Reservoir well pattern structure

Abstract

The present invention provides a reservoir well pattern structure, which includes: a reservoir structure, which includes a gas reservoir, an oil reservoir, and a water reservoir distributed in sequence from top to bottom; a gas production well inserted into the interior of the gas reservoir; an oil production well inserted into the interior of the oil reservoir; an injection well inserted into the interior of the water reservoir; and an auxiliary well communicating with the injection well, where the auxiliary well is arranged outside the reservoir structure so as to be able to observe the water level height of the auxiliary well. Through the present invention, the technical problem that in oil and gas recovery, gas and oil are prone to be mixed with each other and the recovery efficiency is relatively low is alleviated.

Description

Technical Field

[0001] The present invention relates to the technical field of oil reservoir exploitation, and in particular to an oil reservoir well pattern structure. Background Art

[0002] The well pattern refers to the distribution of oil, gas, and water injection wells during oil and gas field development. It's a crucial component of reservoir development plans, impacting oilfield development efficiency, ultimate recovery, and the economic benefits of oilfield development. The layout of a reservoir's well pattern typically begins by dividing the reservoir's total geological reserves by the single-well controlled reserves determined through conventional well testing to determine the required number of production wells. Based on this, a grid-like well pattern is designed, with each row of production wells corresponding to a row of water injection wells. This well pattern facilitates the recovery of gas and oil from the reservoir.

[0003] However, during the recovery process, the collected gas and oil are easily mixed with each other, resulting in low recovery efficiency and the oil wells are prone to rapid water breakthrough, which is not conducive to ensuring the exploitation of the oil reservoir. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil reservoir well pattern structure to alleviate the technical problem that gas and oil are easily mixed with each other during oil and gas recovery, resulting in low recovery efficiency.

[0005] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] The present invention provides an oil reservoir well pattern structure, comprising:

[0007] The reservoir structure includes gas reservoirs, oil reservoirs and water reservoirs distributed in order from top to bottom;

[0008] a gas production well inserted into the gas reservoir;

[0009] an oil production well inserted into the oil reservoir;

[0010] a water injection well inserted into the water reservoir;

[0011] An auxiliary well is connected to the water injection well and is arranged outside the oil reservoir structure so that the water level of the auxiliary well can be observed.

[0012] In a preferred embodiment, the reservoir well pattern structure includes a transverse connecting well, one end of which is connected to the bottom end of the water injection well, and the other end of which is connected to the bottom end of the auxiliary well.

[0013] In a preferred embodiment, half of the water injection volume of the water injection well is greater than or equal to the water injection volume of the auxiliary well.

[0014] In a preferred embodiment, the reservoir well pattern structure includes a first horizontal water well distributed in the water reservoir, and the first horizontal water well is communicated with the injection well.

[0015] In a preferred embodiment, the reservoir well pattern structure includes a first arc-shaped well that is concave downward, and the first horizontal water well is communicated with the injection well through the first arc-shaped well.

[0016] In a preferred embodiment, the reservoir well pattern structure includes at least one first tree-shaped well group, and the first tree-shaped well group includes a first branch well connected to the first horizontal water well and a second branch well connected to the first branch well; water outlet holes are provided in both the first branch well and the second branch well.

[0017] In a preferred embodiment, the reservoir well pattern structure includes a second horizontal water well distributed in the oil reservoir, and the second horizontal water well is communicated with the injection well.

[0018] In a preferred embodiment, the reservoir well pattern structure includes a second arc-shaped well that is concave downward, and the second horizontal water well is communicated with the injection well through the second arc-shaped well.

[0019] In a preferred embodiment, the reservoir well pattern structure includes at least one second tree-shaped well group, and the second tree-shaped well group includes a third branch well connected to the second horizontal water well and a fourth branch well connected to the third branch well; water outlet holes are provided in both the third branch well and the fourth branch well.

[0020] In a preferred embodiment, the reservoir well pattern structure includes a third horizontal water well distributed in the gas reservoir, and the third horizontal water well is communicated with the injection well.

[0021] In a preferred embodiment, the reservoir well pattern structure includes a third arc-shaped well that is concave downward, and the third horizontal water well is communicated with the injection well through the third arc-shaped well.

