Production bed treatment method

FIELD: oil production, particularly to stimulate oil extraction under difficult field development conditions, particularly in the case of carbonate formation treatment.

SUBSTANCE: method involves forming new cracks and/or stimulating existent ones in production bed by serially well flushing and performing periodical depressive and repressive actions along with flushing thereof at circulation or outflow stages; isolating interval to be treated with packer; cyclic changing pressure with following injecting working liquid, for instance oil and/or at least one plug of chemical agent, for example of hydrochloric acid. All above operations are performed along with oscillating action of radiator installed in front of production bed interval to be treated.

EFFECT: increased intensity of production bed treatment and extended operational functionality.

23 cl, 2 ex

 

The invention relates to the oil industry and can be used for enhanced oil recovery and enhanced oil recovery in the complicated conditions of mining, in particular in the treatment of carbonate formations.

There are many ways reagent treatment of the productive strata involving the injection wells of different technological solutions prepared on the basis of organic and inorganic origin. To increase the permeability of the productive reservoir and expansion of pore filter channels by dissolving part of the mineral collector in commercial practice, are widely used injection of various acids (A.S. USSR No. 1677279, 1675545, 1309645, Pat. Of the Russian Federation No. 2055983, CL. E 21 In 43/27), acids with the addition of various inhibitors of the reaction and stabilizers (U.S. Pat. Of the Russian Federation No. 2173383, 2070963, 2004783, CL E 21 In 43/27).

For chemical treatment of wells is very important determine enough time of treatment of wells, based on the duration of the interaction process solutions from clogging formations. When there is insufficient time processing of borehole permeability of the treated area, as a rule, is not completely restored, which leads to incomplete recovery well performance. Excessive time processing is and may well adversely affect the structural elements of the well, what uneconomical, and, most importantly, can lead to the deterioration of the permeability of the treated area due to secondary formation of various kinds of rigid and semi-rigid connections.

Known pulse processing methods, combining mechanical, thermal and chemical effects (U.S. Pat. Of the Russian Federation No. 2191259, CL E 21 In 43/263, №2209960, 2191259, 2095561, 2091570, class. E 21 In 32/27, 1480412, CL E 21 In 43/24), allowing more intensively to destroy clogging elements, and enhance existing, and formed during the combustion of the powder charge of a crack in the bottom hole zone of the well. However, due to the creation of a single pressure pulse is impossible to get a crack large extent. To create cracks greater extent, you should either increase the time of exposure to excessive pressure, or to increase the pressure amplitude. But this can lead to the destruction of the casing and to the disruption of adhesion of the cement stone with the column.

There are also known methods of processing bottom-hole formation zone in which cracks are invited to descend into the well a variety of devices with a membrane, which is destroyed when it reaches a certain pressure (U.S. Pat. Of the Russian Federation No. 2065949, Pat. U.S. No. 4548252, CL E 21 In 43/263). The disadvantage of these methods is the low efficiency of cracking due to one-time stimulation and because Mal is th generated pressure.

Known methods of processing of the reservoir, including the creation of fractures in the reservoir and wave impact elastic vibrations (U.S. Pat. Of the Russian Federation No. 2085721, CL. E 21 In 43/25, Gadiev S.M. the Use of vibration in oil. M.: Nedra, 1977). The disadvantage of these known technical solutions is the low efficiency of transmission of elastic waves in the layer.

The closest technical solution is the method of processing oil wells in U.S. Pat. Of the Russian Federation No. 2168006, CL E 21 In 43/25, 43/00, according to which the reservoir is affected by vibrations from the transducer in the perforated interval of the well. Well equipped tubing (tubing) and tightly close the annulus with the perforation. Through tubing into the well through the perforations into the formation dissolving particles of the formation fluid. Here create a zone of high hydrostatic pressure, causing fluctuations in the liquid with their impact on the reservoir. Emitter mounted on the wellhead and mechanically connected with tubing. Afterwards rinse the wells from the products of reaction injected fluid with the material of the layer by washing away the products of reaction through the annulus.

Although the combination of high pressure of the injected fluid with its variations proposed in this way, increases the intensity and is therefore, its effectiveness stimulation, however, the disadvantages of this method are the small amplitude oscillations associated with the installation of the radiator at the wellhead and, accordingly, a significant attenuation of the waves in the tubing, thus injected into the formation reagent, mainly penetrates into the layers with higher permeability.

The objective of the invention is to increase the intensity of impact by creating an enabling environment for full coverage of the reservoir network deep nestykuyuschihsya cracks and effective fastening, and to increase the depth of the reagent impacts, and enhanced operational capabilities of the method.

This object is achieved in that in the known method of treatment of the reservoir, including vibrational effects in the productive interval of the formation from the emitter, the injection of chemicals and rinse well equipped with tubing and packer, according to the invention in the reservoir to create and develop new cracks and/or intensify existing by sequential leaching of the well working fluid, periodic depression-repressional exposure by flushing at the stage of circulation or spout, the isolation packer of the processed interval of the reservoir, the cyclic changes of pressure with subsequent injection of working W is dcosta, for example oil and/or at least one rim of the chemical, for example hydrochloric acid, while the above operation is performed when the oscillatory effects radiator mounted in front of cultivated productive interval of the formation.

The above distinguishing features of the proposed method are manifested in the emergence of a new mode of stimulation, which is characterized not only by increasing the number of generated cracks and depth of their education, but also the ability to control their formation and distribution throughout the layer.

