Oil deposit extraction method (variants)

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

 

The proposal relates to the oil industry, to the development of oil fields, dedicated to the domed uplift, and can be used both in the initial stage of development, and in the final stage of the field's operation.

There is a method of developing oil fields [EN, a.c. 1606686, IPC E 21 In 43/20, 1988], which includes the drilling grid of injection and production wells, water injection through injection wells, oil production through production wells, drilling of additional wells, reducing the number of additional drill wells saving project recovery, step by step short stop part of active wells with regard to the layer and zonal heterogeneity, while working for a group of wells defining recovery for the final stage of development, the choice of the various groups of wells maximum oil recovery (η) for project recovery, and on the basis of the maximum required recovery definition grid wells from the following dependencies:

where S is the density of the grid wells;

A is the coefficient characterizing the displacement of oil from the covered drainage volume of the field;

In - coefficient characterizing not covered by the displacement volume IU the prospect at different well spacing.

The advantage of this method is the possibility of optimizing the grid wells.

The disadvantage of this method is the low oil recovery due to non-development pillar of oil in the areas of peaks of the dome-shaped elevations.

The closest in technical essence to the present invention is a method of developing oil fields [RU, patent 2065040, IPC E 21 In 43/30, 1996], including drilling injection and production wells, injection working agent through the injection wells, oil production through production wells, the allocation of plots dome-shaped elevations in excess of the absolute level of the reservoir, placing on these areas of additional wells.

The method allows to increase the volume of extracted oil in anhydrous period of operation of the reservoir, separated from the water-saturated parts of the field impermeable screens.

The disadvantage of this method is the low oil recovery due to the inability of involvement in the development of oil reserves stagnant zones at the vertices of a dome-shaped elevations in the absence of screens, separates from the water-saturated part.

The technical objective of the proposed method is to increase oil recovery through effective involvement in the development of the oil field areas with difficult-to-recover oil reserves of stagnant zones, located at the vertices of cupola is different elevations, control field.

The task proposed method solves in two versions.

In the first embodiment, the method includes drilling injection and production wells, injection working agent through the injection wells, oil production through production wells, the allocation of plots dome-shaped elevations in excess of the absolute level of the reservoir, placing on these areas of additional wells.

According to the proposed solution designing the placement of wells on the tops of the dome-shaped elevations and even violation of the uniformity of the design grid wells, and after complete drilling of the well grid and in the case of a refiner according to drilled wells the location of the peaks of the dome-shaped elevations of the Buryats from the nearby wells laterals in the direction specified vertices dome-shaped elevations, control field, and in nearby wells and lateral trunks, placed on the tops of the dome-shaped elevations reveal the productive interval of the formation between the absolute elevation of the roof in this well and the absolute mark corresponding to the roof in the nearest hole.

According to the second variant, the method includes drilling injection and production wells, injection working agent through the injection wells, oil production through production wells, ejecta the plots dome-shaped elevations, exceeding the absolute level of the reservoir, placing on these areas of additional wells.

According to the proposed solution designing the placement of wells on the tops of the dome-shaped elevations and even violation of the uniformity of the design grid wells, and after complete drilling of the well grid and in the case of a refiner according to drilled wells the location of the peaks of the dome-shaped elevations of the Buryats from the nearby wells laterals in the direction specified vertices dome-shaped elevations, control field, and in nearby wells and lateral trunks, placed on the tops of the dome-shaped elevations, when the absolute level of the roof of the productive formation in nearby wells below the soles of the productive formation in the lateral trunks, open to the entire layer.

Suggested way to develop oil fields differ from the prototype sequence of technological operations and the availability of new features. The merger of the two variants of the method in one application because they solve one problem - the oil recovery enhancement through effective involvement in the development of the oil field areas with difficult-to-recover oil reserves of stagnant zones, located at the vertices of a dome-shaped elevations, control field.

In patent the th and scientific-technical literature is not known to the claimed variants of sets of distinctive features, therefore, the claimed method meets the criterion of "inventive step".

The essence of the mechanism of oil recovery increase is as follows.

Figure 1 shows the reservoir section with wells in the implementation of the proposed method of development of an oil field in the case when the location of the top of a dome-shaped uplift refined in the process of drilling the design of the grid wells.

