RU2653194C1 - Complex water treatment device - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas production industry, namely to devices used for the complex exposure to productive formation. Device for complex treatment of wells contains a rotor and a stator with holes, a bearing assembly. Holes in the rotor are cylindrical and are located along the vertical generatrix of the rotor along a tangent to its internal surface. Moreover, the rotor is rigidly connected to the upper and lower sliding bearings with the possibility of sliding along the outer surface of the stator, and along the entire length of the rotor a flat cut is made to ensure imbalance of the rotor. In the cross section, the rotor has the form of a circle with a cut off segment. In this case, the stator is rigidly connected to the axis on which the bearing is mounted, resting on the upper spring stop for moving the rotor, which in turn rests on the lower stop. And the number of all holes in the rotor and stator is determined based on the lowest hydraulic losses.

EFFECT: technical result is an increase in the efficiency of the treatment of the bottom-hole formation zone due to the design features of the device, allowing to carry out a water jet washing with simultaneous impulse processing of a formation, acid and foam acid treatment of the formation, fracturing the formation, and then pumping the proppant through the working elements of the device.

1 cl, 1 dwg

Description

The invention relates to the oil and gas industry, and in particular to devices for the integrated impact on the reservoir.

A device for the integrated treatment of productive formations, including a jet pump and a packer installed on a string of tubing. The device further comprises a slotted perforator installed in the lower part of the tubing string (RF patent No. 92466, IPC E21B43 / 25, publ. March 20, 2010). The disadvantage is the lack of processing efficiency due to limited functionality.

A device for processing the bottom-hole zone of a well is known, which is a complex downhole tool including an acoustic emitter excitation generator controlled by a borehole hydrodynamic pressure sensor with a system of suction radial channels in the housing between them. Radial channels communicate with the implosion chamber through an inlet valve controlled by a thermoplastic stopper using an electric heater (RF patent No. 2180938, IPC E21B 43/25, publ. 03/27/2002).

The disadvantage is the complicated design.

Known hydraulic device spool type (reference book on oil production. –M .: Nedra, 1974 / Edited by Sh.K. Gimatudinova, p. 419). The device contains a rotor and a stator, closely ground to each other (with a minimum gap). In the rotor and stator there are slots, bearing and sealing units. The device is taken as a prototype.

The disadvantages are as follows. The device creates oscillations by periodically shutting off the flow of the working fluid flowing through the spool device. Due to the short-term coincidence of the holes in the stator and the rotor at the outlet of the device, the flow energy does not have time to reach its maximum value, therefore, the efficiency of well treatments will decrease slightly.

The objective of the invention is to increase the efficiency of processing the bottom-hole zone of the formation due to the design features of the device, allowing hydromonitor washing with simultaneous pulse treatment of the formation, acid and foam acid treatment of the formation, fracturing, followed by pumping of a proppant through the working bodies of the device.

The problem is solved, and the technical result is achieved by a device for integrated treatment of wells, containing a rotor and a stator with holes, a bearing assembly. Unlike the prototype, the holes in the rotor are cylindrical and are located along the vertical generatrix of the rotor tangentially to its inner surface, and the rotor is rigidly connected to the upper and lower sliding bearings with the possibility of sliding along the outer surface of the stator, and a flat cut is made along the entire length of the rotor to ensure rotor imbalance, and in cross section the rotor has the form of a circle with a cut off segment, while the stator is rigidly connected to the axis on which the bearing is mounted, resting on the upper stop They can be used to move the rotor, which in turn rests on the lower stop, and the number of all holes in the rotor and stator is determined based on the smallest hydraulic losses.

The technical result is achieved as follows.

The complex well treatment device allows you to perform several technological operations with one descent into the well:

1. Hydromonitor washing with simultaneous pulse treatment of the formation.

The rotor has holes that are cylindrical and located along the vertical generatrix of the rotor tangentially to its inner surface. When flowing out of these holes, the liquid becomes a pulsed rotating high-speed jet, the energy of which is converted into a high-speed head acting on the object being processed (productive formation). Due to the hydro-jet exchange with the skeleton of the formation, it is intensively cleaned of mechanical impurities and products of calcination and brought to the surface. Thus, a pulsed rotating high-speed jet is used to increase the efficiency of the process to increase well productivity.

2. Acid and foam acid treatment of the reservoir.

 Possibility of injection through additional openings of the stator when the rotor moves down due to compression of the spring (with a maximum mode of pumping liquid through the generator 8-10 l / s) In this case, acid and other reagents can be injected into the treated formation to clean the bottomhole zone and the inner surface of the casing from salts, solids and asphalt-resinous paraffin deposits (AFS).

