RU2478778C2 - Treatment method of productive formation, and downhole equipment for its implementation - Google Patents

Treatment method of productive formation, and downhole equipment for its implementation Download PDF

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RU2478778C2
RU2478778C2 RU2010120080/03A RU2010120080A RU2478778C2 RU 2478778 C2 RU2478778 C2 RU 2478778C2 RU 2010120080/03 A RU2010120080/03 A RU 2010120080/03A RU 2010120080 A RU2010120080 A RU 2010120080A RU 2478778 C2 RU2478778 C2 RU 2478778C2
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formation
repression
cycles
depression
reservoir
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RU2010120080A (en
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Валерий Петрович Дыбленко
Олег Леонидович Кузнецов
Вячеслав Николаевич Манырин
Юрий Васильевич Еременко
Ришад Яхиевич Шарифуллин
Марс Магруфович СУФИЯРОВ
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Валерий Петрович Дыбленко
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/003Vibrating earth formations
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B28/00Vibration generating arrangements for boreholes or wells, e.g. for stimulating production

Abstract

FIELD: oil and gas industry.
SUBSTANCE: treatment method of productive formation consists in a cyclically alternating operation of repression on the formation with pumping of process fluids to the formation and depression on the formation so that an influx is caused. Wave action with elastic vibrations on treated medium is performed with a hydrodynamic generator installed in the well opposite productive interval. Values and/or creation velocities of repression and depression are adjusted in cycles. Regular wave action controlled as per amplitude-frequency parameters is performed. Monitoring of running of filtration processes, decolmatation and fracture formation in formation medium is performed, on the basis of which control parameters, wave action parameters in further cycles of repression and depression and divider of those cycles as to time are determined and assigned in a feedback mode. Values and/or velocities of creation of repression and depression in cycles are controlled with their subsequent increase. Their initial minimum values are determined and assigned depending on filtration capacitance parameters of formation medium, and at the same time, hydraulic impact pressure pulses are created from time to time in the well fluid.
EFFECT: improving efficiency of action and directed conversion of rock medium of bottomhole area and formation, and enlarging functional capabilities of the device.
9 cl, 1 ex, 5 dwg

Description

The invention relates to the oil and gas industry and can be used in carrying out intensification work to increase well productivity and control inflow and injectivity profiles in conditions of insufficient permeability of reservoirs, incomplete development of wells after drilling, volumetric pollution of pores and collector channels of various sludges and deposits of resins, paraffins and salts, in particular when processing carbonate formations.

Known methods of processing productive formations based on injections into the reservoir of various process fluids — solvents and converters of the structure of the mineral reservoir of the formation, which use solutions prepared on the basis of various chemical reagents (RF patents No. 2055983, No. 2173383, 2070963, 2004783, class. E21B 43/27). The effectiveness of these development methods is insufficient and greatly decreases in complicated conditions in the absence of development of filtration channels in the bottom-hole formation zone (PZP) and their blocking by chemical reaction products during processing.

There are also known methods of treating the bottom-hole zone of the formation, in which it is proposed to create pressure pulses in the well fluid in order to transform the reservoir structure, form new filtration channels and cracks in the formation rocks (Patents of the Russian Federation No. 2191259, CL E21B 43/263, No. 2209960, 2095561, 2091570, class E21B 32/27, No. 2065949, US patent No. 4548252, class E21B 43/263). The disadvantages of these methods are the low efficiency of the transformation of the rock structure of the formation in complicated conditions, due to the disposability and low controllability of the impact. Cleaning of the pore medium and the formation of new filtration channels in the most polluted areas of the bottomhole formation zone and formation are not achieved, with an increase in the amplitude of the generated pulses, the effect is localized in the most permeable areas with a high probability of new crack channels entering unproductive and flooded areas, and there is a risk of damage to the structural elements of the well.

The closest analogue in technical essence is the method of processing the bottom-hole formation zone (RF Patent No. 2191896, CL E21B 43/25, 28/00, publ. 10/27/2002). SUBSTANCE: method involves vibrating a microwave onto a treatment zone of a formation using a hydrodynamic oscillation generator, cyclically alternating operations of repression on the formation with the injection of technological fluids into the formation and depression on the formation with the inflow causing. In the initial, final and at least one intermediate pressure increase cycles, hydrodynamic testing of the bottomhole zone of the well is carried out, on the basis of which the processing mode is set. In the pressure reduction cycle, the treatment mode is adjusted. To clarify the incoming information, hydrodynamic testing can be repeated.

