RU2462586C2 - Method of synergetic reactant-impulse-wave treatment of bottom-hole formation zone and plant for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method of reactant impulse treatment of bottom-hole formation zone includes replacement of killing liquid in casing string with active liquid reactant medium upon simultaneous repressive-impulse action, when active liquid reactant medium reaches roof of productive formation it is pumped into bottom-hole formation zone under repressive-impulse action, then there is repeated implosion action with formed passive medium being removed from bottom-hole formation zone, the passive medium contains products of destruction of asphalt-resin wax deposits and of other colmataging formations, till pumped volume of active liquid reactant medium is removed, then bottom-hole formation zone is treated through annular space under repressive-depressive impulse action of killing liquid with addition of water-repellent SAS, active liquid reactant medium is used as a solvent with addition up to 5 wt % SAS, the pumping is performed under nanowave repressive-impulse action with alternating depressive impulses. Plant for reactant-impulse treatment of bottom-hole formation zone, containing casing string, installed in succession swabing device, packer, impulse depressive generator which radial channels are at the same level with lower perforation holes of well perforation interval, the generator is installed on day surface with possibility of connection to both casing string and annular space, impulse wave depressor with discharge chamber provided with free hydraulic output to reservoir, is provided with pressure multiplier with impulse nanogenerator installed before impulse depressive generator.

EFFECT: recovery and increase of efficiency and initial permeability of well bottom-hole formation zone.

2 cl, 1 ex, 1 dwg

Description

The invention relates to the oil industry and can be used to clean the bottom-hole formation zone (PZP) of producing and injection wells from clogging materials, including the removal of asphalt-resin-paraffin deposits (paraffin deposits), acid treatments (KO) with target chemicals for recovery and claying of the reservoir during the development, resuscitation and increase of productivity of wells, including those operated in complicated geological and physical conditions.

A known method of reagent-pulse-implosion processing of PPP, in accordance with which a complex of technological equipment, consisting of swab, packer, depression pulse generator (DGI), is lowered into the well on the tubing and placed in such a way that the radial channels of the DGI are at the same level with lower perforations of the hole perforation interval. Using a swab installation, fluid is taken from the tubing, creating a certain level of differential pressure of the fluid in the tubing and the annulus, at which there is an instantaneous opening of the DGI valve and the fluid from the annulus rushes into the tubing, creating a sharp decrease in pressure in the annulus. A deep impulse of depression occurs at the bottom of the well, causing accelerated fluid movement in the near-wellbore zone. After filling the implosion chamber with liquid, the hydrostatic pressure of the liquid column in the annulus creates a repression pressure impulse, which propagates in the bottomhole zone of the well. The creation of multiple and alternating in time pulses of depression and pressure pulses leads to the destruction of stable emulsions, loosening of paraffin deposits and the formation of microcracks in the rocks of the bottom-hole zone. At the same time as pumping out the killing fluid through the tubing, a composition of liquid chemicals is fed into the annulus of the well to destroy and subsequently remove the clogging contaminants of an organic and inorganic nature. After replacing the killing fluid with reagents for the destruction of colmatants, the swab operation with simultaneous depressive and repressive action on the formation is stopped, the wellhead is shut off, the required overpressure in the annulus of the well is created (but not more than the pressure of the casing pressure) and the liquid chemical reagents are forced into the PPP using a kill fluid in a volume of not less than 1.1 m ³ (m perforation interval), after which technological exposure is carried out in accordance with the regulations. Anhydrous oil with the addition of cationic surfactants can be used as a kill fluid at this stage. After the technological exposure is completed, the packer is brought into working condition and, using a swab unit complete with DGI, the products of destruction of collimatants are removed from the PZP, creating multiple depression pulses. At the last stage, the packer is brought into a transport state and the final depression-repression-impulse effect on the bottom-hole zone is made with a kill fluid with hydrophobization of the pore space of the bottomhole zone of the producing well (RF Patent No. 2376455. Publ. 2009).

However, this processing method and the installation for its implementation cannot be used in oil and injection wells with low initial or current injectivity, since the upper limit of the pressure of injection of reagents through the annulus is limited by the pressure of the casing. In addition, the maximum frequency of the pulsed action will be the proportion of HZ, and therefore, the output of the resonant frequency of stimulation, as the most effective, is out of the question.

