Well operation method

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

 

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

There is a method of oil and gas-liquid mixtures through the pump unit with separate admission of oil (oil mixture) and water (APCS), which pumped water through the shank, below the level of the oil-water contact in the reservoir and connected with the lower suction valve cylinder APCS, and oil (gas mixture) for the annular space through the side suction valve cylinder APCS (SU 1323743, published. 15.07.1987).

The disadvantage of this method is the large selection of water, often a multiple of exceeding the selection of oil, the actual extraction of water for the destruction of the cone of water, preventing the flow of oil from oil-saturated part of the reservoir, and the reduction effect in the production of oil.

The closest to the proposed invention the technical essence is a way of putting pressure on the bottom area of the well field with underlying or bottom water and oil pump rod-compressor with separate reception hydrocarbon and water. For the implementation of the way down into the well column tubing (tubing) with the retainer and the shank. Served through the shank in the drill pipe is heated to 70-80C a mixture of anhydrous oil from oil-soluble and is and macrovomitorium surfactant in the amount sufficient to displace the cold and the cooled oil from the shank in the annulus of the borehole in the zone of the reservoir and placing the heated mixture in front of the perforations. Overlap the packer annulus of the well and pumped under pressure to a heated mixture of oil, surfactant below installation of the packer into the reservoir, maintain the pressure for a time sufficient to decompose water-oil emulsion in a cone of water in a well bore zone, then rip off and retrieve the packer. In the well down rod pump-compressor with separate reception and install it so that the inlet shank was located below the middle line of oil-water contact for cone watering, and are pumping produced water through the shank, and oil in the annular space through the side valve pump compressor (RF patent No. 2293214, published. 10.02.2007 - prototype).

A known method can be implemented only in specific applications of insulated pipes, allowing to deliver the heated fluid in the interval of the reservoir, the method is accompanied by a large selection of associated water.

In the proposed invention solves the problem of reducing the production of associated water.

The task is solved in that in the method of operating a well comprising pumping a composite material in place is in the interval below the oil-water contact, conducting technological exposure and operation of wells, according to the invention previously conducted pushing water from the annulus of oil in the interval below the oil-water contact, for the preparation of a composite material are filled in the annular space of the well thickener based 1-5 kg per 1 m3the oil in the annular space, and mixing the thickener with the oil in the annular space by the circulation of oil with a thickener of the column tubing and the annular space, and the injection of a solution of oil and thickener annulus in the interval below the oil-water contact are in pulsed mode at pressures greater than hydrostatic pressure of not more than 10%, while after the process of aging well operation in the first 5-15 days. hold in the power saving mode with a flow rate of not more than 50% of the worker.

The invention

In the development of oil, gas and gas condensate fields with plantar water inevitably have to deal with the phenomenon of consobrina when the underlying water rises to the perforation holes and overlaps all or part of the access oil in the well. Existing technical solutions solve the problem of consobrina only partially. Mostly fighting what consobrina boils down to the preferential selection of water from the underlying water and generate zero or even inverted cone of water. However, you have to take a huge amount of associated water. Well from the oil actually becomes vododobyvayuschih. In the proposed method solves the problem of reducing the production of associated water. The problem is solved as follows.

During operation of the oil wells that discover the producing formation with the underlying water supply well depth equipment for lifting to the surface and replacement of individual elements to the selection of oil from the interval above the oil-water contact, the injection of the annulus fluid in the interval below the oil-water contact and circulation of liquid through the column tubing and the annular space.

