Method development of a zone-inhomogeneous oil field
The invention relates to the oil industry, in particular to the development of oil fields, and can be used in the development of heterogeneous oil reservoirs. Provides a more effective way by increasing the tempo selection from low permeability zones of the reservoir. The inventive method involves drilling project net production and injection wells, the input of additional injection wells in low permeability reservoir, the change of the direction of filtration flows in the reservoir by changing the mode of production and injection wells that discover low permeability layers. After drilling, field grid reveal kolmat plots in the low permeability zone of the formation, the production wells that discover low permeability layers, and injection wells, uncapped with high permeability. Then in areas with low permeability reservoirs introduce additional injection well with a horizontal shaft. Trunks is directed towards kolmat plot. Pressure in the permeable formation zone support more pressure in the high-permeability zone. Horizontal stvol Il. The invention relates to the oil industry, in particular to the development of oil fields, and can be used in the development of heterogeneous oil reservoirs.There is a method of developing a heterogeneous oil reservoir ( see patent RU No. 2055164 from 08.09.93,, publ. BI No. 6 from 27.02.96, including the allocation of the Deposit of highly productive and low productive areas, followed by placement of injection wells in low productive area and production wells in a highly productive zone, the injection of working agent through the injection wells to the regulation of injection and extraction of oil through production wells, thus shall record the distribution of the mobility of the formation fluid at a late stage of development of deposits and highly productive zone are areas with a monotonic variation of mobility, the development of which are sequential injection of the working agent in the direction of increasing the mobility of the formation fluid, while controlling formation pressure and water cut wells, adjacent to the injection well and included in the area of its impact, the regulation of the injection of the working agent is carried out by reducing the rate of injection with increasing ¾ zones produced between the rows of wells in pairs from different sides of the productive zone at a distance from its edges, defined mathematical expression.The method allows to increase oil production while reducing the production of fluid.The disadvantage of this method is the complexity of implementation and the limited use, because for successful implementation it is necessary to ensure certain conditions of operation and the placement of injection wells.In addition, under conditions of heterogeneous petroleum reservoirs injected fluids are filtered primarily through high permeability zones of the reservoir, and low-permeability remain uninvolved in the development, the current value remains low.There is also known a method of developing a heterogeneous oil field (see the book "Geology and development of the largest and unique oil and gas fields of Russia", t 1, M, VNIIEM, 1996, S. 65), including the drilling of an inhomogeneous field mesh production and injection wells, the input of additional injection wells in low permeability zones of the reservoir, the change of the direction of filtration flows in the reservoir by changing the mode of production and injection wells.The disadvantage of this method is the low current value, because the pickup squag the mi, resulting from the crushing of the grains of the reservoir rock, as a result of these zones remain unreached by the impact of preemptive or injected reagent.The closest in technical essence and the achieved result to the present invention is the method of development of a zone-inhomogeneous oil field (see U.S. Pat. RU # 2118448 from 15.12.96,, publ. BI No. 24 27.08.98, including the drilling grid production and injection wells, the input of additional injection wells, change of the direction of filtration flows in the reservoir by changing the mode of production and injection wells, additional injection wells injected at sites in low permeability reservoir with permeability higher than the average low permeability reservoir, the injection pressure in these wells is maintained at the pressure level of the crack, while in a loop injection of the displacing agent under these pressures producing wells located in low permeability reservoirs, stop.The method allows to increase the oil recovery by increasing the coverage of the influence of low permeability zones of the formation.However, the rate of oil extraction from samokonservatsii deposition the solid particles is comparable with the pore size of the low permeability of the reservoir.The technical object of the present invention is the increased efficiency of the development of a zone-inhomogeneous oil fields by increasing the rate of selection involved in the development of reserves of low permeability zones of the formation.The problem is solved is described by way of the development of a zone-inhomogeneous oil fields, including drilling project net production and injection wells, the input of additional injection wells in low permeability reservoirs, the change of the direction of filtration flows in the reservoir by changing the mode of production and injection wells that discover low permeability layers.What's new is that after drilling field grid, identify kolmat plots in the low permeability zone of the formation, the production wells that discover low permeability layers, and injection wells, uncapped with high permeability, then in areas with low permeability reservoirs introduce additional injection well with a horizontal shaft, and the trunks are directed towards kolmat plot, and the pressure in the deposition zone of the reservoir supported above the pressure in udkast