RU2592865C1 - Method of productive formation processing and device for its implementation as per pgda-m technology - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and can be used for productive formation processing. Method involves gas-dynamic formation fracturing by combustion in the productive formation interval of a powder charge of solid-propellant material with a filler burning-stabiliser having a round central channel with simultaneous accumulation of powder gases pressure in the central charge channel cavity, with further transfer of the charge combustion energy to the formation. Combustion of the powder charge is performed in several modes, wherein the number and the frequency of pulses depend on the combination of charges formed as blocks on cylindrical surfaces of which directed parallel to their central channel axis there are mutually perpendicular-longitudinal slots of an evenly even amount. Device comprises a caseless charge of solid-propellant material, connected to a conducting wire made as a cylindrical stick with an igniter and the central channel, having the ratio of length to diameter equal to (30-38): 1. Note here that on the cylindrical surface of the stick parallel to the axis of its central channel there are mutually perpendicular-longitudinal slots, and their number is evenly even, which ensures the possibility of alternating the charges depending upon the method: 4+8 or 4+8+12, while two of the slots have a flexible element connected with the conducting wire.

EFFECT: technical result consists in improved efficiency of affecting on oil-and-gas-bearing formations.

4 cl, 6 dwg

Description

The present invention relates to the oil and gas industry, in particular to devices made of solid propellant materials, which, during their burning in the wellbore, carry out gas-dynamic fracturing or thermogas-chemical treatment of the formation in order to increase oil production by increasing the filtration characteristics of rocks and cleaning the borehole zone of the formation from various deposits.

Such devices are called gunpowder pressure generators. Designs of known devices are various. Common to them is the presence of checkers (one or more) of solid fuel, lowered into the well using a cable rope. These checkers, installed in the interval of treatment of the reservoir, are ignited using an electric current supplied from the surface of the earth via a geophysical cable.

A device for thermogasochemical processing of a productive formation according to the patent of the Russian Federation No. 2071556 IPC ЕВВ 43/26, publ. 01/10/1997, the Device is a powder acoustic pressure generator (PGDA). On opposite outer cylindrical surfaces of the PGDA checker, parallel to the axis of its central channel, longitudinal grooves are made through which a flexible element, such as a cable, passes to connect the checker to a cable cable. When using, the combustion fronts from the channel and from the grooves occur earlier than from the channel and from the outer cylindrical surfaces. The checker breaks up into two separate fragments, which fall to the bottom of the well and often go out. This leads to a sharp decrease in the resulting (over the entire surface) combustion area and, as a result of this, to a drop in pressure in the well created due to the combustion of PHGD. The closest in technical essence and the achieved result to the proposed technical solution is a device for thermogaschemical processing of a productive formation according to the patent of the Russian Federation No. 2151282, IPC No. 21B 43/25, published on June 20, 2000. This device additionally creates a vibrating effect on the formation due to creating acoustic radiation from the central channel of the cylindrical checker. Radiation occurs due to vibrational or pulsating combustion. The device is a powder acoustic pressure generator (PGDA). This device is taken as a prototype.

The device contains an unpacked charge of solid propellant material, which is connected to a cable cable and made in the form of a continuous cylindrical block with an igniter and a central circular channel. The ratio of the length of the channel to its diameter is (40-120): 1. Rows of transverse through channels with a diameter of 0.25-1.1 times the diameter of the central circular channel are perpendicular to the central circular channel in the charge body along its length. In each row, the transverse through channels are made intersecting at right angles to each other, and the distance along the length of the charge between each two adjacent rows of transverse through channels is equal to the ratio (20-40): 1 of the length of the central circular channel to its diameter. The device further comprises segments of solid propellant material protruding from the checker located on opposite cylindrical surfaces of the checker parallel to the axis of its central channel. In the segments, two diametrically located grooves for the equipment rope are made. The location between the grooves is equal to the outer diameter of the cylindrical part of the checker. The ratio of the circumference of the checker to the base of each of the protruding segments is (6-9): 1.

The disadvantages of the prototype device are the low impact on the formation and deformation of charges during operation, as well as the inability to use this generator in a well with an inner diameter of 110-127 mm.

A method for treating a reservoir is known from the patent literature, according to which, in the interval of the reservoir, a powder charge is burned from a solid propellant material with a filler stabilizer (HC) of combustion. The accumulation of pressure of the powder gases is carried out in the cavity of the Central circular channel. In it, the length and diameter are related by the ratio (20-40): 1 with the content of combustion NS to the total mass of the central circular channel of not more than 1.5%. In the cavity of the central channel, in which the length and diameter are related by the ratio (40-120): 1, the content of HC is not more than 0.6%. The pressure of the powder gases from the cavity of the Central channel is transmitted to the reservoir in the form of pressure pulses through radial channels and end surfaces. As a result of combustion in the cavity of the central circular channel, thermogasochemical, baric, vibro-microwave exposure is performed with simultaneous alternating electrical exposure (RF patent No. 2103493, IPC EI 43/25, publ. 01.27.1998). This method is a prototype to the proposed technical solution to the method of processing the reservoir.