According to the invention in the first stage, the influence of elastic oscillations in the near-wellbore area of the formation in combination with the flushing of the well working fluid, and then periodically produce depression-repressione impact with the increase of hydrostatic pressure above the reservoir and its subsequent reduction to spout (inflow) from the reservoir. However due to the proposed location of the hydrodynamic generator zone of maximum vibrational impact is localized in the middle of the interval of the formation. In this zone there is an intensive softening of mudding and their efficient extraction of the existing cracks and pore channels of the formation stages of the spout. Such cleaning and restoration of the natural permeability in the op is Tania's story with the stages increase and pressure relief in the field of elastic waves causes a significant weakening of the skeleton and structure of the reservoir rock and initiates the formation of a large number of embryos fracturing in Central the area of the reservoir interval. Due to the effect of elastic vibrations on neftegazonosnoi environment of the reservoir there is a substantial reduction of the effective viscosity of reservoir fluids, decreases the hysteresis of wetting, initiated and intensifying filtration processes in low-permeability channels and microcracks of the geological environment of formation. The result is the characteristic times of wetting and filtering of fluids through the newly formed system of microcracks become comparable with the time of exposure that defines a new quality - the formation of irreversible extensive system of new channels by filtering with changes in the permeability, hydroconductivity, piezoconductivity and sufficient local capacities near the well, and in exposed areas of the layer as a whole. When depression-repressional impact with elastic oscillations are superimposed for more rapidly varying intensities of elastic deformation of the compression-rarefaction that intensifies as the actual formation of microcracks on the surface of the channels and along the radius from them, and create cracks extended into the formation at high pressure gradients, and by reducing the pressure in the PPP facilitates the redistribution and reduction of residual elastic stresses and reduces spicemaster cracks, which increases the open area is x then, for filtering the fluid. In the second stage, after isolation of the processed interval of the formation packer cyclic pressure change, due to the broadening and deepening of the formed cracks, is the initiation and establishment of a network of new cracks. During the subsequent injection of the working fluid and/or chemicals into the reservoir, together with the influence of elastic fluctuations and by raising the pressure in the reservoir, it formed extensive and deep network of cracks. The processes of crack formation and rearrangement of matrix saturated hydrocarbon fluid environment of formation are inextricably linked with relatively short but intense process of degassing of the fluid of high pressure on the newly formed system void of microcracks, which is intermittent on the principle of resonance and synchronization in General determines the high energy and lavinoopasnost process response of the reservoir, causes the recharge energy discharge of the geological environment of formation. In this case the propagation of elastic waves through the formation of their amplitude will decrease slightly, and in certain circumstances even to grow.

Unlike known methods, the implementation of which cracks are formed from initially the weakest zone of the reservoir interval (most likely in the area of its roof or soles) and go in the surrounding reproductive who's breed, in the proposed method, the cracks initiate from pre-prepared by the Central zone of the reservoir interval and it provides the full width and depth of the formation development of cracks. Vibrational effects in the injection of chemicals leads to efficient filling both large and most narrow cracks, and provides the processing efficiency as the thickness of the reservoir and its extension.

In addition, since the creation of micro-cracks for the formation of new filtration fields in the layers you want a fairly complete wetting of the newly formed surface of the breed fluid, and the characteristic times of filtration processes in the known methods much larger than the characteristic times of the crack, after effects is the closure of the formed micro-cracks on the "dry" contacts and irreversible extensive fracturing does not occur. As a result, the impact it has significant positive influence on the filtration field formation in General.

In order to optimize the method and increase coverage of exposure appropriate for periodic depression-repressional impact in the reservoir additionally to upload at least one rim of the chemical, for example, the solution of surface-active substances, chemicals with acid or alkali is full-time reaction, hydrocarbon solvents or their compositions, and in carbonate reservoirs additionally inject hydrochloric acid or its solutions and/or nepakeltu emulsion. As the working fluid can be oil, water, solutions of surfactants and other chemicals.

Lowering the downhole pressure during periodic depression-repressional effects can be accomplished with the help of an injector.

If necessary, periodic depression-repressione effects you can create weight of a column of liquid such as infill wells gas-liquid foam or solution of calcium chloride.

To improve the processing performance of the processing for periodic depression-repressional the impact of washing on the stage of circulation or spout, it is advisable to increase the technological parameters of the working fluid, for example, pressure and/or flow, depending on the characteristics of the bottom-hole formation zone, such as pickup.

To assess the effectiveness of transactions with periodic depression-repressional effects can be hydrodynamic testing and its results to judge the time of transition to the isolation packer of the processed interval of the formation.

Cyclic change of pressure can make the period of the economic increase and decrease in bottomhole pressure, and, if necessary, in several stages, until fracturing, gradually increasing technological parameters of the working fluid, such as blood pressure and expenses, after fracturing can you upload the working fluid, for example hydrochloric acid, and in addition to selling its oil.

For fixing cracks from closing after fracturing in the well to pump fixing agent, such as a proppant.

To reduce the withdrawal of liquid from the cracks in the pores of the collector in one of the cycles increase the pressure in the reservoir, it is useful to inject the working fluid, for example an emulsion, the reagent solution with high viscosity, and in the case of strong absorption in the reservoir additionally upload isolating or blocking composition, such as an emulsion.

At low injectivity appropriate after isolation packer of the processed interval of the formation of cyclic variation of pressure to start downloading rims acid.

