Gas-dynamic formation fracturing method

FIELD: oil and gas industry.

SUBSTANCE: method involves assembly of a pressure generator in the form of a group of cylindrical solid fuel charges with central through channels, lowering of the pressure generator to the well, installation of the pressure generator at the specified depth of the well, supply of a signal for ignition of charges and fracturing of the formation. In the existing casing string of the well, preliminary perforation density is performed as 30-45 holes per running metre, assembly of a pressure generator is performed out of three groups of solid fuel charges with location of charges of the first group below charges of the second and the third groups; the pressure generator is installed in the well above the perforation interval so that ratio of distance between upper perforation boundary and lower charge of the first group to length of perforation interval comprises the value of 0.3-0.6. The first group of charges has a charge with an igniter and total design weight of all charges, which provides the possibility of ignition of above located charges of the second group with the developed combustion surface and gas emission at combustion, which provides opening of existing vertical fractures in the formation and initiation of combustion of charges of the third group, which provide non-reversible deformation of mine rocks of the formation with creation of a residual vertical fracture.

EFFECT: improving filtration properties of the formation throughout its thickness.

9 cl

 

The invention relates to the oil industry and can be used to increase the filtration properties of the productive formation through the disclosure of existing and/or create additional cracks or network of cracks.

The known method of gas-dynamic fracturing, including the descent into the well sectional device in the form of an annular propellant charges in each section with a specified distance between the sections, starting with igniters installed in the Central channel of each section, the combustion of each partition, starting from the bottom, at a specified time using the remote control (see, for example, patent RU 2030569, 10.03.1995).

In accordance with the known solution combustion for each of the subsequent sections is carried out by the time of reaching the maximum value of pressure in the area of the processed layer. The distance between the sections is chosen from the condition prevent spontaneous ignition of the charges the subsequent sections from the previous combustion. After combustion of the charges of the lower section, by the end of the movement of the column of fluid down the well and achieve the maximum value of the pressure in the zone of the processed layer, perform burning charges subsequent section by filing an electric pulse on the corresponding period in this section is usawoa the igniter. The combustion charge each subsequent sections leads to increased pressure fracturing and increase the size of the cracks. The disadvantage of this method is the need for synchronization of the ignition charge sections with the movement of the liquid column and the time to reach the maximum pressure in the well. Error in the determination of time can significantly reduce the efficiency of gas-dynamic stimulation.

The known method of gas-dynamic fracturing, including the Assembly of planar sectional charge with the Central channel and the container in the Central channel with substances for the treatment of a reservoir, cracks and fixing cracks, the installation charge in the borehole so that the sections of the charge was opposite the perforations and gaseous products of combustion sections of the charge acted directly on the processed layer, the burning sections of the charge with the formation of cracks in the layer (see, for example, patent RU 2278252, 20.06.2006).

In accordance with the known solution simultaneously with the fracturing carry out the fixing of cracks, for example, sand. The disadvantage of this method is its complexity in multiple delivery in the interval of the impact of the container with various substances for the development and treatment of cracks, and then to consolidate the cracks. Install sections of charges opposite the harbour is in the perforations causes abnormalities in the structure of the liquid substance during combustion of the charge and, in addition, leads to inefficient use of energy gases due to the absorption layer in the perforated zone.

The technical result of the invention is to increase the filtration properties of the layer throughout its thickness due to the disclosure and/or a vertical cracks that do not require fixing, in an area larger than the radius of clogging area.

Required technical result is achieved by the method of gas-dynamic fracturing involves the Assembly of the generator pressure in the form of a group of cylindrical charges of solid fuel with a Central through-channels, the slope generator pressure on the suspension into the well, filled with borehole fluid, the generator pressure at a given depth in the borehole, the signal is applied to the ignition of the charges and fracturing. According to the invention the pre-existing casing of the well, the density of perforations provide 30-45 holes per linear meter, which re-perforation, the Assembly of the generator pressure is carried out on three groups of charges of the solid fuel with the location of the charges of the first group below charges of the second and third groups, set the generator pressure in the well above the perforated interval in such a way that the ratio of the distance between the top edge of the perforation and the bottom dawn the ohms of the first group to the length of the perforation interval is a value in the range of 0,3-0,6, the first group of charges has at least one charge igniter and the total estimated mass of all charges, providing the possibility of ignition upstream of the charges of the second group select the maximum diameter of the conditions of permeability in the well bore, with the developed surface of the combustion and therefore emission during combustion, which provides disclosure of existing vertical fractures in the reservoir and the combustion initiation upstream of the charges of the third group, which is selected from the conditions for the creation of a pressure pulse with the amplitude and the duration of combustion of these charges, providing an irreversible deformation of the rock formation with the formation of the residual, at least one of a vertical crack.

