The way to develop heterogeneous hydrocarbon deposits
The invention relates to the oil and gas industry and can be applied in the development of terrigenous deposits of hydrocarbons, complicated by the presence of zones of different permeability. Improves the efficiency of the heterogeneous development of oil deposits at the expense of a more rational approach to selecting systems development using data from a detailed study of sedimentation. The inventive method comprises the steps of drilling on the area of deposits and production of hydrocarbons through the production wells. According to the invention for deposits, alluvial deposits, at the stage of drilling on the rare grid according to geophysical and core research building map lithological facies sediments in the reservoir. Within floodplain sediments with low permeability and high ruggedness deposits net wells condense. Within the fluvial deposits net condense on the stage lowerbody hydrocarbon reserves. 1 Il.
The invention relates to the oil and gas industry and can be applied in the development of terrigenous deposits of hydrocarbons, is complicated by the presence of zones with razvedenia first wells on the thinness of the net produce of their research and determine the direction between the two wells with the highest interaction with each other, then the vertical and horizontal trunks new production wells are located in the gap between the two wells with the highest interaction, and horizontal trunks are placed perpendicular to the direction between the two wells (U.S. Pat. 2010955 of the Russian Federation, IPC 5 E 21 In 43/30, E 21 In 43/20, publ. 1994).
The disadvantage of this method is that the hydrodynamic coupling between the two wells drilled by the sparse grid may not be oriented in one direction (for example, wells can be drilled on the bend of paleolake, the second well may be associated with the first fault), so well drilled between them, can get into the zone with low permeability. Rasborinae reservoir according to this principle, when the change in the geological structure it can be difficult to transform the selected system in the conventional development system, including uniform location of wells in areas with similar reservoir properties (CFP), which will lead to uneven development of reserves and subsequent reduction of the oil recovery factor (CIN).
The technical result of the invention is the increased efficiency of the development of heterogeneous oil reservoirs for MF the building.
The technical result is achieved in that in the method of developing heterogeneous deposits of hydrocarbons, providing the phases of drilling on the area of deposits and production of hydrocarbons through the production wells, according to the invention for deposits, alluvial deposits, at the stage of drilling on the rare grid according to geophysical and core research building map lithological facies sediments of the reservoir, at the same time within floodplain sediments with low permeability and high ruggedness deposits net wells compacted, and within the fluvial deposits net condense on the stage lowerbody hydrocarbon reserves.
The drawing shows the layout of the wells in the reservoir, where the numeral 1 indicates a well drilled on a sparse grid, 2 - projected wells, 3 wells drilled on a sparse grid, but caught in channel deposits, broken line (- -) denotes the boundary of the fluvial deposits.
The method is implemented as follows.
The reservoir in which the reservoir rock are alluvial sediments, razvarivat rare wells, which, as necessary, adapted to the given geological conditions using any sidetracking).
At the stage of drilling deposits map construction facies deposits. This is done using geophysical data and drill core studies. Currently available methods of processing this information enable you to highlight in the reservoir lithofacies and, thus, to build a map facies sediments of the productive formation (Dolecki Century A. Geological interpretation of geophysical research wells. - Moscow, 1966; Grachevsky M. M., Berlin Y. M. and other Correlation raznorazmernyh strata in search of oil and gas. - Moscow, 1969). On the map, the facies define drilling wells. Within floodplain sediments, which are characterized by low permeability and high ruggedness, to increase the enrolment rate net wells sealed. Net wells caught in channel deposits and with rates of 8-12 times exceeding the production rate of wells located in the floodplain, due to the effective development of the reserves condense on the stage lowerbody stocks (see drawing).
Then at the appointed places known methods of drilling of wells, the lower and cement operating columns, perforined them in the productive interval of the formation and produce a hydrocarbon conventional way the efficiency of the hydrocarbon production and ultimate recovery of oil.
The way to develop heterogeneous deposits of hydrocarbons, providing the phases of drilling on the area of deposits and production of hydrocarbons through the production well, wherein for deposits, alluvial deposits, at the stage of drilling on the rare grid according to geophysical and core research building map lithological facies sediments of the reservoir, at the same time within floodplain sediments with low permeability and high ruggedness deposits net wells compacted, and within the fluvial deposits net condense on the stage lowerbody hydrocarbon reserves.
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