The disadvantage of the prototype method is the low efficiency of the impact on the reservoir because it operates in a single-pulse mode and has limited control of the processing process (the process can be controlled only by changing the number of charges).

The task of creating a group of inventions is: increasing the efficiency of the impact of solid fuel combustion products on oil and gas strata by increasing the burning rate of powder charges, eliminating charge deformation during operation, reducing the overall dimensions of the generator while maintaining energy.

The problem is solved using the characteristics specified in the 1st claim that are common with the prototype, such as a method for treating a reservoir, including gas-dynamic fracturing of a reservoir by burning a powder charge from a solid propellant material with a round stabilizer filler in the interval of the reservoir channel with the simultaneous accumulation of pressure of the powder gases in the cavity of the Central channel of the charge with subsequent transfer of the energy of combustion of the charge into the reservoir, and distinctive There are several characteristic features such as the burning of a powder charge in several modes, the number and frequency of pulses depending on the combination of charges in the form of checkers on a cylindrical surface of which mutually perpendicular longitudinal grooves are made parallel to the axis of their central channel, with their number being a multiple of four.

According to paragraph 2 of the claims, when alternating charges with four and eight grooves, two pulsed combustion modes are used.

According to paragraph 3 of the claims, when alternating charges with four, eight and twelve grooves, three pulsed combustion modes are used.

The problem is solved using the signs specified in the 4th paragraph of the claims, common with the prototype, such as a device for gas-dynamic fracturing of a reservoir containing a shell of solid fuel material connected to a cable-cable, made in the form of a continuous cylindrical checker with an igniter and the central circular channel, and distinctive essential features, such as the ratio of the length to the diameter of the specified channel is (30-38): 1, and on the cylindrical surface of the checker the axis of its central channel is made mutually perpendicular to the longitudinal grooves, and their number is a multiple of four, two of which have a flexible element connected to the cable cable.

According to paragraph 5 of the claims, the unpacked charge additionally includes checkers identical in design, including nano- or ultrafine aluminum.

The above set of essential features in both the device and the method allows to obtain the following technical result - by replacing the protrusions on the cylindrical surface with grooves, the overall size (diameter) of the powder charges and assembly device is reduced from 114 mm to 105 mm, thereby ensuring well treatments with an internal diameter of 110 mm. The method is implemented using a device that operates in multipulse mode, and the number and frequency of pulses depends on a combination of charges in the form of checkers on a cylindrical surface of which mutually perpendicular longitudinal grooves are made parallel to the axis of their central channel, with their number being a multiple of four.

In support of the distinguishing features, it should be noted that, for example, according to patent No. 2170339, long charges are deformed during operation (immersion in a well with a temperature of 100 g. Celsius), see FIG. 5. From the resistance of the materials it is known (see Fig. 6) that, during compression, the length of the compressed beam is calculated by the formula: L _cr = µL, for our case µ = 0.8, by further calculations it can be established that, with a decrease in the length ratio channel to its length from 43 to 33, we reduce the bend of the charge by 1.5 times, that is, the effect is significant. Therefore, in our case, the ratio of the length to the diameter of the central circular channel is (30-38): 1, is optimal.

The implementation of the grooves on the surface of the checker multiple of four is determined by calculation and is optimal in the proposed design, which implements a method of processing a productive formation.

In patent No. 2170339, the solid fuel elements of the powder pressure generator are located between the cumulative charges of the explosive or near the charges of the explosive, including in contact with them, or in the lower part of the device instead of the cargo or part of this cargo, while the solid fuel elements do not intersect the axis of the cumulative jets and made of non-metallized ballistic or mixed solid rocket fuel in the form of cylinders with a central circular channel, in which the length and diameter of the central channel are connected relation (20 ... 40): 1 - i.e. they are optional elements and bounded by mass, and the proposed design is solid charge is the main element.

The invention is illustrated by the following drawings.

FIG. 1 is a general view of the device, a longitudinal section;

FIG. 2 - unburdened charge;

FIG. 3 is a section along по-A of FIG. 2, a) with 4 grooves, b). with 8 grooves, c) with 12 grooves;

FIG. 4 - examples of the method a) the generator contains charges with only 8 grooves,

b) the generator contains charges with 4 and 8 grooves, c) the generator contains charges with 4 and 8 and 12 grooves;

FIG. 5 - photo deformation of the charge according to patent No. 2103493;

FIG. 6 is a test chart.

