Development method of underwater gas-hydrate deposits
FIELD: oil and gas industry.
SUBSTANCE: method involves destruction of massif of a hydrate-containing manifold with high-pressure water jets, formation from destructed material of pulp in a near-bottom volume covered with a dome, lifting of the pulp containing gas and gas-hydrate onto a floating structure via a pipeline and separation of the pulp into gas, water and solid material with gas transfer to a state suitable for transportation. According to the invention, massif of the hydrate-containing manifold is converted to a solid body-liquid fine suspension with gas-hydrate particle size of 10-20 mcm. For that purpose, it is influenced with high-pressure jets formed in the near-bottom volume covered with the dome. Besides, the volume of the pulp formed in this volume is treated with an ultrasound with parameters causing cavitation effects in it. A hydrate-containing suspension is formed with content in it of a disperse phase of gas-hydrate of up to 20-25%. Capacity of destruction devices of massif of the hydrate-containing manifold is controlled proportionally to pressure in the pipeline in its near-bottom section. An ice pulp formed at dissociation of the gas hydrate is used for cooling of compressed gas - a product of dissociation of a gas-hydrate pulp.
EFFECT: increasing well performance efficiency of a gas-hydrate deposit.
6 cl, 5 dwg
The invention relates to oil and gas industry and, in particular, to the development of deposits (deposits) of gas hydrates.
There is a method of field development, gas hydrates, including the drilling of deposits across the layers, the formation of the heat flow in the underlying underlying the formation and selection of hydrocarbons from the overlying gas hydrate formation, and the formation of the heat flow carried out by initiating in-situ burning and maintenance of the combustion front in the underlying layer by feeding the oxidant through the annulus between the tubing - the tubing and the production column with perforated holes on the initial part of the horizontal section, the length of which is chosen from the condition of providing warm-up formed by the decomposition of gas hydrates gas mixture to a temperature prevent the formation of gas hydrates in the course of its movement in the interval from the roof of the underlying reservoir to the wellhead, and the selection of the hydrocarbon is natural gas with water to produce through multilateral perforated horizontal branch (see EN NO. 2306410, EV 43/24, 2007).
The disadvantage of this method is that its implementation must also be located below the reservoir, the gas guide is the ATA, of which is the production of gas, the underlying layers of hydrocarbons (oil or gas) capable of in-situ combustion with heat transfer in the overlying gas hydrate formation. Deposit with such arrangement of the layers is quite unique and therefore, the application of this method is limited. Artificial formation downstream of the hydrocarbon reservoir increases the cost of well construction, complicates the technology of gas production and leads to lower profitability of gas production from hydrates. In addition, for the implementation of the method it is necessary to pump large quantities of air into the reservoir, spending a large amount of electrical energy.
There is also known a method of extracting gas from gas hydrates (see EN NO. 2169834, EV 43/16, EV 43/24), including supply of heat to the zone of decomposition of gas hydrates by holding in the zone of decomposition of gas hydrates exothermic catalytic reaction with a specific heat greater than the heat of dissociation of solid gas hydrate. The catalytic reaction using oxidation, including electrochemical, methane in the synthesis gas or partial oxidation of methane to CO2and water, or oxidative dimerization of methane, or the oxidation of methane to methanol. Moreover, the liberated gas is subjected to additional chemical processing directly edstone in the area of production. Moreover, the heat generated directly in the zone of decomposition of gas hydrates during the catalytic reaction, is spent on maintaining the reactor in autothermal mode, and the decomposition of the surrounding gas hydrates.
This method has the following disadvantages.
High probability of explosions in the zone of decomposition of gas hydrates at carrying out exothermic catalytic reactions of methane oxidation due to the fact that a mixture of methane with air (oxygen) is extremely explosive (limits explosive limit: lower 5 vol.%, top 15 vol.%). The in-situ explosions can lead to the formation of cracks in the layers, isolating the zone of gas hydrates, and, as a consequence, uncontrolled depressurization of the latter and to an environmental disaster in the area of gas production. To reduce the danger of explosion, it is necessary to use in the well in the extreme conditions of complex high-precision equipment, dosing quantity of the interacting substances, which leads to an appreciation of the technological equipment and to lower profitability of gas production.
Use as catalysts compounds of rare earth elements of La2EN2(or Ir2)O7, perovskite type LaRhO3containing rare-earth metal oxide type system NiO-CaO, NiO-MgO, CoO-MgO, NiO-rare earth oxide,Ni/Al 2O3, Ni-containing complex oxide systems of perovskite-type LaNi1-xRhxOyincreases capital and operating costs (the latter is required when the periodic replacement of the catalyst) technology gas production and reduces the profitability of production.
The high energy cost of the oxidant injection of methane, in particular of air from atmospheric pressure to the pressure in the zone of gas hydrates (963 kW 1 kg/s of air).
Also known the way of development of marine gas hydrate deposits, including the destruction of hydrate serving bottom water temperatures of 1-2°C exceeds the equilibrium conditions for development, the rise of the pulp containing gas and gas hydrate on a floating basis through the pipeline and separation of the pulp for gas, water and solid material (see General. inform. Ser. Information support of the all-Union scientific-technical programs, vol.3. M: Negatron, 1986).
