RU2297530C1 - Method for gas-dynamic processing of formation and device for realization of said method - Google Patents

Abstract

FIELD: oil extractive industry.

SUBSTANCE: method includes assembly of unpackaged section charge by letting composite bar through central channel of charge sections with developed surface, contracting and packing of charge sections tightly with each other, positioning of lower sections of gas flow draining disperser charge, forming during combustion of charge sections, with through apertures, lowering and installing of charge in processing interval, combustion of charge sections, accompanied by temperature increase and generation of hot gunpowder gases. In accordance to invention, additional gas stream draining disperser is located above charge sections assembled higher. Dispersers are made so that cylindrical parts are added to them without through apertures, which are located on the sides of assembled charge sections. Central channel of charge sections and adjacent parts of internal hollows of dispersers without through apertures are filled with substance, which prevents charge sections heating above the temperature of their ignition. Sections of internal hollows of dispersers with through apertures are filled with viscous inert substance, which in case of combustion of charge sections and creation of increased pressure in internal charge hollow exits disperser apertures first and creates a closed volume in well in processing interval, separating formation processing interval from whole borehole - packer is created. Invention includes a formation processing device with an additional disperser.

EFFECT: possible operation in deep wells on thermal deposits.

2 cl

Description

The present invention relates to means for oil production.

The method of gas-hydraulic exposure to powder gases is based on the mechanical, thermal and chemical effects of gases on rocks and their saturating fluids. To use the method, powder gas generators of pressure ПГД.БК-100 М, ПГД.БК-150 and pressure accumulators АDS-150 are used [1].

There is a method of gas-hydraulic impact on the reservoir, including the assembly of a charge by passing parts of the tool to collect sections of charge through the Central channel of each section of the charge and pulling them close to each other by the parts of the equipment [2]. As the ignition section of the charge, a support tube with pyrotechnic igniters is used, in the upper part it is sealed with a cable head, to which a geophysical cable is attached with two main sections of the charge attached to it with an upper tip, and in the lower part is sealed with a plug with a cable attached to it close to the ignition section put on three main sections of the charge. The device is lowered into the well and installed above the perforation interval by 2-4 meters. They ignite the ignition sections, which burn through the walls of the pipes and ignite the ignition section of the charge, and from it the main sections of the charge. Charge burning occurs from the channel. The lateral surface of the charge has a protective coating that protects the charge from friction and impact on the column.

Charges are collected on the geophysical cable, at the junction of the charges during their burning, overheating and rupture of the wireline cable occur. The charge sections are disconnected, which can lead to an emergency. Tooling elements, protective coating, charge connection nodes remain in the well. There is a cable overlap. Setting the charge in the well above the perforation interval leads to the fact that the pressure of the borehole fluid, which transfers the energy of the gases, acts on the treated formation.

As the closest analogue, the method of gas-hydraulic stimulation of the formation [3], including the assembly of a package without charge by passing a composite rod through the Central channel of each section of the charge. The sections of the charge are pulled together and tightened close to each other, equipment parts are installed for the safe descent of the charge into the well and its burning. The charge is set in the well so that the charge sections are opposite the perforation holes, and its sections are burned. In order to effect a pulsed action on the formation with high temperature and pressure, charge sections are burned over the entire surface; for this purpose, a shell charge is used, and the configuration of the central channel of the charge sections is taken with a developed surface. This method is implemented and successfully used in oil and gas fields.

As the closest analogue of the device, an open-sectional charge for gas-hydraulic stimulation was chosen [4] - this device is designed to implement a method of gas-hydraulic stimulation of the reservoir [3]. The charge sections have a central channel, the configuration of which is shaped with a developed surface. The equipment includes parts for collecting charge sections and parts for tightening sections close to each other. To collect sections of the charge using a composite rod, passed through the Central channel of each section of the charge. Below the charge sections is a diffuser for the removal of the gas stream generated by the combustion of the charge.

The charge has passed acceptance tests, is mass-produced and successfully used in oil and gas fields. But the use of charge is limited by its technical characteristics. The maximum ambient temperature is 100 ° C. at higher temperatures and a long stay in the well, the powder sections of the charge are heated, chemical reactions begin to occur in them, which can lead to unauthorized ignition of the charge. Those. the use of these charges in fields with a temperature in the wells above 100-130 ° C is associated with the risk of an accident.

The technical result of the invention is to increase the heat resistance of the charge and the ability to use it in deep wells (depths over 3500-4000 meters) in thermal deposits. So, in most fields of Western Siberia, Vietnam, the temperature in the wells reaches 150 ° C.

