CN106996288B - Triangular oil reservoir injection-production well pattern arrangement - Google Patents
Triangular oil reservoir injection-production well pattern arrangement Download PDFInfo
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- CN106996288B CN106996288B CN201710428709.5A CN201710428709A CN106996288B CN 106996288 B CN106996288 B CN 106996288B CN 201710428709 A CN201710428709 A CN 201710428709A CN 106996288 B CN106996288 B CN 106996288B
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- well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Abstract
The invention discloses a triangular oil reservoir injection-production well pattern arrangement, which comprises water injection wells and production wells, wherein the water injection wells are arranged at each vertex, each side midpoint and the gravity center of a triangle, and the production wells are arranged on a connecting line of the gravity center and each vertex and a connecting line of the gravity center and each side midpoint. The invention aims to provide triangular oil reservoir injection-production well pattern arrangement, which solves the problem that the injection-production well pattern arrangement of a triangular oil reservoir easily causes low exploitation efficiency in the prior art, and achieves the purposes of improving the triangular oil reservoir recovery ratio and reducing the water content of produced liquid.
Description
Technical Field
The invention relates to the field of well patterns of oil and gas fields, in particular to triangular oil reservoir injection-production well pattern arrangement.
Background
The well pattern refers to the distribution mode of oil, gas and water injection wells in the development process of oil and gas fields, is an important link in the development scheme of oil and gas reservoirs, and relates to the development efficiency, the ultimate recovery rate and the economic benefit of oil field development. In the prior art, for the arrangement mode of the oil reservoir well pattern, firstly, the required production well number is obtained by dividing the total geological reserve of the oil reservoir by the single well control reserve obtained by the conventional well test, and then, based on the required production well number, one row of production wells corresponds to one row of water injection wells, so that a latticed well pattern arrangement structure with evenly distributed injection and production wells is designed. The arrangement mode has better recovery efficiency for oil reservoirs with regular structures, particularly oil reservoirs with approximate square and round shapes. However, for an irregular triangular oil reservoir, due to the special shape of the trap structure of the triangular oil reservoir, the conventional grid-type well pattern arrangement is adopted, so that the problems of low recovery rate, quick water breakthrough of an oil well, and even incapability of continuing water injection and water flooding at the middle stage of oil field exploitation are easily caused, and the exploitation efficiency is seriously influenced.
Disclosure of Invention
The invention aims to provide triangular oil reservoir injection-production well pattern arrangement, which solves the problem that the injection-production well pattern arrangement of a triangular oil reservoir easily causes low exploitation efficiency in the prior art, and achieves the purposes of improving the triangular oil reservoir recovery ratio and reducing the water content of produced liquid.
The invention is realized by the following technical scheme:
the triangular oil reservoir injection and production well pattern arrangement comprises water injection wells and production wells, wherein the water injection wells are arranged at vertexes, middle points of sides and gravity centers of a triangle, and the production wells are arranged on connecting lines of the gravity centers and the vertexes and connecting lines of the gravity centers and the middle points of the sides.
Aiming at the problem that the injection-production well pattern arrangement of a triangular oil reservoir easily causes low exploitation efficiency in the prior art, the invention provides the injection-production well pattern arrangement of the triangular oil reservoir, wherein water injection wells are arranged at each vertex, each side midpoint and a gravity center of the triangle of the triangular oil reservoir, and the gravity center of the triangle is known to be the intersection point of three central lines. The top points are turning points of the oil reservoir, so that the water injection wells are arranged at the top points to ensure that oil and gas in the oil reservoir are driven to the center; the water injection wells are arranged at the middle points of the edges, so that the barrier effect of the edges of the oil reservoir is enhanced, the oil gas is prevented from being scattered and overflowed from the edges, and the oil gas is driven to the central position from the edges; the water injection well is arranged at the center of gravity position, so that the middle part of the oil deposit can provide a driving force for scattering and overflowing all around, and oil and gas are driven to the production wells distributed in the oil deposit. The production well is arranged on a connecting line of the gravity center and each vertex and a connecting line of the gravity center and the midpoint of each side. The production wells are distributed in a diverging manner outwards by taking the gravity center as a center point, the diverging directions are carried out along the connecting line of the gravity center and each vertex and the connecting line of the gravity center and each side midpoint, six diverging directions are provided, and the production wells are arranged along a straight line according to the length of each section of distance in the six diverging directions. The arrangement mode enables narrow zones and production wells in the triangle to be fewer; the large-area and large-quantity production wells can make the single well obtain larger effective control reserves, and the problem that the traditional grid well pattern arrangement mode causes large and small control reserves of the single well in the triangular oil reservoir is solved, so that the overall recovery ratio of the triangular oil reservoir is greatly improved. Meanwhile, the water injection wells are only arranged at the gravity center in the oil reservoir, and the rest of the water injection wells are all located at the edge positions, so that the problem that the water content is higher than that of a conventional square or round oil reservoir in the existing narrow triangular oil reservoir exploitation process can be solved, the water breakthrough time of an oil well is prolonged, and the water content is reduced.
