Local hydraulic reservoir fracturing method

FIELD: oil production, particularly methods for stimulating oil production.

SUBSTANCE: method involves performing deep perforation through all intervals of formation to be treated; assembling sectional charge with central channel for tool set passage; lowering charge into well and combusting sections thereof formed of compositions providing charge burning in aqueous, oil-and-water and acid medium to form combustion products; increasing pressure and temperature inside the well; performing control of charge section burning in real time mode during fast combustion thereof; recording behavior characteristics of the charge and estimating the pattern of action exerted on the formation and bottomhole formation zone response to the action. Composite rod formed of material providing rod integrity during mechanical and heat load application during charge lowering/lifting and combustion process is used for charge assemblage. Composite rod has inner channel extending along central axis thereof adapted for passing power lead of ignition unit and wire with heat-resistant insulation connecting borehole cable with electronic unit adapted for controlling and recording behavior characteristics of the charge. Electronic unit is connected with lower part of lower rod and spaced a distance from charge sections. The distance is selected to prevent direct action of charge combustion products on the electronic unit. Besides, gas flow distributor is arranged between lower charge section and electronic unit to provide maximal directed action onto formation to be treated. Inner charge cavity is filled with surfactant for the full structure height to provide additional differential pressure drawdown and mechanical impurities removal as a result of surfactant foaming during charge burning. Perforation is performed through all formation intervals by means of perforator with 30-45° phasing so that vertically inclined spiral cracks around well bore in bottomhole zone are formed after charge combustion. The cracks are restricted from closing during following hydraulic fracturing and provide hydrodynamic communication between well and formation. For charge assemblage upper and lower rods connected to both ends of load-bearing rod part are used, wherein upper rod is lengthen up to 2.0-2.5 m, lower one is extended up to 1.0-1.5 m.

EFFECT: reduced accident risk, decreased thermal impact action on borehole cable, possibility of well normal operation after treatment thereof due to prevention of pump clogging with mechanical impurities and pyrobitumens during well operation starting and increased perfection of reservoir drilling-in.

2 dwg

 

The invention relates to means for extraction of oil.

The known method gothicrainbow stimulation, including deep-perforation on all intervals of the processed layer, the die Assembly sectional charge by passing details of the snap-in for the collection of partitions of charge through the Central channel of each section of the charge and pulling them close to each other in other parts of the snap, the descent of the charge in the well and the burning of his sections made from compounds, which provides burning in water, water-oil and acid environment by running node ignition and subsequent combustion of one or more igniter sections of charge and main sections with the formation of the products of combustion, pressure and temperature [1]. In the igniter section charge the diameter of the channel is larger than in the main sections. As the recovery partition of charge use of the supporting pipe with pyrotechnic igniters, in the upper part of the sealed cable head, to which is attached geophysical cable mounted on it two main sections of the charge from the upper tip and the lower part sealed by a plug attached to a cable, which is closely put on the three main sections of the charge. Put the device in the hole and the mouth of avleat it above the perforated interval of 2-4 m Set fire to trigger the explosives that blow the wall of the pipe, and ignite the igniter section of the charge, and from it the main section of the charge. The combustion of the charge occurs from the channel. The side surface charge has a protective coating, preventing the charge from friction and shock of the column.

The application of this method does not always produce a positive effect. This is due to the fact that the charges collected on the logging cable in the junction charges when combustion is overheating and rupture of the wireline, the section of the battery is disconnected, which can lead to emergency situations.

Installation charge in the borehole above the perforated interval leads to the fact that the treated part of the impact pressure of the well fluid, which is transferred to the energy of the gas.

As the closest analogue (prototype) to the claimed invention adopted the method gothicrainbow stimulation [2], including deep-perforation on all intervals of the processed layer, the die Assembly sectional charge with a Central channel through which pass the details of the snap, the descent of the charge in the well and the burning of his sections made from compounds, which provides burning in water, water-oil and acid environment with formation of gaseous products of combustion, the pressure increase and the temperature, control of combustion sections of charge in real time with fast combustion processes, the registration features of the operating mode of the charge, the nature of their changes are judged on the nature of the stimulation and the response of the bottomhole zone on impact, while for the Assembly of the battery using the composite rod made of material so as to maintain integrity when exposed to mechanical and thermal loads during the descent-ascent of charge and combustion, with a hollow channel, passing inside the rod along its Central axis for the passage of wires power supply node ignition and wires with heat-resistant insulation, connecting the wireline to the electronic control unit and registration characteristics operation mode of the charge, which is attached to the lower end of the rod and come from sections of the charge at such a distance that the hot gaseous products of combustion of the charge had no direct impact on it, at the same time to reduce the load on the rod and provide maximum directional effect on the treated layer between the lower section of the charge and the electronic unit has a diffuser of a gas stream, perform fracturing by conducting several sequential stimulation Assembly and the shutter charge and the burning of his clubs is in the same interval of the reservoir and the rise of wells with snap attached to it by electronics monitoring and recording characteristics of the operation mode of the charge, many sections of the charge when the first combustion is chosen such as to provide in the range of processed reservoir pressure exceeds the tensile strength of rocks composing the layer, to create in the formation of cracks and ensure reliable hydrodynamic links well with the reservoir, control of combustion sections of charge in real time, and then raise the snap-in of wells, registered on the curve characteristics of the mode of operation of the charge judge the reaction of the bottomhole zone on impact, determine the mass of the charge for subsequent exposure to provide in the range of processed reservoir pressure is sufficient for the development and deepening of cracks formed in the first combustion sections charge and create cavities inside the layer, change the length of the composite rod, carry out the subsequent impact on the formation and nature of changes in the registered curves during the combustion sections of the charge and changes in them during the first and subsequent combustions are judged on the nature of the stimulation and the response of the bottomhole zone on impact.

