CN112012714A - Well pattern structure for oil reservoir gas injection development and oil extraction method - Google Patents
Well pattern structure for oil reservoir gas injection development and oil extraction method Download PDFInfo
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- CN112012714A CN112012714A CN201910455085.5A CN201910455085A CN112012714A CN 112012714 A CN112012714 A CN 112012714A CN 201910455085 A CN201910455085 A CN 201910455085A CN 112012714 A CN112012714 A CN 112012714A
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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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Abstract
The invention provides a well pattern structure for oil deposit gas injection development and an oil extraction method, wherein the well pattern structure for oil deposit gas injection development comprises the following components: the first well bank comprises a plurality of first gas injection wells and a plurality of first oil production wells, and a first oil production well is arranged between every two adjacent first gas injection wells; the second well bank is arranged in parallel with the first well bank at intervals and comprises a plurality of second gas injection wells and a plurality of second oil production wells, one second oil production well is arranged between every two adjacent second gas injection wells, the plurality of second gas injection wells correspond to the plurality of first oil production wells in position, and the plurality of second oil production wells correspond to the plurality of first gas injection wells in position; and the third well bank is arranged in parallel with the second well bank at intervals, the second well bank comprises a plurality of third oil producing wells, and the plurality of third oil producing wells correspond to the plurality of second gas injection wells and the plurality of second oil producing wells in position one to one. The embodiment of the invention can realize effective utilization of the ultra-low permeability oil reservoir and improve the crude oil recovery efficiency.
Description
Technical Field
The invention relates to the technical field of oil reservoir development, in particular to a well pattern structure for oil reservoir gas injection development and an oil extraction method.
Background
The oil and gas require energy to move from the reservoir into the well and up to the surface, which energy is present in different conditions in the various reservoirs. Generally, in a reservoir, both oil and gas and rock have a certain elastic energy due to the action of the formation pressure. These energies naturally present in the oil reservoir function well at the initial stage of the oil reservoir development and should be fully utilized in the oil field development. The natural energy exploitation is to exploit the driving energy of the oil reservoir, but the practice tells us that the natural energy in one oil reservoir is limited and the driving energy is weak; moreover, the natural driving energy has short acting time, poor development effect and low final recovery ratio.
For ultra-low permeability reservoirs, the exploitation effect of natural energy exploitation is particularly poor. The ultra-low permeability reservoir refers to a reservoir with low permeability, low abundance and low single-well productivity of an oil reservoir. At a certain pressure difference, the capacity of a rock to allow the passage of fluids is called permeability, the magnitude of which is expressed in terms of permeability, which is a characteristic of the rock itself, generally measured by a laboratory, mostly air permeability, with less consideration given to the overlying pressure and the different fluids. The permeability of an ultra-low permeability reservoir is generally below 10md, which is characterized in that the physical property of the reservoir is poor and is easily damaged, the natural capacity of a single well is low or no natural capacity exists, and the ultra-low permeability reservoir can be economically and effectively developed by adopting an unconventional technology.
One development technology for low-permeability oil fields is artificial water injection, which indicates that water is injected into an oil layer to increase the oil displacement energy of the oil layer, and is one of the methods for prolonging the stable production period of the oil field and increasing the recovery ratio.
However, for most of ultra-low permeability oil reservoirs, due to poor physical properties and strong sensitivity of reservoirs, water channeling, water non-injection and other phenomena are easy to occur in water injection development, an effective displacement system is difficult to establish, and the development effect is poor because the later stage of natural energy development is mostly in a low-speed low-efficiency development stage.
Disclosure of Invention
The invention provides a well pattern structure for oil reservoir gas injection development and an oil extraction method, which aim to improve the crude oil recovery rate.