There is also known a method of nanowave processing of the PPP and installation for its implementation. The method is carried out using the installation of a nanowave processing PZP containing a string of tubing, a jet pump or swab installed on it, under which a packer, a pressure multiplier with the ability to move along the well and a depressive pulse generator (DGI) are sequentially placed, which contains the pressure multiplier with the nanogenerator, and the radial channels of the DGI are at the same level as the lower perforation holes of the well perforation interval. The pressure multiplier comprises a housing connected to the tubing string, in which a receiving chamber is made, a central channel for hydraulic communication with the DGI and lateral axial channels for communication with a pressure accumulation chamber formed by the housing and pistons, supported by a disk spring assembly mounted on a stop, which has a piston and the indicated block are seated through the adapter tube on the cantilever part of the housing above the adapter pipe connecting the DGI, ring profiled opposite to each other are fixed to the housing and piston nozzles, in the pin holes of which are rigidly mounted with the possibility of pairwise contact at the initial position of the piston, cylindrical elements made of piezoceramics. In accordance with the principle of operation of the installation during the operation of MGI, profiled nozzles periodically open the accumulation chamber under the action of a fluid flow, the pressure in which drops, and under the influence of disk springs the nozzles collide with each other through piezoelectric elements. Due to the occurrence of the piezoelectric effect, the fluid is electrified and magnetized, followed by cavitation, while the simultaneous hydrodynamic effect sharply increases the cavitation effect by 4-5 times, lengthening the cavitation torch, and when the fluid is magnetized, the effect of the target surfactants sharply improves. During the periodic propagation of nanowaves in the capillaries, adhering particles and colmatants detach from the walls of the pore channels, dissolve or disperse, and then, when swabbing or operating the jet pump, the destruction products are removed from the PPP (RF Patent No. 2376454, publ. 2009).

The specified method allows you to effectively produce a depressive-repression-pulse effect on the capillary system of the reservoir environment with the phased effects of kill fluids and solutions of chemical calculations in the nanowave field of capillary flows, which leads to the cleaning of capillaries and the formation of microcracks in rocks while the destruction of paraffin deposits and dispersion of hard coatings in the mode of hydrodynamic and nanowave exposure to active process media.

However, as noted earlier, with a low injectivity of both production and injection wells, the lips of the multiplier flat head will, when creating excessive pressure in the system, be practically in the open position and no nano-wave effect will occur.

In addition, the injection of the active reagent liquid through the annulus can also not be carried out for the above reason, at least without additional repression, depression and impulse effects on the injected fluid.

Closest to the claimed method and device are the method of repression-depression-implosion treatment of PPP and the device used in this case, where the method includes pumping through the annulus of an active reagent liquid medium - a hydrocarbon solvent with the addition of 0.05-0.1 wt.% Surfactant with by replacing the kill fluid in the tubing string during repression-depression-pulse treatment, after bringing the specified active medium to the roof of the reservoir, pumping it into the PPP with alternating repression-depression action, then a multiply repeated implosive effect with the removal of the formed passive medium from the PZP to remove the injected volume of the active medium and subsequent injection during the repression-depression-pulse action of the kill fluid with the addition of 0.1-2 wt.% hydrophobizing surfactant for producing or hydrophilizing surfactants for injection wells. In this case, the installation comprises DGI installed on the tubing, a packer and a swab located above it, and a pulse-wave depressor located on the day surface (RF Patent No. 2376453, publ. 2009).

However, this method and installation are inherent to the above disadvantages.

The objective of the invention is to restore and increase the coefficient of productivity and initial permeability of the bottom-hole zone of the formation — the bottomhole formation zone of oil and gas condensate wells, increasing the injectivity of injection wells due to the destruction of oil-water emulsions, removing loosely bound water, dissolving and peptizing sediments of solid colmatants and asphalt osmoloparaffin hydrophilization or pore space with a simultaneous decrease in the entrainment of particles of contaminating fluids deep into the reservoir when phased application of chemical reagents and simultaneous vibration microwave exposure with optimal indicators of depression and repression on the reservoir.

The problem is solved in that in the method of reagent-pulse treatment of the bottom-hole zone of the formation — PZP, which includes replacing the kill fluid in the tubing string — tubing with an active liquid reagent medium — ALC with simultaneous repression-pulse action, after bringing the specified active medium to the roof of the reservoir - its injection into the PZP with repression and depression, then repeatedly repeated implosion exposure with removal of the formed passive medium from the PZP containing products of destruction of asphalt-resin-paraffin deposits - paraffin deposits and other clogging formations, before removing the injected volume of the specified active medium and subsequent processing of the bottomhole formation zone through the annulus under the repression-depression-pulse action of the kill fluid with the addition of hydrophobizing or hydrophilizing surfactants, use AFL in the form of a solvent with an additive up to 5 wt.% surfactant, and the indicated replacement and injection is carried out with a nanowave repression-pulse action with alternating Misia depression pulses.

