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,

24752·2000=49,504 rubles

The savings for the year compared with the known method is:

86,632+30-49,504=67,128 rubles

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.



 

Same patents:

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.

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10 cl, 11 dwg

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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.

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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.

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1 ex, 1 dwg

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2 cl, 1 ex, 1 tbl, 8 dwg

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1 dwg, 1 ex

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1 ex, 1 tbl, 2 dwg

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4 cl, 8 dwg

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1 ex, 1 tbl

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1 ex, 2 dwg

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