Method of intensification of hydrocarbons production using horizontal wells

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry,

namely, to wave technology of combined action on productive formations using horizontal wells. Method means placing hydraulically connected to the well head through the upper obstacle-reflector column two tubing - TS string of different length in the casing string. One column of TS ends at the inlet to the horizontal section of the well. Other TS ended near the bottom of the casing string. This bottom is outlet obstacle-reflector, forming together with upper obstacle volume, inside of which is the liquid column working agent. Creating homogeneous wave field on the horizontal section of casing string in the liquid by installing vibration generators on the ends of the TS in the casing string. Vibration amplitude is increased. Vibration is controlled with recording of vibrations supplied via the cable from the downhole level meter to ground recording unit. Matching of oscillation phase on horizontal section of the well casing string is provided after well start-up in operating conditions of hydrocarbons production by change of the initially selected oscillation frequency output pressure generators by automatic or manual variation of flow rates of working agent through generators provided that flow rate in steady-state conditions. Initial length of TS, prior to lowering into well is selected through calculation using the analytic expressions in case phases of oscillations match and amplitudes of oscillations equality on horizontal section of casing string for a selected frequency action on formation.

EFFECT: technical result - increased output of productive formation as a whole and on horizontal sections of the well due to wave action optimization.

1 cl, 2 dwg

 



 

Same patents:

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

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil producing industry and intended for improvement of oil recovery of productive formations. The method of excitement of wave field on the injection well face consists in that the flat constrained flow of liquid is supplied continuously from the slot-hole nozzle to the wedge nose. Meanwhile the area of primary generation of vortex structures in the zone behind the nozzle cut edge is formed. Periodic breakdown of ring vortex structures from the nozzle cut edge, their movement with flow and impact with the wedge nose are provided. Pressure disturbances are generated at deformation and destruction of vortex structures on the wedge nose. Propagation of periodic pressure disturbances from the wedge nose extensively in the form of elastic waves and their chaotic reflection from surrounding walls is performed. The excitation by energy of multiple vortex structures due to energy of elastic oscillations achieving primary generation area is conducted. The liquid flow on the wedge nose is deflected to one of two diverging outlet channels. The flow is divided at the inlet upstream the output channel and sent partially to the lateral chamber interfaced with the nozzle edge and the output channel. In the chamber the pressure is increased due to piston effect of the supplied flow and the flow is pushed away to the opposite output channel, formed from two of its sides by the pressure difference. Periodic switching of the liquid flow direction between output channels is provided. The liquid is displaced alternately from the diverging channels into the common punched output collector. The field of elastic oscillations is excite on the injection well face. Thus the elastic waves reflected from walls of each chamber are focused on the nozzle cut edge interfaced to it.

EFFECT: improvement of efficiency of conversion of kinetic energy of the flow to oscillatory energy of the wave field.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention mainly relates to methods of hydrocarbons production from hydrocarbons containing reservoirs. Method of treatment of the reservoir containing crude oil including stages when: (a) composition is supplied to extract the hydrocarbons to at least part of the reservoir, at that the composition contains at least two internal olefin sulphonates selected from group comprising internal C15-18-olefin sulphonates, internal C19-23-olefin sulphonates, internal C20-24-olefin sulphonates and internal C24-28-olefin sulphonates, and at least one viscosity decreasing compound, that is isobutyl alcohol, ethoxylated C2-C12-alhohol, 2-butoxyethyl, butyl ether of diethylene glycol or their mixture, and (b) composition is provided with possibility to react with the reservoir hydrocarbons. Invention also relates to method of viscosity decreasing of composition of highly active surface-active substance and composition for hydrocarbons extraction.

EFFECT: result is creation of more effective method of hydrocarbons extraction from crude oil containing reservoir.

14 cl, 2 dwg, 2 tbl, 2 ex

FIELD: oil and gas industry.

SUBSTANCE: method involves hydrophobisation of pore space in bottom-hole zone rock with 0.5-25% solution of polymethylhydridosiloxane in organic liquid containing its polymerisation catalyst. The solution is pushed down into the reservoir by gaseous agent selected out of nitrogen, natural gas, exhaust gases of combustion engines. Gaseous agent is fed to the well at a pressure exceeding reservoir pressure at least by 1.0 MPa. After the solution is pushed down, the well is left for process aging for two days.

