Nonuniform oil field development method

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

 

The proposed method relates to the field of oil field development, presents a heterogeneous reservoirs.

There is a method of developing oil fields with heterogeneous reservoirs by drilling project the number of injection and production wells, flooding and extraction of oil on the surface, followed by the drilling of some small number of producing wells, taking into account the heterogeneity of the reservoir (Migemo. "Geological framework of the development of oil fields". M.: Nedra, 1975).

The disadvantage of this method is the low oil recovery associated with incomplete sweep efficiency due to the ignorance of the heterogeneity of the reservoir and saturating fluids at the initial design stage.

The closest in technical essence to the present invention is a method of developing a heterogeneous oil fields, including drilling injection and production of vertical and horizontal wells, the flooding of the reservoir and removing the oil on the surface, the refinement of the geological structure of the drilling and modeling and drilling additional wells with lateral or horizontal wells from old wells (see RF patent №2101475, IPC E 21 In 43/20, BI No. 1, 1998).

The disadvantage of this method is the incomplete coverage of the layers of the plant is the group because of the impossibility of extraction of oil, located along the borders of zones of substitution collectors.

The technical objective of the proposed method is to increase oil recovery by engaging in the development of stagnant zones of oil along the borders of zones of substitution collectors.

This task is achieved by the described method of mining heterogeneous oil fields, including drilling injection and production wells, the flooding of the reservoir and removing the oil on the surface, the refinement of the geological structure of the drilling and modeling and drilling additional wells with lateral or horizontal wells from old wells.

It is new that determine the location of boundaries of zones substitution collectors, additionally calculate the quantity of fixed oil, concentrated near the borders of zones of substitution collectors, then carry out the drilling of horizontal wells with old wells located near the borders of zones of replacement of sewers and/or new wells with a horizontal shaft in this area, and horizontal trunks Buryats in the direction perpendicular to the boundary of substitution.

Known scientific-technical and patent sources is not known use of the proposed essential features that perform a similar task.

The drawing presents the Jena layout on the site of the Deposit project wells and horizontal wells from old wells (b), uncovered residual zone of oil in the oil reservoir, located along the border zones of substitution.

The inventive method is carried out in the following sequence.

Field razvarivat project wells, carry out its infrastructure. Have pumped water injection and oil production from producing wells. During operation measure oil and water. Clarify the geological structure and oil using the parameters of the layers after the resulting drilling project wells. Clarify the boundaries of the zones substitution collectors. After reaching a period of declining production determine the recoverable reserves using the displacement characteristics. Comparing reserves, estimated using the volumetric method and displacement parameters determine the presence and quantity of fixed oil, concentrated near areas replacement of headers.

The additional drilling of horizontal wells and/or horizontal wells in the direction of the zones substitution allows us to Refine the boundaries of these zones, therefore, the oil reserves near them. Enter these horizontal wells can be entered into the development of additional oil reserves, located near the zones of substitution.

Place new wells with lateral and/or horizontal trunks with old SK is Agin, located near the borders of zones of substitution collectors so that horizontal wellbore in a productive part was drilled in a direction perpendicular to the boundary of substitution collectors. In the process, due to the formation of additional pressure gradient in the stagnant zones there is a movement previously fixed oil to these wells. This leads to increased oil recovery.

Specific example

The mine has rasberry design grid (figa 1, 2), made his arrangement. Produced water injection into 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 reserves of oil, determined by the displacement characteristics of recoverable reserves. At site - 2145 gg geological and 1072 tons of recoverable reserves. In this area significant areas (about 30%) was not a collector. Produced 600 tons of oil. Production watercut reached 50%. Conducted a simulation plot using mathematical models of two-phase filtration in a two-dimensional region. Identified areas of lowest pressure gradients. Determined the location of the boundaries of zones substitution collectors. Determined that stagnant zones are formed along the border zone of substitution collectorof. Wells located in the immediate vicinity of the zones substitution collectors drilled horizontal trunks 3, directed perpendicular to the boundary zones substitution collectors (figb). Put them in production. Identified recoverable reserves using the displacement characteristics. Recoverable reserves increased by 20% and amounted to 3200 tons, against 2604 tons, specific to horizontal drilling. Additional production will be 525 gg economic value of this additional crude oil will be (when the price of oil is $ 3500 per tone) 1,8375 billion rubles (over 30 years). Additional costs for sidetracking 4 will be 24 million rubles, the operating costs of the extraction of additional crude oil will be, when the production costs of oil production 2 thousand rubles per ton:

525000·2000=1050 million rubles

Savings for the entire period of work will be

1837,5-1050=787,5 million rubles

Average annual economic effect will be 26,25 million rubles, 1 well - 6.56 mln rubles

The way to develop heterogeneous oil fields, including drilling injection and production wells, the flooding of the reservoir and removing the oil on the surface, the refinement of the geological structure of the drilling and modeling and drilling additional wells with lateral or horizontal with the oxen from old wells, characterized in that to determine the location of boundaries of zones substitution collectors, additionally calculate the quantity of fixed oil, concentrated near areas of replacement collectors, then carry out the drilling of horizontal wells from old wells located near the borders of zones of replacement of sewers and/or new wells with a horizontal shaft in this area, and horizontal trunks Buryats in the direction perpendicular to the boundary of substitution.



 

Same patents:

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EFFECT: possibility to retain oil relative permeability of oil-saturated formation area.

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2 cl, 2 dwg

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

1 ex

FIELD: oil and gas extractive industry.

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1 dwg

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1 ex

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EFFECT: improved oil recovery.

2 dwg, 1 ex

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1 ex, 1 dwg

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