The necessary technical result is achieved by the fact that in the method of gas-dynamic impact on the formation, which includes assembling an unpackaged sectional charge by passing a composite rod through the central channel of the charge sections, with the configuration of the central channel with a developed surface, tightening and pressing the charge section close to each other, the location below the collected sections of the charge of the diffuser of the discharge of the gas stream generated during the combustion of the sections of the charge, with through holes, the descent and installation of the charge in the interval of the image edema, burning of the charge sections, accompanied by an increase in temperature and the formation of hot powder gases, according to the invention, when using the method in thermal deposits, in deep wells, the charge temperature is increased, the temperature in the well is determined into the internal charge cavity, which is the central channel of the charge sections and the internal cavity of the diffuser for venting the gas stream, a substance with increased heat absorption, for example paraffin, which does not allow the charge sections to warm up, is introduced charge above the flashpoint.

In addition, prior to the impact, the zone in the borehole is separated from the entire borehole of the liquid in the processing interval, creating a packer, for this, an additional diffuser of the gas flow is placed above the collected sections of charge, while the diffusers are made so that they additionally add cylindrical parts without passage holes which are located on the sides of the collected charge sections, the central channel of the charge sections and the adjacent internal cavity of the diffuser parts without passage holes are filled with increased heat absorption, and the internal cavities of part of the diffusers with passage holes are filled with a highly viscous inert substance, for example glycerin, which, when igniting the charge sections and creating an increased pressure in the internal cavity, first leaves the diffuser openings, thereby creating a closed volume in the well in the processing interval .

A device for the gas-dynamic impact on the formation, including sections of a single charge with a central channel, the configuration of which has a developed combustion surface, and equipment, including a composite rod passed through the central channel of each charge section, a diffuser for exhausting the gas stream with passage openings located below the assembled charge sections, parts for tightening and tightened charge sections close to each other, parts for ensuring safe combustion and centering of the charge in the well, from characterized by the fact that the charge is made heat-resistant, for this the central channel of the charge sections and the internal cavity of the diffuser are hermetically sealed and filled with a substance with increased heat absorption, for example paraffin, to ensure the tightness of the internal cavity of the charge, the junction of the charge sections, the junction of the charge sections and the diffuser and the holes of the diffuser are sealed from the external environment by a casing or plugs, which ensure the leak of the diffuser when the charge is burning.

In addition, an additional gas flow exhaust diffuser is installed above the collected charge sections, while the diffusers are designed so that they additionally add cylindrical parts without passage holes located on the sides of the collected charge sections, the central channel of the charge sections and the adjacent internal cavities of the diffuser parts without the passage openings are filled with a substance with increased heat absorption, for example paraffin, and the internal cavities of the part of the diffusers with the passage openings are filled in a highly viscous inert substance such as glycerin

The method is as follows. Assemble the charge. The temperature in the well is determined. If the temperature in the well in the processing interval is higher or close to the maximum allowable temperature specified in the technical specifications for a particular type of charge, then to reduce the risk of spontaneous ignition of the charge during descent and installation in the interval of exposure to the formation, increase its heat resistance. To do this, when the charge is assembled, a substance with increased heat absorption, for example paraffin, is introduced into the internal charge cavity, which is the central channel of the charge sections and the internal cavity of the diffuser, for removing the gas stream. When choosing a substance, the temperature in the well is taken into account - the higher the temperature in the well, the greater the heat absorption of the substance. In addition, the depth of the well is taken into account - with a large depth of the well, for example 3500-4000 meters, the charge descent time in the processing interval increases, and accordingly, the charge residence time in the borehole fluid with an elevated temperature also increases, which can lead to unauthorized actuation of the charge during descent into the well.

As the descent into the well, the temperature in the well rises, the charge sections heat up. A substance with increased heat absorption, for example paraffin, located in the internal cavity of the charge, takes part of the heat and prevents the charge sections from warming up and unauthorized ignition during the descent and installation of the charge in the processing interval. During combustion of the charge sections, a large number of hot gases are formed, which, through the charge diffuser and perforation holes, enter the reservoir under pressure. With an increase in pressure 1.5-1.8 times higher than the mountain pressure (depending on the characteristics of the formation), the formation ruptures with formation of fracturing in the bottomhole zone of the formation.

A device for gas-dynamic stimulation of a formation includes charge sections made of compositions providing combustion in an aqueous, oil-water, and acidic environment, for example, ballistic solid rocket fuel. The charge sections have a central channel, the configuration of which takes the form of a developed combustion surface to provide a given burning time and pressure for hydraulic fracturing. The equipment includes parts for collecting charge sections, parts for tightening sections close to each other, and parts for safe burning of charge sections. To collect sections of the charge using a composite rod (composed of several elements). Using a composite rod allows you to collect a charge from a different number of sections and simplify the delivery of the rod to the well. The bar is passed through the central channel of each charge section. From both ends, to the bar, on which the charge sections are assembled, centralizer cones are attached for tightening and tightened the charge sections close to each other. Centralizer cones are streamlined to reduce the mechanical load on the bar. Their diameter exceeds the diameter of the charge sections, which allows you to protect the charge from friction and impact on the column. A diffuser is located between the lower cone-centralizer and the charge sections to divert the gas flow generated during the combustion of the charge.