In the processing of carbonate reservoirs by injecting the rim of the chemical can be produced by alternating the injection rims acid and neftegassrtoi emulsion.

To increase the penetrating ability and reduce negative effects in the injected acid is useful to introduce functional additives such as surfactants, on the emulsifying, dispersant, anticaglia substances.

In tight reservoirs it is advisable to create and/or to initiate the initial process of crack formation, for example powder charge.

To optimize the vibrational effects can pre-define the parameters available in the productive formation of cracks, for example by the method of seismological side view of the wells, and their combination to determine the parameters of elastic waves and the working fluid.

As the emitter can be used hydrodynamic generators, such as pulse or with regular waves, or Electromechanical converters.

To intensify the cleaning of bottom-hole zone of the well after injection of at least one fringe of the chemical make removing the reaction products from the injector or pumping of foam.

When possible neftegazopromyslovyi appropriate instead of jamming the water treatment carbonate productive formation to complete the filling of the borehole reverse water-oil emulsion, cooking on the bottom or on the top of the well when pumping oil-water mixtures through hydrodynamic vortex generator.

On the reservoir in the vicinity of the area additionally be affected by the source of physical fields, such as vibro or an alternating elec is electromagnetic.

To maintain the achieved productivity is useful after processing of the productive formation into the borehole on a permanent job to lower pulse or wave devices on the period of operation of the well.

The method is as follows.

For assigned wells produce an analysis of geological-technical characteristics and field data on the basis of which is chosen in the interval of the productive formation level placement of the emitter, as well as the working fluid and chemical agents, such as water and pinacolato (aqueous solution mixture of hydrofluoric and hydrochloric acids). As a generator for vibration wave impact choose hydrodynamic generator, for example, type HDV-20 technological complex equipment "TRANTER".

In the well in the reservoir interval down on tubing (tubing) an oscillator, a packer with an anchor and, if necessary, documentation of downhole parameters, Autonomous multi-day deep unit, such as a manometer-thermometer. Set the estuarine reinforcement or preventer. From the annular valve pave discharge pipeline in technological capacity with the working fluid, for example, gutter capacity. To tubing through the discharge pipe connecting pump units for parallel operation, in which the end of the receiving arm is and with the filter down in the gutter capacity. In the working fluid add surfactant.

First on medium speed pumping unit to produce topping well before the advent of circulation. For spent liquid volume V [m3], density ρ [kg/m3]known to the drilling depth H [m] and the specific volume of the internal space of the well Vc[m3/metre] specify pressure by the formula:

PPL=ρg(H-V/Vc)·10-6[MPa],

where g=9,81 m/s2- acceleration of free fall.

Further include pumping units, produce washing well with the circulation through the chute capacity by pumping fluid through the tubing, generator, annulus, flow line with the release of contaminated fluid back into the tank, where the settling of suspended particles. The change in the flow rate of the pumps set the nominal mode of operation of the generator. The volume of the annular gap between the casing and tubing (annulus) Vtoand flow rate Q1calculate the time t=Vto/Q1when the first portions of the downhole fluid will be released on the mouth and you will select the first sample of the effluent. Subsequent samples are taken every 10-30 minutes depending on the release rate of plugging. In the samples visually appreciate the color and composition of the liquid (the presence of hard and soft frequent the C, emulsion, gas, and other) and the amount of sludge. In this mode work within 2-8 hours or to reduce the amount of suspended particles in the liquid. Using hydrodynamic generator, installed in front of the processed interval of the reservoir, excited high-amplitude pressure fluctuations, which are passed through the casing and perforating canals wells (or the wall of the open hole in the reservoir into the wellbore area in elastic oscillations of sufficiently high intensity. Elastic vibrations, along with incentives fracturing contributing to the destruction of deposits on the surface of the perforation channels in a porous medium is thixotropic dilution clay inclusions, the disintegration of the clogging material is weakened his connection with the breed, facilitated the transfer of particles by the fluid flow in the pore channels, and reduced blocking effect present phases - water, oil and/or gas, increased fluid filtration and removal of the clogging material into the borehole, resulting in a purified natural pore channels and increases water permeability stalk zone of the collector.

Next, produce periodic depression-repressione impact. This increase bottom-hole pressure within a certain time (the usual 15-60 min), sufficient for accumulation of high potential stock of elastic energy of compression of the fluid and rock in the most contaminated region of the PPP, near wells creates a zone of increased pressure, the so-called "funnel repression." The pressure increase is the easiest way to discharge the working fluid from the pumping unit, although you can increase the weight of the liquid column increases its density, and this is how to stop, and without interrupting. For qualitative evaluation of the filtration properties of the PPP in the process of increasing the pressure conducting hydrodynamic testing by determining the growth pressure and the subsequent monitoring of its fall. The maximum pressure limit of the pressure operating the casing. Then lower the bottomhole pressure and simultaneously include the flushing of the well. At this time, the accumulated elastic energy of compression of the fluid and rock starts to be released in the form of a spout from the reservoir towards the bottom-hole zone is formed local "depression funnel. When the spout together with the fluid flow and make the plugging and elastic vibrations intensify its removal. To create a depression you can use the injector or pump foam.

