The method of liquidation of oil deposits in the well

 

The invention relates to mining and can be used to restore the production rate of wells falling due to buildup on the walls of the tubing asphalt formations (ASPO). The method of liquidation of deposits in the borehole includes a descent to the cable cleaning device that includes a pump, to the sediment surface, the promotion of the cleaning unit through ASPO under the action of gravity, pumping of liquid through the cleaning device in the direction to the place of destruction deposits with variable pressure and use the shock effect of the jet of the downhole fluid. Use a clearing device, optionally containing hydropneumoaccumulator filled is placed in an impenetrable shell of gas that is associated with the channel through the ball valve with the pump. Below hydropneumoaccumulator consistently have the pressure valve. Use a pump with high pressure and small flow rate. Pumping the well fluid through the cleaning device in the direction to the place of destruction deposits with variable pressure and use the shock effect of the jet of the well fluid is carried out by injection into hydropneumoaccumulator, its compression pressure of gas in it and vybrasyvaetsya impact energy fluid washout ASPO, improves the quality of cleaning well. 1 Il.

The invention relates to mining and can be used to restore the production rate of wells falling due to buildup on the walls of the tubing of oil (ASPO) deposits.

Known “Method of thermal destruction of hydrate plugs in the well” (Kurtov C. D., Patent No. 1796010, E 21 In 37/00), including the descent of the hollow column, equipped with a check valve in the tubing, heating the washing liquid, forcing her into a hollow column, equipped with a jet tip.

However, heating of the washing liquid is on the surface and requires significant power to maintain the required temperature in the ruin of the hydrate deposits.

Known “Method of elimination asfaltosmesitelnyh tubes in the well” (Shalaev, H., Fataliyev E. W., Patent No. 1816849, E 21 In 37/00), including the descent on the cable of the heating device to the surface of the tube, filling the borehole fluid with hydrophobic additives, seal the mouth, the heating tube, the promotion of the heating device to lead the agreve tube and there is no circulation of liquid around the heating device.

A known method of cleaning the well or channel from gas hydrates (patent PCT WO 98/54440, 21 In 37/00, 36/04, 37/06), including input into the borehole heater, moving under the action of gravity for melting the hydrate plugs, pumping fluid through the heater towards the ruin of hydrate plugs with the possibility of fluid circulation along the contour of the inside and the outside of the heater.

However, the liquid coming from the lower part of the heating device, rises up along the body of the heater, slightly penetrating into the thickness of the hydrate; no effect of mechanical erosion of the stream of fluid, in addition, the laminar flow of fluid along the body of the heater has little effect on the cleaning of the walls of the well.

A known method of cleaning a well bore (N. Andrianov.And., Patent No. 2168603, E 21 In 21/00, E 21 In 37/00), which with the help of a giant with the crevice tool is lowered to the lower limit of cleaned interval, form a continuous jet stream of washing fluid in the direction of the axis of the pipe string between the outer surface of the motor and the borehole wall.

However, in the destruction of the rocks required drillstring for supplying drilling fluid to the surface.

WPI is. and others, Patent No. 2180699, E 21 In 43/114), engaged in the destruction and removal of rocks of the productive formation of the high-pressure jet of fluid with abrasive supplied through truepromise nozzles downhole jetting. When the abrasive is separated from the slurry for reuse in the well.

However, in the destruction of the rocks required drillstring for supplying drilling fluid to the surface.

Known method of elimination of asphalt, resin and paraffin deposits (ARPD) in the borehole (Shipulin A. C., Kozhemyakin Y. D., Patent No. 2186200, E 21 In 37/00), taken as a prototype, including descent by cable heater to the sediment surface, pumping downhole fluid through the heater towards the ruin of the deposits with the possibility of circulation along the contour of the inside and outside of the heater variable pressure and use the shock effect of the jet of liquid.

However, the impact force of the fluid is ineffective for the implementation of the erosion and removal of sediment.

The objective of the invention is to increase the impact energy of a liquid for washing of deposits, improving treatment of wells.