The problem is also solved by the fact that the installation for reagent-pulse processing of PZP, containing a tubing string - tubing, sequentially mounted swab device on it, a packer, a depression pulse generator - DGI, the radial channels of which are flush with the lower perforations the interval of perforation of the well, and installed on the day surface with the ability to connect both to the tubing and to the annulus of the pulse-wave depressor with a discharge chamber, and which has a free hydraulic outlet to the technological tank, it is additionally equipped with a pressure multiplier installed in front of the generator with a nanogenerator of pulses.

Thus, the inventive method, involving the use of the inventive installation, is a synergistic reagent-pulse-wave treatment of PZP and includes replacing the kill fluid in the tubing with active process fluids - ATZ with surfactant with simultaneous nanowave and infra-frequency exposure, bringing ATZ with surfactant to the roof of the formation , sealing the annulus and pumping ATZH into the formation with simultaneous wave and infra-frequency impact with the periodic creation of a "standing wave" with a sharp discharge and rise pressure in the tubing, holding the well to react with ATZ, then repeatedly repeating the pulse-implosive effect with the removal of the formed passive medium from the BCP containing the fracture products of the paraffin and other colmatants, until the injected volume of the reagents and fracture products is removed, the annulus is depressurized and then pumped through annulus with repeated repression, depression, and pulsed action of surfactant target solutions for hydrophobization or hydrophilization of the pore space, depending ty on the type of reservoir and the purpose of the well.

The essential features are:

- replacement of the kill fluid in the tubing with an active reagent liquid medium - ARZhS with simultaneous nanowave and infra-frequency-wave effects on the PZP;

- injection of ARS from the tubing into the PPP for the destruction of paraffin deposits, the dissolution or dispersion of colmatants, the destruction of emulsions and hydroxides of iron, the removal of loosely coupled water with constant nanowave and infra-frequency effects on the PPP and the dynamic mode of translational-return motion due to the operation of the pump unit complete with ground interrupter pressure

- removal of the products of the destruction of paraffin and sedimentation particles by repeatedly repeated implosion-pulse unloading of the well in the amount of not earlier pumped ARHS taking into account the products of dissolution and dispersion;

- repression-depression-pulse impact on the bottom hole through the annulus using a ground pressure breaker with hydrophobizing or hydrophilizing surfactant solutions after removal of paraffin and other contaminants from the pore space using an impulse-pulse device;

- the use of solvents, both inorganic and organic, with the addition of surfactants in the amount of up to 5 wt.%, as ARGS, i.e. 0-5 wt.%.

The drawing shows a nanowave repression-depression-implosion unit, designed to implement the described method and consisting of a nanowave and infra-frequency pulse generator - 2 installed on the tubing - installed above it above the packer perforation zone - 3, a depression pulse generator (DGI) - 4 located before the implementation of the method at or slightly lower than the perforation of the PPP, a hydraulic unit - pump - 5 is installed on the day surface for pumping ARGS, and to remove the destroyed paraffin deposits and matantov swab unit is provided with - 6, on the surface as set adapted to connect to both the tubing and annulus PW depressant (SVS) - 7 and drain capacitance - 8 (Figure 1).

The claimed method implements using the claimed installation the following technological operations:

1. Replacing the LH with ARGS in the tubing with the removal of the LH through the working nanowave and infra-frequency wave pulse generator into the annulus and onto the surface into the drain tank.

2. The injection of ARHS into the formation through a working nanowave and infra-frequency wave generator with periodic connection of the IED to the tubing for wave unloading, creating a “standing wave” in the well and more efficient closing and opening of the jaws of the flat-head generator head during the corresponding periods of pressure decrease and increase.

3. Removing the products of the destruction of paraffin and colmatants by implosion-wave swabbing.

4. Hydrophobization or hydrophilization of the pore space of the PPP in the mode of repression, depression and impulse exposure using the IED and DGI.

At the same time, solvents — acidic and clay-acid compositions, hydrocarbon solvents — Nefras A — 150/200, Nefras AK, a mixture of aromatic and aliphatic solvents with the addition of surfactants — demulsifiers — Penta 491-M, Synterol, diproxamine 157-65M, Reopon are used as ARHSs. IC and others in an amount of up to 5 wt.%, As an extinguishing liquid can be used: anhydrous oil from oil treatment plants - UPN with the addition of demulsifiers, such as: Penta 491-M, TN-10, SNPCH-4480 and others in concentration 0.01-0.1 wt.%, Mineral formation water, water races salts of salts with additives of complex surfactants, including Neftenol K, Sofoksal MFK, Sinol KAM, Sinol AN-1 and others with a concentration of 0.3-4 wt.%. At the stage of hydrophobization of the pore space of the PZP, cationic oil-soluble surfactants - Don-52, Penta 804 and others in the concentration of OD - 1.0 wt.% Are added to the oil-based killing liquid, to the water-based liquid - Neftenol K, Neftenol GF, IVV- 1, Catamine AB and others in a concentration of 0.5-1.5 wt.%. For hydrophilization of the pore space of the PPP, water-based killing fluids with the addition of anionic surfactants such as Neftenol NZ, Sulfonol, Oksifos B and others in a concentration of 0.3-2 wt.% Are used.