The alternation of depression and repression allows the near and the wellbore, in the most contaminated area, to create directed from the reservoir to the slaughter of large local pressure gradients, which can briefly exceed the pressure of the fracturing in absolute value, and this creates alternating elastic deformation in the perforation channels and stalk formation zone. When the vibrational effects are superimposed for more rapidly varying intensities of elastic deformation of the compression-rarefaction that intensifies as the actual formation of microcracks on the surface of the channels and along the radius from them, and the creation of additional cracks extended into the formation at high pressure gradients, and by reducing the pressure in the PPP facilitates the redistribution and reduction of residual elastic stresses and reduces spicemaster cracks, which increases the area of the open pores for filtering fluid.

With the increase in the number of alternations between depression and repression on the layer will be processed more distant from the wellbore region due to the creation of local gradients in further distributed kolmat zones, which leads to their sequential dissolution and removal of plugging into the borehole together with the flowing fluid. The result is a deep cleaning of the PPP and restore the natural Pronichev the ü.

To remove deposits that form surface forming mineral collector, strong chemical and physico-chemical relationships on stage repressional impact into the formation of one or more rims estimated volumes of reagents of different functional purpose - solvent, surfactant solutions, acids, alkalis and other active salts and reagents or compositions, including in the form of emulsions. Vibrational effects not only facilitates the introduction of the interlayers, small pores and low permeability zones of the reservoir, but also intensifies the action of reagents.

The second step is the isolation of the processed interval of the formation packer, followed by cyclic pressure change, for example periodic increase and decrease in bottomhole pressure discharge fluid pumping units, raising the pressure above the pressure of the pressurization performance of the casing, even to hydraulic fracturing. This is achieved by broadening and deepening educated cracks, is the initiation and establishment of a network of new cracks. During the subsequent injection of the working fluid and/or chemicals into the reservoir to raise the pressure in the reservoir, and with the simultaneous influence of elastic vibrations it formed extensive and deep network tre is in.

To cover a large area of the reagent layer effect, increase the rate of injection of the chemical agent and squeezing the liquid, then the reagent without losing its reactivity, manages to penetrate much deeper into the reservoir. With the same purpose can be added to the reagent, the reaction retarders. For carbonate reservoirs proven Neftechala emulsion, which, due to hydrophobic properties and compatibility with formation fluids from the formation is characterized by the ability to penetrate far into the carbonate reservoir to depletion reactivity. Properties it is similar to the acid reaction retarders, but lower in value. At the same time after introduction into the cracks in sufficient depth emulsion due to the high viscosity resists pumping and makes you enter into the work of other pores and cracks for introduction into the reservoir. If the rims of the emulsion to upload portions acid, along with the expansion of channels in the stalk zone they will be introduced into the pores of the rocks and reveal not covered by the influence of the crack.

Increased efficiency is achieved due to the uniformity of the interaction of the acid with rock at lower discharge pressure, increase the rate of reaction, creation and stimulation of existing cracks, which facilitates subsequent rational is ispolzovanie rims acid and neftegassrtoi emulsion to create the actual caverns drives. This reduces the risk of water inflow from a water-saturated interval.

With a gradual increase in pressure to the pressure of the hydraulic pressure fluctuations generated by the generator at the well bottom, creating in the stalk zone of elastic deformation of the reservoir, contributing to the formation of microcracks and the primary cracks fracturing at lower bottom-hole pressures. Subsequent development of cracks in the pressure fluctuations have a wedging action and contribute to the formation of additional micro - and microtrain, and when fixing the cracks facilitated the transfer of sandy fractions deep and it is more evenly distributed therein, thereby improving the efficiency of hydraulic fracturing. For intensification of the process on the reservoir in the vicinity of the area additionally be affected by the source of physical fields, such as vibro or alternating electromagnetic.

In the third stage after resorption and reduce the pressure in the borehole her master on the inflow of reducing it, for example by compression or by swabbing or during operation pump deep. To improve the efficiency of extraction from the formation of the reaction products development can best be achieved with the use of the injector in combination with oscillatory effect.

Next produce works is by putting the well into operation.

For continuous maintenance of the achieved productivity is useful after processing of the productive formation into the borehole on a permanent job to lower pulse or wave devices on the period of operation of the well. In injection wells lower hydrodynamic generators design "NPP OIL-ENGINEERING" type HDV technological complex "TRANTER" on a permanent suspension and include work in connection conduit. In producing wells lowered downhole pulse device type "UNIS" design "NPP OIL-ENGINEERING"that simultaneously with oscillatory effect of the pressure pulses to produce oil built-in pump deep.

During the development of deposits with complicated geological and physical conditions of the system focal appropriate wells in each well to make processing of the productive formation of the proposed method, which will increase the drainage area of each well and to involve stagnant zones with a corresponding increase oil recovery.

An example of the method in the injection well.

For processing the selected injection wells that discover in the depth interval 1790-1796 m terrigenous formation D1"b" Devonian sediments presents seal off alevra what it. The well is cased production column 146 mm with wall thickness of 7.75 mm, Porosity of the reservoir is equal to 17%, and average permeability is 0.58 μm2. Pressure of 16.5 MPa. The current acceleration of 0 m3/day at a pressure of 14.5 MPa.

Step 1.

Pre-made cumulative perforation in the interval of the reservoir hammer PC-105, for a total of 60 resp.

Pulled the alternator GDF-15 design "NPP oil-Engineering" with resonator and packer of PVM-122-1000 and anchor. With reference to radioactive well logging and locator set the generator in the middle of the interval of the formation.

Tied the mouth of the well with 2 pump units of the type CA-320.

Turned both units, produced topping 4 m3water (1.18 g/cm3) and rinse well. Tested well on the pickup - not accepting at a pressure of 16 MPa.

