The method of processing bottom-hole zone of the well

 

(57) Abstract:

The invention relates to the oil and gas industry and may find application in the treatment of bottom-hole zone of the well. Well equipped column tubing and insertion depth of the pump shaft and the filter on the end of not more than the diameter of the pump. Extracted from the borehole plug submersible pump with liner and filter. Reduce the pressure in the well swabbing and selection of the well fluid in the tubing pipes to achieve the necessary pressure. Lead the descent of charges for termoliticheskogo impact in the column tubing. Termoliticheskogo exposure is carried out at reduced pressure in the well. Cause the inflow of swabbing or compression. Run the well into operation. Increased efficiency and reduced labor costs for processing.

The invention relates to the oil and gas industry and may find application in the treatment of bottom-hole zone of the well.

A method of processing bottom-hole zone of the well, including injection into the bottom zone of the processing composition, its displacement in the reservoir, the shutter speed respnose mode by reducing the pressure on the bottom is less than the reservoir, the decrease in liquid level in the annulus and cleaning out the bottom zone of multiple implosion effect to stabilize the dynamic level in the annulus (RF Patent No. 2168621, CL E 21 In 43/25, publ. 10.06.2001).

There is a method allows for the impact with reduced pressure on the bottom and clean the bottom-hole zone from mechanical clogging elements, however, the lack of heat exposure does not clear the bottom zone, kolmat asphalt, resin and paraffin deposits.

A method of processing bottom-hole zone of the well, including the descent of the underlying technological equipment source termoliticheskogo impact, burning the last of the processed interval with the formation of gas of high pressure and temperature, depression impacts and selection of the liquids from the bottom zone (RF Patent No. 2001110018, CL E 21 In 43/25, publ. 27.03.2003).

Due to thermal element impacts the known method allows you to clean the bottom-hole zone from oil deposits, however, the efficiency of the method is low due to the absence of reduced pressure at the bottom hole, which is not compensated PR is snasti is a method of processing bottom-hole zones of oil-bearing stratum by clearing its products of combustion of the powder charge, the descent into the well, for the combustion of the charge pulse pressure reduction in the treatment area (USSR Author's certificate No. 684948, CL E 21 In 43/24, publ. 10.05.2000 - prototype).

The known method does not effectively clean the bottom-hole zone from clogging elements due to the absence of reduced pressure at the bottom hole, which is not compensated by the use of implosive effects. In addition, the application of the method requires considerable effort on the descent and ascent of the column tubing downhole equipment.

The invention solves the problem of increasing the effectiveness of impact and reduce labor costs for processing.

The task is solved in that in the method of processing bottom-hole zone of the well, including termoliticheskogo impact and running well in operation, according to the invention the supply well casing tubing and insertion depth of the pump shaft and the filter on the end of not more than the diameter of the pump, before termokataliticheskikh effects extracted from the borehole plug submersible pump with a shank and a filter to reduce the pressure in the well swabbing and selection of the well fluid in the column of nasonia carried out in a string of tubing, termoliticheskogo exposure is carried out at reduced pressure in the well, and after termoliticheskogo exposure cause the inflow of swabbing or compression.

Features of the invention are:

1. termoliticheskogo effects;

2. the launch of the wells in operation;

3. supply well casing tubing and insertion depth of the pump shaft and the filter on the end of not more than the diameter of the pump;

4. before termokataliticheskikh the influence of extraction from wells insertion depth of the pump shaft and the filter;

5. the same reduction in pressure in the well swabbing and selection of the well fluid in the tubing pipes to achieve the necessary pressure;

6. the descent of charges for termoliticheskogo impact in the column tubing;

7. termoliticheskogo impact under reduced pressure in a borehole;

8. call flow swabbing or compression.

Signs 1, 2 are shared with the prototype, signs 3-8 are the salient features of the invention.

The invention

When working oil SLE is reduced well yield. Known techniques can help improve the cleaning efficiency of the bottomhole zone. However, the methods of time-consuming, multistage. When cleaning heavily kolmat asphalt, resin and paraffin deposits bottomhole method is ineffective.

One of the effective methods used to increase the pick-up or return of layers is to increase the permeability zone wells affected by the powder gases. The method is based on mechanical, thermal and chemical effects on rocks and fluids of the formation of a certain portion of the powder gases generated directly in the hole burning of the powder charge in the generator pressure.

Powder gases under high pressure and temperature, expands and pushes the fluid in the borehole into the formation through the perforations in the casing, produce penetration into the formation with getting cracks and chemical stimulation. When this melted paraffin and wax deposits, dissolved water, water barriers and hydrate plugs, decreases the viscosity of the oil. In addition, during the reverse movement of the layer of powder gases to purify the crack producesthe effects the powder gases are the need to work on the full recovery of underground equipment and full release of underground equipment after exposure and reduced cleaning effect due to the cooling zone impacts during descent underground equipment.

Descend underground equipment takes up to 12 hours, while the cooling zone of impact occurs within 2 hours. This can minimize the effect, as with the cooling zone of influence of resin-asphaltene compounds freezes and re-clog the bottomhole zone.

In the proposed method ensures the inflow of liquefied resin-asphaltene compounds immediately after heating of the bottom-hole formation zone by eliminating lifting tubing, lowering and lifting only the column bars, reduce the time of descent of underground equipment. Increased efficiency and reduced labor costs for processing.

