Hydrocarbon stimulation production technique

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to the oil industry and may be used for the stimulation of hydrocarbon production, in particular, of an oil or gas condensate, in wells, increase in their recovery factor due to the treatment of the bottomhole zone of this production formation penetrated by wells included into the formation development. According to the technique, wellhead sealing is performed. Then the well is shut down by the injection of a fluid blocking inflow from the productive formation. At the initial phase an excess pressure is generated in the well so that it exceeds the hydrostatic pressure of the fluid column affecting the productive formation per a preset value. The pressure in the well is increased further with the generation of pulse series of pressure increase in the mode of resonant oscillations with the preset frequency. Then the blocking fluid in the well is replaced by an operating fluid with the simultaneous generation of the pulse series of pressure increase in the well. The operating fluid is flushed to the productive formation at maintaining the pulse impact mode for the productive formation at another frequency differing from the earlier preset frequency until the pressure increases further in the productive formation at the final phase up to a preset value. Thereupon the pressure is decreased sharply in the well by pulse series with the provision of a break in integrity of a hydraulic medium in the productive formation zone. At that time intervals between the pulses in operations with the pressure increase are accepted as different from the time intervals between the pulses in operations with the pressure decrease.

EFFECT: increasing the production rate and reaching an initial value of the bottomhole zone permeability due to opening of a fracture network in the productive formation with prevailing vertical fractures, increasing mass exchange in the filtration zone and reliability of the filtration zone cleanup from products of man-made colmatation.

9 cl, 1 dwg, 1 ex

 

The invention relates to oil industry and can be used for enhanced recovery of hydrocarbons, in particular oil or gas in wells - increase the rate of extraction from the reservoir at the expense of processing bottom-hole zone of the reservoir, uncovered wells involved in the development of the formation.

The known method of intensification of production of hydrocarbons involving the use in the well of the column tubing, the device with the cylinder, is made with radial Windows, a piston in the cylinder and the radiator to the cylinder. Using the device for generating pressure pulses through the use of energy of the liquid column filling the borehole (see RF patent №2490422, 20.08.2013).

The disadvantage of this method is its limited capacity for intensification of oil production, due to insufficient energy of the impact on the reservoir.

The known method of intensification of production of hydrocarbons, according to which carry out consecutive gas-pulse processing of the productive formation in the zone of perforation by the impact of pulse pressure with a predetermined energy and duration of the oscillations of the shock wave until they decay, and then generate pressure pulses with less energy, but at a certain cha�tote oscillations (see patent RF 2105874, 27.02.1998).

The disadvantage of this method is the lack of productivity of wells in the extraction of hydrocarbons, due to the lack of integrated effects on the bottomhole zone of the productive formation is composing its rocks and saturating his fluids, including those introduced in the development process, the lack of increase of permeability of the reservoir, impacts on the area colmatation.

The technical result of the invention is to increase factor productivity and the achievement of the initial permeability of the bottomhole zone of the formation in wells due to opening of the network of cracks in the productive layer with the prevalence of vertical fissures, increasing the mass transfer in the zone of the filter and secure cleaning of filtration area from technogenic products colmatation.

The required technical result is achieved in that a method of enhanced recovery of hydrocarbons includes a well bore fluid, temporary preservation of the well by putting fluid in it blocking the flow of fluid from the reservoir creation in the well of excessive pressure in the initial phase, exceeding the hydrostatic pressure of the liquid column acting on the reservoir, to the preset value, a further increase in pressure in the well with a series impulse�to increase the pressure in the resonant mode of oscillation at a given frequency, subsequent replacement of the blocking fluid into the wellbore on a working fluid with simultaneous creation in the well series of pulses of increasing the pressure, prodavcu the working fluid in the reservoir, maintaining the pulse mode effects on the reservoir on a different frequency than a previously specified, to further increase the pressure in the productive layer in the final stage to the set value, followed by a sharp decrease in the pressure of a series of pulses with the provision of a rupture of continuity of the hydraulic medium in the zone of the productive layer, wherein the time intervals between pulses in operations with increasing pressure to accept than the time intervals between pulses in transactions with decreasing pressure.

