RU2527085C1 - Procedure for treatment of bottomhole zone of producer - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: procedure for treatment of bottomhole zone of a producer includes filling in of the productive stratum interval with a solution for asphalt, resin and paraffin depositions with partial flushing to the well bottomhole. Vacuum and pulse simulation is carried out with simultaneous extraction of the reaction products. The interval of the productive stratum is filled in with hydrochloric acid solution, which is flushed partially to the well bottomhole. The process is withheld and vacuum and pulse simulation is carried out with simultaneous extraction of the reaction products. At that in one cycle of vacuum and pulse simulation about 0.01 m³ of liquid is pumped out. During vacuum and pulse simulation upon flushing of the solution for asphalt, resin and paraffin depositions quantity of pulses is increased 3-6 times more than upon flushing with hydrochloric acid solution, moreover volume of the reacted solution to be extracted is equal to the volume of the injected solution for asphalt, resin and paraffin depositions.

EFFECT: improving treatment efficiency of a bore-hole zone.

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Description

The invention relates to the oil industry and can be used in the treatment of the bottom-hole zone of a producing well.

A known method of processing the bottom-hole zone of a well in which a horizontal wellbore is filled with a solvent of asphalt-resinous and paraffin-hydrated deposits. Carry out technological exposure and remove the solvent from the well. Allocate in a horizontal wellbore of an interval of processing on 30-50 m everyone. The depth of the middle of each processing interval is determined and the order of processing from the upper processing interval to the lower is assigned. The horizontal wellbore is filled with an acid solution and conducting technological exposure. The source of the pulse-depression effect is placed alternately in the middle of each treatment interval and the pulse-depression effect is performed with the selection of the well fluid in each treatment interval (RF Patent No. 2117151, CL A21B 43/27, publ. 08/10/1998).

Closest to the proposed invention in technical essence is a method of processing the bottom-hole zone of a producing well, according to which the well is washed with a solvent of asphalt-resinous and paraffin-hydrated deposits with its partial filling into the bottom-hole zone of the well. Then a vacuum-pulse action is carried out with simultaneous pumping of the reaction products. Fill the interval of the productive formation of the well with a solution for treating the bottom-hole zone of the well and push it with oil into the bottom-hole zone of the well. Carry out technological exposure. A vacuum-pulse action is carried out with the simultaneous pumping of reaction products. Repeat the operation. When repeating operations after each filling of the interval of the productive formation of the well with a solution for treating the bottom-hole zone of the well, it is pressed with oil into the bottom-hole zone of the well. When filling the interval of a productive formation of a well with a subsequent portion of a solution for treating a bottom-hole zone of a well, its volume is increased by 1.15-1.25 in comparison with the volume of the previous portion of a solution for treating a bottom-hole zone of a well (RF Patent No. 2111745, class E21B 43/25, publ. 08/10/1998 - prototype).

A disadvantage of the known methods is the lack of processing efficiency, and with an increase in the intensity of the impact, there are phenomena of sand manifestation, increased load on the rocking machine, in some cases leading to stretching and breaking of the rods.

The proposed invention solves the problem of increasing the processing efficiency while eliminating increased loads.

The problem is solved in that in a method for treating a bottom-hole zone of a producing well, including filling an interval of a productive formation of a well with a solvent of asphalt-resinous and paraffin-hydrate deposits, partially filling it into the bottom-hole zone of a well, vacuum-pulse action with simultaneous pumping of reaction products, filling the interval of a productive formation with hydrochloric acid with its partial crushing into the bottomhole zone of the well, technological exposure and vacuum-pulse impact with simultaneously evacuating the reaction products according to the invention for one cycle of vacuum-evacuated depression effects order of 0.01 m ³ of liquid under vacuum following a pulsed exposure zadavki solvent asphaltene sediments and parafinogidratnyh number of pulses administered 3-6 times greater than when the vacuum impulse action after the hydrochloric acid solution is crushed, when the volume of extraction of the reacted volume of the solvent of asphalt-resinous and paraffin hydrate deposits is assigned, equal to the volume of the injected solvent .

SUMMARY OF THE INVENTION

Bottom-hole cleaning using a vacuum-pulse effect is effective when a certain amount of exposure is achieved. However, this value may turn out to be so large that side undesirable effects will begin to appear, such as sand, breakage, increased wear of equipment, increased energy consumption, etc. Existing methods do not affect this side of the impact, paying attention only to the processing efficiency, expressed in increasing the flow rate of wells or in increasing the injectivity of wells. The proposed invention solves the problem of increasing the processing efficiency while eliminating increased loads. The problem is solved as follows.

When processing the bottom-hole zone of a producing well, the interval of the productive formation of the well is filled with a solvent of asphalt-resinous and paraffin-hydrated deposits with its partial filling into the bottom-hole zone of the well, a vacuum-pulse action is performed with simultaneous pumping of reaction products, filling the interval of the productive formation with a solution of hydrochloric acid with its partial filling into the bottom-hole wells, technological exposure and vacuum-pulse impact with simultaneous pumping of reaction products. For one cycle of vacuum-depressive exposure, about 0.01 m ^{3 of} liquid is pumped out. In the case of vacuum-pulsed exposure after the solvent is crushed with asphalt-resinous and paraffin-hydrated deposits, the number of pulses is prescribed 3-6 times more than in the case of vacuum-pulsed exposure after the solvent is crushed with hydrochloric acid, when the volume of extraction of the reacted volume of the solvent of asphalt-resinous and paraffin-hydrated deposits equal to the volume is assigned .