Typically, the interval of the well from the productive formation to pump filled the reservoir with water. In our case, this water is undesirable element. To remove it from the well spend pushing water from the annulus of oil in the interval below the oil-water contact. Then make the fill annulus of the well thickener, such as polyacrylamide, hydrolyzed polyacrylonitrile, methyl cellulose and the like, at the rate of 1-5 kg per 1 m3the oil in the annular space, and mixing the thickener with the oil in the annular space by the circulation of oil is the thickener of the column tubing and the annular space. Perform the injection of the solution of oil and thickener annulus in the interval below the oil-water contact in pulsed mode at pressures greater than hydrostatic not more than 10%. The pulse mode, do the following. Download solution to increase the pressure injection to hydrostatic +10%, stop the injection and hold the shutter speed to reduce the pressure to the hydrostatic +(2-6) %. Again injected to increase the pressure to hydrostatic +10%, again carry out the specified shutter speed, etc. to download the full volume of the solution of oil and thickener. Push the solution in the oil. Conduct technology exposure for structuring a solution of the oil with a thickener. After the process of aging well operation in the first 5-15 days. hold in the power saving mode with a flow rate of not more than 50% of the worker.

A possible variant of the underground layout shown in the drawing.

In the drawing, producing well 1 is equipped with a casing 2, a perforated interval of the productive layer 3 with the oil-water contact 4. In the well 1 down the column tubing with 5 oil pump 6, the packer 7 above the roof of the productive layer 3, a spring-loaded non-return valve 8 and perforations 9 in the lower part. Lower spring-loaded check valve 8 within the colon is s tubing 5 has a nozzle 10, which is reported on the top above the packer 7 with the annular space of the borehole 1, and the bottom is equipped with a packer 11 mounted in the interval of oil-water contact 4, and a spring-loaded non-return valve 12, capable of flowing fluid from the interior of the pipe 10 in the interval below the oil-water contact 4. At the wellhead 1 is made binding column tubing 5 for connection with the discharge line 13, line connection with the annular space of the borehole 14 and the discharge line 15. The valve 16 is designed to overlay flow lines 14, the valve 17 to overlap the line of connection with the annular space, the valve 18 to overlap the discharge line 15.

The device operates as follows.

In working condition, open the valve 16 and closed valves 17 and 18.

Select fluid from the interval above the oil-water contact 4 by the pump 6 through the tubing pipe 5. In this case, valve 16 is opened, the valves 17 and 18 are closed. During the formation of the cone watering and significant flooding of the produced products stop the operation of the pump 6, close the valve 16 and open the valves 17 and 18. On the discharge line 15 in the annular space of the borehole 1 separate pump (not shown), for example, from the retainer Assembly pump in the oil from the well pump to packer 7. Then without interruption of the injection pump thickener based 1-5 kg per 1 m3the oil in the annular space. The flow of fluids in the tubing tube 5 prevents the valves in the pump 6 (not shown). The valve 15 is closed and when closed, the valve 16 and open the valve 17 start the pump rod 6. Perform mixing of the thickener with the oil in the annular space by the circulation of oil with a thickener of the column tubing 5 through piping with valve 17, the annular space of the well 1, the holes 9 and the column tubing 5. Pre-spring of a spring-loaded valve 8 is set so that when the circulation valve 8 was closed. Circulation perform to obtain a homogeneous mixture (solution) of the thickener and oil. Then upload the resulting mixture of oil and thickener annulus in the interval below the oil-water contact in pulsed mode at pressures greater than hydrostatic not more than 10%. To do this, stop the pump 6, open valve 18 and open valve 17 and the closed valve 16 is injected into the annular space of the borehole 1 in the oil well 1, which expels the mixture of oil and thickener annulus of the borehole 1 in the Patra is OK 10 and through the spring loaded check valve 12 below the packer 11 in the interval below the oil-water contact and further into the reservoir. Close all valves and stop all injection and extraction at the well. Conduct technology exposure for 1-3 days. for the formation near the well bore space in the area of the cone watering reliable insulation of the screen. After the process of aging well operation in the first 5-15 days. hold in the power saving mode with a flow rate of not more than 50% of the worker.

In the result it is possible to reduce the water content of products produced by 30-40% and reduce the amount of water in the well.

Specific example

Exploit oil well according to the drawing, which is provided with a casing 2 with a diameter of 245 mm(9||), perforated in the interval 1710-1720 m productive layer 3 with the oil-water contact 4 on the depth 1714 m well 1 down the column tubing 5 with a diameter of 168 mm (6||with sucker-rod pump 6, the packer 7 above the roof of the productive layer 3, a spring-loaded non-return valve 8 and perforations 9 in the lower part. Lower spring-loaded check valve 8 inside the column tubing 5 has a pipe 10 with a diameter of 60 mm (2||).