EFFECT: reduced water saturation of reservoir bottom-hole zone, enhanced gas well deliverability with single treatment of reservoir.

3 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes vibration impact on the oil reservoir by the resilient oscillation sources. For this on ground surface near the wellhead of the production well the oscillation sources of same frequency are installed. Near the external boundary of the specified well the oscillation sources of same but higher frequency are also installed. Simultaneous impact of oscillations from all sources on the oil reservoir is performed with intensity, time of impact and oscillations interference ensuring coagulation of oil drops in porous space of the oil reservoir with water and directed flow movement due to difference of frequencies of the oscillation sources towards wellhead of the production well. At that contracting effect of the directed flow movement towards the wellhead of the production well is specified by number of sources of the resilient oscillations in the external boundary of the production well.

EFFECT: increased oil extraction due to reduced filtration resistances during water-oil emulsion movement via the porous environment.

2 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to secondary methods of HC extraction from the underground reservoirs, in particular to methods of the hydraulic fracturing without the proppant, as well as to the selective injection to some underground reservoirs. As per the method the selective stratum of stratums set is isolated along the well bore in the underground section from rest stratums of the set. The selective injection is used to supply fluid to the selective stratum in the stratums set. At that the fluid is supplied to the selective stratum regardless of the fact weather the fluid was supplied to the neighbouring stratum of the stratums set. Isolation means isolation of the stratums set from pressure acting on the selective stratum when the fluid is supplied to the selective stratum. Hydraulic fracturing of each stratum of the stratums set is performed. Testing of the stepwise pressure variation is performed for at least one stratum of the stratums set. Testing of the stepwise pressure variation includes opening of one of the reservoir stratums in the stratums set by the fluid injection to the well bore. At that one of the stratums is opened at specified pressure. The fluid backflow is ensured such that one of the reservoir stratums is closed. Re-opening of the one of the reservoir stratums is performed for one or more times. At that the reservoir opening pressure is reduced each time. Mode is determined when the reservoir opening pressure is below the injection pressure at which the reservoir injection ensures the fluid supply to the stratums set. As response to determination that the reservoir re-opening pressure is below the injection pressure the test is completed by stepwise pressure variation.

EFFECT: increased efficiency of HC production.

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: group of inventions relates to oil producing industry and intended for improvement of oil recovery of productive formations. The method of excitement of wave field on the injection well face consists in that the flat constrained flow of liquid is supplied continuously from the slot-hole nozzle to the wedge nose. Meanwhile the area of primary generation of vortex structures in the zone behind the nozzle cut edge is formed. Periodic breakdown of ring vortex structures from the nozzle cut edge, their movement with flow and impact with the wedge nose are provided. Pressure disturbances are generated at deformation and destruction of vortex structures on the wedge nose. Propagation of periodic pressure disturbances from the wedge nose extensively in the form of elastic waves and their chaotic reflection from surrounding walls is performed. The excitation by energy of multiple vortex structures due to energy of elastic oscillations achieving primary generation area is conducted. The liquid flow on the wedge nose is deflected to one of two diverging outlet channels. The flow is divided at the inlet upstream the output channel and sent partially to the lateral chamber interfaced with the nozzle edge and the output channel. In the chamber the pressure is increased due to piston effect of the supplied flow and the flow is pushed away to the opposite output channel, formed from two of its sides by the pressure difference. Periodic switching of the liquid flow direction between output channels is provided. The liquid is displaced alternately from the diverging channels into the common punched output collector. The field of elastic oscillations is excite on the injection well face. Thus the elastic waves reflected from walls of each chamber are focused on the nozzle cut edge interfaced to it.

EFFECT: improvement of efficiency of conversion of kinetic energy of the flow to oscillatory energy of the wave field.

2 cl, 1 dwg

FIELD: mining.

SUBSTANCE: according to the method acoustic, electric, mechanical and hydrodynamic compressing and pulling stresses are formed by acting by periodic short impulses by means of explosion of a calibrated conductor placed in a working interval of a well. This energy of explosion is brought to the coal seam. In the well the slot-hole perforation is created which is oriented in the directions of main stresses in the coal seam. An additional slot-hole perforation is formed in permeable rocks containing the coal seam. The direction of additional slot-hole perforation is oriented in the directions of the main stresses of the rocks containing the coal seam. It strengthens acoustic and hydrodynamic cavitation of gas bubbles emitted from coal, fractures, microfractures, pores, micropores, capillaries, microcapillaries of the coal seam. Fractures and microfractures are also formed in the permeable rocks containing the coal seam. It favors to development of mesh of abnormal microfracturing in the coal seam and additional fractures and microfractures in the permeable rocks containing the coal seam. In general all factors provide the maximum desorption and diffusion of methane.