In addition:

the pressure in the initial phase we create the excess of the hydrostatic pressure of the liquid column acting on the reservoir, 30-40%;

series of pulses of the pressure increase in the resonant mode of oscillation is carried out with a frequency of 0.2-1 Hz;

the pressure to create the final phase exceeds the hydrostatic pressure of the liquid column acting on the reservoir, 50-70%;

the pressure in the borehole is being created with the use of an inert gas;

inert gas is pumped into the upper part of the borehole;

the excess pressure created with the help �nematicheskogo generator of pressure pulses;

as a working body of the pneumatic pulse generator pressure using an inert gas;

as the inert gas using nitrogen or helium.

The invention consists in the fact that well prepared for the full impact on the reservoir. To do this, she will be transferred to a conservation regime with the fix in it blocking the liquid. As a blocking fluid is used, for example, solutions of calcium chloride or magnesium with additives, for example, gidrofobiziruyuschimi or hydrotribromide the pores of the productive formation depending on the conditions. Then in the initial phase in the well smoothly (statically) increase the pressure in excess of hydrostatic, with simultaneous evaluation of the response of the productive formation to the pressure. If necessary, change the dynamics of the pressure build-up. Bring the pressure to the set value, for example, by 30-40%, exceeding hydrostatic pressure. As a result, in the zone of the productive layer form an extensional stress state of the rock. Then carry out a further increase in pressure in the well, but by creating a series of pressure impulses - of the dramatic increase in pressure. Impulsive effects on the volumetric intense zone of the productive formation provides the initiation of a dense network of natural fractures of the productive formation. Required�tion of oscillations, resonant with productive reservoir, provides the initiation of the vertical cracks of the productive formation in the network, and with their dominance, which is especially important for the productive strata, divided by interlayers with different filtration properties. In this case, the resonant mode of the pulse oscillation is carried out with a specified frequency, providing volumetric activation of the pores and cracks of the productive formation. The continuation of the impulse of the impact when changing the blocking fluid into the wellbore on a working fluid provides the possibility of destruction of the structure of the blocking fluid and prepare it for removal from the reservoir, it inevitably received in the preservation of the well. It is important to further increase the pressure in the productive layer on the final phase in the environment of the working fluid to the set value that is a kind of pumping of the productive formation potential energy to the set value, for example, 50-70%, exceeding hydrostatic pressure, and at a different frequency of oscillation. At this pressure, the previously initiated cracks are disclosed more fully and ready for processing a working fluid. As the working fluid used in the solutions of acids, for example hydrochloric or hydrofluoric, or solvents, for example alcohols or Stroger�Yes. The transition to a different frequency of oscillation provides a violation of the previously given system state, which became conditionally stationary with the usual channels of filtering. Another frequency change the filtration channels and connect zones of difficult drainage, i.e. place the system in a larger state mass transfer in the zone of filtration. Next on the wellhead carry a sharp decrease in pressure in the well series. Previously created potential energy of a predetermined value and sharp provide release break the continuity of the hydraulic medium in the wellbore and the zone of the productive formation. As a result of rupture of the continuity of the hydraulic environment of the cavity formed with low blood pressure. In these cavities receive the bridging agents of the bottomhole zone of the reservoir, the decay products of the blocking fluid and asphaltene deposits.

The time intervals between pulses in operations with increasing pressure and in operations with reduced pressure are taking excellent from each other to further deepen the nonstationarity of the system and the institution of new channels filter with additional sources of mass transfer. At the same time provide the possibility of a continuous adjustment of the system oscillations in optimal and, in particular, the resonance mode in the entire process �realizatsii way. When the frequency of following of pulses superimposed on each other, preventing, for example, the resonance of the system or compensate for each other. If the following pulse wave rapidly subside without producing the necessary impact on the reservoir. Excitation of resonance oscillations of the liquid column in the well under non-stationary - a constantly changing state of the system ensures the processing efficiency of the near-well zone of the reservoir.

When pulse action compresses the liquid column with subsequent unloading. To compress the liquid column may be used an inert gas. It can be injected into the upper part of the pre-sealed wells as in the smooth increase of pressure and in pulse mode. The gas with elevated fluid properties provides the possibility of a sharp pulse of pressure reduction in the wellbore, for example, via the valve at the wellhead with ball valve. For pulsed exposure may be a pneumatic pulse generator pressure. With its usage rate of the working gas on one influence is usually from 10 DM3up to 50 DM3at initial pressure of 10.0-15.0 MPa. The generator is mounted on the wellhead, provide hydraulic communication with casing pipe, m�trubnik space or pump-compressor pipes (tubing), filled with an appropriate liquid. The generator uses the energy of compressed gas to an abrupt load hydrostatic pressure of the liquid column in the upper part. The liquid in the tubing is used as a waveguide and as an oscillating system, which together provides at the bottom of the hydrostatic fluid column pressure fluctuations around the hydrostatic. The front of the first two pulses of increasing and decreasing pressure - the actual oscillatory process as a response to the pulse pressure variation, shock character has. Subsequent oscillations have a relatively smooth character, and their frequency (f0) is determined by the expression:

f0=C/4HoHz,

where Ho- the length of the liquid column in the tubing;

C is the speed of sound in the borehole fluid.