The disadvantages of this method are: high accident rate due to temperatures on the logging cable, the inability o wells after processing in the normal mode of operation due to mechanical impurities, asphaltenes, which C is bivaet the pump at start-up of wells, in General, complicates the development of wells, especially for carbonate rocks.

The invention aims to reduce road accidents, reducing the impact of temperatures on the logging cable, providing output well in normal mode after processing by preventing clogging of the pump mechanical impurities, asphaltenes at start-up of wells and increasing the efficiency of drilling.

This task is solved in that in the method the local hydraulic fracturing, including deep-perforation on all intervals of the processed layer, Assembly, sectional charge with a Central channel through which pass the details of the snap, the descent of the charge in the well and the burning of his sections made from compounds, which provides burning in water, water-oil and acid environment with formation of combustion products, the increase of pressure and temperature, control of combustion sections of charge in real time with fast combustion processes, the registration features of the operating mode of the charge, the nature of the changes which are judged on the nature of stimulation and reaction the bottom zone on impact, to build a battery using the composite rod made of material so as to maintain integrity when exposed fur the technical and thermal loads during the descent-ascent of charge and combustion, the hollow channel, passing inside the rod along its Central axis for the passage of wires power supply node vosplamenyat and wires with heat-resistant insulation, connecting the wireline to the electronic control unit and reception characteristics of the operation mode of the charge, which is attached to the lower part of the lower rod and come from sections of the charge at this distance, so that hot products of combustion of the charge had no direct impact on it, in addition, to reduce the load on the rod and provide maximum directional effect on the treated layer between the lower section of the charge and the electronic unit has a diffuser of a gas stream, according to the invention the inner cavity of charge the full height of the construction fill of the surface-active substance to provide additional depression on the formation and removal of mechanical impurities in the foaming surface-active substances during combustion of the charge, the perforation on all intervals of the processed layer is carried out by the perforator with the phasing 30-40° education after combustion of the charge vertically-inclined spiral fractures around the borehole in the critical zone, which is not closed during subsequent fracturing and provide the hydrodynamic coupling of the well with the reservoir, when assembling the charge for the wounded structural integrity and reduce the impact of temperatures on the logging cable at the combustion charge use long-2.0-2.5 m top and elongated to 1.0-1.5 m lower rod, attached to both ends of the bearing portion of the rod.

Figure 1 shows a device for implementing the method. Figure 2 - a section a-a figure 1.

The device includes a host of ignition 1, the igniter section of the charge 2, the main section of the battery 3, the groove for establishing node ignition 4 and the composite rod 5, containing the carrier portion of the rod 6, the upper and lower rods 7, 8, diffuser gas flow 9, the compensator of linear expansion of the sections of the battery 10, the logging cable 11, the electronic control unit and reception characteristics of the mode of operation of the charge 12, the upper and lower centralizers 13, the wire supply node 14 ignition wire with heat-resistant insulation 15 connecting the wireline to the electronic control unit and reception characteristics of the operation mode of the charge, the internal cavity to fill surfactant 16, a gasket of elastic material, such as paramita 17.

The method is as follows.