The operations of the cyclic repression-depressive action carried out in this method under the simultaneous wave action by elastic vibrations, the regular wave action controlled by the amplitude-frequency parameters and the monitoring of processes in the reservoir medium, on the basis of which the wave action parameters are assigned in the feedback mode, can improve the efficiency impact on the reservoir to clean existing filtration channels, the development of existing cracks, their washing removal of impurities and reaction products on the surface.

However, the effectiveness of the directed transformation of the mountain environment of the reservoir into FZP to ensure free filtration in the FZP with high coverage factors, both in thickness and along strike, is not high enough. The regulatory functions of the wave action by elastic vibrations are not used effectively. The cleaning of pore channels and cracks in the reservoir zone is intensified mainly in the areas of existing filtration flows, and the development efficiency of new fractures is low. In the absence of the controls and impacts that we offer, the most “weakened” zones of the formation rock structure are transformed, first of all, the cleaning, opening and development of existing cracks is initiated, which increases the anisotropy of the filtration flows and the departure of technological reagent fluids into unproductive zones through highly permeable channels. This disadvantage is especially evident in well treatments that open carbonate formations of pore-fractured formation.

Also known is downhole equipment for processing the bottom-hole formation zone (RF Patent No. 2175718, class E21B 43/25, published in B.I. No. 31, 2001), including a jet pump with a housing mounted on a packer on a pipe string. A hydrodynamic flow oscillation generator is installed under the packer at the end of the pipes at the level of the perforation interval and is hydraulically connected to the discharge line through the transfer channel. At the output of the hydrodynamic generator, a resonator-transformer can be located, made in the form of a pipe with slots and a reflector and installed at the lower end at the level of the perforation interval.

This equipment provides constant periodic operation in a certain hydrodynamic mode of both a jet pump and a hydrodynamic generator, allows for the impact through the wells of elastic vibrations on a productive reservoir environment under conditions of a sufficiently deep depression in the reservoir, and the injection of reagent fluids into the reservoir. However, the effectiveness of the impact on the creation of new fracturing and the development of new filtration channels with coverage of the entire thickness and volume of the formation, especially in conditions of reduced permeability and heterogeneity of the formations, is insufficient.

The objective of the invention is to increase the effectiveness of the impact and directional transformation of the mountain environment of the bottomhole formation zone and the formation due to the development of a network of deep cracks and filter channels along the full volume of the formation, with the initiation of cleaning and cracking processes in areas with low permeability, increase in coverage by effective impact both in thickness and in the extension of the reservoir, the expansion of the functionality of the method and device.

The solution to this problem is achieved by the fact that in a method of treating a productive formation, which includes cyclically alternating operations of repression on the formation with the injection of technological fluids into the formation and depression on the formation with an inflow, the wave action of elastic vibrations on the medium being treated by a hydrodynamic generator installed in the well opposite the production interval , regulation of the magnitude and / or speed of the creation of repression and depression in the cycles, conducting controlled by the amplitude-frequency parameters of in the presence of an ardent wave action and monitoring the development of filtration processes in the formation medium, decolmatization and crack formation, on the basis of which control parameters are determined and assigned in the feedback mode, the wave action parameters in subsequent repression and depression cycles and the duration of these cycles in time, according to the invention, / or the rate of repression and depression in the cycles is regulated with their sequential increase, while their initial minimum values are determined yayut and assigned depending on the parameters of reservoir formation fluid are periodically and simultaneously create a borehole fluid pressure of hydraulic pulses.