Figure 2 presents the reservoir section with wells and sidetracks in the case of a refiner according to drilled wells the location of the peaks of the dome-shaped elevations after drilling.

The proposed method oilfield development take into account the factor of gravitational forces: due to the difference in specific gravities of the injected water and oil is not replaced the oil in the tops of the dome-shaped elevations controlling the field. More control and refinement plots dome-shaped elevations, drilling holes in the tops of the dome-shaped elevations or sidetracks, the regulation of the process of opening oil reservoirs with stagnant oil, allows to extract these reserves, which increases the oil recovery. The proposed method is carried out in the following sequence.

Design placement grid wells in the field with a required location at which arsineh dome-shaped elevations, controlling the field. Begin drilling field in the design grid (well 1, 3, figure 1). Put the well into production, enter the field in the development. When drilling constantly clarify the geological structure of the Deposit receiving information after drilling each well. Specify the location of the peaks of the dome-shaped elevations, shifting project well at the top of the dome-shaped elevations (figure 1, well # 2), even if it leads to disruption of the uniformity of the grid. Razvarivat field completely and in the case of a clarification of the location of the peaks of the dome-shaped elevations of the Buryats from the nearby wells, sidetracks with placing their faces on these peaks (figure 2, shafts 8 and 9). Open the productive interval of the formation between the absolute elevation of the roof in this well and the absolute mark corresponding to the roof in the nearest hole. Let these wells with two faces into operation and continue the development of the field. When this oil is concentrated in the dome of the zones 4, 10, 11, is produced by drilling the proposed wells and additional trunks.

On the second version of the oilfield development project placement grid wells in the field with a required location on the tops of the dome-shaped elevations controlling mastora the employer. Begin drilling field in the design grid (well 1, 3, figure 1). Put the well into production, enter the field in the development. When drilling constantly clarify the geological structure of the Deposit receiving information after drilling each well. Specify the location of the peaks of the dome-shaped elevations, shifting project well at the top of the dome-shaped elevations (figure 1 well # 2), even if it leads to disruption of the uniformity of the grid. Razvarivat field completely and in the case of a refiner according to drilled wells the location of the peaks of the dome-shaped elevations of the Buryats from the nearby wells, sidetracks with placing their faces on these peaks (figure 2, shafts 8 and 9). When the absolute level of the roof of the productive formation in nearby wells below the soles of the productive formation in the lateral trunks, open to the entire reservoir. Let these wells with two faces into operation and continue the development of the field. When this oil is concentrated in the dome of the zones 4, 10, 11, is produced by drilling the proposed wells and additional trunks.

Options offer involvement in the development of reserves of stagnant zones, which were formed as a result of gravitational forces due to the presence of differences in specific gravities of the displacing water (water is, injected or sukantara brine) and extracted oil. The oil located in the stagnant zone in prikrovatnoj part of the reservoir due to the action of gravitational forces to the application of the method comes in wells, and more guns wells. The opening of the productive interval of the formation between the absolute elevation of the roof in the borehole and the absolute mark corresponding to the roof in the nearest hole, or opening the entire reservoir, when the absolute level of the roof of the productive formation in nearby wells below the soles of the productive formation in the lateral trunks, allows to produce first oil stagnant zones, concentrated in prikrovatnoj of the reservoir in the area of the peaks of the dome-shaped elevations. This leads to an increase of the coverage of the formation development, to increase oil recovery. An example of a specific implementation.

The example in the first embodiment. The implementation of this method, consider the example of site-specific oil field. Started to drill the area of the Deposit. Drilled wells 5, 7 (figure 2). Let wells 5, 7 in operation. Said geological structure. The project wells are placed at the vertices of a dome-shaped elevations (6), constructed according to the drilling of wells 5 and 7. Put the well into production. Sukantara the water began to displace the oil. Formed on the E. stagnant zones 10 and 11 due to gravitational forces. Additional data on this test showed that there were two peaks of the dome-shaped elevations. With the nearest wells 5 and 6 were drilled laterals 8 and 9 with the opening of the domed tops of the elevations 10 and 11 in the productive interval of the formation between the absolute elevation of the roof (point a and C) in the lateral trunks to the absolute level of the roof of the reservoir in nearby wells (point B), respectively, for lateral shafts 8 and 9. Let wells 5 and 6 with sidetracks into operation. From wells 5 and 6 through the side trunks began to extract oil from stagnant zones. Estimated in-place and recoverable oil reserves plot 500 and 215 tons, respectively, and stagnant zones introduced in the development of the proposed method, 70 and 35 thousand tons

