Method for processing well-adjacent bed zone

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.

EFFECT: higher efficiency.

1 dwg, 1 ex

 

The present invention relates to mining and can be used for development and recovery rate ekspluatatsionnykh wells, reduced due to clogging of 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, BC, Abdullin MM 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 (G.A. eagles, Khusainov V.M., Musabirov -, Pestrikov VI 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 otlozhenii is in the process of its operation (Veliyev F.G., Kurbanov R.-I., Aliyev E.N., Patent No. 1700207, CL E 21 In 37/00), which periodically generate at the wellhead wave of negative pressure, which overlap with the gate valve in the discharge line and stand her in the blocked state, then 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 NB 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 through the cavity wells and grazing pressure during the movement of fluid through the bore of the wellbore zone to the land surface with a sharp opening of the cavity of the well.

However, particles are extracted from the perforation of the well and wellbore zone unevenly, after clicks the processing remain kolmat zone.

The objective of the invention is to clean the area of the formation adjacent to a well bore zone along the length of the perforation interval.

The task is solved in that, using 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 for cleaning mentioned wellbore zone 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 grazing pressure during the movement of fluid through the bore of the wellbore zone to the land surface for the removal of contaminants using plants for washing the wells, the installation for washing the wells connected to the annular space of the well and to pump-compressor pipe, the well annulus isolated by the packer at the bottom of the perforated interval and, to the extent filling the perforated interval the precipitate formed from the destroyed rocks and accumulate above the packer in the gradual and uniform cleaning wellbore zone along the entire length of the perforation interval, turn off the manifold and rinse well without lifting the tubing Tr is B.

This method allows to increase the turnaround time of the well due to better decolletee wellbore zone.

An example of a device for the implementation of the proposed method is illustrated in the drawing, on which: 1 - tube annulus; 2 - tubing; 3 - manifold; 4 - residue.

The method is implemented as follows.

Installation for washing the wells connected to the annular space of the well through the pipe 1 and pump-compressor pipe 2. The annulus is isolated by the packer 3 on the bottom of the perforated interval.

In a well with pump installed through the pipe annulus 1 pumped fluid and create pressure that is safe for the integrity of the 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 expiry of block fluid flow. Is formed by the pressure wave, which moves along the cavity wells from the mouth to the bottom 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, and create cracks in skeletally and to break its fragments.

The formation of a standing shock wave also may impact the application of pressure to the surface of the downhole fluid at the wellhead, while the packer serves as a diverter shock wave and sends it to the near-well zone of the reservoir through the lower part of the perforated interval.

After the decay of the standing shock wave produce a flow of wellbore fluid to move viscous contaminants, solids and debris of the destroyed rocks from borehole zone in the cavity of the well, and the light components of the impurities float to the surface, fragments of destroyed rocks and solids accumulate above the packer, forming sludge 4.

When you re-formation of the shock wave and its passing through annular space whipstock is 4 sediment removed from the reservoir fragments of destroyed rock and solids. The processing of the perforation and the reservoir area above the sediment 4. Thus, the accumulation of sediment 4 is a gradual and uniform processing of wellbore zone along the length of the perforation interval.

As it is filled with sediment of the perforation interval, which is reflected in a sharp increase of the resistance of the injection fluid or by changing the strength of the reflected shock wave off the packer and carry out direct or backwash well, without looking up the th column of tubing. The processing and washing is repeated until the desired degree of purification of critical area and cavity wells from viscous and solid components of dirt.

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.

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 for cleaning mentioned wellbore zone 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 grazing pressure during the movement of fluid through the bore of the wellbore zone to the land surface for the removal of contaminants using plants for washing the wells, characterized in that a device for washing the wells connected to the annular space of the well and to pump-compressor pipe, annulus well isolated by the packer at the bottom of the perforated interval and at least fill the perforated interval the precipitate formed from the ruin which Noah rocks and accumulate above the packer in the gradual and uniform cleaning wellbore zone along the entire length of the perforation interval, turn off the manifold and rinse well without lifting the column tubing.



 

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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

The invention relates to the oil industry
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2 ex

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EFFECT: higher efficiency.

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EFFECT: increased intensity of production bed treatment and extended operational functionality.

23 cl, 2 ex

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