Moreover, in an optimal embodiment of the invention, it is advisable:

- when adjusting the parameters of depression and repression cycles, record and analyze acoustic emission signals or electromagnetic emission signals from the formation, and analyze them in real-time fractal analysis;

- at the beginning of the implementation of the method, as well as periodically during the cycles of repression and depression, carry out hydrodynamic testing of the bottom-hole zone of the formation, the results of which should be taken into account when monitoring the development of filtration processes in the formation medium, decolmatization and crack formation;

- at least in one of the repression cycles, compressible fluids are pumped into the treated formation medium at the same time as a wave, and then extracted during the creation of pulsed depressions, while gas-liquid mixtures, water-oil emulsions, foams, and chemical reagents can be used as compressible fluids;

- compressible fluids to be created directly during processing during the injection of process fluids into the reservoir, while using carbon dioxide, hydrocarbon gases, nitrogen, air, exhaust gases from internal combustion engines of the wellhead equipment or their mixture as injected gas, or use the gas generated as a result of a chemical reaction of a reagent process fluid with formation reservoir rocks;

- when controlling the amplitude-frequency parameters of the wave action, initiate polyfrequency elastic vibrations in the formation with a set of dominant frequencies in the range of 0.1-1800 Hz, while processing the signals of seismic acoustic emission from the reservoir medium, and determine the dominant frequencies of the polyfrequency influence based on analysis signals of these emissions.

The problem is also solved by the fact that the well-known downhole equipment, including a jet pump mounted on a packer on a pipe string, a resonator-transducer in communication with the output of a hydrodynamic flow oscillation generator and made in the form of a pipe, the resonator-transducer being installed with a lower ring at the level of the perforation interval and a hydrodynamic generator is located under the packer and is hydraulically connected to the discharge line through the transfer channel of the packer, according to the invention is equipped with a water hammer a device made in the form of a housing with inlet channels mounted on a pipe string, inside of which cylinders with central overflow channels are provided with axial movement, provided with locking elements.

In this case, the locking elements can be made in the form of balls with seats, and the cylinders are provided with a central transfer channel and side transfer channels.

Also, the locking elements can be made in the form of a piston equipped with transfer channels of different cross-sectional areas with the possibility of axial movement limited by elastic elements.

The resonator Converter can be made with the possibility of installation with emphasis on the bottom hole.

The essence of the invention is as follows.

At all stages of the development of oil field deposits, the filtration state of the productive geological environment in the bottom-hole zones and between wells is constantly changing. The process of hydrocarbon production itself - drilling wells, extracting oil from underground formations, injecting large volumes of a displacing agent cause strong disturbances of this state of the mountainous environment of the formations and its deviations from the natural state. Negative changes occur in time and in the processes of drilling wells, under the influence of drilling fluids and changes in stress fields during rock excavation, and in the processes of further operation when the permeability channels are contaminated with introduced mechanical, siliceous particles, paraffins, resins, and products of oxidative polymerization of oil.

In complicated development conditions, serious problems are associated with incomplete development of wells, when only the most permeable layers of the interbedded layer thickness or cracks in the carbonate formations are connected to the work.

To ensure sufficiently high rates of oil inflow at all stages of well operation, starting from their development after drilling, the formation medium is treated in their bottom-hole zones.

Cyclically alternating operations of repression on the formation with the injection of technological fluids into the formation and depression on the formation with the influx simultaneously with the wave action of elastic vibrations on the medium being treated allows the treatment of pore channels to be cleaned with the development of new filtering channels in the porous medium. However, during the treatment, cleaning of the PZP medium with a preferential cleaning of the most permeable channels and cracks, anisotropy of the filtration flows, and the departure of process fluids into unproductive zones of the formation can occur uneven in the revealed thickness and along the strike of the formation.

According to the invention, in order to ensure a new quality of processing when controlling the values and / or rates of repression and depression in the cycles from the beginning of treatment, their initial values are selected depending on the specific geological and physical conditions, and then, during subsequent cycles, a controlled increase is carried out in terms of amplitude and frequency parameters, a regular wave action and simultaneously periodically generate pressure shock pulses in the well fluid.

When limiting the pressure gradients and filtration rates with the appropriate cycle time and when controlling the amplitude-frequency parameters of the wave action, the annular region is uniformly saturated with the process fluid to achieve full coverage of the exposed formation thickness, since under these conditions simultaneously with the cleaning and cracking processes equalization of filtration rates in zones of different permeability. Under these conditions, simultaneously with the creation of hydroshock pressure pulses along the saturating fluid, a synergistic effect of a directed change in the structure of the fractured-porous reservoir medium and its permeability is achieved in a given annular zone around the well. Along with its saturation with the process fluid and the processes of increasing and depressurizing the pore channels throughout the entire thickness of the formation, additional cracking of the medium occurs, and the most effective cleaning of this annular region with the removal of mud and reaction products into the well is ensured.

