Oil field development method
FIELD: oil field development, particularly obtaining oil from a deposit by flooding.
SUBSTANCE: method involves drilling injection and production wells; injecting liquid in wells and extracting product. Wells are drilled along with local valleys and projections investigating. Natural formation water directions are assigned as water flow direction from projections to valleys. Then formation permeability anisotropies created by above flow are determined. Peripheral and line injection wells are located in correspondence with natural formation water flow direction, namely at outer oil-bearing contour from natural formation water flow entering side. Intracontour well rows are additionally arranged substantially transversally to natural formation water flow direction. Production wells are drilled substantially transversally to natural formation water flow direction.
EFFECT: increased oil output due to improved high-permeable formation injectivity and decreased number of injection wells.
1 ex, 2 dwg
The proposed method relates to the field of development of oil fields, operated by flooding.
There is a method of development of an oil field using zakomornogo flooding (Ragimov. "Modern management methods in the development of oil fields with the use of flooding". Publishing house of Kazan University, 2003, p.79-80).
The disadvantage of this method is the low recovery factor multilayer deposits and high water-cut oil production.
The closest in technical essence to the present invention is a method of developing oil fields, including drilling injection and production wells, injection, selection of products. (Ragimov. "Modern management methods in the development of oil fields with the use of flooding". Publishing house of Kazan University, 2003, p.79-80).
The disadvantage of this method is the low recovery factor, and a high water cut production of oil deposits and incomplete coverage of the flooding oil reservoirs, due to the overlapping areas of potential impact wells that says about the irrational placement of injection wells.
The technical objective of the proposed method is to increase oil recovery and increase economic efficiency is by increasing the intake capacity of high-permeability layers and reducing the number of injection wells.
This task is achieved is described by way of the oil field development including drilling injection and production wells, injection, selection of products.
What's new is that the drilling is carried out with study of elevations and depressions, determination of the direction of movement of the natural flow of formation waters as the direction of flow from the upland to the lowland and the definition created by the flow of anisotropy permeability layers, with secondarye and selection injection wells placed in accordance with the direction of the natural flow of formation waters on the outer contour of oil from entering the natural flow of formation waters, additionally place contour rows of injection wells subependymoma the direction of natural flow of produced water, drilling horizontal producing wells subependymoma direction of natural flow of formation waters.
On figa) presents the layout of injection and production wells on the site of the Deposit of the prototype.
On figb) presents the layout of injection and production wells on the site of the Deposit on the proposed method of development of an oil field.
The method is carried out in the following sequence.
The field is asburiae vertical 1, 2 and horizontal wells 3. Grid drilling depends on the size of the Deposit and its geological structure. Drilling vertical wells 1, 2 allows you to update the geological structure of the Deposit and to plan the placement of horizontal wells 3. Explore zakonchennuyu region, determine the presence of hydrodynamic connection Samanthurai area with oil by the interference test. The results determine the kind of impact on oil reservoirs, then Buryats injection wells. During the drilling of injection wells initially studied geological characteristics of this field is determined by where the regional uplift and depression, therefore, is determined by the direction of the natural flow of formation waters (from uplift to subsidence) and created this thread anisotropy permeability reservoirs. Then secondarye and selection injection wells drilled on the outer contour of oil and 5 so that they were placed by the admission of the natural flow of formation waters (figb). Additionally place contour 4 rows of injection wells subependymoma the direction of natural flow of produced water, drilling horizontal producing wells subependymoma direction of natural pococapsule water. Initiate producing horizontal and vertical wells for sampling production and injection wells injection fluid. There is a decrease in reservoir pressure within the Deposit. The fluid injected into the selection area moves in the direction of the deposits of which coincides with the direction of natural groundwater flow, which increases injectivity of injection wells and increase reservoir pressure in the area of product selection. There is an increase in flow rates of producing wells. Due to the efficiency of discharge received an economic benefit due to the reduction of the number of injection wells.
An example of a specific implementation.
