RU2204706C1 - Method of treatment of formation well zone and device for method embodiment - Google Patents

Method of treatment of formation well zone and device for method embodiment Download PDF

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Publication number
RU2204706C1
RU2204706C1 RU2002117005/03A RU2002117005A RU2204706C1 RU 2204706 C1 RU2204706 C1 RU 2204706C1 RU 2002117005/03 A RU2002117005/03 A RU 2002117005/03A RU 2002117005 A RU2002117005 A RU 2002117005A RU 2204706 C1 RU2204706 C1 RU 2204706C1
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Russia
Prior art keywords
charges
formation
powder
charge
zone
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RU2002117005/03A
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Russian (ru)
Inventor
А.М. Дуванов
А.В. Балдин
Н.И. Новоселов
А.В. Дуванов
бов С.С. Р
С.С. Рябов
Н.Г. Ибрагимов
Э.Х. Афиатуллов
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Закрытое акционерное общество "Пермский инженерно-технический центр "Геофизика"
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Priority to RU2002117005/03A priority Critical patent/RU2204706C1/en
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Abstract

FIELD: oil producing and ore mining industries; applicable in increase of bottom-hole formation zone by hydraulic fracturing and formation of fractures by other methods. SUBSTANCE: method includes location of string of powder and ignition charges in interval of producing formation; charges are burnt with the help of electric fuse located in channel of ignition charge with building up of pressure pulse of preset value. Ignition charge is arranged above perforation zone at a distance providing for the required volume of fluid between said charge and perforation zone for formation fractures in formation. Successively accomplished are hydraulic fracturing and thermogas chemical treatment of formation well zone for one round-trip operation. Power charges with developed burning surface are arranged above ignition charge. Powder charges which form high-temperature products in burning are located below ignition charge. High-temperature produced chemical composition facilities removal of colmatage deposits. Device for method embodiment has string of powder charges and one ignition charge. Located in channel is ignition charge, load-carrying logging cable, upper and lower hangers with endpieces. Lower hanger consists of metal body with conical hole for securing logging cable and with recess for laying cable central conductor to ignition cartridge. There are plug and endpieces. Ignition charge separated said string into two parts. Upper part accommodates powder charges with developed burning surface, and lower part, has normal powder charges. EFFECT: higher efficiency of method due to hydraulic fracturing of formation and thermogas chemical treatment of it, increased reliability of device. 3 cl, 2 dwg