Thus, in the annular region throughout the entire thickness of the reservoir, qualitatively new cleaning processes are initiated, permeability changes simultaneously with uniform saturation. In the next processing cycle, an increase in pressure gradients occurs, and since the introduction of the process fluid already occurs with an increase in the filtration radius, the filtration area quadratically increases and the above-described, qualitatively new processes of effective saturation and cracking are re-implemented.

As a result, sequential cleaning and favorable filtrational changes are made to the structure of the ring-shaped zones of the bottom-hole zone around the well, increasing with radius, with the extraction of liquid, gaseous and solid natural muds and reaction products from the fractures and pores of the rock structure of the formation with an increase in the filtration area and processing radius in each subsequent cycle. Achieved at the same time and high coverage of the reservoir in thickness and a significant depth of impact.

In the best case scenario, when adjusting the parameters of depression and repression cycles, recording and analysis of acoustic emission signals or electromagnetic emission signals coming from the formation are carried out, their fractal analysis in real time. This analysis allows you to continuously carry out informative and operational monitoring of the development of fracturing processes in the treated formation medium.

In this case, it is advisable, at least in one of the repression cycles, to pump compressible fluids into the treated formation medium at the same time as wave it and then to extract them when creating pulsed depressions, while using gas-liquid mixtures, oil-water emulsions, foams, and chemical reagents as compressible fluids. moreover, it is optimal to create compressible fluids directly during processing during the pumping of technological fluids into the reservoir, and as the gas introduced into the fluid, acce carbon dioxide, hydrocarbon gases, nitrogen, air, exhaust gases of internal combustion engines wellhead equipment or to use mixtures or gas generated by a chemical reaction with a reactant process fluid reservoir rock formation.

This allows for the operational regulation of the values and rates of repression and depression with a significant expansion of the range of variation of these parameters during the implementation of the method.

Also, in order to ensure the maximum result during the wave action, polyfrequency elastic vibrations are excited in the formation with a set of dominant frequencies in the range of 0.1-1800 Hz, which are determined on the basis of registration and analysis of seismic acoustic emission signals from the formation medium. At the same time, filtration processes, decolmation and crack formation are initiated at all basic levels of the structural hierarchy of the mountain environment and the transformation of the medium occurs with maximum intensity.

Since the claimed method is implemented during operation of the claimed equipment, a description of the operation and implementation of the method is given in the description of the downhole equipment.

The proposed equipment allows you to create cyclically alternating operations of repression on the reservoir in the wellbore fluid, while simultaneously with the regular wave action of the reservoir environment by elastic vibrations, hydrostatic pressure pulses are periodically generated at the reservoir interval in the wellbore fluid.

In addition, it allows, according to the method, to control and regulate the values of the speed and duration of repression and depression in cycles, as well as the parameters of creating hydroshock pulses from the beginning of processing, and it is possible to select and set all initial values depending on specific geological and physical conditions to , and then in subsequent cycles - with their sequential increase.

Advantages, as well as features of the present invention are illustrated by the best options for its implementation with reference to the accompanying drawings.

Figure 1 shows the working elements of the equipment in the piping system of the well and a longitudinal section of its underground part installed on the pipes lowered into the wells.

Figure 2 shows a longitudinal section of an optimal embodiment of a hydropercussion device.

Downhole equipment for the implementation of the claimed method of processing a reservoir (Fig. 1) consists of pipes, 1 jet pump, 2, a packer with an armature, 3, a hydropercussion device, 4, a hydrodynamic generator, 5 with a resonator transducer, lowered into the well on an elevator string; 6, equipped with a gas cavity - 7, and wellhead components. A central tube — 8 — was connected through the packer and hydropercussion device, connecting the supply line of the working fluid through the pipes — 1 to the hydrodynamic generator — 5. In the piping system of the wellhead with pump units, a line of working fluid exit from the annular space of the well — 9, a supply line — 10 connected to the descent pipe lift string - 1. On the output lines - 9 and power supply - 10, automated sensors for measuring and regulating the flow rate are installed - 11, 12, 13, 14, connected to the data collection and control station 15, with a computer yuter - 16.

The housing of the hydropercussion device - 4 (Fig. 2), mounted on the central tube - 8, includes an annular flow line for suction of the jet pump - 17. It has inlet channels - 18, central transfer channels - 19, lateral transfer channels 20 and dynamic locking elements : balls - 21 with saddles-bushings - 22, spring loaded with elastic elements - 23, placed in the cylinders 24.