In addition:

as the suspension for the descent of the generator pressure in the borehole using a cable or wire, or geophysical cable, or string of pipe;

ignition of the charge of the first group carry out a detonating cord, installed in the Central channels of the charges;

ignition of the charge of the first group perform pyrotechnic igniters installed in the Central channels of the charges;

re-perforation is carried out with the angle phasing shaped charges not more than 60°;

before descending generator pressure in the borehole at Tanglewood acid bath with the active fluid with acid or with surface-active substance, in the interval of the reservoir;

in the pressure generator included charges through channels arranged symmetrically with a Central through-channel;

if the additional well layer, at least one, the treatment is carried out sequentially from the bottom up, starting with the underlying layer;

on suspension set the device to register the pressure in the well at a safe distance from the generator pressure.

The invention

Unlike the prior art, the invention allows to control the process of education in the formation of vertical cracks with regard to the short duration of the process of power stimulation, characterized by combustion of a charge of solid fuel in the well. The time of such exposure, leading to irreversible deformation of rocks and the formation of residual cracks, according to the register pressure in the well and the calculations can be from a fraction of a second to 4 seconds. Therefore, it is necessary to take into account that the density of the perforations of the well and the location of the charge of solid fuel relative to the perforated interval affect the rate of injection of fracturing fluid into the reservoir and on the energy efficiency of combustion products. Essential increase of the density of the perforations meant to the th, necessary to reduce the hydraulic resistance during injection of a fluid into the reservoir, installation of solid fuel charges at the optimal distance from the perforated interval and the charge separation into three groups with different functions, as well as the location of the charges of each group relative to each other and their ignition.

To reduce the hydraulic resistance during injection of fluid from the well into the formation through the perforations it is necessary that the total area of the holes of the perforation in the casing string was not less than the cross-sectional area of the well

φn·N·S0≥S,

where:

φ=0,60-0,62 - coefficient of discharge through the perforations in the casing (depends on the Reynolds number);

n is the density of the perforation;

N - power reservoir;

S0=πd2/4 - the cross-sectional area of the inlet perforations of diameter d in the casing;

S=πD2/4 - the cross-sectional area of the bore with an inner diameter D.

From the ratio of the minimum density perforation:

n=S/(φS0H)=D2/(φ·d2·H).

According to tests, the most effective impact this technology can have on the reservoir, the capacity of which not more than 5÷6 m because of the short duration of the exposure process and the energy loss products what s burning on post lift downhole fluid. When the diameter of the perforation holes of 10 mm and the minimum internal diameter of the casing 100 mm from the above ratio of the density of perforation was within 27÷32 resp./M. These values of density of perforation are the lowest, as when power is reduced formation or increase of the internal diameter of the casing optimal density of perforation, as follows from the above correlation increases. Measurements in wells showed that the qualitative adhesion of cement to casing and rock burning solid propellant charge in the perforated interval with density 12-45 resp./m leads to a local increase in pipe diameter 2-4 mm in this interval without compromising continuity. Therefore, the total density of the perforations should not exceed 45 resp./m Thus, the optimum density of perforation, it is advisable to take within 30 resp./m to 45 resp./m

You can handle the reservoirs with a capacity greater than 5÷6 m With increasing layer thickness the optimal density of perforation, as follows from the above ratio decreases, but the probability of crack formation height equal to the layer thickness decreases.

After ignition of the charges of the first group, the combustion products ignite the charges of the second group. In this stage raskriti the existing vertical fractures of the reservoir, at least, or rupture areas of the reservoir between the perforation channels - primary education bilateral vertical cracks (two cracks in the opposite direction from the axis of the borehole). Estimate approximately the initial volume V0under the assumption of a linear change of the crack opening:

V0=2·L·N·(d/2)=L·N·d

where L is the crack half-length equal to the length of the perforation, N - formation thickness, d is the diameter of the perforation holes.

This volume it is advisable to fill the borehole fluid, as the fluid has a good wedge action. The volume of liquid of height h in the well with the cross-section S is equal to Vc=h·s. When equal volumes Vc and V0relative value:

h/H=L·d/S.