When you open strobe produced rinse well with oscillatory effects for 2.5 hours. The samples were kept suspended in black, the end - dirty-reddish color.

Produced 3 times depression-repressione impact. Experienced acceleration appeared weak absorption.

Stage 2.

The descent valve compressed tubing pressure of 34 MPa. Put the packer.

Produced cyclic variation of pressure increase and decrease in bottomhole pressure discharge fluid pumping units is, in the well at a pressure P=18 MPa began to take in consumption of 2 l/sec, then the injection pressure decreased to 10 MPa. When P=12 MPa flow rate 4 l/s at P=13 MPa accepts with a flow rate of 5 l/sec. plugged in the 4 pump unit SYN-31. Increased flow rate of the working fluid is first pumped 30 cubic meters of water, then 11 cubic meters of glyoxylate and in the end pushed 30 cubic metres of water. Left to lower the blood pressure, in addition has lowered hydrodynamic oscillation generator of the type HDV technological complex "Tranter" on a permanent suspension and included in the work from the conduit.

Step 3.

Produced the final work on putting the well into operation.

The results of measurements of the pickup when pumping from water consumption amounted to 250 m3/day at a pressure of 9.5 MPa.

An example of the method for the production wells.

For processing the selected production well uncovered productive carbonate sediments of the Bashkir middle Carboniferous. The perforation interval 982,0-992 m (100 resp. hammer ZPK-105C). Production column 146 mm Current slaughter 1201 m Reservoir pressure of 8.0 MPa. The oil production rate of 1.3 tons/day, the water content of 34.7%.

Pre-made cumulative perforation in the interval 983,5-986,5 m hammer ZPK-105C, for a total of 30 resp.

Lowered into the well the generator GDV-20 design the SPE oil-Engineering", through 2 pipes - packer type MVP-118 - 700 with an anchor-type YAGAMI, 1 pipe installed plug-in filter and through 2pcs. Tubing - reference nozzle. In the lower part of the resonator has established an Autonomous in-depth gauge-thermometer. With reference to radioactive well logging and locator set the generator at a depth of 985 meters

Changed the volume of liquid in the well for oil.

Stage 1

Produced rinse the wells with pumping oil from 2 pumping units of the type CA-320 in pipe mode circulation through the gutter capacity for 2.5 hours. Next undertook depression-repressione the impact of injection fluid into the formation at pressures up to 15 MPa and spout while simultaneously pumping fluid, and increased hydrostatic pressure by prekrivanja annular valve while continuing circulation and the maintenance of revolutions of the pumps. It was observed absorption liquid. Pumped into the reservoir hydrochloric acid 3 m3, pushed into the reservoir of oil in the volume of 6 m3.

Stage 2.

Put the packer. Tied 4 pump unit and 2 acidic installation for parallel operation. Produced cyclic variation of pressure increase and decrease in bottomhole pressure discharge fluid pumping units, and then included the pumping of oil from 2, and then 4 units. When the pressure of 21.5-22.5 MPa was observed sharp decrease is giving pressure to 19.5-20.0 MPa. After injection 5-6 cubic meters switched to alternating injection neftegassrtoi emulsion (for a total of 10 cubic meters) and acid (for a total of 4 cubic meters) and pushed oil 6 cubic meters Stopped at reduced pressure for 12 hours. The well began to pour out, choked flow oil-water emulsion.

Step 3.

Made a final effort to extract deep equipment and putting the well into operation, when lowered downhole pulse installation type "UNIS".

The results of measurements of the rate of inflow was 10.0 tons/day of dry crude oil.

The use of the invention allows to significantly improve the profitability of the treatment of wells by optimizing the sequence of operations in the implementation process, improve treatment, reduce hydrodynamic and geophysical research, energy and labor costs, timing of repair of wells and optimize the flow of chemicals, productivity and working conditions. In addition, improving the quality of the input of production wells in operation, increases the coverage area of impact and efficiency increases hydropobic minerals.

1. The processing method of the reservoir, including vibrational effects in the productive interval of the formation from the emitter, the injection of chemicals and rinse well, about odolanow system tubing and packer, characterized in that the reservoir create and develop new cracks and/or intensify existing by sequential leaching of the well working fluid, periodic depression-repressional exposure by flushing at the stage of circulation or spout, the isolation packer of the processed interval of the reservoir, the cyclic changes of pressure with subsequent injection of the working fluid, for example oil and/or at least one rim of the chemical, for example hydrochloric acid, while the above operation is performed when the oscillatory effects radiator mounted in front of cultivated productive interval of the formation.

2. The method according to claim 1, characterized in that the periodic depression-repressional impact in the reservoir additionally upload at least one rim of the chemical, for example a solution of surface-active substances, chemicals with acidic or alkaline reaction, hydrocarbon solvents or their compositions.

3. The method according to claim 1, characterized in that the carbonate formations with periodic depression-repressional the effects of additional pumping hydrochloric acid or its solutions and/or nepakeltu emulsion.

4. The method according to claim 1, characterized in that as the working fluid using oil, water, solutions for Ernesto-active substances, acids.

5. The method according to claim 1, characterized in that the periodic depression-repressione exposure is performed with the help of an injector.

6. The method according to any one of claims 1 to 3, characterized in that the periodic depression-repressione effects create weight of a column of liquid such as infill wells gas-liquid foam or solution of calcium chloride.