The method is as follows.

At the well selected for processing, preliminary work is carried out to prepare for the impact on the reservoir, plan the territory for the placement of equipment, pumping units and laying communications. The technical condition of the well is checked, the geological and physical characteristics of the opened interval of the formation, its capacitive and filtration parameters, inflow profiles, intervals of water intake are checked, samples of the well production are taken, geophysical methods determine the injectivity of the productive formation and its dependence on the injection pressure, and update the latest current information on the mode of operation of the well and its design, if necessary, flush the well and additional perforation of the reservoir. They produce all the work required by the regulations, select and prepare the necessary working fluids and chemical agents, equip the wellhead with the required equipment, computer measuring and analytical complexes.

Using the elastic-reservoir parameters of the formation medium known or obtained through laboratory studies, the regime parameters of the vibrational displacement and acceleration are determined to effectively control the parameters of the microwave and shock pulses in order to clean porous PZP mediums of wells and the formation of microcracks in it.

An assembly from a jet pump - 2, a packer with an anchor - 3 with a central tube through a packer - 8 and through a hydroshock device - 4 installed on the pipe below it - 4 to the input of a hydrodynamic generator of elastic vibrations - 5 with a resonator is lowered into the well at the tubing - 1; -converter - 6, with the binding of its lower end to the level of the productive interval of the reservoir. The assembly is supplemented with the necessary measuring sensors and devices 11-15 with the cables passing through the pipes at the mouth to the computer systems - 16, if necessary, autonomous deep devices, for example, a depth gauge-thermometer, are installed. At the wellhead, the annular valves of the line for injecting the working fluid into the descent pipes and its outflow lines along the annulus of the well are equipped with automated regulators and flow and pressure meters - 11, 12, then the lines - 9 and - 10 are connected to the pump units, and flow pipelines are laid from them in technological containers with working fluid. If necessary, a special branch pipe with a gas ejector, with a gas line connected to a gas supply source, for example, to an exhaust gas exhaust system of standard pumping equipment, is inserted into the fluid supply line in the tubing - 10.

Using the available geological and field data for the well and the parameters of the wellhead equipment, using special computer programs, the necessary optimal geometric parameters of the working units of the downhole jet pump, hydrodynamic generator and wellhead ejector are determined and these nodes are set up when they are assembled before being launched into the well.

At the same time, to ensure coordination of the parameters of the excitation of the oscillation generator in the well system with the elastic parameters of the reservoir medium, taking into account the properties of the reservoir medium and the parameters of its hydraulic connection with the well, the mode gas pressures in the cavities of the hydrodynamic generator and the resonator transducer are calculated, the operating ranges for controlling the flow-pressure characteristics are determined fluid supply, ensuring the achievement of the required energy parameters of vibrational displacement and acceleration I'm in the given zones around the well. Appropriate preparation of the generator and resonator assemblies is carried out before being launched into the well.

Using the formulas Shchelkacheva V.N. [Shchelkachev V.N., Lapuk B.B. Underground hydraulics. Moscow-Leningrad: Gostoptekhizdat, 1949, 525 pp.] Based on the available data on the density and compressibility of the process fluid, the depth of the formation, porosity, permeability, and piezoconductivity of the formation medium, a computer calculation of the mode of creating a bottomhole pressure drop is achieved to achieve a minimum impact radius as applied to setting the period of time of repression on the reservoir in the initial cycle of well treatment.

Then, with the inclusion of pumping units, the process fluid is pumped into the tubing along line - 10. The initial cycle of the introduction of the process fluid into the formation is carried out. Technological fluid coming from the wellhead, flowing through the central tube of the packer - 8 to the hydrodynamic generator - 5, is introduced through the perforation channels into the formation. The set initial level of repression in this case, according to the calculated data, is created through a computer - 16 and a control station for automatic regulation of flow and pressure - 15 on the regulation sensors - 11-13 on the injection line 10 and flow line - 9. At the same time, a certain (large enough) part of the fluid flow, passing through a generator with a resonator-transducer - 6, enters the input of the device to create hydroshock pressure pulses - 4 and then through the displacement chamber of the jet pump - 2 along the annulus at the wellhead other.