The disadvantage of this method is the high energy consumption. The cost of energy necessary for heating the slurry to a temperature of decomposition of gas hydrates and its transportation. The more the performance of the system, the greater will be the energy costs ceteris paribus. Indeed, were conducted in the initial conditions, the heat capacity of substances 1 m3pulp extending t is approximately 49-10 3kJ/°C. Thus, for heating the whole of the pulp at the bottom to a temperature exceeding the equilibrium at 1-2°C, the water temperature at the surface of the ocean (at different latitudes it is 0-4°C), it takes an enormous amount of heat or a significant expenditure of energy on the flow of heated water from the respective horizons. High energy costs and the rise of pulp on the surface of the hydraulic dredge with a airlift system. For these conditions, they are of the order of 86,4103kJ 1 m3the precipitate.
Also known the way of the development of submarine gas hydrate deposits, including the destruction of the hydrate of high-pressure jets of water, the formation of the demolished material slurry in the bottom of the volume covered by the dome, the rise of the pulp containing gas and gas hydrate on a floating basis through the pipeline and separation of the pulp for gas, water and solid material, with the transfer gas in a condition suitable for transportation (see RU # 113786, AS 50/02, EV 43/01, 2011).
The disadvantage of this method is the high energy consumption of the implementation (you want to provide a vacuum pump for gas sampling from pulp and decomposition of gas hydrates by heating of the slurry). In addition, the lack of efficiency of destruction array sediment collector hydrate as at great depth (km) effective the efficiency of the operation of the compressor will be reduced due to the high pressure environment in the area of mining.
The objective of the invention is to improve the efficiency of mining of gas hydrate deposits.
Technical result achieved when the task is expressed in the possibility of using for the destruction of the hydrate additional physical effects. In addition, ensure the effective rise of the pulp with the exception of the possibility of the formation of gas hydrate plugs in the lifting section of the pipeline eliminates the energy consumption for the dissociation of gas hydrate. Minimized loss section of the pipe work is not associated with the rise of the pulp.
The problem is solved in that way the development of submarine gas hydrate deposits, including the destruction of the array gertsogenauh manifold high-pressure jets of water, the formation of the demolished material slurry in the bottom of the volume covered by the dome, the rise of the pulp containing gas and gas hydrate on a floating basis through the pipeline and separation of the pulp for gas, water and solid material, with the transfer gas in a condition suitable for transportation, characterized in that carry out the conversion array gertsogenauh collector in fine suspension "solid - liquid", which affect him high pressure jets formed in the bottom volume, covered dome, additionally, the volume of the pulp, formed in this volume, process the acoustic field, causing her cavitation effects, in addition, hydrocodonebuy suspension form with a content of disperse phase hydrate up to 20-25%, in addition, the performance of the destruction of the array gertsogenauh collector regulate proportional to the pressure in the pipe at its bottom section, in addition, ice slurry, formed by dissociation of gas hydrate, is used for cooling komprimierung gas product from the dissociation of gas hydrate slurry. In addition, the water remaining after separation from the pulp of gas and solid particles are returned to the cavity of the dome. In addition, the high-pressure jet is formed by means of submersible pumping equipment that is placed in the volume covered by a dome. In addition, the high-pressure jet is formed by the generation of electro-hydraulic shock. In addition, carry out electro-destruction array gertsogenauh collector. In addition, carry out hydrodynamic conversion of gas hydrate components of the pulp in a smaller fraction in the volume of the dome form a circulation material, preferably in an upward spiral.
Comparative analysis of the characteristics of the claimed solution with the characteristics of the prototype and the Academy of Sciences of the logs indicates compliance solutions to the criterion of "novelty".
Signs of a distinctive part of the formula of the invention provide a solution to complex functional tasks.
Signs "...carry out the conversion array gertsogenauh collector in fine suspension "solid - liquid", which affect him high pressure jets formed in the bottom of the volume covered by the dome provide for effective lifting slurry pipeline and complete dissociation of gas hydrate gas and water (with the exception of the possibility of overlap of the pipeline ice or hydrate plugs), in addition, they eliminate the need to supply high-pressure working fluid from the craft in the bottom space, which reduces the requirements to the strength parameters of the pipeline, providing a supply of working fluid to the rock cutting tools.
Signs indicating that "the volume of slurry generated in the volume of the dome "handle acoustic field, causing her cavitation effects help to improve the dispersibility of the particles of the pulp. When it bubbles, resulting from exposure to acoustic cavitation field on the boundary "bottom collector - sea water", slam during the half cycles of compression, creating short-term (duration ~10-6(C) pulse pressure (up to 108is a and more) able to destroy even very hard materials. Criterion erosive activity ultrasonic field increases with increasing hydrostatic pressure. So, for example, at a pressure of 4 ATM, the value of the criterion erosive activity of the ultrasonic field by several orders of magnitude higher than at a pressure of 1 ATM, which allows efficient use of this technological factor at pressure of about 100 ATM, which corresponds to the depth of the gas hydrate reservoir. Cavitation effects through the acoustic field allows not only to increase the efficiency of hydrodynamic impact, but also to achieve proper dispersion of the suspension order (10-20 μm). This effect does not require the supply of the working fluid in the bottom zone.
Signs indicating that "hydrocodonebuy suspension form with a content of disperse phase hydrate up to 20-25%, ensuring a trouble-free lifting of the pulp and complete dissociation of gas hydrate by using the heat capacity of water.
Signs indicating that "the performance of the destruction of the array gertsogenauh collector regulate proportional to the pressure in the pipe at its bottom section, enable you to regulate the process of forming a slurry with a concentration of particles of gas hydrate within the stated proportion, th is allows you to avoid the overlapping section of the pipe plugs of ice or hydrate and eliminate the need for a supply of external energy for dissociation.