Furthermore, a plurality of auxiliary water injection wells are arranged between the top points and the middle points of the triangle at equal intervals. The oil reservoir edge plugging device is used for plugging the oil reservoir edge more thoroughly, avoids oil and gas from overflowing out of the trap, provides stronger driving, and further improves the recovery ratio of the production well in the oil reservoir.
Preferably, the production well on the connecting line of the gravity center of the triangle and each vertex is a vertical well, and the production well on the connecting line of the gravity center of the triangle and the midpoint of each side is an extended reach well or a horizontal well. The production well on the connecting line of the gravity center of the triangle and the middle point of each side is an extended reach well or a horizontal well, and the characteristics of high control and high yield of the extended reach well or the horizontal well are utilized to improve the single well control reserve, so that the overall recovery ratio of the oil field is improved. Meanwhile, the production wells on the connecting lines of the gravity center and each vertex are arranged to be vertical wells, and the problem that the whole cost is too high due to the fact that extended reach wells or horizontal wells are adopted in the oil reservoir is solved. The mode that adopts vertical well and large displacement well or horizontal well to arrange in turn sets up the production well, can also ensure that the oil reservoir has three-dimensional mobile form, avoids oil gas to form the problem that flows between the simple layer and lead to the harvesting position too little.
Preferably, the water injection amount of the auxiliary water injection well is less than or equal to 1/2 of the water injection well. The main function of the auxiliary water injection well lies in blocking oil gas from overflowing from the edge of the oil deposit, so that the water injection amount of the auxiliary water injection well is smaller than that of a conventional water injection well, and the phenomenon that the water content is abnormally increased in advance due to the fact that excessive water is injected into the oil deposit is avoided.
Preferably, the projection of a connecting line between the well mouth and the well bottom of the extended reach well or the horizontal well on the horizontal plane is perpendicular to a connecting line between the gravity center of the triangle and the midpoint of each side. The single-well control area of the extended reach well or the horizontal well is increased, so that the azimuth angle of the extended reach well or the horizontal well is further diverged in the oil reservoir, and the recovery ratio is increased.
Furthermore, the connection line of the gravity center of the triangle and each auxiliary water injection well is reserved with an adjusting well position. After the oil and gas field is put into development for several years, in order to improve the reserve utilization degree and improve the recovery efficiency, the well which needs to be drilled in an encrypted manner is called as an adjusting well. The traditional well position of the adjusting well is directly encrypted at the later stage of exploitation, and is not reserved, so that the problems that the underground collision prevention risk is large, the well position is inconvenient to arrange, the field construction is difficult to meet and the like are easily caused at the later stage. The well position of the adjusting well is reserved on the connecting line of the triangular gravity center and each auxiliary water injection well, other well positions are not arranged on the connecting line, enough drilling and production space can be provided for the later stage no matter the water injection adjusting well or the development adjusting well, the underground anti-collision risk can be avoided, and the problem of difficulty in later-stage exploitation of the oil field is solved to a great extent.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the triangular oil reservoir injection-production well pattern arrangement, the water injection wells are arranged at the vertexes and used for displacing oil towards the interior of the trap, and the vertexes are turning points of the oil reservoir, so that the water injection wells are arranged at the vertexes and ensure that oil and gas in the oil reservoir are driven towards the center; the water injection wells are arranged at the middle points of the edges, so that the barrier effect of the edges of the oil reservoir is enhanced, the oil gas is prevented from being scattered and overflowed from the edges, and the oil gas is driven to the central position from the edges; the water injection well is arranged at the center of gravity position, so that the middle part of the oil deposit can provide a driving force for scattering and overflowing all around, and oil and gas are driven to the production wells distributed in the oil deposit.
2. According to the triangular oil reservoir injection-production well pattern arrangement, the number of narrower zones and production wells in the triangle is small through the arrangement structure of the production wells; the large-area and large-quantity production wells can make the single well obtain larger effective control reserves, and the problem that the traditional grid well pattern arrangement mode causes large and small control reserves of the single well in the triangular oil reservoir is solved, so that the overall recovery ratio of the triangular oil reservoir is greatly improved.
3. The triangular oil reservoir injection-production well pattern arrangement can solve the problem that the water content is higher than that of a conventional square or round oil reservoir in the existing narrow triangular oil reservoir exploitation process, delay the water breakthrough time of an oil well and reduce the water content.