At the mine carried out geological studies have identified the location of elevations and depressions and/or built a geological model to determine a direction of natural flow of formation waters and created this thread anisotropy of permeability reservoirs. He razberri the mine design grid vertical extractive 2 and discharge 1 wells and horizontal production wells 3. Lifting is in the North-East, and the deflection in the South-West. Selection and secondarye injection well 1 was drilled from the upland to the deflection of the outer contour 5, (figb) undertook his training is trojstvo. Additionally posted contour 4 rows of injection wells subparafascicular direction of natural flow of formation waters, drilled horizontal producing wells subependymoma direction of natural flow of formation waters. Made the download agent injection 1 and the extraction of oil from production wells 2. Took measurements of oil production and water injection. Built lithological map and has estimated oil reserves, the displacement characteristics identified recoverable reserves. The area is 4800 tonnes of geological and 2400 tonnes of recoverable reserves. Let the injection wells 1 injection, carried out the extraction of extractive 2 vertical and horizontal wells 3.
The initial average rate of producing wells by a known method is qn=5.4 tons/day., the proposed method qn=11 tonnes. The average annual oil production to the application of the method would 1836 t, after applying the proposed method will be 3740 t per well. Consequently, through the use of this method of developing oil fields will be extracted 1904 tons per well, on all site per year will be produced 24752 tons of oil.
The price of additional crude oil in rubles will be (when the oil price 3500 rubles per ton) 86,632 million rubles In this economic you the ode obtained even at the expense of reducing the number of injection wells. With an average cost per one injection well 10 million dollars savings for the entire period will be 30 million rubles
Additional costs for the drilling of horizontal wells will be 24 million rubles, the average annual operating costs for production of additional crude oil will be, when the production costs of oil production 2 thousand rubles per ton,
The savings for the year compared with the known method is:
Average annual economic effect will be 67,128 million rubles, 1 well - 4,1955 rubles
The way of the oil field development, including the drilling of injection and production wells, injection, selection of products, characterized in that the drilling is carried out with study of elevations and depressions, determination of the direction of movement of the natural flow of formation waters as the direction of flow from the upland to the lowland and the definition created by the flow of anisotropy permeability layers, with secondarye and selection injection wells placed in accordance with the direction of the natural flow of formation waters on the outer contour of oil from entering the natural flow of formation waters, additionally place contour rows of injection wells to superinduce the Jarno direction of natural flow of formation waters, Buryats horizontal producing wells subependymoma direction of natural flow of formation waters.
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: mining industry.
SUBSTANCE: draining systems, drilled in horizontal well along bed deposit, connected to system of vertical wells drilled from surface, provide access to broad underground area, while vertical well or wells allow effective removal and/or extraction of water, hydrocarbons and other mineral resources.
EFFECT: higher efficiency and productiveness.
10 cl, 11 dwg
FIELD: oil production industry, particularly for oil field development.
SUBSTANCE: method involves drilling inclined main transport hole through formation towards water-oil contact level; drilling ascending additional branch holes; ascending branch hole bottom marks are drilled so that bottom marks thereof descend to main transport hole end. Bottom mark of the last ascending additional branch hole is set taking into consideration distance ratio defined by distance between vertical distance from lower point of main transport horizontal hole, which is head mark of the last ascending branch hole, to water-oil contact level and distance from bottom of the last ascending additional branch hole to water-oil contact level. Above distance ratio is to be equal to 0.3-0.5. Bottom mark of the first ascending additional branch hole is set from distance ratio defined by vertical distance from head of the first ascending additional branch hole to water-oil contact level and distance between bottom of the first ascending additional branch hole to water-oil contact level, wherein above distance ratio is to be equal to 0.6-0.8. Bottom marks of intermediate ascending additional branch holes arranged between the first and the last ones are set from distance ratio defined by vertical distance from head of corresponding ascending additional branch hole to water-oil contact level and distance from bottom of the same ascending additional branch hole to water-oil contact level, wherein the distance ratio is to be equal to 0.3-0.8. The main transport horizontal hole is provided with flow string arranged so that flow string bottom is located in lower point of main transport horizontal hole. Oil is produced through ascending additional branch holes.
