System and method to restore well productivity and oil pumping means, including after killing

 

The invention relates to the oil industry and can be used for continuous recovery of reservoir properties bottomhole producing wells, including after the killing, and subsequent oil pumping means. The system includes lowered into the well tubing (tubing), the standard Delta valve with discharge line. Ground-based equipment to create a managed depression contains the pumping unit, the installation of the discharge gas, a device for producing a finely dispersed gas-liquid mixture and channel capacity. Tubing down deep pump function of the downhole device to obtain a finely dispersed gas-liquid mixture in the process. Mouth armature is arranged to provide switching of the well by means of latches to work into the reservoir through the line strapping flow line with continuous refill of fluid in the gutter capacity, as well as disable and dismantle the ground equipment when you achieve the desired intensity of the flow. According to the method of driving the liquid circulation in the borehole through the annulus and tubing supply pumping unit in the annulus of the borehole. the Noah gas-liquid mixture. At the time of gas in the fluid flow includes submersible pump, and liquid circulation perform advanced through the working pump. Reduce the value of the bottomhole pressure the influence of fine-dispersed gas-liquid mixture. On the surface made the kill fluid and production wells in the gutter capacity. Manipulating the valves, wellhead equipment and switch well to work into the reservoir through the piping flow line. Provides an introduction wells in operation in the recovery process productivity without additional damping. 2 AD. and 1 C.p. f-crystals, 1 Il.

The invention relates to the oil industry and can be used for continuous recovery of reservoir properties bottomhole producing wells, including after the killing, and subsequent oil pump method.

There is a method /1/ intended for oil wells which consists in the fact that the tubing (tubing) pumped the gas mixture with a liquid (usually water or oil). For these purposes, the necessary mobile compressor and pump unit that generates at least the same pressure as the compressor capacity on the through tubing annulus, through which is ejected on the surface. The reservoir created by the depression, the liquid in the reservoir rangiruatia, the reservoir is emptied.

The disadvantage of this method is that as you increase the depth to which it is necessary to inject the mixture, it is necessary to increase the outlet pressure of the compressor and the pump, otherwise the mixture will not go to the lower end of the bore tubing. So, for a depth of 2000 m, filled with water, the compressor should give a pressure not lower than 20 MPa (200 kgf/cm2). It is technically difficult, energy intensive and dangerous. In addition, when the process is stationary, the effect of depression on the formation stabilized and those particles that are stuck or formed tubes in the channels of the formation, the cement sheath or in the perforation holes of the casing, will not be removed. When direct (gas-liquid mixture is fed into the tubing) circulation of the gas-liquid mixture, the velocity of the flowing stream in the annular space much smaller than the velocity of the fluid in the tubing, which greatly impairs the removal of the clogging material to the surface.

Way /2/ includes cyclic injection compressor air pockets in the tubing is, reviewsin pressure compressor, and the subsequent reduction of pressure in the bottomhole formation zone.

The reduction of pressure in the bottomhole formation zone is carried out by pushing air pockets from the column tubing annulus, and cyclic injection compressor air pockets in the column tubing is repeated until the termination of the removal of cuttings from the annulus to the surface.

The disadvantage of this method is that when pushing the air tubes to the bottom of the borehole is called pretty strong repression on the bottomhole formation zone, which may contribute to hardening of clogging material in the perforation channels and porous media, due to the differential pressure arising that in the future materially impede its removal to the surface.

Other otricatelniy factor affecting the efficiency of the process is the ability to merge air pockets in the cavity of the tubing due to the contact of the liquid phase to the surface of the pipe and slip air pockets under the force of Archimedes.

Besides worsening conditions of removal of the clogging material, because the working agent is pumped in Sktsti flow is significantly less than the flow rate in the tubing.

Closest to the proposed technical solutions are equipment system and method of restoring the productivity of the well, including after the killing, according to the patent /3/ that provide managed long depression in the bottomhole formation zone (PPP).