Signs indicating that ice slurry formed by the dissociation of gas hydrate is used for cooling komprimierung gas product from the dissociation of gas hydrate slurry", can reduce the cost of energy to drive the compressor.
Signs indicating that "the water remaining after separation from the pulp of gas and solid particles are returned to the cavity of the dome", reduce emissions of methane to the atmosphere is possible, if discharged into the sea water containing residual gas saturation.
Signs indicating that "high-pressure jet is formed by means of submersible pumping equipment that is placed in the volume covered by the dome, provide the possibility of the formation of jets of working fluid directly into the bottom space of one of the possible methods. Signs indicating that "high-pressure jet is formed by the generation of electro-hydraulic shock", provide the possibility of the formation of jets of working fluid directly into the bottom of the second space of the possible methods.
Signs indicating that "additionally carry out hydrodynamic conversion of gas hydrate components of the pulp in a smaller fraction in the volume of the dome form a circulation material, preferably spiral, let t is nice grind the particles of gas hydrate in the composition of the pulp.
Signs indicating that "carry out electro-destruction array gertsogenauh collector, ensure the expansion of the range of damaging effects on the collector hydrate and range of intensities of these effects.
In Fig.1 schematically shows a floating installation, ensure the implementation of the claimed method (electro-hydraulic forming jets of high pressure), and Fig.2 shows the same in the formation of jets of high pressure submersible pumps; Fig.3 gives a diagram of state of the gas hydrate; Fig.4 presents a graph of the temperature - composition of sea water; Fig.5 shows a diagram of the adiabatic and polytropic work of compression of methane from 10 to 20 bar.
In the drawings is shown a floating base 1, the pipe 2, provided with a telescopic pull-out section 3 (i.e., by means of its length changes made with the possibility of automatic operation) placed, for example, in the upper zone of the pipeline 2, under body floating base 1, while outside the cavity of the pipeline 2 posted by cable 4, providing supply of electricity to grutsamaria mechanism 5, the generator of acoustic waves 6 and other consumers of electricity.
The floating base is made in a known manner in the form of a hull-borne corps or semi-submersible, platfo who we are. The means of selection of the gas from the pulp made in the form of the vessel 7, the gas outlet 8 through which the compressor 9 is communicated with the tank 10.
In the first embodiment, the formation of jets of high pressure water gruntboy mechanism 5 is made in the form of a system of parallel, pointed bottom of the pipe 11, the walls of which are made of holes 12 for output streams of high pressure water (preferably equipped with deployme nozzles, increase the "work" being fed through them jets of water), in the cavities of the sockets 11 posted by main electrodes 24 connected via a cable 4 to powerful pulsed current source 13, mounted on a floating basis 1.
Groundsamine device placed in the volume limited by the cavity of the dome 14, a wide end which is facing down and the top is in communication with the pipeline 2. The area of its wide end is exceed the space allocated to the nozzles 11 of the suction head; it (can reach several tens of meters), in addition, the dome 14 telescopically connected with the end of the pipeline 2.
When performing protozanova mechanism 5 according to the second variant it contains a system of parallel, pointed bottom of the pipe 11, the walls of which are made of holes 12 for output streams of high pressure water (preferably equipped with deployme nozzles, Kalevalsky "work" being fed through them water jets). The nozzle 11 is connected to the submersible pump 15 as the source of working fluid, mounted in the cavity of the dome 14.
Submersible electric pump 15 is also designed to supply the working fluid (water) in the pipe 11. In addition, in the cavity of the dome, it is advisable to place at least three jet nozzles 16, which receive water from the submersible pump 15, oriented tangentially in the same horizontal plane or with a slight angle upwards. In addition, the amount of gas hydrates 17.
To prevent overloading of the pipeline excessive amount raised on the surface of the material (to prevent the possibility of his testimonianza ice or hydrate plugs) in the pipeline (10-20 m above its junction with the dome) set the first pressure sensor 18, and above it, on 10-20 meters a second pressure sensor 19, which generates a control signal to change the pace of work protozanova mechanism. If excess amounts in the pipeline is removed from the surface of the collector hydrocodoneee breed specific pressure drop associated with an increased hydraulic resistance exceeds the preset value, the pace of work protozanova mechanism is lowered, i.e. the performance of the destruction of the array gertsogenauh collector regulate about antionline pressure in the pipe at its bottom section. In addition, in the drawings shows the pipeline 20 for discharge into the cavity of the dome 14. The dome can have its own propulsion, including at least three jet nozzles 21, mounted on the outside of the dome, receiving water from the submersible pump 15, which are oriented radially relative to the dome.
The claimed method is implemented as follows.
The initial position of installation: floating base 1 is positioned relative to the mine site (this uses a well-known system of at least three anchor is not shown, or dynamic positioning system, performed in a known manner and includes multiple jets placed along the perimeter of the floating bases), and the pipeline 2 is lowered to the bottom of the water area so that gruntboy mechanism 5 is in direct contact with the surface of the volume of gas hydrates 17, with the dome 14 is also lowered its bottom edge on the surface of the volume of gas hydrates 17, isolating the working area of the nozzle 11 from the remaining volume of water. In this position, the pipe 2 is filled with seawater.
Water submersible electric pump 15 in the pipe 11 leads to the release of high-pressure jets of water from the cavity of the socket (through holes 12). The interaction of these jets with solid hydrate causes the destruction of the latter, including the Isla breakaway pieces of gas hydrate and other solid material.