A device for gas-dynamic fracturing of a reservoir (Fig. 1), contains an unbased charge of solid propellant material 1 connected to a cable-cable 2, made in the form of a continuous cylindrical block with an igniter 3 and a central circular channel 4. The ratio of the length to the diameter of the specified channel is equal to ( 30-38): 1 (Fig. 2). On the cylindrical surface of the checker, parallel to the axis of its central channel 4, there are mutually perpendicular longitudinal longitudinal grooves 5 (Figs. 2, 3), and their number is a multiple of four, two of which have a flexible element 6 connected to the cable-cable 2. Position 7 in FIG. . 1 shows a clamp / clip for a flexible member, and at 8, an electrical wire to an igniter. The unpacked charge additionally includes checkers identical in design, including nano- or ultrafine aluminum.

A device for gas-dynamic fracturing of a reservoir (Fig. 1) is lowered into a well on a geophysical cable 2 and consists of powder charges 1 made in the form of separate blocks with a central channel 4 connected between the cover 9 and the pallet 10 by a cable 6, in powder charges 1, of which at least two igniters, electrically connected to the geophysical cable, charges 1 and the central channel 4 of charges are made round. On the outer side surface of the charges 1 are made mutually perpendicular to the longitudinal grooves 5, when their number is a multiple of four (Fig. 3).

A device for gas-dynamic fracturing of the reservoir works as follows. On the geophysical cable, it descends into the processing interval. After that, a spiral 11 of igniter charges 1 is supplied through the electric wire 8 of the geophysical cable. The spirals are heated and ignite the powder charges 1. The combustion of powder charges 1 in the well is accompanied by mechanical, thermal and physico-chemical effects on the reservoir, which allows to increase the flow of oil in production wells.

An example implementation of the method.

A method of treating a productive formation involves gas-dynamic fracturing of a formation by burning a powder charge 1 (Fig. 1) from a solid fuel material with a filler-stabilizer of combustion with a central circular channel 4 in the interval of the productive formation while simultaneously accumulating the pressure of the powder gases in the cavity of the central charge channel with subsequent transfer burning energy of the charge in the reservoir. Burning of the powder charge is carried out in several modes, the number and frequency of pulses depending on the combination of charges in the form of checkers, on the cylindrical surface of which are parallel to the axis of their central channel mutually perpendicular to the longitudinal circular grooves, when their number is a multiple of four (Fig. 3).

When alternating charges with four and eight grooves, two pulsed combustion modes are used.

When alternating charges with four, eight and twelve grooves, a three-pulse combustion mode is used.

Since the outer side surface of the powder charges 1 has diametrically located longitudinal grooves in an amount multiple of four, the surface area of the combustion of powder charges increases, and the presence of four grooves increases the combustion area by 10%, and by 8 - by 20%, and 12 - by 30%. The most optimal for calculating the energy of the device is 10%.

According to the invention, the burning rate and the pressure acting on the formation are increased, which increases the efficiency of the device for gas-dynamic fracturing of the reservoir.

Examples of alternating charges in the form of graphs are shown in FIG. 4 a) single-pulse mode — the generator contains charges with only 8 grooves, b) two-pulse mode — the generator contains charges with 4 and 8 grooves, c) three-pulse operation — the generator contains charges with 4 and 8 th and 12th grooves. Moreover, the invention allows not only to increase the efficiency of well treatment, but also to save fuel in the manufacture of checkers.

From the description and practical application of the present invention, specialists will be obvious and other private forms of its implementation. This description, examples and drawings are considered as material illustrating the invention, the essence of which and the scope of patent claims are defined in the following claims, a combination of essential features and their equivalents. The above described device is called by the authors "Programmable Acoustic Multimode Pressure Generator" (PGDA-M)

Claims (4)

1. A method of treating a productive formation, including gas-dynamic fracturing of a formation by burning a powder charge from a solid propellant material with a filler-stabilizer of combustion with a central circular channel in the interval of the productive formation, while simultaneously accumulating the pressure of the powder gases in the cavity of the central charge channel, with subsequent transfer of charge burning energy into the formation, characterized in that the combustion of the powder charge is carried out in several modes, and the number and frequency of pulses depend on the combination and charges in the form of checkers, on the cylindrical surface of which are parallel to the axis of their central channel mutually perpendicular to the longitudinal grooves, with their number being a multiple of four. 2. The method according to claim 1, characterized in that when alternating charges with four and eight grooves, a two-pulse combustion mode is used. 3. The method according to claim 1, characterized in that when alternating charges with four, eight and twelve grooves, a three-pulse combustion mode is used. 4. A device for gas-dynamic fracturing of a reservoir containing an unbroken charge of solid propellant material connected to a cable cable made in the form of a cylindrical block with an igniter and a central channel having a length to diameter ratio of (30-38): 1, characterized in that on the cylindrical surface of the checker, parallel to the axis of its central channel, mutually perpendicular longitudinal grooves are made, and their number is a multiple of four, with alternating charges depending on the method according to claim 1 4 + 8 or 4 + 8 + 12, in two pa for which a flexible element is mounted connected to a cable cable.

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