If the charges will be installed at a distance h from the top of the perforated interval in accordance with this ratio, then the formation of the initial cracks it will be completely filled with liquid, and then expanding the crack will penetrate the combustion products and liquid-gas mixture. Taking the average values of length L=50 cm and diameter d=1 cm, calculate the height h of the liquid in the well for two extreme values of the cross-section of the borehole, the most suitable for the application of this technique:

- the inner diameter of the bore 100 mm, S=78,5 cm2h/H=0,64;

the inner diameter of the hole 150 m is, S=176,6 cm2h/H=0,283.

Thus, the accepted optimum relative distance between the top of the perforated interval and the lower charge of the first group within:

h/H=0,3÷0,6.

For example, when the layer thickness H=5 m, the optimal value of h=1.5-3 m, and at a power of N=2 m is h=0.6 to 1.2 m, depending on the internal diameter of the well. Large values of the diameter of the hole correspond to smaller values of the relative distances. Installation charges above the perforated interval of the above limits is impractical, since the energy of combustion products will be used less full because of the short duration of the process and the distance from the target.

The charge separation into three groups and their gradual ignition allows you to make the most effective impact on the reservoir. Each group of charges performs certain functions - ignition charges, creating pressure in the well, sufficient disclosure of the existing vertical cracking or fracturing (initial) and pressure required for permanent deformation with the creation of residual vertical cracks at least one of the specified length and do not require fixing.

Such distribution functions provide the location of the charges of each group relative to each other, the number of charges in cartographe and their geometrical dimensions.

The charges of the first group have lower charges of the second and third groups, and intend to ignite upstream of the charges. Ignition of all of the charges of the first group are performed simultaneously. This operation is performed either by a detonating cord or a pyrotechnic igniter, which is placed in the Central channels of the charges. The products of combustion of the charge of the first group, moving up, ignite the charges of the second group, and the charges of the third group ignite the combustion products of the charges of the first and second groups. Experiments have shown that the total mass of the charges of the first group within 3-4 kg provides reliable ignition of the charges above. This scheme ignition suitable for use in various geotechnical conditions and simplifies the technology work on the wells.

The charges of the second group is intended to create in the borehole pressure, providing at least the disclosure of existing vertical cracks or initial fracturing between the perforation channels - education initial vertical crack.

Based on a large statistical material when conducting fracturing proposed the following approximate values (Shurov V.I. Technology oil production. - M.: Nedra, 1983, p.157):

for wells with depths up to 100 m burst pressure

Pp=(1,74÷to 2.57)Ph,

for wells deeper than 1,000 m burst pressure

Pp=(1,32÷1,97)Ph

where Rh- the hydrostatic pressure of the liquid column whose height is equal to the depth of the layer.

To ensure a high probability of fracturing, it is advisable to take the maximum burst pressure:

Pp=2.57 m·Phfor depths up to 1000 m; Rp=1,97·Phfor depths greater than 1000 meters

Ignition of the charge of this group is carried out in the upward direction in accordance with movement of the products of combustion of the charge of the first group. The combustion front gradually covers the outer surface charges and the inner surface of the Central through-channels. For fracturing crucial has an outer diameter of the charges. With the increase of the outer diameter surface of the combustion increases in proportion to the diameter and is provided intensive getperiod in the hole required for this stage. The maximum diameter is selected to meet the internal diameter of the casing to ensure the patency of the charges during the descent into the well. This group can be included charges through channels arranged symmetrically with a Central through-channel. This allows you to increase the speed of the inflow of gases into the borehole to ensure that the pressure times the IVA reservoir at greater depths. After completing an initial fracture fluid gap in the reservoir will flow gas-liquid mixture of combustion products and borehole fluid.

The charges of the third group intends to create a pressure pulse with an amplitude of providing irreversible deformation of rocks and formation of residual cracks, at least one that does not require fixing. The outer diameter and the total length of the charges of the third group is chosen for the development of the initial crack to a predetermined value and to ensure the irreversibility of the deformation of rocks at its unloading.

When irreversible deformation of rock full deformation is the sum of elastic εeand plastic εscomponent:

ε=εes.

Will approximately be considered as the whole line load to a direct stress σ with modulus of deformation E1=σ/ε, and the line discharge line with modulus of elasticity E2=σ/εe. Then the ratio of these modules:

k=E2/E1=ε/εe.