7. The method according to claim 1, characterized in that the periodic depression-repressional the impact of washing on the stage of circulation or spout increase the technological parameters of the working fluid, for example, pressure and/or flow, depending on the characteristics of the bottom-hole formation zone, for example, pickup.

8. The method according to any one of claims 1 to 5, 7, characterized in that the periodic depression-repressional impact exercise hydrodynamic testing and its results are judged on the time of transition to the isolation packer of the processed interval of the formation.

9. The method according to claim 1, characterized in that the cyclic pressure change is performed periodic increase and decrease in bottomhole pressure.

10. The method according to claim 9, characterized in that the cyclic pressure change is performed in several stages, until fracturing, gradually increasing technological parameters of the working fluid, such as blood pressure and R the assemblies.

11. The method according to claim 10, characterized in that after fracturing pump working fluid, for example hydrochloric acid, and additionally push its oil.

12. The method according to claim 10, characterized in that after fracturing a well is pumped fixing agent, such as a proppant.

13. The method according to claim 9, characterized in that one of the cycles increase the pressure in the reservoir pumped working fluid, for example an emulsion, the reagent solution with high viscosity.

14. The method according to claim 9, characterized in that a cyclic pressure change in case of strong absorption in the reservoir additionally upload isolating or blocking composition, such as an emulsion.

15. The method according to claim 1, characterized in that after the isolation packer of the processed interval of the formation of cyclic pressure changes start with injection rims acid.

16. The method according to claim 3, characterized in that the carbonate formations for injection rims chemical produce alternating the injection rims acid and neftegassrtoi emulsion.

17. The method according to any one of claims 1 to 3, 11, 15, 16, characterized in that the injected acid impose functional additives such as surfactants, demolicious, dispersant, anticaglia substances.

18. The method according to claim 1, wherein the pre with the create and/or initiate the initial process of cracking, for example, the powder charge.

19. The method according to claim 1, wherein the pre-determined parameters available in the productive formation of cracks, for example by the method of seismological side view of the wells, and they collectively define the parameters of elastic waves and the working fluid.

20. The method according to claim 1, characterized in that the emitter using hydrodynamic generators, such as pulse or with regular waves, or Electromechanical converters.

21. The method according to claim 1, characterized in that after the injection of at least one fringe of the chemical make removing the reaction products from the injector or pumping of foam.

22. The method according to item 16, wherein the processing of carbonate productive formation complete filling of the borehole reverse water-oil emulsion, cooking on the bottom or on the top of the well when pumping oil-water mixtures through hydrodynamic vortex generator.

23. The method according to any one of claims 1 to 5, 7, 9-16, 18 to 22, characterized in that the reservoir in the vicinity area is additionally affected by the source of physical fields, such as vibro or alternating electromagnetic.

24. The method according to any one of claims 1 to 5, 7, 9-16, 18 to 22, characterized in that after the treatment of the productive formation into the borehole on a permanent job opus the up pulse or wave devices on the period of operation of the well.



 

Same patents:

FIELD: oil production, particularly methods or apparatus for obtaining products from wells.

SUBSTANCE: method involves displacing working agent under elevated pressure and performing curing thereof. For bottomhole zone treatment bath for working agent having 4-6 m3 volume is provided in perforation interval and curing time is up to 9 hours. Working agent is displaced by discharge water in impulse draining mode including pressure increase at well head up to 11-13 MPa and pressure drop operations, wherein number of impulses is 30-50. Then 20-40 m3 of 3-8% hydrochloric acid solution is displaced, curing is performed for not more than 4 hours and discharge water is injected in amount of 20-40 m3.

EFFECT: increased intake capacity of well.

1 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to reducing clay constituent in critical areas of formation of both production and injection wells represented by low-permeation clayey terrigenous reservoir and/or of wells with reduced productivity due to clogging of pores with built-in foreign clayey material. Composition of invention contains 15.0-90.0% aqueous hydrochloric acid, 0.5-5.0% diammonium phosphate as additive, and solvent. In preferable embodiments, composition further contains 0.1-2.0% surfactant and/or 0.2-8.0% hydrofluoric acid. Composition produces enhanced favorable effect on critical area of formation owing to reduced swelling of clay, activation and dispersing followed by lifting of clayey material during well development period.

EFFECT: increased permeability of critical area of formation and slowed corrosion of oil-field equipment.

3 cl, 2 tbl, 27 ex

FIELD: oil and gas production.

SUBSTANCE: solid base 75.0-95.0% nitric acid-urea reaction products serving as acid reagent, 1.0-5.5% tertiary amines-hydrogen peroxide reaction product, 2.5-15.0% organic derivatives of phosphonic acid, e.g. nitrilotrimethylphosphonic acid or oxyethylidenephosphonic acid, and 1.5-4.5% nitrogen-containing corrosion inhibitor. Composition prepared on proposed base is more efficient owing to widened application area of composition including wells with formation temperature up to 100°C, successfully prevented, under these conditions, formation of stable oil emulsions with elevated iron-containing stabilizers level, removed water-oil emulsions from critical area of formation, preserved low corrosion activity, and excluded loss in active properties of base upon storage and transportation.

EFFECT: improved performance characteristics of formation critical area composition.

2 cl, 3 tbl

FIELD: oil and gas industry.

SUBSTANCE: composition contains hydrochloric acid, stabilizer and water, as stabilizer contains benzoic acid with following ratio of components in percents of mass: hydrochloric acid 7.8-9.5, benzoic acid 0.1-0.25, water 90.25-92.1.