In working condition, open the valve 16 and closed valves 17, 18 and 19.

Select a liquid with a rate of 16 m3/day. from the interval above the oil-water contact 4 by the pump 6 through the column pump to pressornyh pipe 5. In this case, valve 16 is opened, the valves 17 and 18 are closed. During the formation of the cone watering and irrigation of products produced up to 80% stop operation of the pump 6, close the valve 16 and open the valves 17 and 18. On the discharge line 15 in the annular space of the borehole 1 single pump cementing unit CA-320 pumped oil in the amount of 14 m3i.e. the volume of the well from the pump 6 to the packer 7. Then without interruption of the injection pump thickener - polyacrylamide in the form of a 5%dispersion in oil at the rate of 3 kg per 1 m3the oil in the annular space of 40 m3. The valve 15 is closed and when closed, the valve 16 to open the valve 17. Start the pump rod 6. Perform mixing of the thickener with the oil in the annular space by the circulation of oil with a thickener of the column tubing 5 through piping with valve 17, the annular space of the well 1, the holes 9 and the column tubing 5. Pre-spring of a spring-loaded valve 8 is set so that when the circulation valve 8 was closed. Circulation perform to obtain a homogeneous mixture (solution) of the thickener and oil. Then upload the resulting mixture of oil and thickener annulus in the interval below the water-oil to the of intacta in pulsed mode under pressure, exceeding the hydrostatic pressure of not more than 10%. To do this, stop the pump 6, open valve 18 and open valve 17 and the closed valve 16 is injected into the annular space of the borehole 1 oil in the amount of 40 m3well 1, which expels the mixture of oil and thickener annulus of the borehole 1 in the pipe 10 and through the spring loaded check valve 12 below the packer 11 in the interval below the oil-water contact and further into the reservoir. Close all valves and stop all injection and extraction at the well. Conduct technology exposure for 2 days. for the formation near the well bore space in the area of the cone watering reliable insulation of the screen. After technological exposure operation of the well in the first 10 days. hold in the power saving mode with a flow rate of not more than 50% of the worker.

In the result it is possible to reduce the water content in crude production by 35% and reduce the amount of water in the well.

A method of operating a well comprising pumping a composite material in the reservoir in the interval below the oil-water contact, conducting technological exposure and operation of wells, wherein the previously conducted pushing water from the annulus of oil in the interval below the oil-water contact, for making a composite material p is avodat fill in the annulus of the well thickener based 1-5 kg per 1 m 3the oil in the annular space, and mixing the thickener with the oil in the annular space by the circulation of oil with a thickener of the column tubing and the annular space, and the injection of a solution of oil and thickener annulus in the interval below the oil-water contact are in pulsed mode at pressures greater than hydrostatic pressure of not more than 10%, while after the process of aging well operation in the first 5-15 days spend in a sparing mode with a flow rate of not more than 50% of the work.



 

Same patents:

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.

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3 cl, 3 tbl, 1 ex, 3 dwg

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2 cl, 1 tbl, 24 ex

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1 ex, 4 dwg

FIELD: oil-and-gas production.

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2 tbl

FIELD: oil and gas production.

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2 ex, 2 tbl

FIELD: oil and gas production.

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1 ex, 4 dwg

FIELD: oil-and-gas production.

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2 cl, 4 tbl, 4 ex

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5 dwg, 1 ex

FIELD: oil and gas production.

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3 cl, 1 dwg

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1 ex

FIELD: oil and gas production.

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2 tbl, 2 ex

FIELD: oil and gas production.

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1 tbl

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

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1 tbl

FIELD: oil extractive industry.

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.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency.

7 cl, 1 ex

FIELD: oil industry.

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EFFECT: higher efficiency.

8 ex, 2 tbl

FIELD: oil and gas industry.

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EFFECT: higher precision.

2 cl, 2 dwg, 1 ex, 1 tbl

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