Description

 The invention relates to the oil and gas and mining industries, is intended to increase the permeability of oil and gas reservoirs by hydraulic fracturing and fracturing of the bottomhole formation zone.
 In the technology of industrial extraction of oil and gas, various methods of intensifying production by using explosive materials (VM) are widely used.
 A known method of hydraulic fracturing of a productive formation with thermochemical treatment by creating in the well an excess pressure exceeding the pressure in the zone of the perforated formation. The powder charge is installed in the zone of the productive formation or under the roof of the formation, the effect on the formation is through the channels in the casing with jets of liquid under pressure and the products of combustion of gunpowder. Gunpowder gases have a high temperature and melt paraffinic and resinous compounds (see Chazov GL and other Thermogasochemical effects on low-yield and complex wells. M: Nedra, 1986, pp. 107-106).
 Such a technology requires a large expenditure of energy and, as a consequence, a large consumption of powder charges.
 There is a method of intensifying oil and gas production by hydraulic fracturing of a productive oil and gas bearing layer, including the descent of the main VM charge into the zone of the productive formation of the well and an additional charge at a distance of 1.5-12 m from it, simultaneous bringing the charges into working condition by undermining or igniting them, exposure streams of liquid and gases on the rock of the reservoir, while the fluid in the well between the charges of the VM is compressed to a pressure higher than the mountain, in the zone of the reservoir above and below the charges VM install shielding cylindrical elements (RF Patent 2069743, E 21 V 43/116, 11/27/96, bull. 33). This patent is a prototype of the invention.
 The method provides an increase in the efficiency of hydraulic fracturing, a decrease in the consumption of explosive material, a decrease in the effect of a shock wave on the adhesion of a cement stone to a rock. However, in reality, this method is not technologically advanced, since the device that implements it was cumbersome and dangerous to operate, a sharp increase in pressure in the perforation zone of the well weakens the casing and creates an increased emergency situation. In addition, a decrease in the amount of VM used will lead to a decrease in the amount of gases entering the formation through perforation channels, therefore, the possibility of thermogasochemical impact on the rock will decrease.
 A powder pressure generator is known, consisting of tubular armored powder charges, the central charge in the generator assembly is igniter, a tube with an electric fuse is placed in its channel, powder bombs are inserted into the channels of the remaining charges, which serve to increase the combustion surface and have a central channel under the carrier cable (Patent RF 933959, E 21 B 43/26, 06/07/1982].
 The disadvantage of the generator is the low rate of increase in pressure and the lack of the possibility of its regulation.
 A solid fuel gas generator with an adjustable pressure pulse for stimulating wells is known, including tubular armored powder charges with an ignition charge below them and a load-bearing geophysical cable with structural fasteners, and unarmored tubular charges with a large initial surface are placed between the ignition charge and armored charges on the outer surface combustion, taken in a certain ratio (RF Patent 2175059, E 21 B 43/263, 10/20/2001, bull. 29). This technical solution is a prototype of the invention.
 The gas generator provides an increase in the growth rate of the pressure of the powder gases, expands the possibilities of influencing the reservoir by selecting the speed and loading of rocks. However, the device has a very complex design, and multichannel (slotted) charges are not used due to the complex technology of their manufacture. In addition, it contains tips that, after the combustion of charges remain in the well and, together with the remnants of the unburned, armor coating charges, clog the face.
 SUMMARY OF THE INVENTION The invention is aimed at creating a method and device for processing the near-wellbore zone of the formation, which allows to increase the efficiency of explosive methods of processing the well in order to intensify oil and gas production and reduce accident rate during work.
 The technical result consists in the fact that in one round-trip operation by combining two methods of influencing the borehole zone of the formation with a large amount of powder gases (hydraulic fracturing and thermogasochemical effects on the formation), oil and gas production is intensified by increasing the permeability of the productive formation, and the beneficial effect of the powder charges and reduces the cost of processing the borehole zone of the reservoir due to the disposal of powder charges. Reliable fixing of the geophysical cable in the lower suspension of a garland of charges is ensured, which creates the conditions for safe operation.
 The technical effect is achieved by placing in the interval of the productive formation a garland of powder and igniter charges, burning them with an electric igniter located in the channel of the igniter charge, with the creation of a pressure pulse of a given magnitude, the igniter charge is placed above the perforation zone at a distance providing the necessary volume of fluid between the aforementioned charge and perforation zone for formation of cracks in the formation, sequentially produces hydraulic fracturing and thermogasochemical treatment Botko reservoir near-well zone in one run, provided that the above igniter charge powder charges with a developed surface combustion, and below said igniter charge a powder charges, during the high-temperature products the chemical composition which facilitates removal of deposits which are formed colmatation combustion. The method is implemented using a device containing a garland of powder and ignition charges, in the channel of which there is an ignition cartridge, a load-bearing geophysical cable, upper and lower pendants with lugs, the lower pendant consists of a metal case with a conical hole for securing the geophysical cable and a groove for outputting the central cores of the cable to the ignition cartridge, plug and tip, and the ignition charge divides the garland into two parts, in the upper part There are powder charges with a developed combustion surface, and in the lower part of the garland are powder charges, during the combustion of which high-temperature products are formed, the chemical composition of which contributes to the removal of sedimentation deposits.