The plasticity coefficients k, defined as the ratio of total deformation to strain to elastic strain for Sands, are within 1.5÷5, and limestone within 1,5÷10 (Kashnikov Y.A., Ashikhmin YEAR, rock Mechanics in the development of hydrocarbon deposits. - M.: Nedra, 2007, p.35).

Shows th the crack after removal from its circuit constant load is not closed completely and there will be a residual crack when the following conditions (P. Zheltov Deformation of rocks. - M.: Nedra, 1966 : 87):

where P is the pressure on the contour of the crack, R0- reservoir pressure, qside rock pressure, k=E2/E1.

To estimate the pressure P, leading to the formation of residual cracks, take the reservoir pressure and the side of the mountain is equal to the hydrostatic pressure of the liquid column Phwhose height is equal to the depth of the reservoir. When k=1.5 to get an approximate estimate of the pressure in the well for the formation of residual cracks P=4·Ph; when k=5, the pressure P=2,25·Ph; when k=10 pressure P=2,1·Ph. Given the large variation of physico-mechanical properties of rocks, you can take the maximum estimate of the pressure P=4·Phas the most reliable for the formation of residual cracks in reservoirs of different types. Thus, for the formation of residual cracks well pressure must be greater than the hydrostatic pressure of the liquid column whose height is equal to the depth of the reservoir, 4 times or more. Selection pressure associated with the state of the lining of the well (with the quality of adhesion of the cement to the casing in the treatment area).

The combustion front charge of this group extends upward along the outer surface and the Central channels, as for the charges of the second group. To ensure the necessary the th pulse pressure determines the value already has the total length of the charge of this group. The outer diameter of the charges of the third group should be no larger than the outer diameter of the charges of the second group. In this group, along with single charges can enter and also charges with a through longitudinal channels arranged symmetrically Central.

The parameters of all groups of charges determined by mathematical modeling of processes in the borehole during combustion of the charge.

The distribution of the different functions between the charges of the three groups allows you to create residual crack of a given length to overcome areas of degraded permeability around the well and, therefore, increase the filtration properties of the productive formation outside the zone of sedimentation.

Ignition of the charge of the first group can be accomplished by initiating the detonating cord, which is passed through the Central through-channels of the charges. Upon detonation of the cord into the charges formed microcracks. The products of detonation ignites the charge, as in the Central channels and the surfaces of microcracks. When using pyrotechnic igniters charges ignite on surfaces of the Central channels. In both cases, further ignite the side and the end faces of the charges, but with different speeds. Choosing one or the other means of ignition, it is possible to control the pulse pressure in the well, given that the processing of the layers occurs at different depths at different hydrostatic pressures.

It is established that the optimum angle phasing in secondary perforation should be no more than 60°. This increases the probability distribution of cracks at break along lines of perforation. In this case, reach the minimum pressure at the beginning of the gap and the maximum communication of fluid between the perforation holes and cracks. As the crack propagates perpendicular to the minimum stress in the rock, it is most likely that the formation of two cracks in opposite directions from the axis of the borehole, i.e. bilateral crack.

When working in complex with active liquids, such as solutions of acids (hydrochloric, pinacolato and others), or with solutions of known surface-active agents (surfactants) type disolve, several, sulfamyl, is heated and active displacement fluid into the formation during combustion of the charge. Acid and surfactant-processing technologies are well developed for all types of collectors, can significantly expand and increase the length of the cracks.

When processing layers, located at great depths, can be applied, along with single-channel charges, and also charges with a through longitudinal channels arranged symmetrically to the Central channel. Surface combustion of such charges is greater than the charges with a single Central channel that provides in order to ensure that the amplitude of the pressure within wide limits and create a well in high pressure, required for the formation of cracks at greater depths.

In case of additional layers in the well - multiple spaced layers on the well depth, the treatment should be carried out according to the following scheme. First handle the lower part. Then move successively to the next overlying layer. This sequence is explained by the fact that the pressure in the bore between the shaft and charges is greater than the pressure above charges. Therefore, the gap is more likely in the underlying layers. Determining the number of charges in the groups for each treatment, take into account that the effects of being increased capacity of the reservoir is equal to the sum of the capacities of reservoirs.

If the processing is carried out in reverse order, starting with the upper reservoir, it is unknown what the underlying seams would burst. Therefore, when determining the number of charges occurs uncertainty.