The task is solved in that in the application of the method of liquidation of deposits in the borehole, including the descent into the well to the surface of the paraffin on Gruzian gravity, pumping the well fluid through the cleaning device in the direction to the place of destruction deposits with variable pressure and use the shock effect of the jet of the well fluid, use a clearing device, optionally containing hydropneumoaccumulator filled is placed in an impenetrable shell of gas that is associated with the channel through the ball valve with the pump, and consistently below hydropneumoaccumulator valve pressure using a pump with high pressure and small flow rate, pumping downhole fluid through the cleaning device in the direction to the place of destruction deposits with variable pressure and use the shock effect of the jet of the well fluid is carried out by injection into hydropneumoaccumulator, compression the pressure of gas in it and the ejection pressure of the compressed gas to destroy ASPO upon reaching the set pressure of the valve pressure.

This device allows you to apply the principle of operation of hydrom-pulsator-drive used in the mining and coal industries.

The device for realization of the proposed method, illustrated by drawings, where: 1 - tubing, 2 - carrying cable, 3 - pump, 4 - saravana the direction of fluid circulation.

The method is implemented as follows.

In the well 1 using the carrying cable 2 lower a cleaning device that includes a pump 3, which through the ball valve 4 and channel 5 is hydropneumoaccumulator 6, gas-filled. Below hydropneumoaccumulator 6 in the device consistently have the pressure valve 7 and a jet nozzle 8. Power supply through the load-carrying cable includes a pump 3 and through the ball valve 4 and channel 5 pumped downhole fluid in hydropneumoaccumulator 6. The pressure of the well fluid compresses the gas which is in hydropneumoaccumulator 6. Upon reaching the pressure valve pressure 7 fluid pressure of the compressed gas through the nozzle jetting nozzle 8 is thrown to destroy ARPD. At the time of ejection of the liquid from hydropneumoaccumulator ball valve is closed to oncoming fluid flow.

Particles of paraffin dissolved, washed blows borehole fluid and having small compared with water specific gravity, rises to the top of the well.

On the velocity of the downhole fluid depends on its penetration into the underlying layers of sediment. The impact force of the jet creates a turbulent movement of the downhole fluid at everything and wells of paraffin.

Since the method is based on periodic accumulation of potential energy, as an energy source use the pump with high pressure and small flow.

To avoid dilution gas hydropneumocompensator in the downhole fluid under pressure it is placed in a flexible impermeable membrane.

To enhance the impact of a jet of liquid paraffin may include a device to implement the method of the heater.

The described method is the elimination of ASPO allows efficient use of pump power due to a pulse of concentrated use his energy.

Claims

The method of liquidation of asphalt, resin and paraffin deposits in the borehole, including the descent into the well to the surface of the ARPD for carrying the cable cleaning device that includes a pump, the promotion of the cleaning unit through ASPO under the action of gravity, pumping downhole fluid through the cleaning device in the direction to the place of destruction deposits with variable pressure and use the shock effect of the jet of the downhole fluid, wherein the use of the clearing device, optionally containing hydropneumoaccumulator, sledovatelno located below hydropneumoaccumulator pressure valve, use a pump with high pressure and small flow rate, pumping downhole fluid through the cleaning device in the direction to the place of destruction deposits with variable pressure and use the shock effect of the jet of the well fluid is carried out by injection into hydropneumoaccumulator, its compression pressure of gas in it and the ejection pressure of the compressed gas to destroy ASPO upon reaching the set pressure of the valve pressure.



 

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FIELD: oil extractive industry.

SUBSTANCE: device has pit-face cutting valve and mounting tool. Cutting valve has body, packer with check valve and perforated tail. Mounting tool has hollow rod, connected by shear elements to expanding cone of packer, lower and upper bodies. Lower body is provided with self-compacting collar, and upper - through tubing string of limited volume and sleeve is connected to drop valve cylinder. Valve rod is connected to rope, on which device is lowered into well. Hollow rod and tubing string form depression chamber being at constant atmospheric pressure. Rod has upper and lower shelves. On shelf of upper body expander of self-compacting collar having longitudinal grooves is mounted. After raising of mounting tool from well packer, body with tail and check valve remain in it. Then a pump is lowered into well.

EFFECT: lower costs.

3 dwg

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