The method of processing bottom-hole zones of oil reservoir

 

(57) Abstract:

The invention relates to the oil industry, in particular to methods of well stimulation using multiple implosionmichael effects on the bottomhole zone of the reservoir (PPP). Down in the hole implosion device, have it processed in the interval of the reservoir, pumped into the bottom zone of the processing composition and spend processing bottom-hole formation zone by creating multiple implosion-impact with simultaneous cleaning of the reaction products. Before being pumped into the bottom zone of the processing composition determine the intervals drained and compacted zones of the reservoir. Drained areas are filled viscoelastic, inert to the processing composition, material. Implosion device set against the compacted zone and subjecting it shock implosion effect. The injection of the processing composition is carried out in the process of shock-implosion effect. The method is used as in the new, completed the drilling of wells and old with a long lifetime. In the new wells way allows us to be freed from climatedepot.com and repair work. Increases the productivity of the wells due to the intensification of oil production implosion-impact on the PPP with regard to reservoir properties of the formation. It reduces the consumption of the processing composition. table 1.

The invention relates to the oil industry, in particular to increase productivity and intensification of oil production due to processing bottom-hole zone (OPZ) productive formation implosion-shock impact taking into account the geological structure of this layer.

The known method OPZ, including the impact on the bottomhole zone of multiple depression and repression through lowered to the bottom on the column tubing jet pump [see the book of Eremicus R. S. and other Technologies increase the productivity of wells using an inkjet apparatus. M: VNIIEM, 1992, S. 12, 13]. The method allows you to clear the bottomhole formation zone from contamination. The disadvantage of this method is the limited application because the majority of productive layers have considerable heterogeneity in permeability, where depression-repressione impact does not give positive results.

There is also known a method OPZ reservoir and production of oil, including divided the technological exposure, rinse the area cultivated interlayer, creating a vacuum in the area of cultivated land by pumping fluid into the area above resoondent and the annular space to the mouth of the well, the pressure recovery in the area of processed interlayer crossflow of fluid from the zone above the separation zone of the treated formation, repeating the operations until the flow of oil into the well and oil production from the zone processed through the interlayer zone above resoondent in the annular space of the well, while before restoring the pressure in the well advanced upload solution for bottomhole zone treatment to the extent that the filling area above resoondent well, and rinse the area treated seams combine with oil [see U.S. Pat. RU # 2029078, E 21 IN 43/25 from 24.03.93,, publ. BI No. 5 from 20.02.95,].

The method allows to combine depression-repressive effects with layer processing.

The disadvantage of this method is the low efficiency of the SCR, since the processing solution under the influence of depression-repressional impact is absorbed by the highly permeable regions of the formation, and low-permeability areas, which are poorly moves the nave to the present invention is the processing Method of the bottomhole zone of the production well (see RF patent №2117145, E 21 In 43/2 from 10.08.98,, publ. BI No. 22 of 10.08.98,) by which the vacuum pulse (implosion) exposure to produce simultaneous cyclic injection of the treatment solution, with each portion of the solution pushes the oil through the annular space into the reservoir, and each subsequent portion of the processing composition to increase to 1.15-1.25 compared to the scope of the preceding batch processing composition. The known method is implemented in the mode of repression, i.e., when the bottomhole pressure (PZab) is greater than the formation pressure (PPL.), therefore, the processing composition comes from the well into the formation. Effective SCR short-term due to re-contamination of the porous medium of the bottomhole zone after putting the well into operation, because only in the formation of the bridging agents will return to the bottom-hole zone from flowing from the reservoir oil and reduce its influx into the wellbore.

The processing method of the bottomhole zone of the oil reservoir includes a descent into the well implosion device, its location in the interval of the processed layer, pre-injection processing composition, the subsequent displacement with him into the reservoir and cleaning out the bottom zone Eductively layer of a special device, which increases the speed of formation fluid from the formation into the wellbore, which facilitates cleaning the bottom zone of contamination. Implosion is accompanied by a surge that leads to the formation of microcracks in the material layer.

However, the processing efficiency of the reservoir is reduced due to the fact that the process of cleaning the bottom zone of paraffin, resins, salts, clay particles, solids, silt deposits and other contaminants takes place purely mechanically by moving formation fluid from the formation into the well. A large part of the contamination remains on the walls of the pore channels, mainly adsorbed particles, hydrophilic wall layers that cannot be submitted reservoir fluid even after repeated depression and hydraulic impacts due to the effect of implosion. The result is not achieved the potential efficacy of treatment either due to water hammer or due to depression. In addition, cleaning of the bottom-hole formation zone due to the effect implosion in state repression ineffective, because under these conditions in emotionnal the camera comes wireline fluid and well fluid from the annulus, and h is the water hammer.

