Method for supply of inhibitor in thermoplastic matrix and device for its realisation

FIELD: oil and gas production.

SUBSTANCE: group of inventions relates to oil industry, in particular may be used to supply inhibitor of salt deposits onto surface of submersible electric motors and input of electric centrifugal pumps. Method includes arrangement of inhibitor in cylindrical vessel with channels in upper part of body, lowering vessel into well, dilution of inhibitor, its withdrawal from vessel. Inhibitor is mixed with viscous matrix substance to form hydrophobic thermoplastic mix, density of which exceeds density of bed fluid. After lowering of vessel into well, mixture is heated up to ambient temperature. After heating mixture is taken out of vessel via dosing hole under action of terrestrial gravitational field. Mixture is diluted in working chamber by diffusion method with further transfer of diluted inhibitor into bed fluid. Working chamber is installed below cylindrical vessel, and vortex motion of bed fluid is arranged inside.

EFFECT: increased efficiency of inhibitor supply process.

5 cl, 1 dwg

 

The invention relates to the oil industry, in particular to the submersible device for conveying the scale inhibitor on the surface of the submersible motor and the input electrical submersible pumps, and can be used to improve the reliability of ESP.

There is a method of filing of the scale inhibitor to the input submersible installations for the production of reservoir fluids, including the production of inhibitor in the form of granules, the placement of the inhibitor inside the container, creating a forced circulation through the container part of the reservoir due to fluid velocity head, passed through a mixing container portion of the fluid from the main flow (ed. St. USSR №1167307, EV 43/00, 1983).

The disadvantage of this method is a little time, because most of the inhibitors are quickly dissolved in the formation fluid flow during the washing.

The closest to the technical nature of the claimed method is a method of supplying a water-soluble inhibitor encased in a thermoplastic matrix, soluble only in hydrocarbons, input submersible installations for the extraction of formation fluid, comprising preparing a thermoplastic mixture containing the inhibitor, the formation of a mixture of cylindrical blocks, placing them with the education gap within the cylindrical body, with RA the territorial holes on the side walls, the descent of the casing in the well, dissolving the mixture with inhibitor formation fluid flow passing between the blocks and the housing (patent RF №2227206, EV 37/06, 2004).

The disadvantage of this method is the impossibility of its use in wells with a high temperature for a long time because of the intense dissolution of the mixture, since the dissolution rate is proportional to the diffusion coefficient and the concentration gradient at the surface of the dissolved substance. The diffusion coefficient increases exponentially with increasing temperature of the liquid, and the concentration gradient at the surface of the dissolved substance maximum when the liquid moves relative to the surface.

A device for feeding inhibitor (patent RF №2165009, 1999), which is a cylindrical container with a radial channels in the upper part of the side surface. Porous solid inhibitor below the radial channels. The dissolution inhibitor reservoir fluid is in contact with the reservoir fluid into the porous structure of the inhibitor inside the container. From the surface of the inhibitor to the level of the radial channel inhibitor is taken as a result of its dissolution in the wellbore fluid further outside of the container, formed inside the channels of the formation fluid flow.

The disadvantage of this design is products is a rapid decrease in the feed rate of the inhibitor into the well in the lower dissolution rate inhibitor in the reservoir fluid inside the container due to the deposition in the pores of the inhibitor of solid particles, always present in the produced fluid.

Closest to the proposed device is a device for feeding inhibitor, which is a cylindrical body with radial channels, washed downhole fluid inside the solid inhibitor that occupies a cylindrical volume of smaller diameter (patent RF №2227206, EV 37/06, 2004). This design provides greater surface contact with the well fluid and the inhibitor throughout the length of the container, and continuous removal of dissolved inhibitor of the device.

However, both these processes accelerate the dissolution inhibitor and making it impossible for the continued operation of the device, especially in high-temperature wells.

The task of the claimed invention is a method of filing of the scale inhibitor in thermoplastic matrix and the structure of the device for its implementation, which would ensure long-term smooth flow inhibitor in the produced fluid.

The goal of the project is achieved in that in the method of supplying inhibitor in a thermoplastic matrix to the input submersible installations for the production of reservoir fluids, including preparation containing inhibitor hydrophobic thermoplastic mixture, placing it in the cylindrical housing with the holes on the ends, the descent of the casing in which quainoo, heating of the mixture to ambient temperature, the dissolution of the mixture with the inhibitor, unlike the prototype, after heating, the mixture is removed from the body through the dosing hole under the influence of the earth's gravitational field, the dissolution of the mixture is performed in a special chamber by diffusion with subsequent transport of dissolved inhibitor in the produced fluid. To ensure the possibility of leakage from the housing under the force of gravity of thermoplastic mixture is prepared with a density greater than the density of the reservoir fluid. In the working chamber, established under the cylindrical body, for a stable uniform and efficient removal of solid inhibitor creates a vortex within the reservoir fluid received from the stream, washing the cylindrical body.