EFFECT: increased oil recovery from the field.
1 ex, 1 dwg
FIELD: oil production industry, particularly to maintain formation pressure.
SUBSTANCE: system comprises injection well, drive and pump. Drive and pump are arranged out of the well and may cooperate with each other. Inlet pump part is connected with low pressure pipeline. Pump outlet is connected with injection well by high pressure pipeline. The drive is pumping unit with suspension bracket installed on frame. The pump is of piston type fixedly connected with pumping unit frame and arranged in horizontal or inclined plane. The pump has piston with polished rod. The system additionally has guiding unit with flexible ties provided with at least two grooves. One groove is adapted for one flexible tie winding/unwinding, another one is used for another flexible tie winding/unwinding. The flexible ties are separated and extend at an angle one to another. The first end of each flexible tie is fixed in guiding block, the second one is secured to suspension bracket of pumping unit and to polished rod.
EFFECT: increased operational efficiency of injection wells in the case of poorly-permeable reservoirs, low injection volumes due to provision of injection regime regulation without pumping equipment replacement, reduced pumping equipment wear and increased operational reliability.
21 cl, 4 dwg
FIELD: oil field development, particularly to develop fields having carbonate reservoirs with karstic phenomena.
SUBSTANCE: method involves drilling production and injection vertical and horizontal wells; injecting water through injection wells; extracting product through production wells; determining areas characterized by maximal hypsometric mark fall; drilling additional horizontal and/or branched horizontal wells so that horizontal and/or branched horizontal wells are substantially parallel to contour lines of paleostructure surface; periodically changing well bore direction to search macrocrack, megacrack or karst zones; selecting production well having the highest output in well row spaced equal distances from injection well rows and using thereof as injection well.
EFFECT: increased well output, ultimate oil recovery and increased oil stock coverage with working space due to macrocrack, megacrack and karst zones usage for oil accumulation.
1 ex, 1 dwg
FIELD: oil industry, particularly to control oil field development at late stage along with geological and engineering operations performing in wells, for instance influx intensification (for well stimulation) and wall isolation operations.
SUBSTANCE: method involves injecting displacing agent into injection wells and producing oil through production wells; controlling production well operation by determination of parameters, which characterize current field development state; plotting isobar maps, water-flooded volume maps and seepage direction maps; determining areas from which water and oil flows into particular well; determining reservoir pressure in areas, from which oil P2 and water P1 flows and comparing above pressures. If pressure in area from which water P1 flows in well exceeds pressure in area from which oil P2 flows or if pressures in above areas are equal one to another well bottom zone is treated to recover or increase oil recovery from the well and above well is operated under pressure difference of not less than initial one. If pressure in area from which water P1 flows is less than that in area from which oil P2 flows water insulation work is performed and above well is operated under pressure difference of not more than initial one.
EFFECT: increased efficiency due to reduced associated water extraction along with retaining oil recovery from reservoir, which results in reduced costs of oil production, transportation and oil preconditioning and decreased water content in oil product.
2 cl, 1 ex, 1 tbl, 8 dwg
FIELD: oil and gas industry, particularly oil or gas field development.
SUBSTANCE: method involves forming injection wells uniformly distributed over the full oil or gas field area above productive oil or gas reservoir roof; injecting water via above injection wells into water intake reservoir located over productive reservoir roof; applying additional weight load to productive oil or gas reservoir roof. Oil or gas reservoir pressure is determined from analytic dependence.
EFFECT: prevention of productive oil or gas reservoir flooding and possibility to maintain reservoir oil or gas properties during oil and gas field development.
FIELD: oil production, particularly to flood formations and to keep formation pressure during oil field development.