An example of the method

You may want to improve the filtration properties of the formation (limestone) with a capacity of 6 m at a depth of 2500 m, perforated with a density of 20 resp./m and a diameter of the perforation holes in the casing string d=10 mm, an Inner diameter of the hole D=120 mm, the Quality of adhesion of the cement casing is good. The hydrostatic pressure of the liquid column whose height is equal to the depth of the layer of P =25 MPa. According to hydrodynamic studies radius of the zone of diminished permeability of the reservoir is known. Using geological and technical data on the well, carry out the following preparatory calculations.

From the relation for the minimal density of perforation follows:

n=D2/(φ·d2·N)=144/(0,62·1·6)≈39 resp./m

For the first group select three charge with a total weight of 3 kg, with an external diameter of 42 mm, length 500 mm, internal end-to-end channel with a diameter of 15 mm under the cable and detonating cord.

The distance h from the top of the perforated interval to the lower charge of the first group, in accordance with the above ratio (D=120 mm, S=11304 mm2L=500 mm, d=10 mm), should be:

h/H=L·d/S=500·10/11304≈0,44;

h=6 m·0,44≈2,6 m

The diameter of the charges of the second group is chosen to ensure patency during the descent into the well. In this case, choose the charges with an outer diameter of 95 mm using mathematical modeling to determine the number of charges of the second group to create a pressure fracturing between the perforation channels. Because treatment is carried out at a depth of more than 1000 m, the burst pressure must be 1.97 times the hydrostatic pressure of the liquid column whose height is equal to the depth of layer:

Pp=1,97·Ph=1,97·25≈49 MPa.

Using mathematical modeled what I define an outer diameter and the total length of the charges of the third group, creating a combustion pressure pulse with amplitude

P=4·Ph=4·25=100 MPa

and duration sufficient to generate residual cracks, the length of which is greater than the radius of the zone of degraded permeability zone sedimentation around the well.

After preparatory calculations begin to work on the well.

Produce additional, secondary perforation of wells in a given interval. Set the detonating cord in the Central channel of the charges of the first group. Produce Assembly and fixation of all groups of charges on a logging cable, the descent of the entire Assembly into the hole on the calculated distance from the perforated interval. Serves electrical signal to initiate the detonating cord.

The products of combustion of the charge of the first group, moving up, ignite the charges of the second group, and the combustion front moves upward along the outer surface charges and the Central through-channels. Created by well pressure provides fracturing between the perforation channels and filling this space borehole fluid. The charges of the third group ignite developed by the flow of gases moving upward along the outer surface and the inner through-channels of the charges of the third group. At this time in the reservoir begins to penetrate the gas-liquid mixture and combustion products. The pressure is on the edge of the fissure create irreversible deformation in rocks and lead to the formation of residual cracks.

Compare the results of calculations of the parameters of the pulse pressure in the well with the parameters recorded by the downhole tool, and make a conclusion about the result of the stimulation.

1. The method of gas-dynamic fracturing, including the Assembly of the generator pressure in the form of a group of cylindrical charges of solid fuel with a Central through-channels, the slope generator pressure on the suspension into the well, filled with borehole fluid, the generator pressure at a given depth in the borehole, the signal is applied to the ignition of the charges and fracturing, wherein the pre-existing casing of the well, the density of perforations provide 30-45 holes per linear meter, which re-perforation, the Assembly of the generator pressure is carried out on three groups of charges of the solid fuel with the location of the charges of the first group below charges of the second and third groups, set the generator pressure in the well above the perforated interval in such a way that the ratio of the distance between the top edge of the perforation and the lower charge of the first group to the length of the perforation interval is a value in the range of 0.3 to 0.6, while the first group of charges has at least one charge igniter and the total estimated mass of all charges, providing the possibility of the activity of ignition upstream of the charges of the second group, choosing the maximum diameter of the conditions of permeability in the well bore, with the developed surface of the combustion and therefore emission during combustion, which provides disclosure of existing vertical fractures in the reservoir and the combustion initiation upstream of the charges of the third group, which is selected from the conditions for the creation of a pressure pulse with the amplitude and the duration of combustion of these charges, providing an irreversible deformation of the rock formation with the formation of the residual, at least one of a vertical crack.

2. The method according to claim 1, characterized in that as the suspension for the descent of the generator pressure in the borehole using a cable or wire, or geophysical cable, or string of pipe.