3. Fracturing with subsequent injection of a proppant (proppant) at a lower pressure due to stiff vibration.

 Due to the use of unbalanced vibrational rotation of the rotor having a “B” cut (in cross section, the rotor has the form of a circle with a cut off segment, the area of which does not exceed 30% of the area of the circle to ensure imbalance of the rotor), a severe vibration is formed, which allows to increase the "effect" the impact of pulsed forces on the treated object in the initial and subsequent stages of well treatment. This, in turn, allows formation of new cracks in the formation (or expansion of existing ones), which, when combined with others, become oil and gas conductors connecting the well with the productive zones of the formation remote from the bottom, which increases the permeability of the formation. A fracture without vibration is achieved at a pressure of 50-70 MPa and with a flow rate of up to 30 l / s, and with vibration at a pressure of 25-35 MPa with the same flow rate.

The invention is illustrated in the drawing, which shows the inventive device.

The device, lowered into the well on the tubing 1, contains a rotor 2, a stator 3, the rotor is rigidly connected to the upper and lower bearings, respectively 4 and 5 with the possibility of sliding on the outer surface of the stator, the stator is rigidly connected to the axis on which it is planted bearing 6, resting on the upper stop 7 of the spring 8 for moving the rotor, which in turn rests on the lower stop 9. Position 10 indicates a plug for regulating the throughput of the holes in the rotor, 11 - upper stop weld ring, 12 - nut with locknut, 13 - packer.

In addition, the drawing indicates:

A - holes in the stator;

B - holes in the rotor;

In - a slice of the rotor made along its entire length, as shown in the drawing;

G is the annular space (cavity) between the inner surface of the rotor and the outer surface of the stator;

F1 is the annular cross-sectional area between the inner surface of the rotor and the outer surface of the stator;

F2 is the annular cross-sectional area between the inner surface of the rotor and the outer diameter of the axis of the stator.

Integrated processing of the well using the inventive device is as follows.

Initially, a jet monitor flush is performed with simultaneous pulse treatment of the formation. After the device is lowered in an arrangement with a packer 13 on the tubing 1 at a predetermined interval of the processed well, when the packer is not planted, liquid is pumped with a flow rate of pumping equipment of 8-10 liters per second. The working fluid from the cavity of the tubing 1 passes through the holes "A" of the stator 3, enters the annular space "G" between the stator and the rotor, then into the cylindrical holes of the rotor "B". The holes in the rotor are drilled along the generatrix of the vertical (tangent to the inner surface) based on the maximum required fluid flow rate - 8-10 l / s. The diameter of the holes may be 5-10 mm based on the required rate of fluid flow from the hole. The flow rate from the hole is selected within 8-10 m / s based on the maximum fluid flow rate of 30 l / s, with the number of holes 5-15 pcs. The throughput of the holes "B" is regulated by screwing the plugs 10. The flow rate for each hole is 1.5-2.0 l / s. Due to the reaction of a continuous jet flowing out of the rotor holes 2, the rotor receives an unbalanced rotational impulse motion transmitted through the surrounding fluid to the formation being treated. Intensive cleaning of the bottom-hole zone of the formation from mechanical impurities and squatting products is carried out.

Next, the packer 13 is planted at a predetermined interval and fluid injection continues through tubing 1 into the device cavity with a fluid flow rate of 8-10 liters per second, the device works and acts on the reservoir. As reservoir throughput increases, fluid flow increases to well treatment. With an increase in flow, the pressure in the cavity “G” of the device increases, and the compression of spring 8 increases (since the annular cross-sectional area F2 between the inner surface of the rotor and the outer diameter of the stator axis is larger than the annular cross-sectional area F1 between the inner surface of the rotor and the outer surface of the stator) and moving the rotor 2, rigidly connected with the sliding bearings 4 and 5, on the outer surface of the stator 3 down. At the same time, the upper stator openings “A” open, allowing a larger volume of liquid with agents to pass through the rotor. In this case, acid and other reagents can be injected into the treated formation to clean the bottomhole zone and the inner surface of the casing from salts, solids and asphalt-resinous paraffin deposits (AFS). Increasing the permeability of the formation is achieved through the use of unbalanced oscillatory rotation of the rotor having a cut "B", which allows you to increase the "effect" of the impact of pulsed forces on the processed object. This, in turn, allows the formation of new cracks in the formation (or expansion of existing ones), which, when combined with others, become conductors of oil and gas, connecting the well with productive zones of the formation remote from the bottom.

Thus, the invention allows to increase the efficiency of processing the bottom-hole zone of the formation due to the design features of the device, allowing for hydromonitor washing with simultaneous pulse treatment of the formation, acid and foam acid treatment of the formation, fracturing, followed by pumping of a proppant through the working bodies of the device.

Claims (2)

A device for complex treatment of wells, comprising a rotor and a stator with holes, a bearing assembly, characterized in that the holes in the rotor are cylindrical and are located along the vertical generatrix of the rotor tangentially to its inner surface, the rotor being rigidly connected to the upper and lower sliding bearings sliding along the outer surface of the stator, and along the entire length of the rotor a flat cut is made to ensure imbalance of the rotor, and in cross section the rotor looks like a circle with a cut off ment, the stator rigidly connected to the axle on which is seated a bearing supported on the upper spring stop for the movement of the rotor, which in turn rests on the lower abutment, with the number of holes in the rotor and the stator is determined from the smallest hydraulic losses.

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