Development method of high-viscosity oil deposit. RU patent 2506417.
 Method of developing oil pool using horizontal multibranch wells / 2505668Method consists in drilling vertical pressure wells and horizontal producers, in pumping heat carrier through pressure wells, and in withdrawal of production via horizontal producers. Producers are made as multibranch horizontal wells which are drilled upwards oil-water contact, and vertical wells are made at distance not less than 50 m from bottoms of multibranch horizontal wells. Opening of vertical well deposits is made again upwards and downwards of respective bottom of horizontal well, casing string is landed to each injection well and packer is set between openings, displacement agent is pumped through the upper opening into tubular annulus and through the lower opening into casing string. |
 Assembly for development of wells with low-permeable beds with use of hydraulic jet pumps and pressure pulse generators / 2503803Assembly includes shank, packer, return valve, hydraulic jet pump. According to invention the assembly additionally includes second hydraulic jet pump and pressure pulse generator, the latter of which is mounted at the interval between hydraulic jet pumps and is capable of operation under the influence of working fluid pumped by tubing string. Note that pressure pulse generator has turbine stages - stators with holes and rotors with gates capable of regular closing of holes in stators that are fixed against turning relatively each other, like rotors, for sudden changing of stream velocity through hydraulic jet pumps. |
 Method for oil and gas well cleaning in productive formation area and device for its implementation / 2503796Method for oil and gas well cleaning in productive formation area consists in location of hydro-pulse device at pipe string at the zone of productive formation with formation of annular space. Pumping of flushing fluid at direct and reverse flushing of the well with flushing fluid annular circulation through pumping unit. Hydro-pulse influence and active fluid pumping into the formation by converting the downstream in pipes' cavities into the pulsing upstream in annular space. Elimination of colmatant from formation by multiple automatic alternation of hydro-pulse and momentary depressive effect on productive formation zone. Device for oil and gas well cleaning contains hollow casing with ring lug and conical surface. Cross-beam with axial channel connected to bush and interacting with casing ring lug. Bush and disk valve with axial channel spring-loaded by one spring. Pusher with top projection. Nut located on pusher cylindrical surface of large diameter capable of fixed movement. |
 Method and system for production of hydrocarbons from hydrate formation using blowdown gas / 2502863Production method of hydrocarbons from a hydrate formation containing hydrocarbons involves the following stages: provision of a production well interconnected with production equipment and hydrate formation containing hydrocarbons and interconnected with free space above hydrate formation and containing dissociated hydrocarbons and water; and b) passage of blowdown gas through free space for removal of dissociated hydrocarbons and water from hydrate formation and transportation of dissociated hydrocarbons and water to the production well. |
 Method for combined production and processing of hydrocarbons from natural gas hydrate manifolds and common hydrocarbon manifolds (versions), and system for its implementation / 2502862Production method of hydrocarbons from many hydrocarbon manifolds involves the following: production of the first mixture of water and hydrocarbons including at least oil and/or natural gas at least from one common hydrocarbon manifold and transportation of the first mixture to a collection station including a water separator for processing of the first mixture of water and hydrocarbons; simultaneous production of the second mixture of water and natural gas at least from one natural gas hydrate manifold and transportation of the second mixture to the collection station for processing of the second mixture of water and natural gas; and processing of the first and the second mixtures using the collection station at least for partial separation of water and hydrocarbons from the first and the second mixtures. |
 Development method of oil deposit located above gas deposit and separated with non-permeable interlayer from it / 2502861Method involves drilling of vertical and horizontal production and injection wells in oil deposit, pumping of working fluid to injection wells and extraction of products from production wells. Drilling of an additional horizontal well in gas deposit is performed; then, branches directed upwards through a non-permeable interlayer with outlet of branches to oil deposit are drilled out of it. Water is pumped from the head to the additional horizontal well so that gas-water mixture is formed in the same well. At gas leakage to shafts of production wells, product extraction from the same wells is reduced by 40-50% till bottomhole pressure in them is recovered. After that, product extraction from the same wells in previous volume is continued. |
 Installation for water-alternated-gas injection to oil formation / 2500883Installation includes centrifugal pump for operating liquid pumping without gas, run-down lines for basin and liquid, two tanks with air inlet valves and pressure control valves located in the upper line, bleed-off lines and liquid pressure lines located in the lower parts and symmetrical high-pressure and low-pressure taps communicating with discharge and suction of the pump. According to invention at water input line in parallel to the main centrifugal pump there is an additional pump which discharge side communicates with operating nozzle of liquid-gas ejector, receiving chamber of the latter is connected to gas line and discharge is connected to upper parts of tanks. At the line of liquid input to ejector there is regulating valve and choke connected in series. Gate of the regulating valve is connected hydraulically to discharge of ejector and input to choke. |