The technical scheme adopted by the invention for solving the technical problems is as follows: a well pattern structure for reservoir gas injection development, comprising: the first well bank comprises a plurality of first gas injection wells and a plurality of first oil production wells, and a first oil production well is arranged between every two adjacent first gas injection wells; the second well bank is arranged in parallel with the first well bank at intervals and comprises a plurality of second gas injection wells and a plurality of second oil production wells, one second oil production well is arranged between every two adjacent second gas injection wells, the plurality of second gas injection wells correspond to the plurality of first oil production wells in position, and the plurality of second oil production wells correspond to the plurality of first gas injection wells in position; and the third well bank is arranged in parallel with the second well bank at intervals, the second well bank comprises a plurality of third oil producing wells, and the plurality of third oil producing wells correspond to the plurality of second gas injection wells and the plurality of second oil producing wells in position one to one.
Further, the first well row, the second well row and the third well row are sequentially distributed in parallel at intervals along the oil reservoir construction tendency.
Further, the first well row comprises a first gas injection well and a first oil production well which are sequentially distributed at intervals along the extension direction of the first well row; the second well bank comprises a second oil production well and a second gas injection well which are sequentially distributed at intervals along the extension direction of the second well bank, the first gas injection well corresponds to the second oil production well in position, and the first oil production well corresponds to the second gas injection well in position; the connecting line direction of the first gas injection well and the second gas injection well is parallel to the direction of the artificial fracturing fracture.
Further, the spacing between the first well row and the second well row is the same as the spacing between the second well row and the third well row.
Further, the spacing between the first well row and the second well row is 180m to 420 m.
Further, the distance between the first gas injection well and the adjacent first oil production well, the distance between the second gas injection well and the adjacent second oil production well and the distance between the adjacent third oil production wells are the same.
The distance between the first gas injection well and the adjacent first oil production well is 180 m-210 m.
The invention also provides an oil extraction method, which adopts the well pattern structure for oil reservoir gas injection development to extract oil, and the oil extraction method comprises the following steps: step 10, injecting gas through a first gas injection well and a second gas injection well; step 20, oil recovery is carried out through the first oil production well, the second oil production well and the third oil production well; step 30, injecting gas through a first gas injection well and a first oil production well; and 40, oil recovery is carried out through the second gas injection well, the second oil production well and the third oil production well.
Further, step 30 is: and when the first oil production well or the second oil production well generates gas channeling, gas is injected through the first gas injection well and the first oil production well.
The beneficial effect of the invention is that,
the embodiment of the invention can realize effective utilization of the ultra-low permeability oil reservoir and improve the crude oil recovery efficiency. The ultra-low permeability reservoir is a large-dip-angle ultra-low permeability reservoir with a stratigraphic dip angle larger than 10 degrees and a reservoir permeability smaller than 10 md.
The rectangular well pattern with the construction tendency and the artificial fracturing direction considered can fully play the role of gas override, realize the gravity stable displacement of gas and improve the gas flooding wave and volume.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of a configuration for injecting gas using a first bank and a second bank in accordance with an embodiment of the present invention;
FIG. 2 is a schematic illustration of a configuration for injecting gas using a first well bank in accordance with an embodiment of the present invention.
Reference numbers in the figures: 110. a first well bank; 120. a second well bank; 130. a third well bank; 11. a first gas injection well; 12. a first production well; 21. a second gas injection well; 22. a second production well; 32. and a third oil production well.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, the present invention provides a well pattern structure for reservoir gas injection development comprising a first well bank 110, a second well bank 120, and a third well bank 130. The first well bank 110 includes a plurality of first gas injection wells 11 and a plurality of first oil production wells 12, and one first oil production well 12 is disposed between two adjacent first gas injection wells 11. The second well row 120 is arranged in parallel with the first well row 110 at intervals, the second well row 120 comprises a plurality of second gas injection wells 21 and a plurality of second oil production wells 22, one second oil production well 22 is arranged between two adjacent second gas injection wells 21, the plurality of second gas injection wells 21 correspond to the plurality of first oil production wells 12 in position, and the plurality of second oil production wells 22 correspond to the plurality of first gas injection wells 11 in position. The third well bank 130 and the second well bank 120 are arranged in parallel at intervals, the second well bank 120 comprises a plurality of third oil production wells 32, and the plurality of third oil production wells 32 correspond to the plurality of second gas injection wells 21 and the plurality of second oil production wells 22 in a one-to-one mode.