EFFECT: increase of production of coal methane, reduction of energy consumption, improvement of safety and environmental friendliness of the process.

5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: this device comprises hollow case with cover that has working fluid feed channels and bottom with discharge channel that features cross-section larger than that of working fluid feed channel for communication case inside with well bottom zone, moving working member that makes with said case the working chambers. Said working member is shaped to truncated ellipse fitted on the case at antifriction bearing and composed of axle with relationship between arms of top and bottom ends equal to 1:2. Aforesaid working member has the channel to communicate working chamber, antifriction bearing with the case bottom discharge channel. Nozzle is arranged under said bottom with communicating discharge channel and radial equal-cross-section area. Total cross-section area of said holes equals that of discharge channel. Cover bottom surface and bottom upper surface are composed of cylinder generatrix to allow displacement of working member top and bottom arms there over and isolation of working chambers.

EFFECT: higher efficiency of stationary pulse injection of fluid.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: regulated hydrodynamic wave generator in the producer includes a sucker-rod pump unit and a two-piece piston with centrators placed in the production casing under dynamic level of the oil well fluid at the shank end or at the lower part of the production tubing made as the tubing string. The two-piece piston is made as a bank of elements chocking jets of the oil well fluid in the production casing. The bank is formed of choking elements so that they may be flown around their bodies and their flow passages are narrowed for the oil well fluid. The choking elements are made with sharpened outer edges and flow-around surfaces at least from the side faced towards dynamic level of the oil well fluid with potential narrowing in width of flow passages and speeding-up of the oil well fluid jets in the area of jets breaking from the outer edges of the choking elements.

EFFECT: improved oil recovery due to intensification of filtering processes in the productive stratum and involvement into operation of non-operated or low-operated interlayers in the development element.

5 cl, 4 dwg, 2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to the oil producing industry and intended for the improvement of oil recovery of productive formations. The method for generating a wave field at an injector bottomhole with the automatic tuning of a generation constant frequency lies in the generation of pressure fluctuations in a fluid flow pumped to a productive formation through tubing strings by its pumping through the flow-excited Helmholtz resonator (FEHR). At that the flow rate at a cross-section of an input nozzle and the distance between the input nozzle and a bushing with a discharge outlet is maintained. Moreover the flow rate at the cross-section of the input nozzle and the distance between the input nozzle and bushing with the discharge outlet is maintained due to the movement of the bushing with the discharge outlet, thus ensuring an increase of this distance at an increased flow rate and the above decreased distance at a reduced flow rate. The device used to this end consists of FEHR installed inside the tubing string; it represents a hollow cylindrical chamber with flat bottoms, wherein the input nozzle is placed in the front bottom and the bushing with the discharge outlet is placed in the rare bottom. At that the bushing with the discharge outlet is made movable and inside the tubing string behind FEHR there is a fixed hydraulic cylinder with a spring-supported piston connected by a rod to the fixed bushing with the discharge outlet. At that the cavity inside the hydraulic cylinder in front of the piston is communicated downstream to the annular space while the cavity behind the piston is connected to the inner volume of the tubing string.

EFFECT: improved efficiency of the stable frequency generation of pressure fluctuations at the bottomhole.

4 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to the oil producing industry and intended for the improvement of oil recovery of productive formations. The method for generating a wave field at an injector bottomhole with the automatic tuning of a generation resonant mode lies in the generation of pressure fluctuations in a fluid flow pumped to a productive formation through tubing strings by its pumping through the flow-excited Helmholtz resonator (FEHR). At that the respective flow rate and the FEHR volume is maintained at the cross-section of a feed nozzle. Moreover the respective flow rate at the cross-section of the feed nozzle and the FEHR volume is maintained due to the movement of its downstream rare bottom, thus increasing the FEHR volume at a reduced flow rate and reduced FEHR volume at an increased flow rate. The device used to this end consists of FEHR installed inside the tubing string; it represents a hollow cylindrical chamber with flat bottoms. In the front chamber of the bottom the feed nozzle is mounted and a discharge outlet with sharp edges is made at the rare bottom. At that the rare bottom is made movable and inside the tubing string behind FEHR there is a fixed hydraulic cylinder with a spring-supported piston connected by a rod to the movable rare bottom. At that the cavity inside the hydraulic cylinder in front of the piston is connected downstream to the inner volume of the tubing string while the cavity behind the piston is communicated to the annular space.