Additionally, an array of gas hydrate reservoir and the bottom volume of the slurry contained in the bottom of the volume covered by the dome) process the acoustic field, causing them cavitation effects. Bubbles arising from the influence of acoustic field on the partition borders "pieces and particles of gas hydrate - seawater and bottom of the collector - sea water", slam during the half cycles of compression, creating short-term (duration ~10-6(C) pulse pressure (up to 108PA and more) that can destroy even very hard materials. Erosion activity ultrasonic field increases with increasing hydrostatic pressure, which allows efficient use of this technological factor at pressure of about 100 ATM, which corresponds to the depth of the gas hydrate reservoir. Cavitation effects through the acoustic field allows not only to increase the efficiency of hydrodynamic impact, but also to achieve proper dispersion of the slurry (suspension). The dispersion of the suspension by the value of the order of 10-20 microns allows you to use special thermal properties of hydrate particles as a thin thermal objects.
Additionally, creating in the volume limited by the dome 14 spiral upward movement of the material (due to the inclusion in the work badomen the x nozzles 16), provide additional vzaimoperesechenie particles hydrate before their entrance into the pipeline 2.
As you move fine hydrocodoneee slurry pipeline from the bottom (point 1, Fig.3) to the sea surface (point 5, Fig.3), the pressure will decrease and the point of intersection of the isotherm of +2°C (temperature hydrocodoneee suspension with a line of equilibrium "Hydrate-Water + Gas (point 2, Fig.3) hydrate particles will enter the area to the unstable state. After about 20 meters after gas hydrate slurry crosses the line of equilibrium (point 3, Fig.3), the hydrate particles will begin to dissociate into free gas and water.
To start the mechanism of the decomposition of gas hydrate you must fulfill the following conditions:
- to leave the area thermodynamically stable state;
- to bring the heat equal to the heat of dissociation of gas hydrate (430 kJ/kg).
Because the slurry contains 65-85% of sea water, from 0 to 10% of the soil particles and 15-25% of particles hydrate, dissotsiiruut particles hydrate, being surrounded by sea water, will begin to pick up its internal energy and thus reduce the temperature. After the sea water will reduce its temperature from +2 to-1.8°C, it begins to crystallize and give warmth to their crystallization dissotsiiruut particles hydrate. The temperature of gather the same as the receiver heat crystallizing sea water will be -2°C, since the temperature gradient magnitude 0.2°C will ensure the appearance of the heat flux necessary power in terms of the interfacial heat transfer. When this gas hydrate slurry will begin to transform into gasolineras because dissociologist the hydrate would be replaced by particles of water ice. Thus, the pipeline on Board the vessel, starting from a depth of 350 meters, you will move a suspension of particles of species, growing particles of water ice, dissociate of hydrate particles, bubbles of free gas and liquid sea water as the dispersion medium (water of crystallization will allocate 335 kJ/kg of heat energy that will be used particles of hydrate to its dissociation).
Thus, from a depth of 350 meters will begin to operate gas lift, drive which will be the energy stored in the hydrates in the process of their formation on the bottom of the sea.
The temperature of the resulting suspension will be -2°C, but this will not lead to the freezing of water ice particles, because they will be surrounded by an aqueous solution with an appropriate concentration of mineral substances (Fig.4).
The low thermal conductivity of hydrate particles will not be a limiting factor to the kinetics of their dissociation, because if the hydrate particles have dimensions of thermally thin bodies, the magnitude of their thermal conductivity does not affect the heat flux, the which passes through them.
Gas on Board the vessel is subjected to normal commercial processing, for example, pressurized up to 300 kg/cm2in the cylinders of composite fiberglass FRP, the use of which is approved by classification societies, overseeing the design and construction of vessels (see http://www.transoceangas.com/Development_Plan.htm).
In the process of compressing natural gas losteria suspension will be used for cooling, which will reduce the cost of energy to drive the compressor (not shown) through an external source of cold particles of ice that make up the pulp.
In Fig.5 the process 1-2 is normal isotropic compression discharge temperature at compressor +35°C, while the compression 2-3 carried out by polytrope with the discharge temperature at the compressor +20°C by cooling the gas to be compressed by an external cold source. This polytropic process requires 1-3 unit cost of the work to compress the gas 40 kJ/kg, whereas the adiabatic 1-2 cost work in the amount of 100 kJ/kg From the point of view of the law of conservation of energy, cold, as well as the expansion energy of methane in the pipeline, obtained through intermolecular van der Waals forces dissociation of hydrate when it is off the equilibrium path.
Water after the separation from it of rock particles and natural gas prepact the tion should return to the cycle (if there is no possibility of its standard purification from hydrogen sulfide, of carbon dioxide and other non-hydrocarbonaceous gases), since the residual gas saturation when necrose into the sea untreated gases from water can lead to methane emissions into the atmosphere. Solid suspension accumulates in the hopper 22 and either reset by a flexible sleeve on the bottom of the sea (not shown), or a known manner not exported to shore for disposal, if it contains valuable components.
It is known that the seafloor sedimentary formations of sand and silt have or may have fragments of rock, the strength of which does not allow you to destroy them by means of high pressure jets. Thus, on the external surfaces of the pipes 11 posted by additional electrodes 23 connected via a cable 4 to powerful pulsed current source 13, mounted on a floating basis of 1 (they provide the disintegration of rock fragments with high-voltage electrical pulses). On the stage of discharge in the rock channel discharge passes through the areas the location of the local electrical inhomogeneities, i.e., rock inclusions in sandy or muddy ground. Thus, the discharge channel passes through the boundary, generating energy pulses over a short period of time (~10-6C), while in the discharge channel almost instantly increases the pressure up to 109PA. As a result, the channel rasra is and generates a shock wave compression and expanding forms inside the rock mechanical stress, which disintegrate into separate small fragments.