System hardware the prototype includes tubing, special estuarine valve, pump unit, installation of gas injection, wellhead device for producing a finely dispersed gas-liquid mixture, channel capacity, and damper (antifoam) and downhole disperser to obtain a finely dispersed gas-liquid mixture. Special mouth valve is installed and used by the brigade major repair of wells (red) for geological and technical measures (GEA).

The way to restore well productivity, including after the killing, the prototype includes the initiation of fluid circulation in the well through the annulus and tubing supply pumping unit in the annulus of the well, the gas in the liquid stream by setting the discharge gas through wellhead & downhole device to obtain a finely dispersed gas-liquid mixture, reducing the value of downhole dawli killing and production wells (clogging material and oil) through the tubing. Perform a gradual increase in the gas content in a finely dispersed gas-liquid mixture.

The disadvantages of the known system and method is primarily that after cleaning the PPP and stimulation of production wells to start last in the work necessary to extract deep dispersant and tubing and accordingly descent of the downhole pump and tubing, re-killing the well, which is undesirable, but inevitable.

Solved the problem and the expected technical result consists in creation of such systems and equipment such way to restore well productivity, including after killing that without additional damping and lifting of missions would enter the well into operation practically in the recovery process productivity. Working pump helps to increase and maintain the required values of depression.

The problem is solved in that the proposed system restore well productivity, including after the killing, including lowered into the well tubing (tubing), estuarine valve with discharge line, ground equipment to create managed depressions in the form of no and gutter capacity, excites the circulation of the fluid in the borehole through the annulus, tubing and channel capacity and the gas in the liquid stream includes the additional lowered on a tubing pump with the function of the downhole device to obtain a finely dispersed gas-liquid mixture in the process, and the collector, the mouth valves made standard with the possibility of switching wells using valves to work into the reservoir through the line strapping flow line of wellhead equipment with continuous refill of fluid in the gutter capacity, as well as disable and dismantle the surface equipment to create a managed depression when you achieve the desired intensity of the influx.

As the downhole pump set centrifugal pump or sucker rod pump.

The problem is solved also by the fact that in the proposed method, recovery well productivity and oil pumping means, including after the killing, including the initiation of fluid circulation in the well through the annulus and tubing supply pumping unit in the annulus of the well, the gas in the liquid stream by setting nologo pressure the influence of fine-dispersed gas-liquid mixture and removing the liquid surface plugging and production wells in the gutter capacity, at the time of gas in the fluid flow include a subsurface pump and a circulation of liquid in the borehole perform advanced through the working depth of the pump and after removal of the liquid surface plugging and production wells in the gutter capacity, by manipulating the valves standard wellhead equipment, switch hole to work into the reservoir through the piping flow line standard wellhead equipment with header.

The drawing shows the inventive system, where:

1 - tubing,

2 - standard mouth armature,

3 - pump unit,

4 - installation of gas injection,

5 - a device for producing a finely dispersed gas-liquid mixture,

6 - channel capacity,

7 - submersible pump,

8 - harness flowlines standard wellhead equipment with header,

9 - valve standard wellhead equipment,

10 - annulus.

The proposed system works as follows, carrying out a sequence of operations by the present method.

1. After the descent of the downhole pump 7 for the tubing 1 on a planned depth of tie standard estuarine valve according to the drawing.

2. By incorporating in the work of the pump unit 3 excite the circulation of liquid in the well through the annular space of the C in the fluid flow through installation of gas injection 4 through the device to obtain a finely dispersed gas-liquid mixture 5.

4. Simultaneously with the supply of gas under item 3 include the work of submersible pump 7.

5. By reducing the value of the bottomhole pressure by exposure to fine, the gas-liquid mixture and the operation of the downhole pump 7 is provided removal on the surface of the kill fluid and production wells in the gutter capacity 6. After appearing in gutter capacity 6 oil switch well with valves 9 standard wellhead equipment to work into the reservoir through the line strapping 8 flowlines standard wellhead valve 2 with the reservoir. While continuously refilling of fluid in the gutter capacity 6.

