil wells, when reducing the flow rate of oil is carried out hydraulic fracturing. After conducting hydraulic fracturing in the well leaving the proppant of nedopodacha, and on top of additionally create a bridge from the proppant coarsely� faction height mostly 5-10 m. The proppant to bridge choose the same faction, or larger than the proppant of nedopodacha, but not less than 12/18 mesh. The length of the bridge from the proppant, consequently, the amount of proppant to create the bridge is selected based on the conditions of providing back pressure on the proppant in the hydraulic fracture, sufficient to keep the proppant in the fracture when creating the decrease in the level of liquid in the well to the level of the bottom of a well.

Extracting the layout for the hydraulic fracturing of wells is carried out without washing face from the proppant. Well operation is implemented layout of the downhole pumping equipment, further comprising protivopotochny filter. Shoe layout is placed at 1-3 m above the sandy bridge for maximum depression. The operation is carried out when the liquid level at the pump intake with maximum depression on the layer.

Because the bridge of the proppant of the coarse fraction in combination with the volume of proppant nedopodacha creates back pressure on the proppant in the fracture gap and prevents a proppant, even with large depressions on the formation, this solution allows to minimize the overall depth of a deep-well pump, and create maximum depression on the layer with the establishment of the level of the liquid at the depth of the pump. In this way possible to increase the yield squa�ins and prolong the effect of increasing the flow rate from hydraulic fracturing. A large fraction of proppant contributes to the reduction of hydraulic resistance to liquid flow, to the greatest extent contributes to the seal of proppant nedopodacha and not amenable to ablation even during intensive sampling of fluid from the reservoir.

This solution provides a well operation at maximum depression without the risks of proppant and production losses in this regard.

An example of a specific application

On the oil reservoir with a longer service life and rangatiratanga oil exploit the oil wells that have penetrated the carbonate reservoir at depths 1067-1079 M. Initial well production rate was 6 m3/day. In three years of operation of the well production rate decreased to 3 m3/day. To increase the flow rate in the borehole is carried out hydraulic fracturing. In the crack gap is pumped proppant three factions: 20/40 mesh - 15%, 16/20 mesh - 70%, 12/18 mesh - 15%. Fraction of proppant 16/20 mesh is primary in relation to the total volume of proppant, a larger (12/18 mesh and larger) and therefore more held, at the final stage takes up less space, the result is created by a crack with a length of one wing of 100 m with high conductivity in a borehole. The amount of nedopodacha proppant is 0.3 m3while the concentration of proppant in a carrier fluid volume nedopodacha Mac�Kalina.

After the process of hydraulic fracturing and reducing the pressure in the well of the column tubing used for hydraulic fracturing, in-hole load of 0.6 m3proppant fraction 18/12 and conduct technology exposure for 5 hours for settling of proppant. In the result above the perforated interval creates a bridge from the proppant Raise height of 5 m from the well column tubing; used in hydraulic fracturing. In the well down the column of pump-compressor pipes with sucker-rod pump and sand filter on the end. A sand filter is placed directly above the bridge of the proppant at a distance of 2 m. Run well into operation and establish the fluid level in the borehole at the depth of the pump. As a result, the well yield was increased up to 12 m3/day. As a result of operation of the wells during the year, a significant reduction of flow rate due to declining productivity were noted.

Application of the proposed method will allow to increase the production rate of oil wells.

A method of operating oil wells, including hydraulic fracturing and subsequent selection of the liquid, characterized in that after carrying out of hydraulic fracturing in the well leaving the proppant of nedopodacha, and on top of additionally create� from the proppant of a large fraction of the long bridge, selected proceeding from the condition of providing back pressure on the proppant in the hydraulic fracture, sufficient to keep the proppant in the hydraulic fracture by reducing the level of liquid in the well to the level of the bottom of the wellbore, the composition of the layout of the downhole pumping equipment include protivopotochny the filter, during operation of the well protivopotochny the filter is placed directly above the bridge of the proppant and the fluid level during operation is maintained at the level of the deep pump.



 

Same patents:

FIELD: oil and gas industry.

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

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

1 ex, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: set of invention can be used, primarily, at development of remote oil deposits under extreme climatic conditions. Proposed process comprises recovery of associated oil has (AOG) at locations of oil separation via multistage low-temperature separation of AOG to stripped gas (SG) and dry gas condensate of AOG. This process involves separate delivery of DSG and AOG gas condensate via pipeline to the points of their accumulation, treatment and application. Note here that they are delivered via pipes to mid stations of their accumulation, treatment and partial application. These stations are located at distances not exceeding several tens of kilometres from oil fields. SG is liquefied at mid stations to produce liquefied natural gas for supply to local consumers. AOG gas condensate is subjected to deeper drying and cleaning of sulphur and other harmful impurities. LNG and dry AOG gas condensate produced at mid stations are accumulated in separate storage tanks. These products are carried by, mainly, regional line aircraft fuel carriers to regional refineries. Said refineries produce automotive propane-butane fuel and aircraft condensed fuel for local consumers as well as stock for consumers of petrochemical products as wide fraction of light hydrocarbons. The latter are delivered to other regions by, for example, medium-range tanker aircraft.

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2 cl, 3 dwg

FIELD: oil and gas industry.

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1 dwg, 1 ex

FIELD: oil and gas industry.

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17 cl, 11 dwg

FIELD: chemistry.

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FIELD: oil and gas industry.

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6 cl, 5 dwg

FIELD: oil and gas industry.

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3 ex, 6 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 extractive industry.

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FIELD: oil and gas extractive industry.

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6 cl, 2 dwg, 1 ex

FIELD: oil and gas extractive industry.

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8 cl, 1 dwg

FIELD: mining industry.

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EFFECT: higher efficiency.

2 dwg, 1 tbl

FIELD: oil and gas extractive industry.

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12 cl, 1 dwg

FIELD: oil and gas extractive industry.

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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.

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EFFECT: higher efficiency.

2 cl, 1 ex

FIELD: oil and gas industry.

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EFFECT: higher efficiency.

4 cl, 1 ex, 2 dwg

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