The embodiment of the invention can realize effective utilization of the ultra-low permeability oil reservoir and improve the crude oil recovery efficiency. The ultra-low permeability reservoir is a large-dip-angle ultra-low permeability reservoir with a stratigraphic dip angle larger than 10 degrees and a reservoir permeability smaller than 10 md.
The first well bank 110, the second well bank 120 and the third well bank 130 are sequentially spaced in parallel along the reservoir formation dip (vertical arrows in fig. 1 and 2).
Further, the first well row 110 comprises a first gas injection well 11 and a first oil production well 12 which are sequentially distributed at intervals along the extending direction of the first well row 110; the second well bank 120 comprises a second oil production well 22 and a second gas injection well 21 which are sequentially distributed at intervals along the extension direction of the second well bank 120, the first gas injection well 11 corresponds to the second oil production well 22 in position, and the first oil production well 12 corresponds to the second gas injection well 21 in position; the direction of the line connecting the first gas injection well 11 and the second gas injection well 21 is parallel to the direction of the artificial fracture (the oblique arrows in fig. 1 and 2).
The invention fully considers the influence of the oil reservoir tectonic tendency, the direction of artificial fracturing and the gas injection mode on the gas injection effect, effectively utilizes the overlap effect of gas while accelerating the effect taking speed of the oil production well, can delay the gas channeling of the oil well at the low structure position in the well pattern, can furthest improve the gas flooding wave and volume, and displace more residual oil to produce, thereby improving the overall recovery ratio, and the numerical simulation research of the oil reservoir shows that the invention can improve the recovery ratio by about 8 percent compared with the injection production of the conventional area well pattern.
In an embodiment of the present invention, the spacing between the first well row 110 and the second well row 120 is the same as the spacing between the second well row 120 and the third well row 130. The first well row 110 is spaced from the second well row 120 by 180m to 420 m.
The spacing between the first gas injection well 11 and the adjacent first production well 12, the spacing between the second gas injection well 21 and the adjacent second production well 22, and the spacing between the adjacent third production wells 32 are all the same. The distance between the first gas injection well 11 and the adjacent first oil production well 12 is 180m to 210 m.
In gas flooding, the first well row 110 is first spaced from the second well row 120 and staggered to begin gas injection, and the third production well 32 of the third well row 130 is fully recovered. When the gas injection wells of the first well bank 110 or the second well bank 120 have gas channeling, the first well bank 110 is completely injected with gas, the second well bank 120 is completely produced with oil, and the third oil production well 32 continues to produce oil.
The invention also provides an oil extraction method, which adopts the well pattern structure for oil reservoir gas injection development to extract oil, and the oil extraction method comprises the following steps:
step 10, injecting gas through a first gas injection well 11 and a second gas injection well 21;
step 30, injecting gas through the first gas injection well 11 and the first oil production well 12;
and step 40, oil recovery is carried out through the second gas injection well 21, the second oil production well 22 and the third oil production well 32.
Wherein the step 30 is: when the first oil recovery well 12 or the second oil recovery well 22 experiences gas channeling, gas injection is performed through the first gas injection well 11 and the first oil recovery well 12.
When the gas drive is performed on the ultra-low permeability reservoir, firstly, the first gas injection well 11 and the second gas injection well 21 begin to inject gas, the first gas injection well 11 and the second gas injection well 21 both produce oil, along with the continuous gas drive, the first oil production well 12 or the second oil production well 22 can generate a gas channeling phenomenon, at this time, the first gas injection well 11 and the first oil production well 12 inject gas uniformly, and the second gas injection well 21, the second oil production well 22 and the third oil production well 32 produce oil. Therefore, the adopted rectangular well pattern which takes the construction tendency and the artificial fracturing orientation into consideration can fully play the gas overlapping role, realize the gravity stable displacement effect of the gas and improve the gas flooding wave and the volume.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the embodiment of the invention can realize effective utilization of the ultra-low permeability oil reservoir and improve the crude oil recovery efficiency. The ultra-low permeability reservoir is a large-dip-angle ultra-low permeability reservoir with a stratigraphic dip angle larger than 10 degrees and a reservoir permeability smaller than 10 md.