Field tests showed that the rate of sidetracks amounted to 7 tonnes. Annual production of these trunks was 4.76 tons of oil, which resulted in increased oil recovery factor by 1% for 1 year. For the whole period of development of the oil recovery will increase from 0.43 to 0.50, i.e. by 7%.

Capital expenditures for drilling sidetracks amounted to 5 million rubles Worth of additional oil was (when the oil price is 2500 rubles/t) 79,15 million rubles (over 10 years). Average annual economic effect amounted 7,915 million rubles per well. The payback period for the cost of sidetracking was (including taxes) 1 year. For in the time of wells with lateral trunk was a profit in the amount of 42.0 million RUB

An example for the second option. The implementation of this method, consider the example of site-specific oil field. Started to drill the area of the Deposit. Drilled well and put into operation. Said geological structure. The project wells are placed at the vertices of a dome-shaped elevations and even violation of the uniformity of the design grid wells. Drilled and put into operation well. Sukantara the water began to displace the oil. Formed two dead zones due to gravitational forces. After you complete the drilling of the well grid was specified according to drilled wells the location of the peaks of the dome-shaped elevations. With the nearest wells drilled laterals in the direction specified vertices dome-shaped elevations controlling the field. In nearby wells and lateral trunks, placed on the tops of the dome-shaped elevations, the absolute elevation of the roof of the productive formation in nearby wells below the soles of the productive formation in the lateral trunks, so opened up the entire reservoir. Let wells with sidetracks into operation. Estimated in-place and recoverable oil reserves plot 500 and 215 thousand tons respectively and stagnant zones introduced in the development of the proposed method, 90 and 45 thousand tons

Annual production of these trunks was 6,this. tons of oil, which led to the increase of the recovery factor 1.29% for 1 year.

Capital expenditures for drilling sidetracks amounted to 5 million rubles Worth of additional oil was (when the oil price is 2500 rubles/t) 101,76 million rubles (over 10 years). Average annual economic effect amounted 10,176 million rubles per well. The payback period for the cost of sidetracking was (including taxes) for 9 months. During the operation of wells with lateral trunks was a profit in the amount of 54.0 million rubles

Suggested way to develop oil fields allow you to increase oil recovery by extraction of additional oil from stagnant zones at the vertices of a dome-shaped elevations controlling the field, thanks to the improvement of the system design taking into account gravitational forces.

1. The way of the oil field development, including the drilling of injection and production wells, injection working agent through the injection wells, oil production through production wells, the allocation of plots dome-shaped elevations in excess of the absolute level of the reservoir, placing on these sites more wells, wherein designing the placement of wells on the tops of the dome-shaped elevations and even violation of the uniformity of the design grid wells, and the last is full of drilling the well grid and in the case of a refiner according to drilled wells the location of the peaks of the dome-shaped elevations of the Buryats from the nearby wells laterals in the direction specified domed tops elevations controlling the field, and in nearby wells and lateral trunks, placed on the tops of the dome-shaped elevations reveal the productive interval of the formation between the absolute elevation of the roof in this well and the absolute mark corresponding to the roof in the nearest hole.

2. The way of the oil field development, including the drilling of injection and production wells, injection working agent through the injection wells, oil production through production wells, the allocation of plots dome-shaped elevations in excess of the absolute level of the reservoir, placing on these sites more wells, wherein designing the placement of wells on the tops of the dome-shaped elevations and even violation of the uniformity of the design grid wells, and after complete drilling of the well grid and in the case of a refiner according to drilled wells the location of the peaks of the dome-shaped elevations of the Buryats from the nearby wells laterals in the direction specified vertices dome-shaped elevations, control field, and in nearby wells and lateral trunks, placed on the tops of the dome-shaped elevations, when the absolute level of the roof of the productive formation in nearby wells below the soles of the productive formation in the lateral trunks, open to the entire layer.



 

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