On the interval of the formation in the borehole fluid, regular fluctuations in flow rate and pressure are generated with the effective transfer of wave energy to the formation medium.

When the flow rate of the fluid through the hydropercussion device - 4 (figure 2) with a certain increase in flow rate through the annular flow line - 17 occurs when balls 21 enter the saddle sleeves - 22 intermittent locking in the channels - 19 of the fluid flowing through the inlet channels - 18 , with the formation of reverse water hammer in the annular volume of the liquid under the packer. Then, when the saddle sleeves - 22 are moved in the direction of compression of the springs -23, the lateral transfer channels - 20 are opened, the pressure in the channels is equalized, and under the action of the springs - 23 the saddle-sleeves discard the balls - 21 to their original position. These processes are periodically repeated; hydroshock pulses entering the reservoir medium are created.

Filtrational introduction of the process fluid occurs with cracking of the medium over the entire exposed interval of the formation. After the time period for creating repression expires, at the command of the measuring and analytical computer complex - 15, 16, the operating mode is changed - the necessary change in the flow-discharge parameters in the discharge lines - 10 and outflow - 9, which ensures the inclusion of the jet pump - 2 and the mode specified repression is replaced by a regime of creating depression per layer. In this case, a reverse fluid flow to the well from the formation medium occurs. Perforation channels and cracks are cleaned over the entire interval of the formation. The fluid flowing out of the formation enters the receiving holes - 18 of the hydroshock device - 4 and then through the packer - 3 to the mixing chamber of the jet pump - 2, where, mixing with the nozzle fluid, it acquires the necessary pressure to rise at the wellhead into the flow line - 9. Possibility regulating the flow through the central tube - 8, passing to the hydrodynamic generator through the packer - 3, allows the creation of an adjustable depression also allows the functioning of the hydrodynamic generator - 5 and hydropercussion device - 4 in working mode. The quality of the filtration transformation of the medium sharply increases.

Monitoring of the development of filtration processes and cracking in the reservoir medium is carried out, according to the signals from the sensors, their computer processing in the feedback mode is set and the repression and depression modes are similarly carried out in subsequent cycles of the method, and such a mode of creating repression and injection is always selected that downhole the pressure at its increase reaches a certain local value, determined by the current filtration properties of the reservoir.

In this case, with a change in the current filtration characteristics and the elastic capacity of the formation medium near the well, the program-control complex constantly adjusts the range of regulation of the pressure-flow rate characteristics of the fluid flow along the injection lines - 10 and outflow - 9 with the implementation of signal control through automated sensors - 11, 12, 13 at the mouth.

When the inflow is called, when the jet pump - 2 is turned on, the introduced process fluid is extracted with an increased output of contaminants from the BCP and is carried out at the wellhead into the gutters. After each treatment cycle, the injectivity of the well is evaluated. Processing stops when design targets are reached or when stabilization of injectivity changes is achieved during processing cycles.

An example of the method

To carry out the operations of the method for processing the bottomhole formation PZP, a production well was selected that opens in the depth interval 1597.0-1609.0 m D3_fm formation, represented by productive finely fractured porous-cavernous differences occurring among dense crystalline limestones of the Famennian stage, 10% porosity, average permeability - 0.02 μm 2 . The current slaughter is 1592.0 m. The current flow rate is 2.3 m 3 / day, the water cut is 22.5%, the dynamic level is 1145 m, and the reservoir pressure is 13.7 MPa. The density of reservoir oil is 911 kg / m 3 , the gas factor is 13 m 3 / t. The modulus of comprehensive compression is E · 10 -4 = 4.263 MPa, the Poisson's ratio σ = 0.26.

The well was cased with a production string of 146 mm with a wall thickness of 7.75 mm.

After carrying out preparatory work, washing, beating the face, and patterning the string, the assembly with the equipment of the technological complex NPP OIL-ENGINEERING was lowered on a string of tubing 73 mm (2.5 ") in diameter — in series: a nozzle with a deep manometer-thermometer, unit with a hydrodynamic generator of vibrations GD2V-20 with a resonator-transducer in which the gas cavity is filled with nitrogen, a unit with a hydropercussion device, a packer unit (packer PRO-YamO-YaG + 1 tubing tubing). and at the end of the collar locator installed converter cavity at a depth of 1603 m.

