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. The processing method of wellbore zone includes a sealed closing of the well, creating at the wellhead periodic negative pressure waves in the borehole overlapping, time delay and the subsequent opening of the discharge pipe. Well up to the mouth and squeezing the liquid. Hermetic closing well carry out the faceplate. Create additional wellhead periodic waves of positive pressure by lowering the level of the liquid column due to the application of the standard pressure of the compressed air. To do this, open the valve in the incoming pipe is inserted into the faceplate, cover, and then open the discharge nozzle, is also inserted in the faceplate of his valve. The closing of the valve in the incoming pipe is carried out in the moment of the maximum reduction in the level of the liquid column. The technical result - wave amplification positive and negative pressure to impact the well bore is s refers 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.

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 method of processing bottom-hole formation zone (Dyblenko Century. P, Marchukov E. Yu, oderzhivayut it for some time, then quickly reduced, which open turns, and include the jet pump, when the pressure to produce microwave effect hydrodynamic generator.

However, the method requires the use of the column tubing, packer, jet pump, hydrodynamic generator tripping equipment.

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, 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, for the formation of a damped standing wave is used only the energy of the fluid flow flowing from the well.

A known method of cleaning wells from deposits in the course of its operation (Veliyev and the wellhead wave of negative pressure, why block 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, that is not enough for the formation of powerful waves, in addition, you must use the column tubing and pump to ensure its power.

Object of the invention is the amplification of waves of positive and negative pressure effects on the near-well zone of the reservoir without the use of submersible equipment.

The task is solved in that, using the processing method of wellbore zone, including hermetic closing of the well, creating at the wellhead periodic negative pressure waves in the borehole overlapping, time delay and the subsequent opening of the discharge nozzle carried out filling in the hole and squeezing the fluid-tight closing of the wells is performed by the face-plate, into which is inserted equipped with valves incoming pipe and attached to the vessel and connected to atmosphere discharge pipe, additionally create at the wellhead periodic wave positive on the bones by the application of the standard pressure of the compressed air by opening the valve in the incoming pipe and its subsequent closure, the overlap and the opening of the discharge pipe shall exercise its valve, and the closing of the valve in the incoming pipe is carried out in the moment of the maximum reduction in the level of the liquid column.

This device allows you to restore the well of the old Fund, does not have a column tubing, pump and lifting equipment.

An example of a device for the implementation of the proposed method is illustrated by the drawing, which is 1 - well 2 - faceplate; 3 - inlet pipe; 4 - flow pipe; 5 and 6 valves; 7 - capacity for liquids.

The method is implemented as follows. In the well 1 up and squeezing the liquid (e.g. water) and tightly closed her faceplate 2, into which is inserted the incoming 3 and flow 4 nozzles with valves 5 and 6. Flow nozzle has an exit to the atmosphere and connected to the vessel for the liquid 7, which is necessary to prevent ejection of the well fluid on the ground according to environmental requirements.

In the initial state to the inlet pipe connecting the cylinder with compressed air, both valves are closed. Initially open the valve 5, the compressed air sharply raises the pressure under the faceplate 2. Is formed by the pressure wave that moves from the mouth to the bottom and then cernium 1 kg/cm2decreases in volume at 1/20000 share. When in long and narrow vessel, as well, by the application of standard pressure cylinder (150 bar) fluid level decreases due to compression on a few meters.

In the moment of the maximum lowering of the spout close the valve 5 and open valve 6. The pressure at the wellhead drops sharply, forming a wave of negative pressure that moves from the mouth to the bottom and then through the perforations in the near-wellbore area of the formation. The level of elasticity of the fluid and viscous components of the formation fluid increases, the compressed air and the liquid are ejected from the well. Depression may be accompanied by rupture of the fluid if the flow from the reservoir obstructed or missing. As a result of formation of the effective impact of depression on the layer cleans the bottom zone due to the removal of impurities accumulating in the wellbore area.

Due to the inertia of the liquid column continues oscillatory motion, to facilitate the flushing of wellbore zone and restoration of its permeability. If necessary, repeat the process.

The applying method is very cheap. Of equipment required faceplate with valves, multiple cylinders and to the manual is applicable for wells equipped with a column tubing, which change the design of the faceplate and is called the pulse pressure fluid within the tubing string either in the annular space, if the tubing is occupied by the pump or other equipment.

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, including hermetic closing of the well, creating at the wellhead periodic negative pressure waves in the borehole overlapping, time delay and the subsequent opening of the discharge pipe, characterized in that exercise filling in the hole and squeezing the fluid-tight closing of the wells is performed by the face-plate, into which is inserted equipped with valves incoming pipe and attached to the vessel and connected to atmosphere discharge pipe, additionally create at the wellhead periodic waves of positive pressure, moreover, periodic waves of positive pressure in the borehole creates a lowering of the liquid column due to the application of the standard pressure of compressed air and exercise its valve, the closure valve in the incoming pipe is carried out in the moment of the maximum reduction in the level of the liquid column.

 

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