EFFECT: improved efficiency to maintain the stable high intensity of the wave field at the bottomhole.

4 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: rotary hydraulic vibrator includes a hollow body with spool installed coaxially to it. The body comprises an axial cylindrical channel with process openings in it matched by channels to the spool openings. The body is blinded from below. The spool is installed at the support coaxially to the body. In the axial cylindrical channel process openings are made by four openings in two rows, at that they are radial and mutually perpendicular in pairs. Spool openings matched to them and placed in the upper row are made radial, while the openings placed in the lower row and matched by a grove are offset tangentially. Jet nozzles are installed in the spool openings. Spool openings are made so that replaceable jet nozzles of different diameter and configuration may be set in them.

EFFECT: improved quality of cleanup for the reservoir perforated interval and increased permeability of rock within the well perforated interval due to provided effective parameters of impact and pulsed action at simplified design of the used equipment and reduced power requirement for the ground pumping equipment.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil producing industry and intended for improvement of oil recovery of the productive formations. The invention represents the method for wave field generation at the injector bottomhole with permanent rate of generation and adjustment of Helmholtz flow resonator for maintenance of fixed rate of pressure fluctuations in the liquid flow injected to the formation at changed formation pressure. The method lies in automatic adjustment of the flow section area for output opening in compliance with changes of formation pressure. It is required to maintain the permanent rate of the flow at the nozzle cut defining generation frequency to ensure a stable high amplification factor. The novelty lies in the unit in the output opening of Helmholtz flow resonator of the movable conical slide valve with hydraulic drive ensuring automatic movement of the valve at change in pressure drop at the device.

EFFECT: improved efficiency of permanent tone frequency maintenance at the opening.

3 cl, 1 dwg

Downhole pulsator // 2539087

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to devices used for formation simulation. Device for hydropercussion simulation of the formation included into the assembly of flow string comprises a hydraulic cylinder with crossover shoe, a plunger with radial openings, a spring-actuated pusher with circular bore and a ring piston. At that the hydraulic cylinder is fixed rigidly to a chamber with a landing ring installed in it and longitudinal grooves at its outer side. The pusher is equipped with outside protrusion, a saddle and a ball valve in the axial channel. The pusher lower end is passed to the axial channel of the landing ring and equipped with a locking ring interconnected with the pusher by a shear pin. The chamber axial channel is covered from below by a thrust ring and equipped with a hollow rod with the end valve pressed by a spring to the landing ring. At that in the end valve body there is a bore with a loose locking ring installed in it and the plunger is equipped with a ring piston thus forming an annular gap with the hydraulic cylinder coupled hydraulically to annular space by bypass ports.

EFFECT: improved efficiency of hydropercussion simulation of the formation.

4 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas production, particularly, to the recovery of the well permeability and can be used for the well repair. The proposed method comprises using the laser radiation to act on the well fluid at a power to develop plasma breakdowns in the fluid. Note here that, first, the laser pulse or intermittent radiation is used to generate the said breakdown and, thereafter, the frequency of an acoustic signal originating at the said breakdown is measured. Then, further effects in the pulse mode are used at the said frequency of the laser radiation.

EFFECT: profound effects on the well walls, higher permeability of the well (oil yield).

3 cl, 1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: vibrator has body with inlet and outlet channels and rotor with blades, supported by bearing. A valve is mounted in body, made with slits and bottom with apertures in middle portion. Valve is mounted in body on thread with possible axial displacement. Rotor with blades and apertures in bottom is mounted on bearing in axial channel of valve. Slits of valve are made lower than rotor mounting position, to feed liquid into well, bypassing the valve, and above rotor position, with possible feeding of liquid into valve onto rotor blades after its axial displacement. Axial channel of valve is covered by lid with rod, with possible insertion thereof into rotor axial channel. Valve drive in the body is limited by transfer pipe at lower portion.

EFFECT: higher quality.

3 dwg

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