during well operation on the spout.New is also that as a displacing agent for injection into the injection well with a horizontal wellbore using reagents based on the properties of low permeability formations, such as clay - saline produced water or compositions based on anionic and nonionic surfactants.The proposed method differs from the prototype sequence of technological operations and the availability of new features that improve the development efficiency of a zone-inhomogeneous oil fields by increasing the rate of selection involved in the development of reserves of low permeability zones of the formation.From the patent and scientific literature is unknown to us declare the set of distinctive features, therefore, the claimed method meets the criterion of "significant differences".In Fig. 1 schematically shows the design stage of a zone-inhomogeneous field before applying the proposed method. In Fig. 2 - introduction injection well with a horizontal shaft. In Fig. 3 schematically shows the development status of a zone-inhomogeneous oil fields after the application of the proposed method.According to the plans the location of the drilled vertical wells and built lithological maps reveal producing wells that discover low permeability layers, and injection wells, uncapped with high permeability, as well as areas with low permeability reservoirs. Then on this site of injection wells (3) are drilling horizontal sidetrack, directing it in the direction of maximum spread of low permeability zones of the reservoir (Fig. 2). Depending on the design of the wells (diameter of the production string and others), the thickness of the deposition layer, its strength and other horizontal wellbore may obzivatsya column or operated by the open trunk. In the lateral horizontal trunk of the zone with the lowest permeability values reveal a deep perforation. Possible hydraulic fracturing. Well equipped with equipment and tools, which allows the injection of the displacing agent with pressure on allopregnanolone injection into a horizontal shaft supported above the pressure in the injection wells, uncapped with high permeability. Organization of injection of the displacing agent in the deposition area of the reservoir with high pressure allows the change of filtration flows in the reservoir and to clean up the clogged part of the reservoir. Solid particles are entrained in the high part of the reservoir and carried away through the borehole to the surface. The lower filtration resistance of the reservoir system due to its purification, increased filtration area horizontal wellbore injection wells in low permeability of the reservoir, increased downhole pressure help to provide a stable injection wells and accordingly the selection of fluids from producing wells.To improve development efficiency, low permeability formations and prevent clogging of the reservoir system using saline produced water. It is known that the use is compatible with the reservoir environment of highly mineralized formation water displacement factor above, is less clogging of the porous medium, than other waters.For improved responsiveness low permeability formations are of interest composition of nonionic and anionic poverino. The last combined in one product the best properties of nonionic (good compatibility with saline fishing waters) and anionic (high surface activity of the surfactant. Such compositions provide the reduction of interfacial tension on the border "oil-water" up to 10-2-10-3mn/mWhen the attenuation pickup unproductive reservoir need to be able to let the well to clean up by putting it on the mechanized extraction of product from the reservoir. Therefore, the horizontal wellbore to be drilled below the estimated dynamic level.The set of distinctive features can improve oil recovery by increasing coverage of low permeability zones of the reservoir (Fig. 3).A specific example of the wayZone-inhomogeneous plot deposits of oil (Fig. 1) drilled five wells, one injection and four operators. The distance between the wells 400 feet,Wells opened the oil-saturated reservoir with an average permeability, respectively, of highly - 0,750 μm2permeable - 0,200 μm2. In highly permeable reservoir well No. 2 permeability is 0,500 μm2. Permeability low permeability No. 5 - 0,300 μm2.These data indicate that the Deposit is of a zone-inhomogeneous. Balance reserves deposits amounts to 800 thousand tons, including low permeability zone of the reservoir 160 thousand tons After drilling zone of the well came into production with an average rate of deposition on the layer 5 tons/day (Fig. 1).After selecting 1.6 thousand tons of oil flow rates of producing wells 1, 4, 5 decreased to 0.5 t/day. The injection capacity of the well # 3 decreased from 150 mC/day in the initial stage of operation of the site to 135 mC/day.On the basis of the conducted research in low permeability zone of the formation from the injection well # 3 was drilled horizontal sidetrack, oriented in the direction of maximum spread of low permeability zones of the reservoir (Fig. 2).The injection of water into the injection well No. 3 in the amount of 100% of the fluid extraction in situ was carried out within 4 months. Increased extraction of fluid from the well No. 2 reservoir injection pressure in the high permeability of the reservoir is maintained at 1.5 MPa lower than in low permeability.Further operation of the site showed that the commissioning of the injection wells with lateral shaft # 3 was allowed to reach near the productive area of the reservoir up to 10 t/day. The recovery factor low permeability zones of the reservoir amounted to 41% (Fig. 3).Technical and economic efficiency of the proposed method of development of a zone-inhomogeneous field of the sum due to involvement in the development of low permeability zones of the reservoir and increasing the rate of selection of them, which increases the current value of the field as a whole.