The invention considers the construction tendency and the rectangular well pattern of the artificial fracturing fracture direction, can fully play the gas overburden function, realize the gravity stable displacement function of the gas and improve the gas flooding wave and the volume.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (9)
1. A well pattern structure for gas injection development of a reservoir, comprising:
the first well bank (110) comprises a plurality of first gas injection wells (11) and a plurality of first oil production wells (12), and one first oil production well (12) is arranged between every two adjacent first gas injection wells (11);
the second well bank (120) is arranged in parallel with the first well bank (110) at intervals, the second well bank (120) comprises a plurality of second gas injection wells (21) and a plurality of second oil production wells (22), one second oil production well (22) is arranged between every two adjacent second gas injection wells (21), the positions of the plurality of second gas injection wells (21) correspond to the positions of the plurality of first oil production wells (12), and the positions of the plurality of second oil production wells (22) correspond to the positions of the plurality of first gas injection wells (11);
and the third well row (130) is arranged in parallel with the second well row (120) at intervals, the second well row (120) comprises a plurality of third oil production wells (32), and the plurality of third oil production wells (32) correspond to the plurality of second gas injection wells (21) and the plurality of second oil production wells (22) in position one by one.
2. The well pattern structure for gas injection development of a reservoir of claim 1, wherein the first well row (110), the second well row (120) and the third well row (130) are sequentially spaced in parallel along the reservoir formation dip.
3. The well pattern structure for reservoir gas injection development of claim 1,
the first well row (110) comprises a first gas injection well (11) and a first oil production well (12) which are sequentially distributed at intervals along the extension direction of the first well row (110);
the second well bank (120) comprises a second oil production well (22) and a second gas injection well (21) which are sequentially distributed at intervals along the extension direction of the second well bank (120), the first gas injection well (11) corresponds to the second oil production well (22), and the first oil production well (12) corresponds to the second gas injection well (21);
the connecting line direction of the first gas injection well (11) and the second gas injection well (21) is parallel to the direction of the artificial fracture.
4. The well pattern structure for gas reservoir injection development of claim 1, wherein the spacing between the first bank (110) and the second bank (120) is the same as the spacing between the second bank (120) and the third bank (130).
5. The well pattern structure for reservoir gas injection development of claim 4, wherein the spacing between the first well row (110) and the second well row (120) is 180m to 420 m.
6. The well pattern structure for gas injection development of oil reservoirs according to claim 1, characterized in that the spacing between a first gas injection well (11) and an adjacent first oil production well (12), the spacing between a second gas injection well (21) and an adjacent second oil production well (22) and the spacing between adjacent third oil production wells (32) are all the same.
7. The well pattern structure for gas injection development of oil reservoirs according to claim 6, characterized in that the first gas injection well (11) is spaced from the adjacent first oil production well (12) by 180m to 210 m.
8. A method of recovering oil using the reservoir gas injection developed well pattern structure of any of claims 1 to 7, comprising:
step 10, injecting gas through a first gas injection well (11) and a second gas injection well (21);
20, oil recovery is carried out through a first oil recovery well (12), a second oil recovery well (22) and a third oil recovery well (32);
30, injecting gas through a first gas injection well (11) and a first oil production well (12);
and 40, oil recovery is carried out through the second gas injection well (21), the second oil production well (22) and the third oil production well (32).
9. The oil recovery method according to claim 8, characterized in that said step 30 is: when the first oil production well (12) or the second oil production well (22) generates gas channeling, gas is injected through the first gas injection well (11) and the first oil production well (12).
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Cited By (1)
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| RU2795640C1 (en) * | 2023-03-23 | 2023-05-05 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Method for developing low permeability oil field |
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| RU2795640C1 (en) * | 2023-03-23 | 2023-05-05 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Method for developing low permeability oil field |
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Application publication date: 20201201 |