Conduct deep perforations on all intervals of the processed layer of the perforator with the phasing 30-45° education after combustion of the charge vertically inclined spiral fractures around the borehole in the critical zone, which is not closed during subsequent fracturing and provide the hydrodynamic coupling of the well layer, and then perform a gap place is and, why spend several sequential stimulation Assembly and the descent of the charge node ignition 1, the inner cavity of which the entire height of the structure is poured surface-active substance (SAS) to provide additional depression on the formation and removal of mechanical impurities in the foaming surfactant during combustion of the charge. For Assembly of the battery using the composite rod 5, consisting of elongated up to 2.0-2.5 m of the upper rod, the elongated up to 1.0-1.5 m lower rods and the carrier rod 6. The use of elongated upper and lower rods will ensure the preservation of the structural integrity and reduce termoustoychivee on the layer. The use of composite rod allows you to collect the charge from the different number of sections and to simplify the delivery rod on the hole, burning sections of the charge 2, 3 in the same interval of the formation and rise of the wells with snap attached to it by the electronic control unit and reception characteristics of the operation mode of the charge, the number of sections in the first combustion depending on the depth and capacity of the reservoir is selected such as to provide in the range of processed reservoir pressure exceeds the tensile strength of rocks, forming a reservoir for the implementation of the undermining of the formation and creation of cracks, providing a reliable hydrodynamic connection wells the reservoir, control of combustion sections of charge in real time, and then raise the snap-in of wells, registered on the curve characteristics of the mode of operation of the charge judge the reaction of the bottomhole zone on impact, determine the number of sections for further action, which provides in the range of processed reservoir pressure is sufficient for the development and deepening of cracks formed in the first combustion sections of the charge, and the creation of voids within the layer, and then perform the subsequent impact on the formation and nature of changes in the registered curves during the combustion of the charge and changes in them during the first and subsequent combustions are judged on the nature of the stimulation and about the reaction of the bottom hole zone of influence.

Thus, the proposed method allows the gas-dynamic impact with fracturing, without compromising the integrity of the casing. The use of surfactants in the composition of its sections explosive charge creates more depression on the formation and removal together with foam surfactant formed by the combustion of the powder charge, residue solids, asphaltenes, resin and paraffin deposits, which prevents driving the pump at start-up of wells and provides the output well after treatment on normal mode and control the delight of its development, especially for carbonate reservoirs. Thus, treatment of perforating holes from clogging elements allows to increase compared with the prototype of perfection drilling, and the use of elongated upper and lower rod will reduce the accident rate by reducing the impact of temperatures on the logging cable.

The application of this method is recommended for fields with a tendency toward clogging of the near-well zone of the productive reservoir with asphaltene-resinous and waxy deposits and is particularly effective in the oil fields with a high content of products of asphaltenes, resins (about 10%) and relatively low temperature reservoirs.

Bibliography

1. Adjustment-explosive equipment. Guide /L.Y. Fridlyander, VA

Afanasiev, Lisaraye and other edited Leafroller. 2nd ed. Rev. and supplementary M.: Nedra, 1990, Section 4.1. Powder pressure generator, S. 109-112.

2. RF patent №2183741, E 21 In 43/263 (prototype).

The way the local hydraulic fracturing, including deep-perforation on all intervals of the processed layer, Assembly, sectional charge with a Central channel through which pass the details of the snap, the descent of the charge in the well and the burning of his sections made from the of Ostapov, providing burning in water, water-oil and acid environment with formation of gaseous products of combustion, increasing pressure and temperature, control of combustion sections of charge in real time with fast combustion processes, registration of characteristics of the operation mode of the charge, the nature of the changes which are judged on the nature of the stimulation and the response of the bottomhole zone on impact, while for the Assembly of the battery using the composite rod made of material so as to maintain integrity when exposed to mechanical and thermal loads during the descent-ascent of charge and combustion, with a hollow channel, passing inside the rod along its Central axis to pass the supply wires of the node ignition and wires with heat-resistant insulation, connecting the wireline to the electronic control unit and reception characteristics of the mode of operation of the powder charge, which is attached to the bottom of the rod and come from sections of the charge at this distance, so that hot products of combustion of the charge had no direct impact on it, in addition, to reduce the load on the rod and provide maximum directional effect on the treated layer between the lower section of the charge and electric unit features a gas diffuser p the current characterized in that the inner cavity of charge to the entire height of the construction fill of the surface-active substance to provide additional depression on the formation and removal of mechanical impurities in the foaming surface-active substances during combustion of the charge, the perforation on all intervals of the processed layer is carried out by the perforator with the phasing 30-40° education after combustion of the charge vertically-inclined spiral fractures around the borehole in the critical zone, which is not closed during subsequent fracturing and provide the hydrodynamic coupling of the well with the reservoir, when assembling the charge to preserve the integrity of the design and reduce the impact of temperatures on the logging cable during combustion of the charge use extended up to 2.0-2.5 m in the upper and elongated to 1.0-1.5 m lower rod attached to both ends of the bearing portion of the rod.



 

Same patents:

FIELD: oil and gas industry.

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1 tbl

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FIELD: oil production, particularly methods for stimulating oil production.

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EFFECT: reduced accident risk, decreased thermal impact action on borehole cable, possibility of well normal operation after treatment thereof due to prevention of pump clogging with mechanical impurities and pyrobitumens during well operation starting and increased perfection of reservoir drilling-in.

2 dwg

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4 cl, 2 tbl, 2 dwg

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