Tied the wellhead with two pumping units SIN-31.

Changed the volume of fluid in the well to oil.

The NPP OIL-ENGINEERING measuring and analytical complex was connected to the well string to record recording and analysis of wellhead pressures and flows in the discharge and discharge lines (strain gauges LH-412, LH-417, Sova-3T flow meter), bottomhole pressure and temperature (KSA) A / 7), as well as acoustic signals from the formation along the casing, represented by LX-410 strain gauges, KSA A / 7 sensor, piezoelectric transducers of the type DN-3-M1 and DN-4-M1 and AR48, VShV-003-M3 and LTE22, signal pre-amplifiers, analog-to-digital convert Lemma (ADC) E-330, computer-based Intel Pentium-M processor, equipped with special software. Automated flow control sensors ASCO, KPT (15kch 892p1M) were installed on wellhead valves.

The implementation of the method begins to initiate the development in the formation medium of internal cleaning processes, softening the structure of the porous medium and crack formation over the full volume of the formation.

For this, simultaneously with the repression and depression of bottomhole pressure, it is advisable to create elastic vibrations in the medium with a frequency-energy regime, which is determined by the task of vibrational acceleration

Figure 00000001
and vibrational displacement ξ.

In this case, the operational parameters of the vibrational acceleration and displacement to achieve the effects of exposure according to the method of the inventors are evaluated as:

Figure 00000002
and
Figure 00000003
g is the value of the acceleration of gravity,
Figure 00000004
- the characteristic diameter of the pore channels of the medium, which is estimated by the coefficients of permeability k and porosity m using the formulas of F. I. Kotyakhov:

Figure 00000005

Here, the value of the permeability coefficient k in units of μm 2 is substituted.

In this case, the frequency range of the vibrational action necessary for the implementation of the method is determined according to the methodology of the authors according to the relations of vibrational acceleration and displacement

Figure 00000006
from the condition of minimum oscillation intensity as (80 ÷ 350) Hz.

Using known data on the properties of the working fluid, the porous medium of the reservoir used to fill the cavities of the generator and the gas resonator, taking into account the obtained frequency range of the oscillatory action, the gas pressure in the gas cavities of the resonator-transducer is calculated using the MODE-auto-S computer program and hydrodynamic generator, which is equal to 2.5 MPa. The estimated range of regulation of the flow rate and pressure of the working fluid injection at the mouth (9.0-15.0) dm 3 / s, including for the flow through the generator - (2.2-4.0) dm 3 / s and differential pressure - (11 , 0-20.0) MPa; differential pressure across the generator (11.0-20.0) MPa. These data were taken into account when preparing equipment before launching when filling cavities with working gas, and they are also used by the program-control complex in the process of automated control of the method implementation mode.

The implementation of the first processing cycle begins. First, the working fluid - water was pumped through the pipes in the circulation mode through the trough with a flow rate of 9-12 dm 3 / s at a pressure of 9-12 MPa for 20-40 minutes, then a repression cycle was performed on the formation with corresponding flow control at the wellhead sensor spout lines with water injection into the reservoir for 5-10 minutes, followed by opening the annulus for spout and turning on the fluid pumping in a circular circulation with a flow rate of 9-15 dm 3 / s for 10-20 minutes. Download cycles - spout repeated. At the same time, changes in the state of the formation medium were monitored by recording AE signals from the formation at discrete time instants with the operation of the computer of the measuring and analytical complex.

Figure 3 presents diagrams of bottomhole pressure and temperature, and figure 4 is a diagram of noise metering obtained by the software-control complex at the stages of the method.

At one stage, two acid aggregates were connected to the wellhead through a mixer for parallel operation. The receiving hoses of the pumping units were installed in a technological capacity of 30 m 3 filled with oil. From the annular valve, a flow line was laid in the technological tank. We performed the injection and injection into the reservoir of successively hydrochloric acid (24-28%) and oil acid emulsion (50%). We pumped into the reservoir 2 m 3 hydrochloric acid + 2 m 3 oil acid emulsion. 8 m 3 of oil acid emulsion, 1 m 3 of hydrochloric acid, 6 m 3 of oil acid emulsion, 1 m 3 of hydrochloric acid were injected into the reservoir sequentially. Then they squeezed 13 m 3 of oil into the reservoir.