In Fig. 1 shows the diagram of the propagation of pressure impulses under the influence of pneumatic pressure generator in the borehole with casing tubing, cement bridge at a depth of 1270 m and uncovered cumulative perforation of the productive formation. Unloading mouth from excess pressure is produced at the moment of maximum compression of the fluid in the borehole, which in this case corresponds to the travel time of the pressure wave from the mouth to the bottom and back. At initial pressure of the compressed gas 10 MPa maximum pressure at the mouth was 4 MPa, and the bottomhole formation zone atlevel productive stratum - 6,1 MPa, due to the addition of incident and reflected pressure waves produced from the pressure pulse. The maximum amplitude of the pulse pressure decrease in the critical zone was 4.2 MPa. The number is quite intense pressure reaches 8-10, then their amplitude is 30% of the original.

The amplitude of the pulse pressure decrease in the critical zone is determined by the pressure level Pkat the moment of maximum compression of the fluid in the well. Provided that the generator provide the Pk=(0.5 to 0.7)Pgwhere Pg- hydrostatic pressure at the face. The level of reduction in pressure reaches the hydrostatic pressure, and with further increase in Pkat the critical zone, there is a gap in the continuity of the hydraulic environment of the well.

Pk=(0.5 to 0.7)Pgbreaks the continuity of the hydraulic medium to see the third oscillation of the liquid column in the well. During the period of reduction of pressure in excess of hydrostatic pressure on the bottom, begins a chaotic formation and collapse of cavities razva the continuity of the hydraulic medium.

A major factor in the destruction of rocks of bottomhole formation zone is the shock transmitted through the borehole fluid column when loading and unloading the wellhead, and break the continuity of the hydraulic�certification environment at the bottom area of the productive formation during the fall in pressure below hydrostatic.

To achieve the latter effect mentioned above, the generator must have an adequate supply of compressed gas, which ensures the maintenance of excessive pressure on the mouth to a value of Pk=(0.5 to 0.7)Pg.

A sharp decrease in pressure in the well can be achieved with application of negative pressure generator, which is placed in the lower part of tubing in the zone of the productive formation.

An example implementation of the method

At the initial stage of the processing cycle is extracted downhole equipment and tubing is lowered to the bottom, for example, with a pulse generator of negative pressure at the end. The well to the mouth fill with locking fluid such as a solution of calcium chloride and viscoelastic composition - MAS in its lower part. Thus, by placing in the wellbore fluid, which is blocking the flow of fluid from the reservoir is carried out temporary conservation of the well. Create in well excess pressure in the initial phase, exceeding the hydrostatic pressure of the liquid column acting on the reservoir, 30%, than place the system in volumetric stress state. Then provide a further increase in pressure in the well with a series of pulses of increasing pressure � mode of resonance oscillations. For this exercise the buildup of the system at different frequencies and possibly the amplitude of the control response at resonance. Find the mode with a given frequency, such as 0.5 Hz. Carry out the replacement of a blocking fluid into the wellbore on a working fluid with simultaneous creation in the well series pulse pressure increase. Are prodavcu the working fluid in the reservoir, maintaining the pulse mode effects on the reservoir, but on a different frequency, for example at a frequency of 1 Hz, to further increase the pressure in the productive layer in the final phase to a value that exceeds the hydrostatic pressure by 70%. After that, perform a sharp decrease in the pressure of a series of pulses with the use of negative pressure generator with provision of a rupture of continuity of the hydraulic medium in the zone of the reservoir conditions which previously established a reserve of potential energy in a productive reservoir - excess pressure on the final phase and the abrupt change of events - a sharp etching gas at the wellhead. In this case, the time intervals between pulses in operations with increasing pressure take, for example, 3 minutes, and the time intervals between pulses in transactions with decreasing pressure, take, for example, 5 min, than one non-stationary state of the system�we replace the other non-stationary state of the system, what, in General, increases the mass transfer inside oscillatory system running pressure pulses with a certain sign. In the case of the pneumatic generator is mounted on the wellhead, connect it and the annulus of the well to the drain container. After each pulse, excited in the bottom-hole zone of the reservoir, there is a response in the form of 10-20 gradually damped oscillations of pressure. Not all of them are active. To restore the hydrodynamic connection of the well with the reservoir after its decline in the process of operation is usually sufficient series of pressure pulses in the form of 4-6 influences.