The technical objective of the proposed method of processing bottom-hole formation zone is to increase the productivity of the wells due to the intensification of oil production implosion-impact on bottom-hole formation zone taking into account the reservoir properties of the formation.

The problem is solved by the described method OPZ oil reservoir, including the descent into the well implosion device, its location in the interval of the processed layer, the injection into the bottom zone of the processing composition and the treatment of bottom-hole formation zone by creating multiple implosion-impact with simultaneous purification of reaction products.

What's new is that before being pumped into the bottom zone of the processing composition initially determine the intervals drained (high permeability) and tight (low-permeability zones of the reservoir, then drained areas filled viscoelastic, inert to the processing composition, material, and implosive device set against the compacted zone and subjecting it shock implosion effect, with the injection of a processing composition for SCR is carried out in the process (combine YuKU borehole bottom aqueous solution ML-80. Then use the depth meter off the injectivity profile of a layer in the perforation interval, which determines drained and compacted zone. Depending on the degree of pickup drained areas choose the viscosity and volume of the viscoelastic blocking composition. The column tubing (tubing) this composition is pumped into the well and forced into the drained area of the reservoir. As such, they can be used highly concentrated invert emulsion oil-based. After that, well, in the reinforced zone of the reservoir, the tubing string lower shock implosion device of multiple actions, and in the annular space between the production column and the column tubing) fetch and push in the area of the layer of processing composition. Shock implosion device is actuated. Simultaneously in the annular space in the zone of the reservoir constantly podavlyaetsya processing composition. In the contaminated portion of the processing composition are brought into the tubing string, and interact with the stratum fresh portions of the composition. The intensity processing significantly higher than in the prototype, because the processing composition is Test method conducted at well # 26105 Deposit 1 Elkhovskoye square (5 months ago was processing was carried out on the prototype). During flushing of the face determined injectivity of the reservoir, which amounted to 185 m3/day at a pressure at the mouth of 4.0 MPa. Then in the well was lowered deep flow meter and removed the injectivity profile of the productive formation. In the result, it was found that 5.5 m productive thickness of the layer pickup has the upper zone of the layer thickness of 1.2 m, the rest of the productive series practically does not accept the injected fluid. Thereafter, the tubing string lowered into the well casing (cylinder) implosion-shock device, mounted in the lower zone of the reservoir, pumped into the tubing and pushed into the reservoir (in the drained area) 10 m3high viscosity (360 SP) invert emulsion, and in microbe pumped processing composition (a hydrocarbon solvent - nefras 120/200) and pushed it to the interval of the formation. Then into the hole on the rods, pulled the plunger and injected into the cylinder (housing) implosion-shock device. Set the plunger in its extreme lower position. Then slowly move the plunger in its extreme upper position, where the hammer. At the time of the surge, (observed wince rods, valves fittings) have stopped the rise of the plunger and stiu (reciprocating motion of the plunger; which was carried out for 6 hours. During this time, was made 720 double strokes of the plunger, i.e., 720 shock-wave effects in the bottomhole formation zone. During the whole time of implosion-impact on struby zone of the reservoir, pumped solvent - nefras, which, after interactions with the contaminated zone of the reservoir was pumped implosion-shock device in the tubing string. The solvent consumption was only 3 m3.

After this implosion-shock device is removed from the well, pulled the pump equipment and put a hole in the work. 7 days after the release of the well to the mode produced hydrodynamic studies and took the inflow profile. The results of stimulation are shown in table.

The table shows that the coefficient of performance increased from 0.025 to 0.35 t/day.ATM running the thickness of the layer increased from 1.2 to 5.5 m, the flow rate was increased twice, while there was no growth of water production. The change of the flow profile shows including the low permeability zones of the reservoir. All these parameters characterize those high is aging, and old with a long lifetime. In the new wells, the method allows to get rid of mudding, penetrated into the formation in well construction and old - from mudding, penetrated into the reservoir during operation and maintenance work.

In addition, the proposed method can significantly reduce the consumption of the processing composition due to slow supply it during stimulation.

The processing method of the bottomhole zone of the reservoir, including the descent into the well implosion device, its location in the interval of the processed layer, the injection into the bottom zone of the processing composition and the treatment of bottom-hole formation zone by creating multiple implosion-impact, characterized in that before the injection of the processing composition determine the intervals drained and compacted zones of the reservoir, drained zone filled viscoelastic, inert to the processing composition, material, implosion device set against the compacted zone, and the injection of the processing composition is carried out in the process of implosion-impact.

 

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