EFFECT: broader functional capabilities.

1 tbl

FIELD: oil and gas production.

SUBSTANCE: composition, mainly intended for use in treatment of bottom-hole zone of carbonate oil formations, contains, wt %: inhibited 24% aqueous hydrochloric acid 10.0-15.0, acetic or hydrofluoric acid 2.0-4.0, oil extraction reagent 1.0-2.0, organic solvent 15.0-20, and water - the rest.

EFFECT: increased productivity of formation.

2 tbl

FIELD: oil industry.

SUBSTANCE: method includes feeding reversed oil emulsion into bed and also water solution of acid, as reversed emulsion, emulsion is used, containing following components, in percents of total: hydrocarbon liquid 26-40, oil-soluble nitrogen-containing emulsifier Sonkor-9601 or Sonkor-9701 0.4-5, water solution of inhibited 10% hydrochloric acid or argillaceous acid or water solution 1-10% of chlorine calcium or chlorine sodium the rest. As hydrocarbon liquid diesel fuel is used or liquid oil hydrocarbons of paraffin row, or unstable gas benzene, or light oil. Reversed emulsion maintains stability during 6-35 hours at temperature from 60 to 100°C during filtering through bed model with penetrability more than or equal to 0.2 mcm2. Time of feeding of reversed emulsion with filtering into bed should not exceed emulsion stability preservation time.

EFFECT: higher efficiency.

4 cl, 3 tbl

FIELD: oil and gas production.

SUBSTANCE: invention relates to oil recovery involving use of aqueous hydrochloric acid-based chemicals serving for integrated hydrochloric acid action on bottomhole oil formation zone in order to intensify oil and gas inflow therefrom, which invention being, in particular, designed for use in cases necessitating increase of oil recovery from low-permeable carbonate formations saturated with extra-heavy oil. -based composition contains 5-7% of aqueous acetic acid solution, 35-40% of by-product of sulfuric acid-catalyzed isobutylene/formaldehyde condensation taking part in production of isoprene, notably dimethyl-m-dioxan, and 20% aqueous hydrochloric acid to 100%.

EFFECT: increased bottomhole formation zone treatment efficiency due to stability of composition and depth, to which composition penetrates into carbonate formation, and also augmented choice of acid reagents for treatment of low-permeable formations.

4 tbl

FIELD: oil industry.

SUBSTANCE: device for complex treatment of face-adjacent well zone has thermal gas-generator charged with fuel with electric igniter and pipe-shaped container with acid solution, made with perforation apertures, both mounted on rope-cable. Acid solution is positioned in thermal-melting hermetic tank inside the container. Device is additionally provided with depression chamber and impact-wave effect chamber, containing remotely controlled fast-action locks, with two packers, mounted at ends of pipe-shaped container. Packers are opened under pressure from gases from gas generator. After operation of gas generator is finished, packers release pipe-shaped container. Depression chamber, impact-wave effect chamber and gas generator are jointly connected.

EFFECT: higher efficiency.

2 cl, 1 dwg

FIELD: oil industry.

SUBSTANCE: compound for processing face-adjacent bed zone includes mixture of inhibited hydrochloric and HCl and fluorine-hydrogen acid HF, non-ionogenic surfactant, asphalt-resin-paraffin precipitations solvent and water, additionally has mutual solvent and oxyethylenediphosphone acid and/or vinegar acid with following ratio of components in percents of mass: HCl 3-23, HF 0.5-5, surfactant 0.1-1, solvent 0.3-3, acid and/or vinegar acid 0.05-6, mutual solvent 10-30, water the rest. As mutual solvent compound contains low spirits: isopropylene spirits or methanol, or ethanol, or acetone, or spirits-containing industrial wastes.

EFFECT: higher efficiency.

2 cl, 3 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes injection of processing liquid into bed, which liquid contains solved or dispersed in water complicated ether and polymer destructor, selected from oxidizing destructor and ferment destructor in such a way, that complicated ether is hydrolyzed with production of organic acid for solution of material soluble in acid, present in filtering layer or adjacent to it or in other damage in productive bed, and polymer destructor destroys polymer material, present in filtering layer or bio-film in productive bed.

EFFECT: higher efficiency, simplified method, higher productiveness, higher ecological safety.

31 cl, 1 tbl, 1 ex

FIELD: oil industry.

SUBSTANCE: method includes pulse treatment of productive bed by energy of atmospheric electricity by using lightning discharge. Prior to initialization of storm discharge voltage of electric field above well is measured using measuring block. Initiation of storm discharge is performed when reaching value of strength of electric field above well no less than 30 kV/m and enough for forming leading channel of lightning. To exclude corona as receiver of electric energy metallic mast is used, on upper end of which metallic fragment of spherical form is positioned having smooth external surface, or smooth metallic wire is used with its possible raising towards storm cloud. Output of receiver is connected to casing column of well. Powerful electric discharge along casing column and through its perforated portion gets into area of productive bed and disperses there.

EFFECT: simplified method, simplified construction of device, higher product yield.

2 cl, 1 dwg

FIELD: mining industry.