The central channel of the charge sections and the internal cavity of the diffuser are the internal cavity of the charge into which a substance with increased heat absorption, for example paraffin, is introduced. The substance may be in solid, liquid or gel form. To ensure the tightness of the container, the joints of all the elements of the container are hermetically sealed. Centering rings seal the joints of the charge sections, the diffuser holes are sealed from the external environment by a casing or plugs, which are knocked out by the gas formed during the combustion of the charge. Sealed gaskets are installed between the diffuser and the charge sections. The diameter of the charge sections, the configuration of the central channel of the charge sections, and the internal volume of the diffuser are designed to ensure the delivery of the required volume of a substance with increased heat absorption, for example, paraffin, which prevents the charge sections from heating up above the flash point of the charge.

If the temperature in the well is high and the volume of the substance with increased heat absorption is not enough to prevent the charge sections from warming up, then an additional diffuser is installed above the collected charge sections to increase the volume of the internal cavity of the charge. It is possible to increase the volume of the internal cavity of the charge if the diffusers are made so that they additionally add cylindrical parts without passage holes located on the sides of the assembled charge sections.

In addition, you can separate the zone in the borehole in the processing interval from the entire wellbore fluid, creating a packer. For this, the central channel of the charge sections and the adjacent internal cavity of the diffuser parts without passage holes are filled with a material with increased heat absorption, and the internal cavities of the diffuser part with passage holes are filled with a highly viscous inert substance, such as glycerin or a viscoelastic composition based on polyacrylamide or hypane, which, when ignited, sections of the charge and the creation of an increased pressure in the internal cavity of the charge, the first leaves the holes of the diffuser, thereby creating a lock mentioned volume in a wellbore in the interval processing.

After completion of the work, the metal tooling rises from the well and is reused.

Thus, the proposed method allows to expand the use of powder charges in deep wells and thermal deposits, to reduce the risk of accidents in the well.

Information sources

1. Rifle-blasting equipment: Reference book / L.Ya. Fridlyander, V.A. Afanasyev, L.S. Vorobyev, etc. / Ed. L.Ya. Fridlyander, - 2nd ed. Re-worker. and Assoc. - M., Nedra, 1990, Section 4.1. Powder pressure generators. pg. 107-108.

2. Rifle-blasting equipment: Handbook / L.Ya. Fridlyander, V. A. Afanasyev, L. S. Vorobyov, etc. / Ed. L.Ya. Fridlyander, - 2nd ed. Re-worker. and add. - M., Nedra, 1990, Section 4.1. Powder Pressure Generators, pp. 109-112.

3. Patent for the invention of the Russian Federation No. 2187633 The method of gas-hydraulic stimulation. Patent holder M. Paderin, by application No. 2001123722, priority date 08.28.2001, authors M. Paderin, N. Efanov, N. M. Paderina

4. Patent for invention No. 2178072 "Sectional open-cell charge for gas-hydraulic stimulation of the formation." Patent holder M. Paderin, by application No. 2001016461 of 10.23.2000

Claims (2)

1. The method of gas-dynamic impact on the reservoir, including the assembly of an open-section sectional charge by passing a composite rod through the central channel of the charge sections, having a developed surface, tightening and preloading the charge sections close to each other, the location of the lower charge sections of the diffuser of the exhaust gas flow generated by burning sections charge, with through holes, the descent and installation of the charge in the processing interval, the burning of charge sections, accompanied by an increase in temperature and the formation of th hot powder gases, characterized in that above the collected charge sections have an additional diffuser for exhausting the gas stream, while the diffusers are configured so that they additionally add cylindrical parts without passage holes, which are located on the sides of the collected charge sections, the central channel of the charge sections and adjacent to parts of the internal cavities of the diffusers without passage holes are filled with a substance that prevents the charge sections from warming up above their flash point, and parts of the internal the diffuser cavities with passage holes are filled with a viscous inert substance, which, when igniting charge sections and creating an increased pressure in the internal cavity of the charge, first comes out of the diffuser holes and creates a closed volume in the well in the processing interval, which separates the interval of exposure to the formation from the entire wellbore - create a packer . 2. A device for gas-dynamic impact on the formation, including sections of a single charge with a central channel having a developed surface, and equipment, including a composite rod passed through the central channel of each charge section, a diffuser for exhausting the gas stream with passage openings located below the collected charge sections, parts for tightening the charge sections close to each other, parts for ensuring safe combustion and centering of the charge in the well, characterized in that it is higher than the collected sections of the charge Yes, an additional gas flow exhaust diffuser is installed, while the diffusers are designed so that they additionally add cylindrical parts without passage holes located on the sides of the collected charge sections, the central channel of the charge sections and adjacent parts of the internal cavities of the diffusers without passage holes are filled with a substance that prevents the charge sections from warming up above their flash point, and parts of the internal cavities of the diffusers with passage holes are filled with a viscous inert the ability to separate the interval of impact on the formation from the entire trunk - the creation of the packer.