3. The method according to claim 1, characterized in that the ignition of the charges of the first group carry out a detonating cord, installed in the Central channels of the charges.

4. The method according to claim 1, characterized in that the ignition of the charges of the first group perform pyrotechnic igniters installed in the Central channels of the charges.

5. The method according to claim 1, characterized in that the re-perforation is carried out with the angle phasing shaped charges not more than 60°.

6. The method according to claim 1, characterized in that before descending generator pressure in the well is placed in the interval active layer liquid is t - solutions of acids or surfactants.

7. The method according to claim 1, characterized in that the generator pressure is included charges through channels arranged symmetrically with a Central through-channel.

8. The method according to claim 1, characterized in that in the presence of the additional well layer, at least one, the treatment is carried out sequentially from the bottom up, starting with the underlying layer.

9. The method according to claim 1, characterized in that the suspension set the device to register the pressure in the well at a safe distance from the generator pressure.



 

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8 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: formation hydraulic fracturing method involving placement into the well interval at the depth of the planned hydraulic fracturing and above it of water-based gel of "Khimeko-V" complex with strong granular substance with fraction of 0.4-0.8 mm in the suspended state; placement in the well above the above said water-based gel of process liquid with density of 1.8-2.0 g/cm3; reduction of the level of well liquid to the level of 150-190 m from the well head, sealing of well head with possibility of liquid flow throttling and creation of cracks in the formation by means of water-based gel of "Khimeko-V" complex with the energy released at combustion of the charge placed in water-based gel zone of "Khimeko-V" complex and against geological differences of formation rocks and/or their disturbances; at that, total volume of water-based gel of "Khimeko-V" complex is assumed on the basis of 0.3-0.4 m3 per 1 running metre of effective thickness of the formation.

EFFECT: increasing intensification effect of the product inflow from the formation owing to reducing the charge energy losses, increasing the operating safety and improving the effect of stable formation drainage in time.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: method involves placing into the well interval at the hydraulic fracturing and above it of viscous working liquid with propping agent with fraction of 0.4-0.8 mm in the suspended state; placing in the well above viscous working liquid of process liquid with density of 1.3-2.0 g/cm3 and creation of cracks in the formation by means of viscous working liquid with the energy released during the charge burning. The charge is placed in the viscous working liquid zone. At that, the liquid including the following components per 1 m3 is used as viscous working liquid: biocide "Biolan" - 0.005-0.007 l; gelling agent "GPG-3" - 4-5 kg; borate binding agent "BS-1" - 3-4 l; surface active substance - destruction modifying agent "KhV" - 1-3 l; propping agent - 100-300 kg; water is the rest.

EFFECT: increasing intensification effect of the product inflow from the formation owing to reducing the charge energy losses, increasing the operating safety and improving the effect of stable formation drainage in time.

3 cl, 1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: according to accelerated variant, perforation of well-adjacent bed zone is performed by cased cumulative perforator. Adjustable pulse gas-dynamic bed fracturing is performed through apertures of perforator. It is provided with subsequent operation in given time of delay of main and additional gunpowder chambers. Thermal gas-chemical effect on well-adjacent zone of bed is provided for in given delay time of thermal gas-chemical chamber with charges. Implosion treatment is performed in given delay time of implosion chamber. Treatment is set by volume of implosion chamber and size of pass cross-section of flow aperture and/or group of apertures, connecting inner volumes of chambers.

EFFECT: higher efficiency.

12 cl, 3 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling long horizontal wells in bed and effecting on bed through them. Most of bed is covered by these wells. Along whole length of them explosive substance is placed to provide explosion temperature for length unit of well from 3500 to 1400 kcal/m and filling volume of horizontal wells by explosive substance from 5 to 20% during filling of remaining wells volume by liquid. After explosion, a packer is lowered into cased portion of wells.

EFFECT: higher efficiency.

3 cl, 1 tbl, 1 dwg

FIELD: mining industry.

SUBSTANCE: device has collapsible body of at least two portions. These are held relatively to one another, have a combined axial channel and together form a hermetic ring-shaped hollow. Therein a ring-shaped cumulative charge is placed with pressed explosive substance in metallic case in form of a torus, having outer ring-shaped recess. Opposite to the latter body is made with lesser thickness of outside wall. Body has at least one inner radial channel, connecting ring hollow to axial channel. In this axial channel a means for initiating ring-shaped cumulative charge through radial channel is positioned. Portions of body are mated by ends adjacently to each other and made with possible exclusion of strains from axial loads in zone of outer wall of decreased thickness under well conditions.