 Method of development of oil pool located above gas pool and separated therefrom by impermeable parting / 2499134Proposed method comprises drilling of vertical and horizontal production and injection wells, injection of working agent in injection wells and oil extraction from production wells. Additional horizontal wall is drilled to penetrate through impermeable seam between oil and gas pools. Then, branches are drilled from horizontal borehole directed upward to terminate to oil pool and downward to gas pool. Now, hydraulic fracture is performed in horizontal well in interval of impermeable section to form hydraulic fractures to communicate oil and gas pools. In operation, fixed extraction of products is performed in production wells at oil pool. At penetration of gas into production wells, viscous fluid is objected in extra horizontal well to eliminate gas ingress in said well. |
 Method of natural gas extraction from hydrocarbon hydrates with simultaneous retention of carbon dioxide in subsurface formation / 2498057Method involves the following stages: carbon dioxide gas is supplied to deposits of methane hydrates; action of carbon dioxide gas is provided to methane hydrate with methane release and accumulation of carbon dioxide gas in the form of carbon dioxide hydrates; released methane is removed. At that carbon dioxide gas is supplied as carbon dioxide gas in supercritical state under pressure more than 7.4 MPa and stored at temperature more than 31.48°C. |
| Oil deposit development method / 2498056 Method includes water-gas mixture pumping to injection well and plugging material to production well in order to increase oil recovery factor and to decrease hazards of premature gas leakage. According to the invention treatment of injection and production wells is made simultaneously. At that water-gas mixture is pumped to injection well in ration of gas and water equal to 2:1 and pumping volume equal to 1.6 of oil-saturated pores in the formation. Plugging material is pumped to production well on cyclic basis. In each subsequent cycle volume of plugging material is reduced per 20-30%. At that volume of plugging material pumping does not exceed 20% of highly permeable pores of the formation. Associated gas or natural gas or their mixture is used as gaseous agent while polymer-silicate compound is used as plugging material. |
 Method for intensifying oil extraction / 2244106Method 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. |
 Method of joined development of oil and potassium deposits / 2244107Invention comprises following scheme. Oil is produced from producing wells. Potassium salts are extracted from mines and processed. Solutions are pumped into deep lying porous rock formations preliminarily revealed between oil-bearing and potassium formations. Those porous rock formations are chosen which are located below underlying stone salt. Pumping of solutions is effected through injecting wells until pressure drop in oil-bearing formation is compensated to a value sufficient to prevent deformation in potassium formations, this value being calculated using special math formula. Oil formation is then run while maintaining compensating pressure in chosen porous formation. |
| Method of treating bottom zone of well / 2244108 When treating well bottom zone, the latter is exposed to magnetostriction action under conditions of 50% depression of formation pressure. Magnetostriction action is carried out from the roof to the subface of formation including stepwise treatment of each linear meter for 2.5-3.5 h. |
| Method of treating bottom zone of well / 2244109 When treating well bottom zone, a reagent, in particular water-oil emulsion with up to 30% water and with surfactant additives, among them nonionic components, is pumped into formation. Number of electric discharge pulses is set basing on real porosity of formation taking into consideration empiric dependence of the number of electric discharge pulses per 1 m of formation on the porosity of rocks, which dependence was preliminarily obtained on core material. Pulse treatment of bottom zone of well is effected in a reagent medium with electric discharges from electric-discharge machine, which is displaced and periodically fixed for treating a local area of well bottom zone. |
 Method for extracting oil and gas deposit / 2244807Method includes pumping of replacing agent through force wells. Cyclic vibro-seismic treatment with alternating frequencies is performed on bed, using ground vibration sources. Composition and amount of extracted fluid is determined after and before treatment. Dominating frequencies of bed are detected on basis of reaction of micro-seismic noise thereof on vibro-seismic treatment. Additional vibro-seismic treatment is performed by signal being a total of at least two monochromatic signals with frequencies equal to dominating frequencies of block of productive oil deposit bed. Treatment is performed till development of cracks, while placing blocks in resonance oscillations, and separating of inner potential energy, providing for intensification of processes of forming of clusters in extensive zone from blocks of productive bed having different sizes. |
