The method of acoustic impact on the well system of reservoir pressure maintenance

 

(57) Abstract:

The invention relates to the oil industry and, in particular, to methods for development of oil fields with maintaining reservoir pressure (PAP) method of waterflooding. Carry out a preliminary cleaning washing the bottom of a well refined surfactant with water to clean the well fluid. Determine the injectivity profile. In the near-wellbore zone pump current number of active process fluid based on water-soluble surfactant is forced into the reservoir. Down in the perforation zone of the ultrasonic emitter. Carry out the dispersion of mudding through action on the near-well zone of the reservoir field of ultrasonic frequency in the active environment of process fluid. The influence of the field of elastic vibrations carry out the steps in top-down or bottom-up in increments of one meter and the exposure time in step from 0.5 to 2.0 hours, depending on loss of injection capacity of the well of the project size. Pump the calculated amount of acid. The displacement of the acid into the formation carry out triple in relation to acid volume of water. Degradation products forced into the reservoir. After dissolving the acid dispersed colunas the process liquid is carried out at lowered to the bottom tubing (tubing) and do not retrieve. Before the definition of injectivity profile and descending into the perforations of the ultrasonic emitter exercise pripode tubing above the roof of the reservoir. Improving the quality of repair of wells of the reservoir pressure maintenance system. 1 C.p. f-crystals.

The invention relates to the oil industry and, in particular, to methods for development of oil fields with maintaining reservoir pressure (PAP) method of waterflooding. These methods are aimed at improving the final oil recovery, as a rule, through redistribution of hydrodynamic flows in heterogeneous permeability formations. The problem is solved by limiting water production in well-drained and rinsed with water interlayers install injecting into the reservoir through the well system to maintain reservoir pressure maintenance (rpm) flow deflection screens, hydrophobic filters in operating the wells of various chemical and physical composition of agents. Such work is carried out to prevent water breakthrough in production wells from wells TTD and reduce the water content of the produced fluid (increasing the efficiency of water injection wells. Survey information. VNIIEM, a series of "Petroleum engineering", M., 1982, No. 22tx2">Modern methods of enhanced oil recovery and new technologies in the fields of the Russian Federation. Oil industry, No. 10, 1993, S. 6-15). The application of the described technology allows to solve tasks such as the restriction of water in producing wells from specific wells of the reservoir pressure maintenance system, raising or lowering the pickup wells TTD, balancing their profile pick to displace oil from poorly drained layers of the reservoir, the cleaning of the bottom-hole formation zone (PPP) production wells from clogging deposits of different nature and chemical composition for increasing the inflow of fluid.

In the practice of oil production at the fields, there are cases when the rpm system used stratiform, wastewater or produced water that has not passed a sufficient degree of purification, and the problem of clogging of the PPP injection wells, mechanical impurities, residual organic emulsions of oil and products of corrosion of piping contained in the injected water. This causes a sharp decline in water injection up to a complete loss of water injection wells in the reservoir pressure maintenance system that has an adverse impact on the dynamics of the reservoir pressure (it falls) and the production zone of the formation (PPP) wells sometimes reaches such a level, what different types of traditional acid treatment during workover (acid bath, acid drainage, hydrocyclones kick), thermal and thermochemical processing, injection laundering solutions of surface-active substances (surfactants), and even re-perforation (usually perestrelo) operating casing does not lead to the recovery of the filtration properties of bottom-hole formation zone (PPP) wells TTD.

One way of increasing the injectivity of the wells of the reservoir pressure maintenance system is a well-known method of acoustic impact on the PPP of these wells in the active environment of process fluids. This way of development of oil fields (EN 2136859 C1) is used as a prototype. The aim of the invention, taken for the prototype was improved method of developing oil fields while reducing costs and improving the environmental credentials of the way by using to create in high-permeability areas and cracks bottomhole producing wells hydrophobic barrier with a small phase permeability to water and high for oil, and the alignment of the profile of water injection wells in the reservoir pressure maintenance system by setting the flow deflection of the screen. DL is affected sediments.

However, at the moment, not the cost of repair of wells plays a crucial role, and the quality of work performed, i.e., achieving the maximum possible repair period (MRP). Applying the method, taken as a prototype, it is possible to increase the injectivity of the wells of the reservoir pressure maintenance system and (or) align their injectivity profile.

However, achieving the goal (increased throttle response) by using this method, the effect is transient, i.e., from several days to several weeks. This is because the outside of it with the injected water clogging particles of different nature and composition of the wells are not removed, do not dissolve, and mechanically in an ultrasonic field are crushed and pressed injected water in more remote from the well zone of the reservoir. Thus, during a process run well PPD injection after acoustic stimulation during the overhaul, the injection capacity of the well increases. When the penetration in the far zone of the reservoir crushed clogging particles and their deposition pickup drops, and the injectivity profile of the well TTD is aligned as a result of redistribution of the volume of the injected water is achieved, and the increase in pick-up only partially, which is a disadvantage of this method.

Also the disadvantage of the method, taken as a prototype, is ignoring, for the sake of cheaper technology, work related to preliminary cleaning of the wellbore from TTD introduced with the injected water and partially settled in the wellbore contaminants by washing the bottom of the wells of water, refined various surfactants to clean the well fluid.

All organic and inorganic clogging deposits according to the method prototype is dispersed (crushed) is forced into the reservoir to create a hydrophobic filter which acts as limiter water enters the production well or flow-deflecting screen in the wells of the reservoir pressure maintenance system. However, not in all cases well workovers TTD require the installation of flow screens, i.e., the decrease permeability of well drained and washed the interlayers. As a rule, requires the inclusion of poorly drained and kolmat interlayers.