The method is implemented for wells equipped with sucker rod pumps, which include removing the insertion depth of the pump shaft and filter rods. Column tubing when it is removed. Well pressure reduces swabbing and selection of the well fluid in the tubing pipes to achieve the necessary pressure. The descent of charges for termoliticheskogo exposure is carried out in the column tubing. T what actions cause the inflow of swabbing the column tubing or compression.

Thermogenically charge is lowered into the borehole on a logging cable. Size termoliticheskogo charge diameter less than the internal diameter of the column tubing.

Column tubing with the inner part is equipped with locking support. Castle bearing down with the column tubing on the calculated depth. The well will be equipped with plug-in pump deep down in the column of bars and secured in the lock support. At the suction hole of the pump is fixed to the several pipes with a diameter less than the diameter of the pump, called the shank, and the strainer is also not more than the diameter of the pump. This circumstance allows to extract from the column tubing pump, liner and filter simultaneously with the lifting rods.

The bottom of the column tubing is equipped with a funnel to ensure a smooth entry of the head of the cable during its ascent.

The proposed method is as follows.

Stop the well. Well remove the pump liner and filter. The column tubing is produced by swabbing. The process of swabbing is a multiple of the trigge is immersed under the liquid level at 300-600 m, and then raise the cable.

When the movement of Swanage Cup up due to the hydrodynamic pressure of the upstream fluid beaker walls diverging and overlapping the inner cavity of the column tubing. When lifting Swanage cups simultaneously removed, and the liquid located in the string of tubing above Swanage Cup. The process of swabbing produce to reduce the liquid level in the well to the calculated depth, providing the desired downhole pressure. This ensures the inflow of formation fluids.

After swabbing wells shall descend termoliticheskogo charge on wireline in the perforation interval and produce termoliticheskogo impact.

By lowering the liquid level swabbing termoliticheskogo impact is in terms of depression. Resin-asphaltene compounds begin to flow into the wellbore, which leads to purification of the pore environment of bottom-hole zone of the well.

Swarnim lift in the course of time, when the bottom-hole zone is in a heated state, is the selection of the supplied product formation.

After that the well swabbing to implement fails due to the failure of Swanage Cup in string of tubing, the stimulation can be performed via the starting clutch installed at depths of 600, 800 and 900 meters that you are carrying out the injection of foam or inert gas in the annulus compressor and blow it out of the downhole fluid in the string of tubing, and then release of injected gas. Created with this depression causes the flow of fluid from the reservoir.

To prevent leaks when the pump is in operation, the starting clutch is made in the form of a valve block unilateral action. For this purpose they will be equipped with check valves, which provide the flow of injected gas in the column tubing from the annulus and tightly closed during operation of the pump due to the pressure developed by the pump.

Specific example

Spend processing bottom-hole zone of the oil well with a depth of 1,260 m and perforation interval at 1230-1240 m Borehole supply column tubing with a diameter of 73 mm locking bearing down with the column tubing to a depth of 1100 mm Well equipped plug-in pump deep brand 175-RHMT-12-4-4 lowered on the column of bars and secured in the castle, and strainer diameter of 25 mm of the bottom of the column tubing is equipped with a funnel. Extract from the well column rods with the detachable pump deep shank and filter. Reduce the pressure in the well swabbing and selection of the well fluid in the tubing pipe to reduce the pressure on the face from 10 MPa to 3 MPa. Down the charge for termoliticheskogo impact in the column tubing in the perforation interval. Termoliticheskogo exposure is carried out at reduced pressure at the face. After termoliticheskogo exposure cause the inflow of swabbing. On the column of bars down the pump shaft and the filter and set in castle anvil. Run the well into operation.

As a result, the flow rate increased from 1 t/day up to 4 tons/day. The application of the proposed method will improve the efficiency and reduce labor costs for processing.

The method of processing bottom-hole zone of the well, including the lowering of charges for thermochemical effects, termoliticheskogo impact and running well in operation, characterized in that the supply well casing tubing and push deep naso the cabins from the well plug submersible pump with a shank and a filter, reduce the pressure in the well swabbing and selection of the well fluid in the tubing pipes to achieve the necessary pressure, the lowering of charges for termoliticheskogo exposure is carried out in a string of tubing, termoliticheskogo exposure is carried out at reduced pressure in the well, and after termoliticheskogo exposure cause the inflow of swabbing or compression.

 

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1 dwg

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21
-d22
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2 cl, 1 dwg

FIELD: oil industry.

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EFFECT: higher oil yield.

2 ex

FIELD: mining industry.

SUBSTANCE: processing periods include forming of depression pressure change between well-adjacent bed zone and well hollow. Cleaning of well-adjacent bed zone is performed by prior feeding of fluid into well, forming of periodic pressure pulses in well-adjacent bed zone in form of fading standing wave, moving along the well, and decreasing pressure during fluid movement along well from well-adjacent bed zone to day surface for extraction of clogging. Plant for washing wells is used, which is connected to behind-pipe space of well and to tubing pipe. Behind-pipe space of well is isolated by packer along lower limit of perforation range. Perforation range is filled with sedimentation, formed from destroyed rock, and accumulated above packer as a result of gradual and even cleaning of well-adjacent bed zone along whole length of perforation range. Packer is disabled and well is washed clean, without raising tubing pipes column.

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