Transportation of natural gas will be in compressed form on specialized courts operating at the transport shoulder to 1000 nautical miles more appropriate from a commercial point of view compared to the use of tankers for transportation of liquefied natural gas.
Thus, the proposed solution can significantly reduce energy costs for the destruction of the gas hydrate reservoir and transportation hydrocodoneee pulp, to provide installation and flexible control modes at high performance gas-lift system.
1. The way of the development of submarine gas hydrate deposits, including the destruction of the array gertsogenauh manifold high-pressure jets of water, the formation of the demolished material slurry in the bottom of the volume covered by the dome, the rise of the pulp containing gas and gas hydrate on a floating basis through the pipeline and separation of the pulp for gas, water and solid material with the transfer gas in a condition suitable for transportation, characterized in that carry out the conversion array gertsogenauh collector in fine suspension "solid - liquids is ü" particle size of hydrate 10-20 μm, what influence, high pressure jets formed in the bottom of the volume covered by the dome, additionally, the volume of the slurry formed in this volume, treated with ultrasound parameters, causing it cavitational effects, in addition, hydrocodonebuy suspension form with a content of disperse phase hydrate up to 20-25%, in addition, the performance of the destruction of the array gertsogenauh collector regulate proportional to the pressure in the pipe at its bottom section, in addition, ice slurry, formed by dissociation of gas hydrate, is used for cooling komprimierung gas product from the dissociation of gas hydrate slurry.
2. The method according to p. 1, characterized in that the water remaining after separation from the pulp of gas and solid particles are returned to the cavity of the dome.
3. The method according to p. 1, characterized in that the high-pressure jet is formed by means of submersible pumping equipment that is placed in the volume covered by the dome.
4. The method according to p. 1, characterized in that the high-pressure jet is formed by the generation of electro-hydraulic shock.
5. The method according to p. 1, characterized in that exercise electro destruction array gertsogenauh collector.
6. The method according to p. 1, characterized in that the additional is but carry out hydrodynamic conversion of gas hydrate components of the pulp in a smaller fraction why in the volume of the dome form a circulation material preferably in an upward spiral.
FIELD: oil and gas industry.
SUBSTANCE: according to the method in a watered part of a formation at first remedial cementing is made to cut the inflow of stratal water off and to isolate the watered part of the formation by a cement plug setting. A geophysical survey is performed in the non-watered part of the formation. Intervals are identified with bigger permeability of the productive formation areas. An assembly with an end-to-end channel is run in at the drill string and set by means of an anchor packer device. It is oriented towards one of the permeable areas of the productive formation. Mill equipment with a downhole drilling motor, flexible shaft and cutter is run in to the well at a flexible tube. An opening is cut in the production string wall with the use of an oil-based solution. The mill equipment is run out from the well. A jet nozzle is run in to the well up to a discharge outlet of the guide assembly. Cement stone and rock is washed out behind the production string so that a radial borehole is formed. The radial borehole treatment is made through the jet nozzle by an acid composition so that a cavern is formed. The flexible pipe with the jet nozzle is lifted out of the well. The guide assembly is rotated, for example, per 180 degrees and similar operations are performed to tunnel the next radial borehole. The guide assembly is lifted to the height of the next interval in the permeable areas of the productive formation and the similar operations are performed to tunnel the next radial boreholes. Up to the upper radial boreholes of the well an oil string is run in and the above string is made of tubing strings with the area of a clearance hole equal to the sum of all the clearance holes in the radial boreholes. The well is brought to operation.
EFFECT: improved efficiency of the method due to the removal of conditions for swelling of clays contained in the productive formation at tunnelling the radial borehole in low-permeable terrigenous deposits of water-swelling clays.
3 ex, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: according to the method a removable whipstock is installed. Then a window is cut in boring case. An offshoot is drilled from the main borehole. Offshoot drilling is made with running in of the boring case, its continuous cementing, perforation and provision of required reliability of attachment in the area of offshoot tracking. At that behind-the-casing flows of gas and liquid mixture are excluded. To this end upon window cutting a cement ring is cut in the boring casing and adjoining soil is cut as well in direction of offshoot drilling forming a cavern with diameter exceeding diameter of the offshoot. The cavern is poured with solid sealing compound and offshoot is drilled through the cavern. Downhole pumping equipment is placed in the main borehole and oil is extracted from the main borehole and offshoot.
EFFECT: increased oil extraction from offshoot at operated main borehole.
3 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to the oil and gas industry and can be used in particular to prolong anhydrous operation conditions of oil producers. The substance of the invention: a device comprises a pipe string lowered into a well, a packer with a sealing member and a flow shutdown mounted therein; a hollow body comprises a pipe concentric with its axis. From above, this pipe is rigidly connected to the pipe string, and from below - to a piston. The pipe and piston are axially movable in relation to the hollow body from the flow shutdown. The hollow body from the flow shutdown is blind off from below; its holes are inclined at 120° to each other in three vertical planes along the perimeter of the hollow body. The first vertical plane comprises two holes above and below the sealing element of the packer, respectively. One hole is formed in the second vertical plane below the sealing element of the packer. The third vertical plane has one hole above the sealing element of the packer. The piston has a slot configured to provide an alternative connection of the holes of the vertical planes to the pipe inside when the pipe string and piston move axially and rotate about the hollow body of the flow shutdown. The hollow body of the flow shutdown is provided with an outer long slot inside from below, while the piston at the bottom has three inner long grooves inclined at 120° to each other along the perimeter; the outer long slot of the hollow body of the flow shutdown can be fixed in any of the three inner long grooves of the piston.