Suspension tips are made of composite material that burns in the environment of powder gases. This ensures the ignition of the powder charges of the garland in two directions: upward - burning of the powder charges, the combustion surfaces of which are sufficient for effective fracturing, for example, multichannel powder charges made in the form of a beam of powder tubes, slotted powder charges, charges with a central channel made in form of "asterisk"; down - the burning of powder charges, the temperature of the combustion products and the chemical composition of which are selected so as to obtain the required gas formation process and create a high-temperature aggressive environment in the perforation zone that dissolves the clogging deposits located in the treatment zone, for example, the presence of substances CO, N in the products of combustion of powder charges 2 , N 2 , NH 3 , HCl, contained in different quantities, depending on the type of powder charge used. As the powder charges of a garland, charges used in the composition of the products of the defense industry of Russia that have exceeded their warranty period of operation can be used.
 The initiation of the beginning of the combustion process in the middle part of the garland increases the combustion surface of the powder charges, since the combustion of the charges occurs in both directions, and not in one, and the gas region formed during the combustion of the powder charges evenly acts on the upper and lower burning parts of the charge garland as a whole , which ensures the absence of movement of the garland inside the well. Given that the powder charges located above the igniter charge ignite faster due to the compression and upward movement of the liquid by the well, and the powder charges located below the ignition charge will be engulfed in flames differently: some will be fast enough due to fluid flow into the perforation channels of the well, part below the zone perforation will only burn along the end surface of the charges facing the combustion zone, since there is no downhole fluid flow down, the processing process is complete The process will take on a cyclical character, which is a consequence of the inertia of the entire column of well fluid and the dependence of the burning rate of the powder charges on the pressure created in the treatment zone, and additionally has a positive effect on the intensification process.
 In FIG. 1 shows a general view of a device for processing a borehole zone of a formation; figure 2 is a cross section of the lower suspension of the device.
 The device consists of a geophysical cable 1 (Fig. 1), which is fixed in the lower suspension, consisting of a housing 2 with a conical hole 3 and a groove 4 (Fig. 2) for wiring the central core of the cable 5, plug 6 and the tip of the lower suspension 7, which are fixed screw 8, powder charges 9 and igniter charge 10, having a Central channel 11 (figure 2) and located on the geophysical cable 1, the ignition cartridge 12, connected by one wire to the Central 5 of the cable, and the other with the outer braid of the cable and attached to the cable in places e the location of the igniter charge 10 and the upper suspension, consisting of a stopper 13 and the tip of the upper suspension 14.
 The method and device work as follows.
 The device is collected directly at the wellhead as follows. The geophysical cable 1 is passed through a conical hole 3 in the housing 2 of the lower suspension and the diameter of the lower end of cable 1 is increased, for example, bending a braided metal braid inside, cable 1 is fixed in the housing with a sharp jerk to the upper end, the central conductive core 5 freed from the braid is laid into the groove 4 of the housing 2, thereby providing the possibility of installing an ignition cartridge 12 anywhere in the garland of powder charges 9 and 10 having a central channel 11, screw the plug 6 and fix a tip 7 of the lower suspension on the plug 6 with a screw 8. To the central conductive core 5 of the cable protruding from the groove 4 of the housing 2 of the lower suspension, connect a piece of wire designed to connect the ignition cartridge 12. Through the powder charges 9, designed for thermogasochemical treatment of the well, pass free the end of the cable, together with the length of wire, fasten the ignition cartridge 12 on cable 1 and connect its ends: one to the length of the wire, the other to the outer metal sheath of the cable. The igniter charge 10 is installed by passing the free end of the cable 1 through it, and, similarly, the powder charges 9 are designed for hydraulic fracturing, the upper suspension tip 14 and stopper 13 are installed on the cable, thereby completing the assembly.
 The garland is lowered into the specified interval of the well on the geophysical cable so that the igniter charge is located above the perforation zone at a distance sufficient to create enough cracks for the volume of fluid between the ignition charge and the perforation zone from the blasting machine through the cable to the ignition cartridge located in channel igniter charge and mounted on a geophysical cable, an electrical impulse is supplied, after which the cartridge is triggered and ignites the igniter charge, which th transfers combustion to powder charges, propagating up and down the garland from the igniter charge. As powder charges located above the ignition charge, charges with a developed combustion surface were used, for example, multichannel charges consisting of a beam of powder tubes, slotted powder charges, charges with a central channel of the asterisk type, and others. As a result, sufficient pressure is created at the location of the igniter charge, at which hydraulic fracturing occurs with the formation of a network of cracks around the perforation channels, after the fracture of the formation, the borehole fluid continues to be displaced by pressure into the reservoir, and the combustion products of the powder charges reach the perforation zone, while gas perforation is blown through channels and natural pores.
After combustion of the powder charges located above the igniter charge, a pressure drop occurs. Powder charges located below the ignition charge continue to burn, and the well fluid above the garland moves down. The pressure in the treatment zone begins to change in the oscillation mode due to the inertial properties of the liquid well and the properties of the powder charges increase the combustion rate with increasing pressure and decrease it with a decrease in pressure. At the same time, in the process of burning powder charges located below the igniter charge, high-temperature products are formed in the combustion process, the chemical composition of which helps to remove the sedimentation deposits, for example, the presence in the combustion products of powder charges of substances CO, H 2 , N 2 , NH 3 , HCl contained in different quantities depending on the type of powder charge used. The tips of the upper and lower suspensions made of composite material are burned in powder gases without clogging the well, and after processing the cable is removed from the well without interference.

