The processing method of wellbore zone

 

The invention relates to mining and can be used for development and rehabilitation of well production wells. Well equipped tee with valve, with high performance on the opening. Tee through the valve connected to the cylinder, from which pre-evacuated to create a limited amount of vacuum. One of the valves has an exit to the atmosphere. Through a tee with a valve hole connected to a reservoir for fluid. Previously pumped into the well fluid. When moving the fluid through the borehole from the wellbore zone to the land surface release the pressure with the dramatic opening of the cavity well. Open the valve, through which the borehole fluid under pressure fills the container. The fluid impacts against the inner wall of the cylinder and is reflected from it, creating pressure pulses in the near-wellbore area of the formation in the form of a damped standing wave, creating repression-depression impulses. Is the formation of a depression pressure differential between the well bore area of the reservoir and the cavity of the well. In a period of growth depression half carry out the removal of contaminants from the well, the spout of the fluid in the tank. The invention allows in what Finance. 1 Il.

The present 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-resin-paraffin 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 columns persons cleaning wells from deposits in the course of its operation (Veliyev F.,, Kurbanov R. And I. Aliev, 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 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 ZAT is carried out on hearing the noise, in addition, the well shall be closed sharply which is difficult to do manually with a maximum flow rate of a liquid or a valve having a passport trigger time.

The objective of the invention is the formation of a damped standing wave without a connection cavity well with the atmosphere.

The task is solved in that, using the processing method of wellbore zone, 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 moving through the cavity wells and creating repression-depression pulses, 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 of the well, the well equipped tee with valve, with high performance on the opening, and connect through the said tee and one of the valves / cylinder, from which a pre-evacuated to create a limited amount of vacuum, and through the said tee and the other valve, and logicheskie acceptable level, creating 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 creating repression-depression impulses, carried out by combining the cavity wells in the mouth with a limited amount of vacuum, and in a period of growth depression half carry out the removal of dirt from the hole spout downhole fluid in the tank.

This device allows you to restore wells not containing the column tubing, pump and lifting equipment.

An example of a device for the implementation of the proposed method is illustrated in the drawing, on which: 1 - well 2 - pipe annular space; 3 - tee; 4, 5 - valves; 6 - cylinder; 7 - a reservoir for fluid.

Well 1 has a nozzle annulus 2, and also connected through tee 3 and valve 4 cylinder 6, through the tee 3 and valve 5 with capacity for fluid 7, which has an exit to the atmosphere. The valves 4, 5 have a high speed opening speed of the lock-on process is not affected.

The method is implemented as follows. In the well 1 through the pipe annulus 2 pumped fluid and create davlenie layer. From the cylinder 7 pump out the air.

Initially open the valve 4, the downhole fluid under pressure begins to flow and fill the tank. Because of the tank pumped out the air, the speed of the spout is significantly increased, the fluid hits the inner wall of the cylinder and is reflected from it. 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.

For the removal of contaminants from the well in a period of growth depression half open valve 5 to spout the downhole fluid in the tank. During this period of depressed removal of contaminants from the wellbore zone maximum due to the effect of excess pressure in the well. Thus, contamination will actively be carried from the wellbore zone in the cavity of the bore and then through valve 5 into the reservoir for the fluid 7.

Overflow portion of the fluid into the container, close the valves 4 and 5 and drained the fluid from the container. The process is repeated until the desired degree of purification of critical area.

The length and diameter of cylinder 6 is selected from UCI method is applicable for wells equipped with a column of pump-compressor pipes, which connect the tee, and the fluid pumped into the annulus.

When processing the production well is necessary to use a pump unit for pumping fluid into the well and create the necessary pressure, the fluid may contain chemicals for more efficient cleaning. When processing the injection well pressure created by pumping fluid designed to maintain reservoir pressure.

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 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 moving through the cavity wells and creating repression-depression pulses, and the drain pressure when moving the fluid through the borehole from the wellbore zone to the land surface when Reznick performance on opening, and connect through the said tee and one of the valves / cylinder, from which a pre-evacuated to create a limited amount of vacuum, and through the said tee and the other valve is connected to the atmosphere, with capacity for fluid, in the process of pumping fluid into the well to create pressure to technologically acceptable level, 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 creating repression-depression impulses, carried out by combining the cavity wells in the mouth with a limited amount of vacuum, and in a period of growth depression half carry out the removal of dirt from the hole spout downhole fluid in the tank.

 

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21
-d22
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2 ex

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