Also the disadvantage of the prototype is the determination of the optimum parameters of ultrasonic treatment on the PPP on the basis of preliminary laboratory ispytatb in one way or another process fluid, providing a dispersion with a particle size of the solid phase in the range of 0.5-20 μm - item 5, column 7 of the patent-prototype. The implementation of this paragraph in field conditions, in practice, extremely difficult or impossible. Determination of the optimal frequency effects on clogging material is possible only in laboratory conditions. When providing acoustic impact on the PPP of the well through the perforations of the casing of the well and sufficiently low radiation powers (from 0.7 to 1.5 kW) acoustic impact is not on the rock (matrix) formation, as suggested by the authors of the prototype, and the borehole fluid. Liquid waves are transmitted through the pore space of the reservoir, providing a wave effect on the deposits on the walls of the capillaries. Thus, it is enough to achieve frequency ultrasound in a narrow frequency range (e.g., 18-24 kHz) when the effect of cavitation, as in the pore space filled with an active process fluid (ATGET) based on water-soluble surfactant, the effect of wave "washing machine" (Ultrasonic technology. - M.: metallurgy, 1974, S. 285-293, Ultrasonic technique, vol.2, 1963, S. 52-57).

This effei the intensity emitted in the downhole fluid energy its frequency, porosity, permeability and absolute permeability of the rock.

Acoustic technology have a fairly clear line application on the specified physical parameters of the layers.

Therefore, before applying the method ABC necessary to analyze the physical characteristics of the productive layers of the wells (data are available in commercial matters wells) to eliminate useless work and increase the success of its application.

One of the most important areas of well workover (red) rpm system is to increase injectivity poorly drained interlayers and restore lost throttle response with the aim of increasing the ratio of oil displacement. Taken as a prototype method (EN 2136859 C1) allows to partially solve the problem, however, is ineffective in the repair of wells in the reservoir pressure maintenance system in the complete loss of their pickup.

The purpose of this invention is the improvement of the way of the development of oil fields with maintaining reservoir pressure method of flooding by better repair of wells of the reservoir pressure maintenance system, in terms of the achievement and (or) increase in intake capacity leveling profile pick at the well is a query result is achieved in the process of implementation of the method according to the following scheme:

1. Analysis of physical parameters of the reservoir.

2. Propusk tubing (tubing) to the bottom of a well.

3. Flushing the borehole ennobled 0.1 to 0.2% surfactant (type ML-81B, neonols AF9-12and others) with water to clean the well fluid.

4. Pripode tubing above the "roof" layer at 20-30 meters

5. The descent into the well logging tool and geophysical surveys wells (GIS) to determine the profile of water injection wells and bindings handpiece cable geophysical (KG) to a specific perforation interval.

6. Rise from the well to the surface of the logging tool.

7. Propusk tubing to the "sole" of the layer.

8. Injection and displacement in the reservoir calculated quantity of water-soluble 1-5% solution of surfactant remaining in the wellbore at least 25% of the surfactant solution or leaving the ATGET in the form of baths if no pickup.

9. Secondary pripode the tubing string above the "roof" layer is not less than 20-30 meters

10. The descent into the perforations of the ultrasonic emitter on the logging cable and carrying out the steps of the acoustic disturbance in the frequency range of 18-24 kHz on the area of the punch is 0.5 to 2.0 hours, depending on the extent of the loss of capacity of the well from the design value.

11. Ascent to the surface acoustic emitter.

12. Propusk tubing to the "sole" of the layer.

13. Discharge estimated number of 12%, the corresponding maternal breed productive formation acid, and its displacement into the reservoir triple to acid volume of water.

14. Dissolution of the acid dispersed by ultrasound clogging deposits within 4 hours.

15. Start well under the water injection.

In this technological scheme there are no time-consuming full tripping operations (SPO) pull the tubing from the well, which, in turn, leads to decrease the time and cost of repair of the well. Scheme of implementation of the method, including standard operations workover, has the form ATGET + ABC + Acid, and is unique among the known prototypes (patent RU 2094594 C1, EN 2015874 C1, EN 2055979 C1, EN 2151273 C1).

1. The method of acoustic impact on the well system of reservoir pressure maintenance, including the injection wells estimated number of active process fluid based on water-soluble surface-active substances (surfactants) when lowered to the ONU of the reservoir field of ultrasonic frequency in the active environment of process fluid based on water-soluble surfactant lowered into the perforations of the ultrasonic emitter and the subsequent displacement with the degradation products in the reservoir, and start well under the water injection, characterized in that prior to injection into the well estimated number of active process fluid based on water-soluble surfactants carry out a preliminary cleaning by flushing of the face ennobled surfactant with water to clean the well fluid, determine the injectivity profile, after discharge estimated number of active process fluid based on water-soluble surfactants its push into the reservoir, while impacts on the near-well zone of the reservoir field of elastic oscillations of ultrasonic frequency is carried out in the environment of the active process fluid based on water-soluble surfactant ultrasonic emitter steps in top-down or bottom-up in increments of one meter and the exposure time in step from 0.5 to 2.0 hours, depending on loss of injection capacity of the well from the design value, then pump the calculated amount of acid, and the displacement of the acid into the formation carry out triple in relation to acid volume of water, then after dissolving the acid dispersed clogging deposits shall start well under the water injection, when this tubing from the well without removing the surface, and before the definition of the profile receiving the active layer.

2. The method according to p. 1, characterized in that in the absence of injectivity of the reservoir, the injected active process liquid is brought by tubing to a reservoir and left in the well bore in the form of a bath.



 

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