As a result of a complex of the above-described techniques provide an increasing factor productivity and the achievement of the initial permeability of the bottomhole zone of the formation in wells due to opening of the network of cracks in the productive layer with the prevalence of vertical fissures, increasing the mass transfer in the zone of the filter and secure cleaning of filtration area from technogenic products colmatation, washed in the lifetime of the well. While dependent claims affect the claimed technical result by optimizing noted in the description of the phenomena.

Application of the proposed method of pulse-wave effects as possible for extractive and �agnatically wells. In the past due to the pulse-wave effects provide improved throttle response.

1. Method of enhanced recovery of hydrocarbons, comprising a well bore fluid, temporary preservation of the well by putting fluid in it blocking the flow of fluid from the reservoir creation in the well of excessive pressure in the initial phase, exceeding the hydrostatic pressure of the liquid column acting on the reservoir, to the preset value, a further increase in pressure in the well with a series of pulses of the pressure increase in the resonant mode of oscillation at a given frequency, the subsequent replacement of the blocking fluid into the wellbore on a working fluid with simultaneous creation in the well series of pulses of increasing the pressure, prodavcu the working fluid in the reservoir, maintaining the pulse mode effects on the reservoir on a different frequency than a previously specified, to further increase the pressure in the productive layer in the final stage to the set value, followed by a sharp decrease in the pressure in the borehole a series of pulses with the provision of a rupture of continuity of the hydraulic medium in the zone of the productive layer, wherein the time intervals between pulses in operations with increasing pressure than take interweavement between pulses in transactions with decreasing pressure.

2. A method according to claim 1, characterized by the fact that the pressure in the initial phase we create the excess of the hydrostatic pressure of the liquid column acting on the reservoir, by 30-40%.

3. A method according to claim 1, characterized by the fact that a series of pulses of the pressure increase in the resonant mode of oscillation is carried out with a frequency of 0.2-1 Hz.

4. A method according to claim 1, characterized by the fact that the pressure to create the final phase exceeds the hydrostatic pressure of the liquid column acting on the reservoir, by 50-70%.

5. A method according to claim 1, characterized by the fact that the pressure in the borehole is being created with the use of an inert gas.

6. A method according to claim 5, characterized in that the inert gas is pumped into the upper part of the borehole.

7. A method according to claim 1, characterized by the fact that create excess pressure by a pneumatic pulse generator pressure.

8. A method according to claim 7, characterized in that the working body of the pneumatic pulse generator pressure using an inert gas.

9. A method according to claim 8, characterized in that as the inert gas using nitrogen or helium.



 

Same patents:

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3 tbl

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21 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method capital mining operations are carried out on penetration and developing access channels to a productive formation of a deposit. Underground mining and development operations and field operations on the well production of shale oil and gas are performed using multistaged hydraulic fracturing or thermal effect on the formation. A shale oil- and gas-containing deposit is penetrated by vertical shafts. Preparation of the productive formation for hydrocarbon production is carried out by the underground mining and development openings placed below a water-bearing horizon covering the rock above the shale rock of the deposit. Hydrocarbon production is carried out by mining blocks of underground producing wells with horizontal sections protruded in the formation. The producing wells are drilled from underground cells constructed mainly in the mining and development openings. Before complete hydraulic fracturing of the formation small diagnostic hydraulic fracturing of the formation is made in the producing wells of a small diameter, which are drilled mainly from the mining and development openings to the whole thickness of the productive formation transversely to its course. The product of the producing wells is divided in the shaft bottom into shale gas and shale oil. The shale oil is outputted to the surface for further treatment before delivery to consumers. The shale gas is burnt in the boiler of a shaft bottom heat-generating plant to generate water steam or hot water used for the production of electricity or for the purpose of a thermal effect on the productive formation in order to increase intensity and the production rate.