Claims (3)

 1. The method of processing the near-wellbore zone of the formation, including placing a garland of powder and igniter charges in the interval of the productive formation of the well, burning them with an electric igniter located in the channel of the igniter charge with the creation of a pressure pulse of a given magnitude, characterized in that the igniter charge is placed above the perforation zone by the distance providing the necessary volume of fluid between the aforementioned charge and the perforation zone for the formation of cracks in the reservoir, sequentially they perform hydraulic fracturing and thermogasochemical treatment of the near-wellbore zone of the formation in one round-trip operation, provided that powder charges with a developed combustion surface are placed above the igniter charge, and powder charges are placed below the igniter charge, during the combustion of which high-temperature products are formed whose chemical composition helps to remove deposits.
 2. A device for processing the borehole zone of the formation, containing a garland of powder and igniter charges, in the channel of which there is an ignition cartridge, a load-bearing geophysical cable, upper and lower pendants with lugs, characterized in that the lower pendant consists of a metal case with a conical hole for fixing geophysical cable and a groove for the output of the Central core of the cable to the ignition cartridge, plugs and lugs, and the ignition charge divides the garland into two e parts, in the upper part there are powder charges with a developed combustion surface, and in the lower part of the garland there are powder charges, during the combustion of which high-temperature products are formed, the chemical composition of which contributes to the removal of clogging deposits.
 3. The device according to claim 2, characterized in that the suspension tips are made of composite material that burns in the environment of powder gases.
RU2002117005/03A 2002-06-26 2002-06-26 Method of treatment of formation well zone and device for method embodiment RU2204706C1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101532383B (en) * 2009-04-17 2012-09-05 西安石油大油气科技有限公司 Pressure temperature measuring device for perforating and fracturing
US8757263B2 (en) 2006-05-31 2014-06-24 Schlumberger Technology Corporation Downhole cyclic pressure pulse generator and method for increasing the permeability of pay reservoir
CN104453820A (en) * 2014-11-06 2015-03-25 中国石油天然气股份有限公司 Movable type deep well burning oil layer ignition tubular column and ignition method thereof
US10927627B2 (en) 2019-05-14 2021-02-23 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
USD922541S1 (en) 2020-03-31 2021-06-15 DynaEnergetics Europe GmbH Alignment sub

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8757263B2 (en) 2006-05-31 2014-06-24 Schlumberger Technology Corporation Downhole cyclic pressure pulse generator and method for increasing the permeability of pay reservoir
CN101532383B (en) * 2009-04-17 2012-09-05 西安石油大油气科技有限公司 Pressure temperature measuring device for perforating and fracturing
CN104453820A (en) * 2014-11-06 2015-03-25 中国石油天然气股份有限公司 Movable type deep well burning oil layer ignition tubular column and ignition method thereof
US10927627B2 (en) 2019-05-14 2021-02-23 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
USD922541S1 (en) 2020-03-31 2021-06-15 DynaEnergetics Europe GmbH Alignment sub

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