 Method for treatment of face-adjacent well area / 2244808Method includes lowering assemblage with brushes on tubing column into perforation interval. Interval is filled with chemically active environment. By driving tubing column, assemblages are rotated and concurrently reciprocally displaced. Inter-tubular space is separated above perforation range. Bed is drained with forming of sign-alternating liquid displacement in perforation interval and weak depression pulses. Washing out of treatment products is performed by pumping out reaction products with dirt through apertures in the brush. |
 Method for extraction of oil deposit / 2247828Method includes pumping working agent into wells of force rows and/or locked force blocks, extraction of liquid and gas from extraction wells, separation of force and product wells on portions and groups and physical effect on productive beds, in particular change of direction of filtering flows. Prior determination of relative remainder extracted oil deposits in productive bed is provided along watered product wells and portion as a whole. Calculation of adapted, on basis of parameters of oil displacement in whole portion, oil saturation level in product of liquid for values of relative remainder oil resources in each product well. Than product wells are singled out, in which actual oil level is not less than adapted for relative remainder oil resources of this well. These wells together with water-less wells are left in constant operation in mode of maximal liquid extraction. Remaining extraction wells as well as force wells are enabled in periodical operation in groups. At the same time in one semi-cycle a group of force wells is enabled in operation in mode of minimal working agent volume pumping mode, and product wells being in area of effect of these - in mode of maximal liquid extraction, or vice versa. In following semi-cycle modes of operation of product and force wells are swapped with opposite ones. Grouping of product wells and modes of their operation are corrected in accordance to changes of relative remainder extracted oil resources, actual and adapted oil level in wells in time. |
 Method for heat-wave processing of bed / 2249683Method includes concurrent heat and wave processing of bed. Said effect is performed by feeding heat carrier into bed through pressure oscillations generator, mounted in force or extracting wells. Wave effect is performed with value of oscillations frequency, which are determined from analytical dependencies. |
 Method for controlling extraction of oil deposit / 2254455Method includes taking oil from product wells, forcing water into force wells, maintaining face pressure at product wells higher than oil pressure of gas saturation, and at force wells - lower than pressure of bed hydraulic fracturing. Well operation technological modes are measured, pressure restoration curves are taken, filtering parameters of bed are determined. According to invention for each of wells, with consideration of their interference, partial derivative of total deposit oil debit is determined on basis of face pressure. Then by utilizing partial derivative of total oil debit on basis of face pressure graph of total oil extraction is built dependent from totals of absolute values of depression and repression. On basis of characteristic bend on the graph optimal mode of technological effect on deposit is determined and realized. |
| Method for extraction of water-clogged oil deposit / 2255212 Method includes determining dominating frequency of productive bed by performing prior vibration-seismic action using surface oscillations source at different frequencies and analysis of seismic graphs from seismic receivers in product wells. Vibration-seismic effect on watered portion of productive bed of oil deposit is performed by a group of surface oscillations sources, operating at dominating frequency of productive bed. Bed fluid is extracted via product wells. After vibration-seismic effect on watered portion of productive bed of oil deposit by a group of surface oscillations sources, operating at domination frequency of productive bed, concurrent vibration-seismic effect is performed using two sub-groups of said group of surface oscillation sources. Each sub-group of group operates at determined from mathematical dependence. Average frequency of surface oscillations sources of whole group is equal to dominating frequency of productive bed. Difference in frequencies, on which each sub-group operates, is determined in accordance to linear size of watered portion of productive bed of oil deposit and is satisfactory to mathematical dependence. Concurrent vibration-seismic effect by two sub-groups of said group of surface oscillations sources is performed with forming of wave having length exceeding length of wave with dominating frequency. |
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil producing industry. In development method of high-viscosity oil deposit that includes drilling of vertical injection wells and horizontal directional producers, pumping of operating fluid through injection wells and oil withdrawal through producers, determination of oil-water contact (OWC) level the horizontal directional producer is drilled from mouth to downhole at the level at least per 2-3 m higher than OWC level; vertical injection well is drilled so that its downhole is located over producer downhole per 5-8 m. The producer is perforated along it hole length while the vertical injection well is perforated in the stratum area in direction towards the producer mouth. Stage by stage as operating fluid breaks through or water cut exceeds 95% downhole of the horizontal directional producer is cut off above the breakthrough or watercut area and the area of injection well penetration is cut off from below per 1/3 - 1/2 of its whole length. When production of the production area is completed the mouth of horizontal directional producer is placed under pressure of operating fluid.