6. After a fixed interval of time (e.g. 30 min) for visual inspection of the intensity of the inflow of short-term by means of latches 9 standard wellhead valve switches the flow of fluid from production wells in the gutter capacity 6. When you achieve the desired intensity of the inflow of ground equipment 3, 4, 5, 6 to create a managed depression off and disassemble, as well leave to work in the header.

The claimed system and method to restore well productivity, according to the authors, meet the criteria of “novelty” and “inventive step”, so kamateros material and fluid damping and alignment of the restoration process, mining process, without additional time and material costs on tripping, lifting operations, to guarantee the absence of open emissions.

In the inventive combination of features working pump performs not only the function of the lift well production to the surface, and is the guarantor of the stability of the recovery process productivity method managed long depression, and partly assumes the functions of the downhole device to obtain a finely dispersed gas-liquid mixture.

An example of a specific implementation of the

After killing the production well and the replacement of the downhole pump (ESP) was carried out testing the new pump on the flow of the well fluid. The measurements showed that the flow rate of oil wells has decreased relative to the plan and is 24 m3/day at the dynamic level, 765 m and the depth of the descent of the pump 1025 m

It was decided to carry out works to restore well productivity approach.

During processing of the proposed method with the use of the proposed system equipment well changed its flow in the following sequence:

after 1 hour treatment - oil output was 28 m3/day,

zvyseniu planned production rate of 10 m3/day.

Work on restoring the productivity of the wells were terminated and the well is left in operation.

The measurements carried out after 7 days, gave the following result: the oil output was 48 m3/day at the dynamic level, 315 m, which corresponds to the plan.

Work on our proposed method more efficient than the prototype, as along with the clogging material from the PPP is most fully extracted kill fluid, and operation of wells begins in the process of the restore well productivity; the process does not require expensive special downhole devices and allows you to exclude participation in the process brigades cattle.

Sources of information

1. Shurov Century. And. Technology and engineering of oil. M.: Nedra. 1983, S. 117.

2. RF patent №2085720, E 21 IN 43/25, BI No. 35, 1997

3. RF patent №2197609, E 21 IN 43/25, BI No. 3, 2003

Claims

1. System restore well productivity, including after the killing, including lowered into the well pump kompressornye pipe (tubing), estuarine valve with discharge line, ground equipment to create managed depressions in the form of a pumping unit, a setup discharge gas, ostacoli fluid in the borehole through the annulus, Tubing and channel capacity and the gas in the fluid flow, characterized in that it contains additionally lowered on a tubing pump with the function of the downhole device to obtain a finely dispersed gas-liquid mixture in the process, and the collector, the mouth valves made standard with the possibility of switching wells using valves to work into the reservoir through the line strapping flow line of wellhead equipment with continuous refill of fluid in the gutter capacity, as well as disable and dismantle the surface equipment to create a managed depression when you achieve the desired intensity of the influx.

2. The system under item 1, characterized in that the downhole pump set centrifugal pump or sucker rod pump.

3. The way to restore well productivity, including after the killing, including the initiation of fluid circulation in the well through the annulus and tubing supply pumping unit in the annulus of the well, the gas in the liquid stream by setting the discharge of gas through the device to obtain a finely dispersed gas-liquid mixture, lowering the value of downhole Dawley wells in the gutter capacity, characterized in that at the time of gas in the fluid flow include a subsurface pump and a circulation of liquid in the borehole perform advanced through the working depth of the pump and after removal of the liquid surface plugging and production wells in the gutter capacity, by manipulating the valves standard wellhead equipment, switch hole to work into the reservoir through the piping flow line standard wellhead valve with the reservoir.

 

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-d22
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3 cl, 2 dwg, 2 ex, 1 tbl

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FIELD: mining industry.

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