SUBSTANCE: processing periods include forming of depression pressure change between well-adjacent bed zone and well hollow. Cleaning of well-adjacent bed zone is performed by prior feeding of fluid into well, forming of periodic pressure pulses in well-adjacent bed zone in form of fading standing wave, moving along the well, and decreasing pressure during fluid movement along well from well-adjacent bed zone to day surface for extraction of clogging. Plant for washing wells is used, which is connected to behind-pipe space of well and to tubing pipe. Behind-pipe space of well is isolated by packer along lower limit of perforation range. Perforation range is filled with sedimentation, formed from destroyed rock, and accumulated above packer as a result of gradual and even cleaning of well-adjacent bed zone along whole length of perforation range. Packer is disabled and well is washed clean, without raising tubing pipes column.

EFFECT: higher efficiency.

1 dwg, 1 ex

FIELD: oil industry.

SUBSTANCE: method includes determining dominating frequency of productive bed by performing prior vibration-seismic action using surface oscillations source at different frequencies and analysis of seismic graphs from seismic receivers in product wells. Vibration-seismic effect on watered portion of productive bed of oil deposit is performed by a group of surface oscillations sources, operating at dominating frequency of productive bed. Bed fluid is extracted via product wells. After vibration-seismic effect on watered portion of productive bed of oil deposit by a group of surface oscillations sources, operating at domination frequency of productive bed, concurrent vibration-seismic effect is performed using two sub-groups of said group of surface oscillation sources. Each sub-group of group operates at determined from mathematical dependence. Average frequency of surface oscillations sources of whole group is equal to dominating frequency of productive bed. Difference in frequencies, on which each sub-group operates, is determined in accordance to linear size of watered portion of productive bed of oil deposit and is satisfactory to mathematical dependence. Concurrent vibration-seismic effect by two sub-groups of said group of surface oscillations sources is performed with forming of wave having length exceeding length of wave with dominating frequency.

EFFECT: higher oil yield.

2 ex

FIELD: oil industry.

SUBSTANCE: device for complex treatment of face-adjacent well zone has thermal gas-generator charged with fuel with electric igniter and pipe-shaped container with acid solution, made with perforation apertures, both mounted on rope-cable. Acid solution is positioned in thermal-melting hermetic tank inside the container. Device is additionally provided with depression chamber and impact-wave effect chamber, containing remotely controlled fast-action locks, with two packers, mounted at ends of pipe-shaped container. Packers are opened under pressure from gases from gas generator. After operation of gas generator is finished, packers release pipe-shaped container. Depression chamber, impact-wave effect chamber and gas generator are jointly connected.

EFFECT: higher efficiency.

2 cl, 1 dwg

FIELD: oil industry.

SUBSTANCE: device has receiving chamber with solid-fuel charges and igniter, combustible plug and air chamber with atmospheric pressure. Receiving chamber is perforated along whole length by apertures for outlet of combustion products. Charge adjacent to upper end of receiving chamber burns from its end. It is made of heat-resistant low-gas slow-burning compound with high temperature of combustion products and high caloricity, with low dependence of burning speed from pressure and it is protected from burning at side surface by compound preventing burning thereon, but burning together with charge. Charge, adjacent to plug, is of channel construction, quick-combustible, and it is made of heat-resistant gas-generating compound. Igniter is mounted in upper end of charge, adjacent to upper end of receiving chamber. Air chamber with atmospheric pressure is placed below receiving chamber.

EFFECT: higher efficiency.

2 cl, 1 dwg

FIELD: oil industry.

SUBSTANCE: device has pump, placed on well mouth equipment, tubing string, passing downwards in casing string of well. Node of hollow cylinders is connected to lower portion of tubing string. A couple of pistons is placed inside cylinders node and connected to pump via pump bars and gland rod. For compression of liquid within cylinders node, pump is enabled. Compressed liquid is outputted into casing column, and strike wave is formed as a result. Cylinders node includes upper cylinder, lower cylinder. Transfer cylinder is placed below upper and above lower cylinders. Cylinder with compression chamber is placed between transfer cylinder and upper cylinder. Lower cylinder is made with possible placement of lower piston, and upper cylinder is made with possible placement of upper piston. Lower piston has larger diameter, than upper piston. Displacement of piston affects volume of compression chamber, decreasing it. Liquid in the chamber is compressed. During downward movement of piston liquid is lowered into well. Seismic data from wells at remote locations are gathered and processed.

EFFECT: higher efficiency.

4 cl, 9 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes forming of gas pillow by forcing gas into inter-tubular space. Further pushing liquid is forced therein with forcing away of liquid from inter-tubular space along tubing column into tank or store, pressure is dropped from inter-tubular space down to atmospheric and hydro-impact is used to effect well face by rotating liquid flow from tubing column. Pillow is formed by plant for forcing pushing liquid and gases. As gas, mixture of air and exhaust gases is used in relation no greater than 2:3. pillow pressure provides for prevention of gas from getting into tubing column. Volume of pushing liquid is determined from formula: Vpl=0.785.(d

21
-d22
).(HT-Hgp-Hi-t).10-6, where d1 - inner diameter of casing column, mm; d2 - outer diameter of tubing pipes, mm; HT - depth of lowering tubing column in well, m; Hgp - height of gas pillow in inter-tubular space, m; Hgp=K·Pgp; K - hydrostatic coefficient of resistance to pushing of liquid and gas (K=100 m/MPa), m/MPa; Pgp - end pressure of gas pillow, MPa; Hi-t - inter-tubular space height.

EFFECT: higher safety, higher efficiency.

3 cl, 2 dwg, 2 ex, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.

EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

The invention relates to mining and can be used for development and rehabilitation of well production wells, reduced due to clogging of wellbore zone of asphalt formations and solids

FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

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