EFFECT: working efficiency in the deposit with inclined oil-water contact, reducing watercut rate of the product extracted from the deposit, excluding breakthrough of heat carrier to the producer with simultaneous reduction of expenditures as construction of additional injection well is excluded.
1 dwg
Offer applies to the oil industry, namely, the way of development of deposits of high-viscosity oil.
There is a method of development of deposits of high-viscosity oil (RF patent №2062865, IPC 21 43/20, publ. in bull. №36 of 27.06.1996), in accordance with which the Deposit of high-viscosity oil Buryat vertical injection and horizontal production wells. Fluid injected through the injection wells and simultaneously periodically through horizontal wells until the break of coolant to the vertical producing wells. After the breakthrough of the heat carrier through injection wells pumped displacement agent, and through horizontal wells carry out the selection of sand and reservoir fluid.
The disadvantage of this method is that it does not allow to develop oil reservoir with achievement of high oil recovery. Probable fast-break the coolant from the injection well in mining, which reduces efficiency and increases the cost to implement.
Closest to the technical nature and the achieved result is a way of development of deposits of high-viscosity oil (patent RU №2334095, IPC 21 43/24, publ. 20.09.2008), including the drilling of vertical injection wells and horizontal wells, injection of the agent through injection wells and oil withdrawal through production wells. Horizontal wellbore production well spend 1.5-2.5 m above the sole of the productive formation and perforate. Above the horizontal of the trunk of the production well 3.5 to 4.5 m placed bottom of a vertical injection wells, punched in the range of 0.5-1.5 m from the bottom. Vertical injection well placed from the vertical shaft of the production well at a distance of greater than 2/3 of the length of the horizontal section of the production well, until the end of the horizontal wellbore, as the agent of the steam used in alternation with the air.
Disadvantage of this method is the probability of rapid breakthrough coolant due to the small distance between the bottom of the extraction and injection wells (3,5-(3,5-4,5 m). In this context, the high costs and low efficiency. Method is not suitable for development of deposits with sloping contact.
The technical objectives of the process are functioning in deposits with sloping contact, lowering the water cut from the reservoir, the exception breakthrough of the heat carrier in the production well, reducing the cost of exclusion construction of additional injection well.
The technical problem is solved by a method of development of deposits of high-viscosity oil, including the drilling of vertical injection wells and horizontal wells, injection of the agent through injection wells and oil withdrawal through production wells.
What is new is that determine the level of the oil-water contact (KSS), mining of horizontal horizontal from the mouth to the slaughter well Buryat with the location of at least 2-3 m above the level of VNK, vertical injection well Buryat with the location of the slaughter on-bottom of the production well above 5-8 m, perforate producing well on all length of gradient section, vertical injection well perforate in the area of the reservoir towards the mouth of the well, in stages as a breakthrough working agent or irrigation products above 95% slaughter extractive horizontal well cut above the zone of a breakthrough irrigation zone and the opening of the delivery chink cut off the bottom 1/3-1/2 of the whole of its length, in providing all of the zone of the mouth of the extractive directional, horizontal wells translated by injection of the agent.
The drawing shows the layout of vertical injection well and the tilt-a horizontal well.
Way of development of deposits of high-viscosity oil is as follows.