SUBSTANCE: water conduit is provided with check valve at head zone of injection well having low intake capacity. The check valve directs water flow from water conduit to the well having low intake capacity. The check valve is surrounded with bypass in which filter and check valve are inserted. The bypass check valve directs flow from the well having low intake capacity to the filter. Bypass part between the check valve and the filter has contaminant removal pipeline.
EFFECT: reduced losses of intake well capacity, increased time between injection well bottom zone cleaning operations and, as a result, reduced costs of formation pressure keeping.
1 dwg, 1 ex
FIELD: oil production, particularly oil reservoir stimulation.
SUBSTANCE: method involves previously determining dynamic viscosity of oil-and-gas mixture under in-situ conditions; simultaneously injecting water and gas in oil reservoir via separate pipelines; mixing water and gas by ejecting thereof inside well bore at a certain depth; displacing oil towards production wells by water-and-gas mixture having dynamic viscosity equal to that of oil-and-gas mixture under in-situ conditions. Water-and-gas mixture is prepared so that mixture proportion provides dynamic viscosity equal to that of oil-and-gas mixture under in-situ conditions. Water is cleaned of mechanical impurities and exposed to magnetic field with 320-400 kA/m strength before water being injected into the well.
EFFECT: increased efficiency of oil displacement from reservoir to productive well by water-and-gas mixture due to increased reservoir coverage and reduced bottomhole formation zone clogging.
1 ex, 1 tbl, 2 dwg
FIELD: oil industry, particularly enhanced recovery methods for obtaining hydrocarbons.
SUBSTANCE: method involves cyclically extracting oil from the reservoir zones through productive wells and injecting working agent into reservoir zones through injection wells. Discharge water and oil-field water of low mineralization having thickness of 1-1.005 kg/m3 is used as the working agent. Discharge water is cyclically injected in upper reservoir zones. Oil-field water of low mineralization is cyclically injected in lower reservoir zone for 7-9 months and discharge water is also cyclically injected in lower reservoir zone for 3-5 months.
EFFECT: increased output.
FIELD: oil industry, particularly development of oil reservoir penetrated by horizontal wells.
SUBSTANCE: method involves drilling wells; injecting working agent through a number of injection wells and recovering oil through a number of production wells arranged in parallel to injection ones, in dependence of oil viscosity. In above method vertical or horizontal wells are bored. If oil mobility index M≥2.5 vertical injection and horizontal production wells are bored. If oil mobility index is 0,4<M<2.5 horizontal wells are drilled. If oil mobility index M≤0.4 horizontal injection and vertical production wells are bored.
EFFECT: increase efficiency.
4 cl, 8 dwg
FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons.
SUBSTANCE: method involves injecting working agent through injection wells; producing oil through production wells; converting production well into injection well. To realize above method at least one well is selected in well row, wherein the selected well is spaced equal distances from injection well rows and has the least output in comparison with another production wells of present oil bed area. The selected well is converted into injection one. Before above conversion bottom zone of the well is cleaned and above oil bed area is subjected to vibratory action simultaneously with working agent injection through this additional injection well. Summary oil recovery increase is accepted to be equal to working agent volume injected in additional injection well.
EFFECT: increased oil recovery efficiency during oil production from non-uniform bed.
1 ex, 1 tbl
FIELD: oil field development, particularly to obtain oil from a multiple-zone well.
SUBSTANCE: method involves drilling vertical and horizontal wells, injecting displacing agent and recovering product. Production horizontal and vertical wells and/or branched horizontal wells are drilled in zones having lesser average number of permeable intervals and greater reservoir part values and in formation junction zones of field to be developed. Injection wells present in above zone are used for oil production. Some production wells arranged along above zone border are used as injection ones along with previous highly-viscous liquid plug injection into high-porous formations to direct main liquid flow, namely oil and displacing agent, to horizontal wells.
EFFECT: increased oil recovery due to enlarged effective well bore length and due to increased inflow of oil displaceable from zones characterized by increased average number of permeable intervals to zones with high reservoir part values.
1 ex, 2 dwg