EFFECT: reduced total volume of operations on drilling producing wells while developing shale deposits.

2 cl, 11 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves the use of horizontal holes, the horizontal section of which passes through the oil formation at the minimum distance from the gas cap 1/2 thickness of the oil part. The branch with sealing of annular space directed upwards is formed, with crossing of gas-oil contact and opening of gas saturated part of the formation. Meanwhile the string is perforated with opening of the gas cap in two opposite sections of the well within the target formation. Control of flows of gaseous and liquid fluids in the well between various perforation intervals is performed using the bypasses adjustable from the surface. The well design according to the method allows to perform independent gas recovery in required volumes from two intervals of gas cap opening, that allows independently to monitor the movement of the gas-oil contact and lift the formation fluid to the surface at the expense of natural gas-lift.

EFFECT: increase of level of development of oil stocks by means of control of intraformational cross-flows of gaseous fluid and minimizing of risks of coning, decrease of expenses for lifting of formation fluids to the surface at the expense of natural gas-lift.

6 cl

FIELD: oil and gas industry.

SUBSTANCE: according to the method intervals of a well are completed opposite the gas-saturated part, so called gas cap, and oil-saturated part of a productive stratum. A tubing string is run in to the well. The gas cap is isolated by a packer. Gas is injected to the gas-saturated part of the productive stratum and the product is extracted by a borehole pump. Simulated completion opposite the gas-saturated part of the productive stratum is ensured by the creation of drainage channels oriented radially inward the stratum. Then two coaxially mounted tubing strings of a different diameter are run in to the well. The tubing string with a lesser diameter is run in to the level of the oil-saturated part of the stratum and equipped with the borehole pump connected by an exhaust line to the ground separator intended for the separation of associated gas. The tubing string with a bigger diameter is run in to the level of the gas-saturated part of the stratum and connected to a pressure line of the separated associated gas from the ground gas compressor. Oil is extracted through the tubing string of a lesser diameter. Injection of the separated gas is made through the tubing string of a bigger diameter. At that the separated gas under pressure is delivered to a space between packers in the gas-saturated part of the stratum over gas-oil contact (GOC) thus supporting energy of the stratum at a permanent level. As far as to oil extraction from the oil-saturated part of the stratum and injection of the separated gas to the gas-saturated part of the stratum, GOC boundary is shifted stage by stage as per the thickness of the stratum from its roof to the bottom thus ensuring the gradual oil draw-down rate.

EFFECT: reduced labour costs at implementing associated gas injection to oil wells in order to maintain the reservoir pressure during operation of hydrocarbon deposits and improvement of their productivity.

1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: drilling of new wells or selection of drilled wells is executed. Several pumps are lowered in the well. Note here that in terrigenous or carbonate bed oil afflux to every productive well horizontal hole is predefined. Horizontal boreholes that differ in oil yield by 20% and more are selected. Pumps are lowered on parallel strings in horizontal borehole in length smaller than 300 m. Pumps are lowered on parallel strings in horizontal borehole in length over 300 m. Spacing between pumps does no 30 m. Every horizontal borehole is arbitrarily divided into three sequential sections. Pumps with output 2-10 times higher than that of pumps in section at horizontal borehole end are lowered at the central section.

EFFECT: accelerated oil extraction, uniform development, higher bed oil yield.

2 cl, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: drilling of new wells or selection of drilled wells are executed. Intervals of productive bed are isolated. Pump is lowered in the well. Selected sections are separated by packers. Well products are extracted from every said section. At development of terrigenous or carbonate bed the afflux profile is predetermined. Sections with afflux profile are revealed that differ in specific oil yield by 20% and more. Packers are fitted at points of specific yield variation. One pump is lowered on separate tubing or coiled tubing to the centre of every section. Spacing between lowered pumps over horizontal holes is set not to exceed 200 m.

EFFECT: accelerated oil extraction, uniform development, higher bed oil yield.

2 ex, 2 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes electro-hydraulic treatment of bed at resonance frequency and extraction of oil from bed. According to invention bed is excited by resilient pulses at broad frequency range from 0 to 10 kHz. Frequencies are set, at which bed is treated. Resonance frequency is kept by singular, periodical, radially focused electro-hydraulic pulses with generation frequency, divisible by bed resonance frequency. Concurrently in adjacent well bed excitation frequency is controlled by resilient pulses and corrected according to measurements results.

EFFECT: higher efficiency.

2 dwg

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