In the productive formation 1 determine the level of the oil-water contact (KSS) 2, in case the level of VNK inclined 2', determine the angle. Next Buryats and equip horizontally-sloping producing well with 3-slaughter above the level of VNK 2 at least 2-3 m, through which goes selection of products of the reservoir 1. Perforate hole 3 around the trunk. In case of development of deposits with sloping level of VNK T tilt-3 horizontal well drilled above KSS T with distance from it at least 2-3 m Next drilled a vertical injection wells 4 with the location of the slaughter at a distance of 5-8 m on-bottom horizontal inclined extractive wells 3. After construction of the vertical well 4 through it is pumped working agent. As a working agent steam is used, for example, with a temperature of 180 to 250 OC and dryness of 0.8 D. units To reduce heat loss and a steam chamber over the pan and horizontal wells 3 discharge vertical borehole 4 perforate towards the mouth of the pan and horizontal wells 3. Further on a way of stages as a breakthrough coolant or achievements percent irrigation products above 95% slaughter extractive directional, horizontal wells 4 cut above the zone of rupture, or irrigation. Insulation section of the wellbore or breakthrough coolant in it, you can use various deaf packers or compositions, as well as, for example, clay or cement mortar. In the case of timely isolation area of problem can almost completely eliminate the problem of breakthrough coolant, thereby achieve savings during injection of the agent, and also to prevent a drop in pressure, which gives a high influx of products in the production well. Zone opening injection well cut off the bottom 1/3-1/2 of the whole of its length, for example, deaf packers or compounds. Such a decision is caused by the fact that with a small (5-8 m) distance between face extractive 3 and discharge 4 wells allows to reach production at an earlier stage of operation of the reservoir 1, but while the same can break working agent. Consequently, after warming up inter-well bottom zone injection well bottom 4 should be isolated, then the injection of the agent is to be made in the upper interval of productive layer 1, and thus the resulting steam Luggage over mining pan and horizontal wells 3 will push the products of upstream of the reservoir 1, the decision gives less possibility of breakthrough working agent. When developing overall power zone mouth of the extractive directional, horizontal wells 3 translated by injection of the agent.
The offered way of development of deposits of high-viscosity oil was implemented at the Deposit with the following geological and physical characteristics:
Average depth of the object - 85 m
The average total thickness of layer - 26 PM
The level of VNK - 84 m
The value of the initial reservoir pressure - 0,45 MPa.
The initial reservoir temperature is 8 degrees C.
Density coefficient of oil in the reservoir conditions - 0,965 kg/m
The coefficient of dynamic viscosity of the oil in situ - 12000 MPa·C.
The coefficient of dynamic viscosity of the water reservoir conditions - 1.3 MPa·C.
The value of the average permeability of the core in the reservoir - 1500 microns.
Average porosity of core in the reservoir - 0.08 D. units
Above inclined level KSS T at a distance of 2.5 m built pan and 3 horizontal well with a length of horizontal horizontal section 150 m, which hydromechanical hammer PGM-120 throughout. Built a vertical borehole 4 with the placement of a face 6.8 m above the bottom of the borehole 3. In the borehole 4 again opened layer 1 on the length of 12 m unilateral hydromechanical hammer PGM-0-120 towards the wellhead 3, orientable in the borehole with the help of geophysical navigation equipment. At break of a heat carrier bottom part of the wells 3 at a distance of 40 m from the face filled the mud solution. Vertical borehole 4 at a distance of 5 m from the face filled with cement mortar, exclude completely the possibility of breakthrough fluid from the borehole 4 in the hole 3. Continued operation of wells 3 and 4 until all the water flooding products (above 95%) in the production wells 3 moved by injection of the agent. As a result of the use of the proposed method has allowed to receive the accumulated oil production by 12% higher than the closest analogue.
The presented method, and the method of the prototype were simulated in software complex CMG module STARS on the object with the same geological and physical characteristics for different operating conditions. From the obtained results also revealed the advantage of a method before prototype: lowering the water cut from the reservoir, the exception breakthrough of the heat carrier in the production well, cumulative oil production is higher than the prototype, by 10-15%.
Way of development of deposits of high-viscosity oil, including the drilling of vertical injection wells and controlled directional horizontal wells, injection of the agent through injection wells and oil withdrawal through production wells, characterized in that determine the level of water and oil contact - VNK, mining tilt-horizontal, from the mouth to the slaughter well Buryat with the location of at least 2-3 m above the level of VNK, vertical injection well Buryat with the location of the slaughter on-bottom of the production well above 5-8 m, perforate production well along the entire length of gradient section, vertical injection well perforate in the area of the reservoir towards the mouth of the well, in stages as a breakthrough working agent or irrigation products above 95% slaughter extractive directional, horizontal wells cut above the zone of rupture, or irrigation zone and the opening of the delivery chink cut off the bottom 1/3-1/2 of the whole of its length, in providing all of the zone of the mouth of the extractive directional, horizontal wells translated by injection of the agent.