4. According to the triangular oil reservoir injection and production well pattern arrangement, well positions of the adjusting wells are reserved on the connecting line of the gravity center of the triangle and each auxiliary water injection well, other well positions are not arranged on the connecting line, enough drilling and production space can be provided for the later stage no matter the water injection adjusting wells or the development adjusting wells, the underground collision prevention risk is avoided, and the problem that the later stage exploitation of the oil field is difficult is solved to a great extent.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
1-water injection well, 2-production well, 3-auxiliary water injection well and 4-well position adjustment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
the triangular reservoir injection-production well pattern arrangement shown in fig. 1 shows that the triangle represents a production well 2, the square represents an adjustment well position 4, the larger circle represents an injection well 1, the smaller circle represents an auxiliary injection well 3, the dotted auxiliary line for facilitating observation represents a long and narrow triangular reservoir. The water injection well comprises a water injection well 1 and a production well 2, wherein the water injection well 1 is arranged at each vertex, each side midpoint and the gravity center of a triangle, and the production well 2 is arranged on a connecting line of the gravity center and each vertex and a connecting line of the gravity center and each side midpoint. A plurality of auxiliary water injection wells 3 are arranged between the top points and the middle points of the triangle at equal intervals. The production well on the connecting line of the gravity center of the triangle and each vertex is a vertical well, and the production well on the connecting line of the gravity center of the triangle and each midpoint of the side is an extended reach well or a horizontal well. The water injection quantity of the auxiliary water injection well 3 is less than or equal to 1/2 of the water injection well 1. And the projection of a connecting line between the well mouth and the well bottom of the extended reach well or the horizontal well on the horizontal plane is vertical to a connecting line between the gravity center of the triangle and the midpoint of each side. And the connection line of the gravity center of the triangle and each auxiliary water injection well is reserved with an adjusting well position 4. The water injection wells are arranged at the top points for displacing oil towards the interior of the trap, and the top points are turning points of the oil reservoir, so that the water injection wells are arranged at the top points to ensure that oil and gas in the oil reservoir are driven towards the center; the water injection wells are arranged at the middle points of the edges, so that the barrier effect of the edges of the oil reservoir is enhanced, the oil gas is prevented from being scattered and overflowed from the edges, and the oil gas is driven to the central position from the edges; the water injection well is arranged at the center of gravity position, so that the middle part of the oil deposit can provide a driving force for scattering and overflowing all around, and oil and gas are driven to the production wells distributed in the oil deposit. The arrangement structure of the production wells ensures that the narrower zone in the triangle and the production wells are fewer; the large-area and large-quantity production wells can make the single well obtain larger effective control reserves, and the problem that the traditional grid well pattern arrangement mode causes large and small control reserves of the single well in the triangular oil reservoir is solved, so that the overall recovery ratio of the triangular oil reservoir is greatly improved. In addition, the method can also solve the problem that the water content is higher than that of the conventional square or round oil reservoir in the existing narrow triangular oil reservoir exploitation process, delay the water breakthrough time of an oil well and reduce the water content. The well position of the adjusting well is reserved on the connecting line of the triangular gravity center and each auxiliary water injection well, other well positions are not arranged on the connecting line, enough drilling and production space can be provided for the later stage no matter the water injection adjusting well or the development adjusting well, the underground anti-collision risk can be avoided, and the problem of difficulty in later-stage exploitation of the oil field is solved to a great extent.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. The narrow triangular oil reservoir injection-production well pattern arrangement comprises water injection wells and production wells, and is characterized in that the water injection wells are arranged at vertexes, middle points of sides and gravity centers of a triangle, and the production wells are arranged on connecting lines of the gravity centers and the vertexes and connecting lines of the gravity centers and the middle points of the sides; a plurality of auxiliary water injection wells are arranged between each vertex and each middle point of the triangle at equal intervals; the production well on the connecting line of the gravity center of the triangle and each vertex is a vertical well, and the production well on the connecting line of the gravity center of the triangle and each midpoint of the side is an extended reach well or a horizontal well; wherein the water injection amount of the auxiliary water injection well is less than or equal to 1/2 of the water injection well; and the connection line of the gravity center of the triangle and each auxiliary water injection well is reserved with an adjusting well position.
2. The narrow triangular reservoir injection-production well pattern arrangement according to claim 1, wherein a projection of a connecting line between a wellhead and a well bottom of the extended reach well or the horizontal well on a horizontal plane is perpendicular to a connecting line between a center of gravity of the triangle and a midpoint of each side.
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| CN201710428709.5A CN106996288B (en) | 2017-06-08 | 2017-06-08 | Triangular oil reservoir injection-production well pattern arrangement |
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| CN111997575B (en) * | 2020-08-21 | 2022-07-29 | 中国海洋石油集团有限公司 | Irregular well pattern optimization water injection method based on planar displacement component |
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| AU2002364942A1 (en) * | 2001-10-24 | 2003-06-30 | Shell Internationale Research Maatschappij B.V. | Soil remediation well positioning in relation to curved obstructions |
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| GB1167465A (en) * | 1968-02-08 | 1969-10-15 | Texaco Development Corp | A Method for the Recovery of Hydrocarbons |
| CN1786411A (en) * | 2005-12-12 | 2006-06-14 | 大庆油田有限责任公司 | Method for optimizing area well net of enhancing lowest permeable reservoir oil extracting amount |
| CN105239989A (en) * | 2015-10-10 | 2016-01-13 | 中国石油天然气股份有限公司 | Oil recovery method |
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