Completed work on the extraction of downhole equipment and putting the well into operation. Conducted geophysical exploration. Figure 5 presents the results of well debitometry obtained before and after the implementation of the method.

Using the proposed invention can significantly increase the efficiency and profitability of well treatments by optimizing the sequence of operations during the process, improving the quality of cleaning operations, more complete softening and cracking of the mountain environment, reducing energy and labor costs, the timing of putting wells into operation, and increasing the overhaul period wells, optimizing the costs of chemicals, increasing productivity and working conditions.

Claims (9)

1. A method of treating a productive formation, including cyclically alternating operations of repression on the reservoir with the injection of technological fluids into the reservoir and depression on the reservoir with an inflow, the wave action of elastic vibrations on the medium being treated by a hydrodynamic generator installed in the well opposite the production interval, controlling the value and / or the speed of repression and depression in cycles, the regular wave action controlled by the amplitude-frequency parameters, and the implementation monitoring development of filtration processes in the reservoir medium, decolmation and crack formation, based on which control parameters are determined and assigned in the feedback mode, wave action parameters in subsequent cycles of repression and depression and the duration of these cycles in time, characterized in that the magnitude and / or speed the creation of repression and depression in the cycles is regulated with their sequential increase, while their initial minimum values are determined and assigned depending on the filtration - capacitive parameters of the reservoir environment and at the same time periodically create hydroshock pressure pulses in the borehole fluid.
2. The method according to claim 1, characterized in that when adjusting the parameters of the depression and repression cycles, they record and analyze acoustic emission signals or electromagnetic emission signals from the formation, and analyze them in real-time fractal analysis.
3. The method according to claim 1, characterized in that at the beginning of the implementation of the method, as well as periodically during the cycles of repression and depression, hydrodynamic testing of the bottom-hole zone of the formation is carried out, the results of which are taken into account when monitoring the development of filtration processes in the formation medium, decolmatization and crack formation.
4. The method according to claim 1, characterized in that, at least in one of the repression cycles, simultaneously with the wave action, compressible fluids are pumped into the treated formation medium, followed by their extraction when creating pulsed depressions, while compressible fluids are used gas-liquid mixtures, water-oil emulsions, foams, chemicals.
5. The method according to claim 4, characterized in that the compressible fluids are created directly during processing during the injection of process fluids into the reservoir, while carbon dioxide, hydrocarbon gases, nitrogen, air, exhaust gases of internal engines are used as the gas introduced into the liquid. combustion of wellhead equipment or mixtures thereof or use gas resulting from a chemical reaction of a reagent process fluid with formation reservoir rocks.
6. The method according to claim 1, characterized in that when controlling the amplitude-frequency parameters of the wave action, polyfrequency elastic vibrations are excited in the formation with a set of dominant frequencies in the range of 0.1-1800 Hz, while during processing the signals of seismic acoustic emission from the formation are recorded environment, and the dominant frequencies of the polyfrequency exposure are determined based on the analysis of the signals of these emissions.
7. Downhole equipment for processing the bottom-hole zone of the formation, including a jet pump mounted on a packer on a pipe string, a resonator transducer in communication with the output of a hydrodynamic flow oscillation generator and made in the form of a pipe, the resonator transducer being installed at the lower end at the level of the perforation interval, and the hydrodynamic generator is located below the packer and is hydraulically connected to the discharge line through the transfer channel of the packer, characterized in that it is equipped with a hydraulic shock device, complements as mounted on the casing pipe string with the inlet channels, which are arranged inside the axially movable cylinder with the central downcomers provided with locking elements.
8. Downhole equipment according to claim 7, characterized in that the shut-off elements are made in the form of balls with seats, and the cylinders are provided with central transfer channels and side transfer channels.
9. Downhole equipment according to claim 7, characterized in that the cylinders are provided with transfer channels of different cross-sectional areas.
RU2010120080/03A 2010-05-19 2010-05-19 Treatment method of productive formation, and downhole equipment for its implementation RU2478778C2 (en)

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CN201180035307.XA CN103140649B (en) 2010-05-19 2011-03-25 Oil-producing formation processing method and for implementing the oil well rig of the method

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RU2704069C2 (en) * 2017-02-16 2019-10-23 Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования "Дагестанский Государственный Технический Университет" (Дгту) Well bottomhole zone vibro-wave treatment method
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