Claims1. Method development of a zone-inhomogeneous oil fields, including drilling project net production and injection wells, the input of additional injection wells in low permeability reservoir, the change of the direction of filtration flows in the reservoir by changing the mode of production and injection wells that discover low permeability layers, characterized in that after drilling field grid reveal kolmat plots in the low permeability zone of the formation, the production wells that discover low permeability reservoirs and injection wells, uncapped with high permeability, then in areas with low permeability reservoirs introduce additional injection well with a horizontal shaft, and toderive above the pressure in the high-permeability zone, the horizontal barrel spending below the estimated dynamic liquid level during operation of the wells on the spout.2. The method according to p. 1, characterized in that the displacing agent for injection into the injection well with a horizontal wellbore using reagents based on the properties of low permeability formations, such as clay - saline produced water or compositions based on anionic and nonionic surfactants.
FIELD: oil and gas production.
SUBSTANCE: groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.
EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes construction of wells and oil and gas collection system, forcing water from water-bearing level into oil deposits, flow of oil from oil deposits into secondary deposit and following extraction of oil from secondary deposit for useful implementation. Resources of deposit are separated on basis of natural energy characteristic on screened and having rigid water-forcing mode. Deposit is operated by three well types. Of the latter flow wells connect oil deposits to secondary deposit for flowing and collection of oil in upper bed under effect from gravitation. Balancing wells connect screened deposits and secondary deposit to water-forcing level for balancing of bed pressures and preventing loss of rocks stability. Extraction wells connect secondary deposit to oil and gas collection system. Selection of bed for secondary deposit is performed from number of highly penetrable beds, having maximally allowed excess over oil deposits.
EFFECT: higher oil yield, higher effectiveness.
5 cl, 3 dwg
FIELD: oil extractive industry.
SUBSTANCE: method includes drilling of deposit according to row-wise non-even grid of wells with distance from force to extractive rows, greater than distance between extractive rows, pumping of displacing gent into force wells, extraction of product from product wells and transferring of displacing agent pumping front to extraction area. According to invention, transferring of displacing agent pumping front to extraction area is performed by drilling side horizontal shafts in all wells of force row and directed towards extractive row by beds ad zones with most remainder oil saturation level. Then among these wells are singled out, horizontal shafts of which pass along beds and areas with lesser oil saturation level. Pumping of displacing agent is restarted, and other wells are transferred to product category. These wells are operated with face pressures lower than saturation pressure until reaching 98% water saturation level. After that pumping of displacing agent is restarted along all other wells of force row. During that, rows of extractive wells are operated in normal mode.
EFFECT: higher efficiency.
FIELD: oil industry.
SUBSTANCE: according to first variant of method, force and product wells are drilled, working agent is fed through force wells, oil is extracted through product wells, dome-like raised portions are marked out, which surpass absolute marks of bed, additional wells are positioned in these portions. Wells placement is planned at tops of dome-like raised portions even with breach of evenness of planned well mesh. After full drilling of wells mesh and in case of more accurate definition according to data of drilled wells of deposit of dome-like portions side shafts are drilled from adjacent wells towards more precisely defined tops of dome-like portions, controlling the deposit. In adjacent wells and side shafts, positioned on tops of dome-like raised portions , range of productive bed is opened between absolute mark of ceiling in this well and absolute mark, appropriate for ceiling in closest well. According to second variant of method practically analogical operations are realized as in first variant, except when absolute mark of ceiling of productive bed according to adjacent wells is lower than mark of sole of productive bed, whole bed is opened in side shafts.
EFFECT: higher efficiency.