EFFECT: simplifying the operational structure of the device, improving its reliability and enhancing the same.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to chemical and thermal treatment of a bottom-hole formation zone in developing high-viscosity oil deposits. A hollow cylinder rod is connected to a line of hollow pumping rods. A unit has also a working substance supply unit. This unit is stationary and isolated from a well production gathering line. An inside below an intake screen of the pump, between the cylinder wall and the surface of the hollow rod is divided into two sections. The cylinder rod is common for both sections and extends through a cylinder rod packing. The packing is provided between the sections. The bottom of the cylinder is connected to a tail piece with outlet holes. The tail piece comprises a hollow discharge rod. It is connected to the hollow rod of the pump. A non-return spring-loaded valve is arranged on the outlet of the hollow discharge rod of the pump.
EFFECT: unit comprises the differential sucker-rod pump, a cylinder of which is connected to a flow column; it ensures more reliable operation of the bore-hole sucker-rod pump unit and reducing serviceability.
FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to recovery of said well located at multihorizon field. Proposed process comprises injection of isolating composition via well tubing string and fitting of "liquid" packer below tubing string shoe. Then, flow tubing above "liquid" packer is filled with killing fluid. Tubing string is withdrawn from the well. Deflector wedge is fitted inside tubing string. Lateral opening is cut in tubing string above overlaying high-pressure productive bed. Side hole is bored through said bed to extend through its entire depth to make side hole face occur nearby said high-pressure productive bed. Casing string with filter is lowered into bored side hole. Casing string is cemented above filter to the roof of top high-pressure productive bed and said wedge is withdrawn. Hanger with latch joint arranged at its inner surface is lowered on temporary string. Said hanger is fitted inside flow string under side opening. Oil string provided with side opening is lowered into flow string till interaction with latch device so that side openings of both strings are located opposite each other. Then, influx from lateral hole is initiated to remove killing fluid from the well. Then, liner with centring funnel at its shoe and packer hanger at its top is lowered on flexible pipe inside oil string to "liquid" packer. Solvent is injected via said liner. Said solvent destructs said "liquid" packer its residues falling on the face. Now liner is lowered to bottom holes of perforation interval of the bottom low-pressure productive bed. Liner is suspended in oil string above side opening of oil string. Flexible pipe is withdrawn from the well to place the well in operation.
EFFECT: efficient recovery.
SUBSTANCE: method for installation of rapid-moving eduction column includes passing the rapid-moving column into a well, engagement of key for interaction with occlusion with nipple occlusion, extending interacting with profile key on rapid-moving column to interact with corresponding stopping profile in well shaft wall and thus supporting the rapid-moving column. In this method, interaction of the key with nipple occlusion causes extending the key interacting with profile into engagement with stopping profile.
EFFECT: higher reliability of holding the rapid-moving column while keeping relatively large flow diameter of the column.
29 cl, 8 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves dilution of salt rock with fresh or subsaline water by cyclic action on the formation, each of which includes pumping of a working agent to the saline oil formation through a well, closure of the well for the time of salt rock dilution, extraction of liquid from the formation through the same well. Cycles of action on the deposit are repeated till full coverage of the saline formation by action before opening of oil deposits contained in it and production of all the extracted oil deposits. Water pumping to the formation is performed at maximum possible constant bottom-hole pressure till reduction of the well water intake capacity by 2-8 times in comparison to its value at the pumping beginning, and extraction of liquid from the formation is performed at minimum possible constant bottom-hole pressure before the liquid with volume of at least 1.1-1.5 volumes of the fresh or subsaline water pumped to the formation earlier is removed to the surface.
EFFECT: increasing permeability of a saline formation throughout the area of its propagation, increasing productivity of production wells, increasing the coverage of the formation by action, volume of the removed oil deposits and acceleration of development rates.
4 cl, 1 tbl
FIELD: oil and gas industry.
SUBSTANCE: invention relates to submersible pumping units for operation of wells, where it is necessary to increase the differential pressure drawdown, without deepening of submersible pumping unit, and/or with unsealed production casing. The unit for oil-well operation includes the tubing string, electric submersible cable, electric submersible pump, the hydroprotection and submersible electric motor of which are encapsulated in the pressure-tight housing, which is tightly closed on the housing of the input unit of the electric submersible pump, the liner consisting from the pipe string the top part of which through the bushing is tightly connected to the bottom part of the pressure-tight housing, and in the bottom part of the liner the branch pipe with external sealing elements is located. The unit contains at least one packer with internal through passage channel with the diameter allowing to pass through the packer the tool, equipment and instruments, without extracting the packer. The sealing unit for the tight connection with the branch pipe of the liner is located either in the packer housing, or in the device below or above the packer.
EFFECT: improvement of performance of recovery of formation fluid from the wells.
FIELD: oil and gas industry.