An example implementation of the method.

At the initial stage of the treatment cycle, the ZhG well is muffled with anhydrous oil with the addition of 0.5% diproxamine 157-65M, the downhole equipment is removed and a set of equipment consisting of a packer, nanowave pulse generator and DGI is lowered to the tubing to the bottom. Immediately before installation, the nanowave generator and the DGI are adjusted to a specific response pressure, the value of which depends on the geological and technical characteristics of a particular well.

On the surface, a hydraulic unit and an IED are connected to the tubing through a bell, which, like the annulus, is connected to a drain tank.

The killing fluid in the tubing is replaced with ARZhS - a hydrocarbon solution of the demulsifier D-157-65M at a concentration of 0.5 wt.% In the hydrocarbon solvent SNPCH - 7r-14 or a mixture of 30% Nefras AK with a direct-flow gasoline fraction and the addition of 0.02 wt. % Penta 491-M. Upon reaching the specified pressure drop in the tubing and well at the level of the bottomhole zone, the nanowave generator is triggered with the generation of nanowaves and waves in the infra-frequency range (50-300 per minute).

After replacing the silencing fluid in the tubing with ARGS, the packer is planted and ARGG is crushed into the reservoir through a pressure multiplier with a nanowave generator during periodic operation of the pulse-wave depressor at the mouth for wave unloading and creating a standing wave in the well. The resulting depression pulses in the tubing at the level of the bottom hole zone cause the depression of the pulse generator, which enhances the effect of “washing” the pore space with the injected reagent.

The creation of multiple and alternating time pulses of pressure and pulses of depression when injected into the ARZS PCB destroys stable emulsions, paraffin deposits and iron hydroxides, dissolves or disperses colmatants, and also removes loose water.

At the next stage, the packer is transferred to the transport state, the wellhead valve is closed, and PZP is treated through the annulus with a kill fluid with a hydrophobic additive of 0.5 wt.% Don-52 with alternating repression and depression due to the repeated repetition of the operation of the IVD.

Depending on the type of PZP contamination and the type of reservoir, other ARZh options may be used in other wells.

After hydrophobization of the bottom hole, technical equipment is removed from the well, pumping equipment is lowered onto the tubing and the well is put into operation. Before the proposed bottom-hole treatment, the well production rate was 1.3 tons / day, and after treatment it became 5.7 tons per day for oil with a simultaneous decrease in water cut by 14%.

The application of the proposed method of synergistic reagent-pulse-wave treatment of the bottom-hole zone of the formation and equipment for its implementation in the processing of the bottomhole formation zone of producing oil, gas condensate and injection wells will allow increasing the productivity of the wells at minimal cost.

Claims (2)

1. The method of reagent-pulse treatment of the bottom-hole formation zone (PZP), which includes replacing the kill fluid in the tubing string with an active liquid reagent medium (ALC) with simultaneous repression-pulse action, after bringing the specified active medium to the productive roof the formation injecting it into the PZP with repressive-depressive effects, then repeatedly repeated implosive effects with removal from the PZP of the formed passive medium containing the products of the destruction of asphalt-tar and paraffin new sediment (ARPD) and other colmatating formations, until the injected volume of the specified active medium is removed and the subsequent treatment of the bottomhole zone through the annulus with the repression-depression-pulse action of the kill fluid with the addition of hydrophobizing or hydrophilizing surfactants, characterized in that they use AHRS in the form of a solvent with by adding up to 5 wt.% surfactant, and the indicated injection is carried out with a nanowave repression-pulse action with alternating depressive pulses themselves. 2. Installation for reagent-pulse processing of PPP, containing a string of tubing, tubing, a swab device, a packer, a depression pulse generator (DGI) sequentially installed on it, whose radial channels are at the same level with the lower perforation holes of the well perforation interval , and mounted on the day surface with the ability to connect both to the tubing and to the annulus of the pulse-wave depressor with a discharge chamber having a free hydraulic outlet in t hnologicheskuyu container, characterized in that it is further provided with an upstream pressure multiplier DGI nanogenerators pulses.

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