The processing method of wellbore zone

 

The invention relates to mining and can be used for development and rehabilitation of well production wells, reduced due to clogging of wellbore zone of asphalt formations and solids. Connect the machine for washing the wells to the annular space and to pump-compressor pipe. Processing time includes the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well prior injection of fluid into the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave moving through the annular space of the well, and the drain pressure when moving the fluid through the borehole through the annulus of the well. The processing periods alternating with flushing of the borehole using the machine for washing the wells connected to the annular space and pump-compressor pipe. The use of the invention provides a comprehensive treatment of cavity wells and parcel of the formation adjacent to a well bore zone. 1 Il.

The alleged invention relates to mining and can blythii wellbore zone of asphalt formations and solids.

A method of processing wellbore zone and device for its implementation (agliullin M. N., Kurbanov A. S., Rakhmatullin R. H., Abdullin, M. M. Patent No. 2123591, CL E 21 In 43/25), which produce simultaneous physical and pulse depression-repressione effect to stabilize the current values of hydroconductivity.

However, the method requires the use of the column tubing, descent equipment and cable using winches, etc.

A method of processing bottom-hole formation zone (Orlov, A., Khusainov C. M., Musabirov M. H., Pestrikov Century. And. Patent No. 2169821, CL E 21 In 43/25), which descend into the well implosion device, upload the processing composition, push it into the formation, conduct cleanup by creating multiple implosion effect.

However, the method requires the use of the column tubing, packer, implosion device, the processing composition, etc.

A known method of cleaning wells from deposits in the course of its operation (Veliyev F. G., R. Kurbanov A-I. Aliev, E. N., Patent No. 1700207, CL E 21 In 37/00), which periodically generate at the wellhead wave denier is open.

However, the maximum change in pressure from a hydraulic shock when opening the flow line is 1.5 MPa for a fraction of a second, which is insufficient for the formation of a powerful wave, in addition, you must use the column tubing and pump to ensure its power.

The known method development and purification wellbore zones pulsed drainage (Nosov P. I., Stockin P. D., Nurislamov N. B. and other Patent No. 2159326, CL E 21 In 43/25), taken as a prototype, in which the formation of the depression pressure differential between the well bore area of the reservoir and the cavity of the well is made by pre-injection of fluid into the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave moving in the cavity of the well, and the drain pressure when moving the fluid through the borehole from the wellbore zone to the land surface with a sharp opening of the cavity well.

However, after the spout of the well fluid in the cavity wells remain polluted particles, of which a large sink to the bottom of the well, and the small remains in suspension and continuation of the operation of cleaning or pumping liquid again settle plasta, adjacent to the wellbore area.

The task is solved by the fact that applying the processing method of wellbore zone containing processing time, including the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well, by pre-injection of fluid into the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave that moves through the borehole, and the drain pressure when moving the fluid through the borehole from the wellbore zone to the land surface, creating a damped standing wave that moves through the borehole, and the drain pressure when moving the fluid through the borehole from the wellbore zone to the land surface is carried out in the cavity of the annulus of the well, periods processing, including the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave moving in the cavity of the annulus of the well and the drain pressure when moving the fluid in the annular cavity wells alternating with flushing well, issarny pipe.

This method allows you to display the adsorption sediment pore channels wellbore zone in the cavity of the hole, then remove them using the standard installation for washing wells.

An example of a device for implementing the proposed method is illustrated by a drawing (schemes a and b), where: 1 - tube annulus; 2 - tubing; 3 - near-wellbore reservoir zone. The arrows in the diagram and drawing show the direction of motion of a standing shock wave, the arrows in the diagram b shows the direction of flow of fluid when washing the wells.

The method is implemented as follows. Installation for washing the wells connected to the annular space of the well through the pipe 1 to the pump-compressor pipe 2.

In a well with pump installed through the pipe annulus 1 or pump-compressor pipe 2 pumped fluid and create pressure that is safe for the integrity of the tubing, casing and cement. Under the action of excess pressure fluid penetrates into the near-wellbore area of the formation.

For the formation of a standing shock waves open cavity annulus and when sufficient speed is reached the expiration fou and back, creating beats, including in the near-wellbore area of the formation. Repression-depression pulses allow you to break the adsorption deposits on the walls of the pore channels.

The formation of a standing shock wave also may impact the application of pressure to the surface of the downhole fluid at the wellhead.

After passing through the oscillation of a standing shock wave produce a flow of wellbore fluid to the depressed removal of contaminants from the wellbore zone. Pollution is actively brought into the cavity of the well and the fluid flow is moved to the mouth, and light pollution particles float to the surface, heavy settle in the sump well, fine and colloidal disperse and remain suspended in the borehole fluid. In addition to contamination from near-wellbore zone in the cavity wells are pollution, broken shock wave from the walls of the casing and tubing.

Periodically between the cleaning pore channels wellbore zone rinse well. The process is repeated until the desired degree of purification of critical area and cavity well.

Installation for washing the wells has a set of equipment, access to the Lasta and cavity wells, to create a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave, to bleed pressure when a sudden opening of the cavity wells, and to create impact pressure on the surface of the downhole fluid. Additional equipment is not required.

The fluid may contain chemicals for more efficient cleaning. The method can be applied in conjunction with other types of bottomhole zone treatment: acid, heat, vibroimpulsnoj, acoustic, etc.

Claims

The processing method of wellbore zone containing processing time, including the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well prior injection of fluid into the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave that moves through the borehole, and grazing pressure during the movement of fluid through the bore of the wellbore zone to the land surface, characterized in that the creation of a damped standing wave that moves through the borehole, and the drain pressure when moving the fluid through the borehole from Pris processing, including the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well, creating a periodic pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave moving in the cavity of the annulus of the well and the drain pressure when moving the fluid cavity to the annular space of wells alternating with flushing of the borehole using the machine for washing the wells connected to the annular space of the well and to pump-compressor pipe.

 

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SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

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21
-d22
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EFFECT: higher safety, higher efficiency.

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EFFECT: higher efficiency.

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FIELD: oil industry.

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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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