SUBSTANCE: unit includes the wellhead equipment, concentrically located tubing strings of two diameters with electrocentrifugal and jet pumps in the production casing of the well. There is a separating camera located in the bottom part of the well bore under the centrifugal pump, equipped with the sealing housing. The unit has the channel for passing of the separated oil connecting the annular space above the pump with the separating camera, and inlet holes for entering the separated water. The sealing housing of the electric centrifugal pump from below in the interval of the separating camera is equipped with the inlet device made as the liner damped from below. The liner is divided into sections with the inlet holes. At the level of each inlet hole the liner is equipped with a glass used as a hydraulic lock for petroleum drips and inlet of water from the separating camera. The inlet holes are located in a single row along the liner and are made with the diameters diminishing in each subsequent section upwards. The gap between the housing and production casing of the well is used as a channel for passing of petroleum drips. The tubing string of the greater diameter in the wellhead equipment is connected to the water line, and tubing string with the smaller diameter - with the oil line. The bottom of the string with the smaller diameter is tightly installed in the upper cylindrical camera of the commutator installed in the tubing string with the greater diameter at the depth below the working level of fluid in the well. The commutator has vertical peripheral channels for passing through them of the upward flow of water and bottom cylindrical camera for placement of plug-in jet pump, the output of which is interconnected with the upper cylindrical camera. Meanwhile the possibility of supply of working fluid into the jet pump from the centrifugal pump, and pumped off fluid - along the side channel of the commutator from the annular space of the well through the check valve located from the external party of the commutator is provisioned.
EFFECT: downhole separation of oil from extracted product of the well and separate lifting of oil and water to the surface during inter-well pumping-over of water for maintaining of formation pressure.
2 cl, 3 dwg
SUBSTANCE: as per proposed method, a pressure brine-carrying formation is developed by means of a well; high-mineralised geothermal brine is removed from it along a production casing string. After that, along an annular space between production and intermediate casing strings, which is interconnected via the wellhead with ground reservoirs and delivery equipment, as well as with an absorption zone formed before development of the brine-carrying formation at the interval of a geological cross-section of the well below the unit of a regional water-tight stratum. Brine is removed during opening, development and further operation of the formation to the absorption zone and the ground reservoirs with a possibility of using a hydraulic mineral potential of the brine from the reservoirs. Protection of the production string against deposition of hard formations on its walls from the produced brine during its movement from the formation to the well mouth is performed by temperature control of the upper part of the string at the interval of probable temperature phase transition due to continuous or periodic pumping along the brine flow in the string with a possibility of heat transfer to it of a heat carrier with initial temperature exceeding expected brine temperatures without any temperature control at the interval of probable temperature phase transition. According to the invention, heat carrier pumping is performed inside the brine lifted along the production string by arranging in the same string of a closed circulation circuit with the heat carrier in the form of service water. This circuit is made in the form of a coaxial heat exchanger drawn in the string to the depth that is not less than the value of phase transition interval. It consists of a heat-conducting vertical cylindrical housing coaxial to the string, closed in the base and provided from above with holes for water supply to the housing. Inside the housing there is a central pipeline with an open lower end that does not touch the base and an upper end opened for water discharge above the well mouth. With that, water is pumped first via an annular space of the heat exchanger, which is formed with the housing and the pipeline, in the direction opposite to the direction of brine lifting via the production string; then, it is supplied via the central pipeline to the heat exchanger outlet. Use of hydraulic mineral potential of the brine is performed with discharge of a less concentrated fluid formed at use together with discharged excess brine from the formation and reservoirs to the absorption zone. Before the fluid is supplied to a common discharge line, it is filtered from mechanical impurities.
EFFECT: enhanced method's efficiency.
5 cl, 3 dwg
FIELD: oil extractive industry.
SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.
EFFECT: higher efficiency, higher safety.
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes drilling of operation well, forming in productive bed within feeding range of operation bed of at least one level of main draining system by drilling horizontal shafts from operation well above productive bed, and driving said shafts in radial direction, also, to prevent fast watering of well, before start of its operation, hollows of horizontal shafts are isolated from operation well. In productive bed in feeding range of operation well on one level with main draining system additional draining system is formed, one additional level of main and/or additional draining systems is formed, hollows of operation well and horizontal shafts is additionally connected by hydraulic fracturing of bed, before isolation of hollow of operation well from hollow of horizontal shafts, filter is mounted in the latter, as well as porous oil-attracting hydro-repelling material.
EFFECT: higher efficiency and durability.
6 cl, 2 dwg, 1 ex
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes measuring volume and denseness of fresh oil in reservoir in case of even or balanced temperature and pressure. Combined sample of fresh oil is taken from pipeline during its draining and denseness of oil and bed water and ballast content is determined. Then mass of drained oil is determined with consideration of measured parameters. Prior to draining, fresh oil from reservoir is exposed until partial separation of bed water, and its denseness is measured. During draining of fresh oil, its denseness,, volumetric share of water therein, pressure and temperature are determined. Drained oil mass and percentage of ballast is determined from given mathematical expressions. Denseness of exposed bed water is measured on basis of sample, taken after exposure of fresh oil in reservoir. Denseness of exposed bed water is measured in its flow during draining from reservoir after exposure and before draining fresh oil. Volume of fresh oil in reservoir is measured continuously by its level and data from graduating table for reservoir. Draining of combined sample of fresh oil from pipeline during its draining is performed manually or automatically in case of constant kinetic condition. After exposure of fresh oil in reservoir point samples of fresh oil are taken, additional combined sample is made thereof and denseness of fresh oil, oil and bed water and ballast percentage is determined from it, and these parameters are used when evaluating precision of determining parameters of drained oil. Measurements of denseness, volumetric water share, pressure and temperature during draining of fresh oil in flow are performed periodically with averaging of current values of measured parameters for time interval, equal to period of change of parameters of fresh oil in reservoir. Mass of bed water MW is determined from given formula.