2 cl, 2 dwg
FIELD: oil reservoir development, particularly for developing water-flooded ones.
SUBSTANCE: method involves withdrawing oil through production wells and ejecting working substance through ejection wells. To prevent water ingress from well bore into oil-saturated formation area formation is perforated in water-oil interface zone so that lower part of oil-saturation formation interval and upper part of water-flooded formation interval are penetrated. This provides oil relative permeability retention in oil-saturated formation area. To prevent formation mudding during initial perforation thereof drilling is performed in depression, balance and repression modes with pressure of not more than 3 MPa. As far as oil is depleted perforation interval is extended towards oil-saturated formation area.
EFFECT: possibility to retain oil relative permeability of oil-saturated formation area.
2 cl, 2 dwg
FIELD: oil field development, particularly for ones with nonuniform reservoirs.
SUBSTANCE: method involves drilling injection and production wells; flooding oil reservoir and extracting oil out of well; defining more exactly geologic aspects on the base of drilling results; designing and drilling additional wells with horizontal bores or drilling horizontal bores from existent wells; determining location of reservoir drive zone boundaries; calculating volume of dead oil located near drive zones; drilling horizontal bores from existent wells located near drive zones and/or new wells with horizontal bores located in above zone, wherein horizontal bores are drilled in direction perpendicular to drive zone boundaries.
EFFECT: improved oil recovery.
2 dwg, 1 ex
FIELD: oil industry.
SUBSTANCE: method includes drilling vertical product and force wells, extracting oil from product wells, forcing working agent through force wells, making side horizontal shafts in force wells, forcing working agent through side horizontal shafts of force wells. Additionally, side horizontal shafts are made in extraction wells. Oil is taken through side horizontal shafts of extractive wells. With pressure in the well, decreased for 5-10% from hydrostatic pressure, all side horizontal shafts are made by washing away rock under pressure of fluid of around 15-20 mPa. Direction of all side horizontal shafts is set to be parallel to rows of wells.
EFFECT: higher oil yield.
1 ex, 1 dwg
FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons.
SUBSTANCE: method involves drilling production and injection wells and maintaining formation pressure; performing seismic works to determine volumetric routing of natural macrocrack system with lateral and depth routing; forming production and injection macrocracks of above system; drilling wells to corresponding macrocracks and forming producing well-macrocrack systems for oil production and injection well-macrocrack for formation flooding or production well-macrocrack for oil production and system including vertical and/or horizontal multibranch wells for formation flooding or injection well-macrocrack system for formation flooding and system including vertical and/or horizontal multibranch production wells for oil production or production well-macrocrack system, injection well-macrocrack system and system including vertical and/or horizontal multibranch production and injection wells.
EFFECT: increased efficiency, oil recovery and production well injectivity, as well as increased sweep efficiency and oil recovery ratio.
FIELD: oil production industry, particularly oil deposit development.
SUBSTANCE: method involves pumping working agent, namely water, in two stages. The first stage is performed with the use of power pumps. The second one is carried out by means of hydraulic measuring pumps, which are used to convert injection pressure created by power pumps. If it is necessary to increase pressure in water lines used to deliver water to separate injection wells pressure is regulated in accordance with necessary water volume to be injected in wells on the base of collecting properties of oil formations in bottomhole formation zones. This is performed by providing change in pump piston diameter and stroke ratios in the first and the second sections of hydraulic measuring pumps, which are selected on the base of hydraulic resistance variation depending on water flow velocity. Parameters characterizing injection system operation are simultaneously measured and efficiency of the method and equipment operation is detected from above characteristics.
EFFECT: increased efficiency of oil bed development due to energy-saving equipment and technique usage for formation pressure maintaining.
2 cl, 2 dwg
FIELD: enhanced recovery methods for obtaining hydrocarbons.
SUBSTANCE: method involves flooding production bed through injection wells with the use of pump units. In the case of terrigenous porous productive bed flooding acoustical sound resonators with resonance frequency setting are installed in injection line. This eliminates amplitude of alternating low-frequency liquid pulsation sound generated by pump units. Method also involves providing constant compression mode in productive beds and frontal oil drive from productive bed.
EFFECT: increased operational reliability.
1 ex, 3 dwg