Thermodynamic method the impact on the bottom zone of the well

 

The invention relates to mining and can be used for development and rehabilitation of well production wells, reduced due to clogging of the formation of tar and asphalt-wax formations. When using thermodynamic method the impact on the bottom zone of the well to increase the pressure of the heating fluid in the isolated packers interval of the well against the reservoir. For this pumped fluid on the circuit: the output submersible borehole pump - hydraulic resistance is isolated by packers interval of the well - log submersible borehole pump until decolletee reservoir and fracturing. Use hydraulic resistance, is capable of changing the flow area depending on the viscosity of the pumped fluid under the action of temperature change. Maintaining optimum flow rate of liquid pumped by the pump when changing the viscosity of the downhole fluid and the presence of mechanical impurities. 1 Il.

The invention relates to mining and can be used for development and no-tar and paraffin formations.

Known downhole choke heater (Degtyarev B. C., Bookkeeper E. B. Fighting hydrates during the operation of gas wells in the Northern areas. - M.: Nedra, 1976), based on the transformation of the energy of the fluid pressure in the warmth.

However, the application of the throttle heater is associated with high costs due to the use of at least three columns, tubing, and low efficiency due to the hydraulic resistance and the pressure loss in the threaded connections of tubing.

There is a method of hydraulic fracturing (Soloviev, N. and other Patent No. 2046184 "Method of hydraulic fracturing", CL. E 21 In 43/26, 1995), in which increased pressure in the isolated section of the layer is carried out by heating the liquid by installing an electric heater.

The drawback is the small amount of energy transmitted in the bottom zone.

The known method the impact on the bottom zone of the oil well (A. Shipulin Century, Zagrivny E. A., Kudryashov B. B. and other Patent No. 2164597, "Thermodynamic effect on the bottomhole zone", CL. E21 In 43/25, in which the heating fluid is produced due to the turbulent motion of the liquid with mechanical stirring.

However estrogen vibration and increase reliability to an acceptable level.

The known method the impact on the bottom zone of the oil well (A. Shipulin Century, Gabdrakhmanov N. X., Mingalev W., and others Patent No. 2176313, "Thermodynamic effect on the bottomhole zone", CL. E 21 In 43/25), taken as a prototype, in which the heating fluid is produced by pumping on the circuit: the output submersible borehole pump - hydraulic resistance is isolated by packers interval of the well - log submersible borehole pump.

However, the number of stages of the hydraulic resistance and the cross-section of the calibrated holes in the speed is constant, and the downhole fluid changes its viscosity on temperature and also on the number and concentration of asphalt-resin-paraffin components of the fluid oil reservoir, which complicates the adjustment (with lifts equipment on the surface and contributes to the clogging of channels of hydraulic resistance.

Object of the invention is the maintaining optimal flow rate of the pump when changing the viscosity of the downhole fluid and the presence of mechanical impurities.

The task is solved in that at thermodynamic impact on bottom-hole zone of the well, including an increased pressure of the heating fluid from the output submersible borehole pump - the hydraulic resistance is isolated by packers interval of the well - log submersible borehole pump to achieve its decolletee and use of hydraulic fracturing hydraulic resistance, is capable of changing the flow area from the viscosity of the pumped fluid under the action of temperature changes.

An example of a device for implementing the proposed method is illustrated by the drawing, which is 1 - well 2 - submersible pump; 3 - hydraulic resistance; 4 - packer; 5 - membrane with a hole and a valve seat; 6 - ball; the arrows show the direction of fluid circulation.

The method is implemented as follows. In the well 1 to the depth of the productive formation lower series-connected submersible pump 2 and the hydraulic resistance 3. The area of the borehole with electric pump and hydraulic resistance isolated by the packer 4.

With the inclusion of a submersible pump fluid circulates through the loop: the output of the downhole pump - hydraulic resistance - isolated zone of the well is the sign of a submersible pump. With the passage of fluid through the hydraulic resistance of the heat, that is conversions the * section, for example, if it has one or more consecutive membranes with calibrated holes, use design ball valve. A calibrated orifice membrane has a saddle 5, above which is located the ball 6. The ball is pressed against the seat by a spring or its own weight.

If the viscosity of the downhole fluid increases, the modified Reynolds number

where v is the velocity of the fluid;

d - diameter of the channel;

the density of the liquid;

is the dynamic viscosity of the fluid.

The Reynolds number, in turn, affects the resistance coefficient

where-coefficient of resistance;

a - constant;

the coefficient in quadratic mode (in the zone of developed turbulence).

The magnitude of the coefficient depends on the pressure difference across the hydraulic resistance

whereP is the pressure difference across the hydraulic resistance, good discharge performance the information degree thanand the velocity of a fluid.

By increasing the viscosity of the liquid flowing through the ball valve, the gap between the seat and the ball due to the pressure differential increases, the value decreases the hydraulic resistance, the velocity of a fluid and, consequently, the flow rate of the pump are to the optimal value.

Decreasing the viscosity of the liquid, the gap between the seat and the ball, respectively, decreases.

In case of contact with particles of high viscosity or solids it shifts the ball and passes through the enlarged gap, reduces the possibility of blockage of the holes of the hydraulic resistance.

Selection of hole diameter, number of stages, as well as springs or balls of a certain weight maintain optimum performance of the pump, independent of changes in fluid viscosity.

Possible other designs orifice of variable cross-section, for example, a hole with a spring-loaded, turned back edges.

The advantages of the proposed method is to increase reliability, reduce the likelihood of accidental lifting equipment due to the blockage of the holes of the membrane, possible

Chugaev R. R. Hydraulics (technical mechanics of fluids). - 4th ed., supplementary and processed - L.: Energoizdat. Leningrad. separa-tion, 1982, 672 S., Il.

Claims

Thermodynamic method the impact on the bottom zone of the well, including an increased pressure of the heating fluid in the isolated packers interval of the well against the productive formation by pumping fluid through the circuit: the output of the submersible borehole pump - hydraulic resistance is isolated by packers interval of the well - log submersible borehole pump to achieve its decolletee, as well as fracturing, characterized in that use hydraulic resistance, is capable of changing the flow area from the viscosity of the pumped fluid under the action of temperature changes.



 

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