EFFECT: higher precision.
8 cl, 1 dwg
FIELD: mining industry.
SUBSTANCE: method includes compressing gas at compressor station to required feed pressure, and utilization of drop liquid, containing drops of compressor oil and gas, before gas-distributing substation with following pumping of gas into well. Utilization of drop liquid is performed via slanted cylindrical separator of centrifugal type and deep chemical cleaning block in form of two parallel-placed absorbers, operating alternately with replacement of processed absorbents. Separator and two absorbers are mounted at tank for collecting compressor oil.
EFFECT: higher efficiency.
2 dwg, 1 tbl
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes transporting hydrocarbon product along operation channel. Control of pressure changes along this channel is performed. If such change is present such debit of hydrocarbon product is set, which provides for destruction or decomposition of present natural gas hydrates and/or prevention of their forming. With this debit, to place of hydrates decomposition and/or prevention of their forming, alkali solution is fed with concentration 0.04-4.9% with "pH" greater than 10. Alkali solution is fed during time not less than time of pressure change along operation channel, as well as with flow and during time until achieving mass concentration of alkali in gas phase 10-15% of mass.
EFFECT: higher efficiency.
12 cl, 1 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes full raising of cement in behind-pipe space up to mouth, sectioning wells by electro-isolating compounds from oil transporting system or bed pressure support system and use of cathode protection plant as cathode protection station with current controller. For each well time needed for completing cathode polarization of well is determined as well as time for well depolarization, during which potentials on well of cluster are lowered to minimal protective values. On each cluster well cyclic mode of cathode protection plant is performed: cathode polarization during completion of cathode well polarization and well depolarization during lowering potential on well to minimal protective values. During depolarization of one well cathode polarization of other cluster well is performed.
EFFECT: higher effectiveness.
FIELD: oil and gas extractive industry.
SUBSTANCE: device has axial transmission and soft stripe support system. Axis connects electric engine to reducer and connected reducer and leading hub, by means of which transmission lines are actuated. After connection of driven hub and device for supporting pump bars, pump bar for actuating well oil pump can be connected. Leading hub can actuate transmission lines, including one connected to balancer, operating synchronously to operation of well oil pump in both directions. Also, device has base, corbel and platform, controller for controlling oil extraction process, transformer, frequency setting transformer, absolute values encoding means and braking tank. Said electric engine, reducer and leading and driven hubs are mounted on the platform. Controller, through setting frequency generator, functioning as main drive, is connected to electric engine. Controller is connected to encoding absolute values means, capable of displaying working conditions and receiving data about position and rotation angle of leading hub. Encoding means for absolute values and braking block compose a portion of device for determining movement and braking. Controller can contain central processing module, input/output module and liquid-crystal display. Controller can be connected to encoding extension means, immediately receiving data about angle, position and rotation speed of electric engine axis.
EFFECT: higher efficiency.
3 cl, 12 dwg, 1 ex
FIELD: oil-producing industry.
SUBSTANCE: the invention presents a method of purification of the underground potable water at a crude production. The method provides for limitation of traffic of pollutions by construction of boreholes and pumping in of solutions of reagents. Along the contour of the site of possible pollution they make a net of boreholes with the a controlled inter-pipe and drill string-borehole annulue space - a compound - boreholes, the distance between which and a number of steps is chosen depending on porosity and permeability of rocks. The steps of the compound-boreholes are placed perpendicularly to the traffic route of the natural stream of the underground potable water, and a pumping in of the solutions of reagents is made through annulue space and inter-pipe space of compounds - holes simultaneously with a crude and a gas production from a pay. The technical result is a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.
EFFECT: the invention ensures a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.
FIELD: gas extractive industry.
SUBSTANCE: method includes extraction of resource by mechanical drilling and extraction of slurry and rock pieces through well. Gas extraction is performed by horizontal drilling with washing and back expansion, with concurrent cleaning and separation of fresh extracted mixture and accumulation of gas. Delivery of expander of ultra-large working size to expansion place is performed through well subjected for backward expansion. Pressure, temperature and composition of washing liquid is adjusted in such a way, that free natural gas, freed during mechanical drilling, was dissolved in drilling mud and separated from it only after passing of separator through rotating preventer. Expander in form of rocker with cutters is used, expanding well diameter up to ten meters and more.
EFFECT: higher efficiency.
2 cl, 1 ex
FIELD: oil and gas industry.
SUBSTANCE: method includes insertion of compound of foam-forming and gas-forming substances, dissolving these in bed water, and forming of gas and foam and replacement of well liquid with foam, while as foam-forming substance sulphonole is used with sulphamine acid as reaction initiator. Liquid is extracted in two stages: at first stage upper portion of liquid column is piston-effected, at second stage water-soluble foam-forming substance is injected into well with foam stabilizer and reaction initiator, as well as gas-forming substance, while water-soluble foam-forming and gas-forming substances are inserted into well directly after piston-effecting, and water-soluble foam-forming substance additionally has surfactants. Mass of foam-forming substance is determined from conditions: Mff=(0.005-0.01)KMw, where K - component coefficient, Mw - mass of water removed from the well. As gas-forming substance, ammonium carbonate is used in amount 40-50 kg for 100 linear meters of water column in a well. Piston-effecting is performed with productiveness in no less than two times greater than well debit.
EFFECT: higher efficiency.
4 cl, 1 ex, 2 dwg