EFFECT: higher reliability and efficiency.

3 dwg

FIELD: oil industry.

SUBSTANCE: method includes lower heat energy source and implosion chamber into well. Heat effect is applied and phase-explosive process is launched by opening implosion chamber. Implosion chamber is opened after reaching maximal temperature of well liquid at the very beginning of its decrease. Then phase-explosive process launch temperature is decreased. At second object method includes lower heat energy source and air implosion chamber into well. Heat effect is applied and phase-explosive process is launched by opening air implosion chamber. Air implosion chamber is positioned at distance from heat energy source, where well liquid temperature provides for launch of phase-explosive process, or air implosion chamber is opened with a delay. By these, excessive energetic potential of phase-explosive process is prevented with destruction of casing column and cement stone. Power of phase-explosive process is limited by use of air chamber under pressure.

EFFECT: higher efficiency.

2 cl

FIELD: oil and gas industry.

SUBSTANCE: method includes placement of deep operation body in perforation zone, capable of forming pressure pulses via remote initiation of gas mixture explosions. Depression of bed is performed by lowering liquid level in a well, forming a certain volume of explosive gas mixture in deep body, performing multiple effect on bed without raising of body until well product influx increases. Explosion pressure is set on basis of hydrostatic pressure of well liquid and volume of explosive gas mixture on basis of table provided in description.

EFFECT: higher efficiency.

1 tbl

FIELD: oil-and-gas field development.

SUBSTANCE: method involves forming continuous disc-shaped slot in well by successive blasting gunpowder charges along with increasing power thereof in trinitrotoluol equivalent from explosion set to explosion set as slot length increases and strengthening the slot. The slot is formed so that aperture and radius thereof are related by analytical correlation.

EFFECT: increased ability of oil and gas extraction.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes placing an explosive device in a well in working gas-liquid substance, occupying also the volume of well below perforator and above it at distance 10-300 meters. At upper mark of gas-liquid substance viscous-resilient liquid is placed with height of hydrostatic column 10-50 meters. Above viscous-resilient liquid main volume of gas-liquid substance is placed with relation of gas and liquid therein being less, than in working gas-liquid substance below viscous-resilient liquid. Density of main volume of gas-liquid environment is taken for calculation of forming of necessary depression in well shaft. With that depression, after gathering of structural viscosity by viscous-resilient liquid, explosion is performed.

EFFECT: higher efficiency.

14 cl, 1 ex

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

FIELD: oil production, particularly to stimulate bottomhole zone contaminated with paraffin, asphaltic resinous, salt, sludge and other deposits to increase oil output.

SUBSTANCE: method involves combusting solid fuel charges in well and creating successive excessive pressure pulses of gaseous combustion products. Solid fuel charges are combusted simultaneously with providing periodical stepped change in area and combustion temperature along with performing control of gas entering into well. This provides excessive pressure pulses which occur with frequency corresponding to time fractal processes of fatigue crack propagation in geological bed environment and creates pressure oscillations with 0.5-800 hertz frequency. The pressure oscillations act upon bed matrice material, as well as upon fluids and mud filling it.

EFFECT: increased efficiency due to increased coverage of elastic vibration application, reduced power inputs, creation of favorable conditions for nonreversible crack-propagation process and for providing purposeful triggering action.

24 cl, 4 dwg

FIELD: oil production, particularly to penetrate oil formations characterized by low filtration characteristics.

SUBSTANCE: method involves applying gaseous medium pressure action to formation within productive zone interval, wherein the gaseous medium is obtained from reaction between oxidizing agent and fuel, which are self-ignited once brought into contact. The oxidizing agent is halogen fluoride or derivatives thereof or nitronium perchlorate. The fuel is formation fluid. Contact between the oxidizing agent and the formation fluid is provided by supplying the oxidizing agent into the formation in impulse mode. The oxidizing agent supplying is carried out in shots performed by gun or gas-jet perforator provided with bullet and oxidizing agent or with conical casing and oxidizing agent.

EFFECT: possibility to combine well perforation operation with crack forming (formation breakdown) operation and, as a result, increased ability of formation treatment.

4 cl, 2 tbl, 2 dwg

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