This mode of vacuum-depressive exposure allows you to avoid sand, breakage rods, increased wear of equipment, increased energy consumption while maintaining the effectiveness of the impact. Assignment of the recovery volume of the reacted solvent volume of asphalt-tar and paraffin hydrate deposits equal to the volume of injected solvent ensures complete removal of asphalt and tar and paraffin hydrate deposits from the near-wellbore zone. A smaller volume leads to incomplete extraction, and a larger one leads to an unjustified consumption of electricity. The appointment of pulsed asphalt-resinous and paraffin-hydrated deposits during vacuum-pulsed exposure after solvent injection is 3-6 times greater than during vacuum-pulsed exposure after injection of hydrochloric acid solution, it is necessary to reduce the load on the collector in the near-wellbore zone, to eliminate sand formation and to reduce loads on the rocking machine and rods to exclude increased loads and energy consumption. The collector, subject to the influence of a solvent of asphalt-resinous and paraffin hydrate deposits, retains its strength and is not susceptible to destruction by vacuum-pulse exposure. Therefore, such a reservoir can be loaded by the impact without fear of its destruction and the occurrence of sand removal into the well, i.e. sand occurrences. The collector, exposed to the hydrochloric acid solution, is partially destroyed by acid. An additional vacuum-pulse action contributes to the additional destruction of the collector and the appearance of sand during intense exposure. In accordance with this, we proposed to reduce the intensity of the vacuum-pulse effect after filling in the near-wellbore zone of the hydrochloric acid solution by 3-6 times. The proposed regime is successfully implemented if about 0.01 m ^{3 of} liquid is pumped out in one cycle of the vacuum-depressive effect. Such a gentle mode of exposure allows you to fulfill the above conditions. The pumped-out volume of 0.01 m ^{3 of} liquid is regulated by the installation of equipment for vacuum-depression. The volume of 0.01 m ³ can vary within ± 10%.

Concrete example

Example 1. In a well, geophysical surveys are conducted along an open-hole horizontal well to identify oil saturation of the sites, and cavernometry of these sites is carried out to select the diameter of the TAM-J inflatable packers tm. Paired inflatable packers “TAM-J” tm and a device for conducting vacuum-depressive treatment of a site are assembled on a tubing string. The distance between the inflatable packers is not more than 50 meters. The layout is lowered to the treated area on the tubing string and the twin inflatable packers are installed. The plunger assembly of the estimated length is assembled and lowered on the rods to a depth above 40 meters from the device for the vacuum-depressive effect. Solvent of asphalt-resinous and paraffin-hydrate deposits is pumped - distillate is pumped through the tubing string and the device for vacuum-depressive action into the interpacker space with a volume equal to 120% of the volume between the inflatable packers. Spend the sale of oil with a closed annular valve through the tubing string with a volume equal to the volume of the tubing string. The plunger arrangement is lowered into the device for the vacuum-depressive effect, the plunger stroke is adjusted. The interpacker section of the horizontal trunk is processed by lifting up and lowering the column of rods with the plunger arrangement 450 times using a lifting unit. Raise the plunger arrangement by 40 meters, pump a 24% solution of hydrochloric acid with a volume of 130% of the volume of the interpacker space. Spend the sale of oil with a closed annular valve with a volume equal to the volume of the tubing string. The plunger arrangement is lowered into the device for the vacuum-depressive effect, the plunger stroke is adjusted. The interpacker section of the horizontal trunk is processed by lifting up and lowering the rod string with the plunger assembly 150 times using a lifting unit.

In a vacuum-depressive action, about 0.01 m ^{3 of} liquid is pumped out for one cycle of a vacuum-depressive effect.

At the end of the treatment, the plunger assembly is lifted, the packers are blown off, the tubing strings with the TAM-J packers tm are lifted. Based on the results of the well study, the downhole pumping equipment, parameters are selected for inflow, the equipment is lowered into the well and put into operation.

Example 2. Perform, as example 1. As a solvent for tar and paraffin deposits using a wide fraction of light hydrocarbons. Processing interspackage section of the horizontal trunk after injection of the solvent is performed 900 times. As a solution of hydrochloric acid using a 12% solution.

Example 3. Perform, as example 1. As a solvent for tar and paraffin deposits use diesel fuel. Processing interspackage section of the horizontal trunk after injection of the solvent is performed 600 times. As a solution of hydrochloric acid using a 15% solution.

As a result of processing, the well production rate reached the design one and amounted to 10 tons of oil per day. There is no sand occurrence in the well. The rocking machine operates in the normal mode of the bases of the breakage of the rods and increased wear of parts.

The application of the proposed method will solve the problem of increasing the efficiency of processing while eliminating increased loads.

Claims (1)

A method of treating a bottom-hole zone of a producing well, comprising filling an interval of a productive formation of a well with a solvent of asphalt-resinous and paraffin-hydrated deposits with a partial crushing of it into the bottom-hole zone of a well, vacuum-pulse exposure with simultaneous pumping of reaction products, filling the interval of a producing formation with a solution of hydrochloric acid with partially filling it with a prize well zone, technological exposure and pulsed vacuum with simultaneous pumping of reaction products and, characterized in that about 0.01 m ^{3 of} liquid is pumped out in one cycle of the vacuum-depressive effect, during the vacuum-pulsed exposure after the solvent is crushed, asphalt-resinous and paraffin-hydrated deposits, the number of pulses is prescribed 3-6 times more than during the vacuum-pulsed exposure after filling in the hydrochloric acid solution, when assigning the recovery volume of the reacted solvent volume of asphalt-resinous and paraffin-hydrate deposits equal to the volume of the injected solvent.