In the part of the device, the problem is solved in that the device for feeding inhibitor in a thermoplastic matrix to the input submersible installations for the production of reservoir fluids containing cylindrical body having in the upper part of the radial canals, and placed in the cylindrical housing below channel inhibitor differs from the prototype in that the cylindrical body at the bottom is blocked by a plate, which additionally mounted in the working chamber in the form of a Cup with a solid bottom and perforations on the side panels, with the bottom of Jindrisska of the case is made, at least one metering orifice providing flow inhibitor under the action of gravity into the working chamber at a given speed. For smooth flow control perforation on the side walls of the working chamber is made at an acute angle to the bottom of the glass. Possible that the direction of the perforation on the side walls of the working chamber is oriented parallel to the Cup base. In addition, the perforations can be additionally covered by a grid, which will greatly reduce the intensity of the eddy currents in the chamber. To ensure a smooth flow device reservoir fluid, it is advisable to perform the cylindrical body and the working chamber with the same outer diameter.

The essence of the method consists in the following.

The inhibitor is mixed with a viscous matrix material and placed inside a cylindrical container shell, which hung in the dip facility below the motor. When this contact inhibitor that is in the tank, with the reservoir fluid is limited by the area of the metering orifice in the lower part of the body. In the upper part of the body above the inhibitor accumulates coming through the radial channels water, preventing the dissolution of thermoplastic mixture. The density of the resulting mixture, containing inhibit the R, must not exceed the density of the reservoir fluid. The well is heated mixture due to the increased ambient temperature. The mixture acquires the fluidity and under the action of gravity flows out of the body below the working chamber. The rate of leakage is determined by the rheological properties of the mixture, the difference between the densities of the mixture and the reservoir fluid and the size of the holes in the lower part of the body. Removal of the inhibitor from the working chamber is carried out by diffusion and vortex flow inside the chamber, which is created by an external flow of the well fluid surrounding the container. The limiting link speed of removal of the inhibitor used in this method is the rate of dissolution in the plane of the metering holes in the bottom of the hull.

For the implementation of the proposed method the proposed design of the device, the scheme of which is shown in the drawing.

The device comprises a cylindrical housing 1 in which is placed an inhibitor 2 in a thermoplastic matrix. In the upper part of the side surface of the housing 1 has one or more radial ducts 3 connecting the internal volume capacity of your device with the annular space. Ventilation ducts 3 are used to equalize the pressure inside the tank and in the annulus when the flow of the mixture from the tank. the bottom of the housing 1 is blocked by a bottom 4 with metering holes 5. The plate 4 attached to the working chamber 6, which serves to dissolve the mixture and removal of the inhibitor in the annulus.

The working chamber 6 has a cylindrical shape, perforated side surface and a solid bottom. The size and number of metering holes 5 connecting the container body 1 with the working chamber 6, determine the time flow of the mixture from the housing. The side cylindrical surface of the working chamber 6 coincides with the outer surface of the housing 1. The number, diameter and direction of the openings 7 in the side surface of the working chamber 6 are selected to provide the desired removal of the inhibitor solution from the working chamber 6.

The feeder inhibitor works as follows. Accommodated in the housing 1 mixture of the matrix substance and the inhibitor under the action of gravity flows through metering holes 5 into the working chamber 6. In the working chamber 6, the mixture of the matrix substance and the inhibitor is dissolved in the reservoir fluid. The supply of the solution of the inhibitor from the working chamber 6 through the holes 7 in the annulus is accomplished by the diffusion mechanism and the vortex flow inside the chamber 6, which is created by an external flow of well fluid around the body.

The geometric dimensions of the metering holes 5 and the ventilation holes 3 of the device for operation in a specific SLE is jinah were selected during simulation workflow container-dispenser. The selection is confirmed by bench tests.

1. The method of delivery of the inhibitor to the input submersible installations for the production of reservoir fluids, including placement of the inhibitor in the cylindrical housing with the channels in the upper part of the body, lowering the casing into the borehole, a dissolution inhibitor, its excretion from the body, characterized in that the inhibitor is mixed with a viscous matrix substance with the formation of the hydrophobic thermoplastic mixture whose density exceeds the density of the reservoir fluid, after lowering the casing into the borehole heat the mixture to ambient temperature, and after heating the mixture removed from the body through the dosing hole under the influence of the earth's gravitational field, the dissolution of the mixture is performed in the working chamber by diffusion with subsequent transfer dissolved inhibitor in the produced fluid, while the working chamber installed below the cylindrical body, and create within it a swirling motion of the reservoir fluid.

2. The feeder inhibitor input submersible installations for the production of reservoir fluids containing cylindrical body having in the upper part of the radial canals, and placed in the cylindrical housing below channel inhibitor, characterized in that the cylindrical body at the bottom is blocked by the bottom, under which is placed the work is the first camera in the form of a Cup with a solid bottom and perforations on the side panels, in the bottom of the cylindrical body has at least one metering orifice providing flow inhibitor under the action of gravity into the working chamber at a given speed, and the inhibitor is distributed in thermoplastic matrix.

3. The device according to claim 4, characterized in that the perforation on the side walls of the working chamber is made at an acute angle to the bottom of the Cup and additionally closed mesh.

4. The device according to claim 4, characterized in that the direction of the perforation on the side walls of the working chamber is oriented parallel to the Cup base.

5. The device according to claim 4, characterized in that the cylindrical housing and the working chamber is made of the same outer diameter.



 

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