[0022] In a preferred embodiment, the reservoir well pattern structure includes at least one third tree-shaped well group, and the third tree-shaped well group includes a fifth branch well connected to the third horizontal water well and a sixth branch well connected to the fifth branch well; water outlet holes are provided in both the fifth branch well and the sixth branch well.

[0023] The features and advantages of the present invention are:

[0024] This reservoir well pattern allows water to be injected into the auxiliary wells. This water then flows into the injection wells and is transported into the water reservoir. This increases the water volume within the water reservoir, which in turn drives the gas and oil production wells upward, facilitating the extraction of gas and oil from the gas and oil reservoirs.

[0025] Because the auxiliary well is connected to the water injection well, by observing the water level height of the auxiliary well, the height of the water injection level inside the water injection well can be understood, so as to understand the water level height inside the water reservoir, and thus understand the water injection distribution structure inside the oil reservoir structure after water injection, which is convenient for controlling the water injection volume and avoiding the mixing of the collected gas and oil to improve the recovery efficiency; it is also beneficial to avoid the situation where the oil well sees water too quickly, which is beneficial to ensure the exploitation of the oil reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A vertical schematic diagram of the oil reservoir well pattern structure provided by the present invention;

[0028] Figure 2 A vertical schematic diagram of a water injection well in the oil reservoir well pattern structure provided by the present invention;

[0029] Figure 3 A horizontal schematic diagram of a horizontal water well in the oil reservoir well pattern structure provided by the present invention.

[0030] Description of Figure Numbers:

[0031] 10. Reservoir structure; 11. Gas reservoir; 12. Oil reservoir; 13. Water reservoir;

[0032] 21. Gas production well; 22. Oil production well; 23. External pump body flange;

[0033] 30. Injection well; 31. Auxiliary well; 311. Scale; 32. Horizontal connecting well; 33. Water outlet;

[0034] 41. First horizontal water well; 42. First arc well; 43. First branch well group; 431. First branch well; 432. Second branch well;

[0035] 51, second horizontal well; 52, second arc well; 53, second branch well group; 531, third branch well; 532, fourth branch well;

[0036] 61. The third horizontal water well; 62. The third arc well; 63. The third branch well group; 631. The fifth branch well; 632. The sixth branch well. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] The present invention provides an oil reservoir well pattern structure, such as Figure 1 As shown, the reservoir well network structure includes: an oil reservoir structure 10, a gas production well 21, an oil production well 22, a water injection well 30 and an auxiliary well 31; the oil reservoir structure 10 includes a gas reservoir 11, an oil reservoir 12 and a water reservoir 13 distributed from top to bottom; the gas production well 21 is inserted into the gas reservoir 11; the oil production well 22 is inserted into the oil reservoir 12; the water injection well 30 is inserted into the water reservoir 13; the auxiliary well 31 is connected to the water injection well 30, and the auxiliary well 31 is arranged outside the oil reservoir structure 10 so that the water level of the auxiliary well 31 can be observed.

[0039] This reservoir well pattern allows water to be injected into the auxiliary wells 31. Because the auxiliary wells 31 are connected to the water injection wells 30, water flows into the water injection wells 30 and is then transported into the water reservoir 13. This increases the water volume within the water reservoir 13, which in turn drives the gas production wells 21 and oil production wells 22 upward, facilitating the extraction of gas from the gas reservoir 11 and oil from the oil reservoir 12.

[0040] Because the auxiliary well 31 is connected to the water injection well 30, by observing the water level of the auxiliary well 31, the height of the water injection level inside the water injection well 30 can be understood, so as to understand the water level inside the water reservoir 13, and thus understand the water injection distribution structure inside the oil reservoir structure 10 after water injection, which is convenient for controlling the water injection volume and avoiding the mixing of the collected gas and oil to improve the recovery efficiency; and it is also beneficial to avoid the situation where the oil well sees water quickly, which is beneficial to ensure the exploitation of the oil reservoir.

[0041] like Figure 1 As shown, the upper end of the gas production well 21 and the upper end of the oil production well 22 are respectively connected to the external pump body flange 23.

[0042] In an embodiment of the present invention, the reservoir well pattern structure includes a horizontally connected well 32. One end of the horizontally connected well 32 is connected to the bottom end of the injection well 30, and the other end of the horizontally connected well 32 is connected to the bottom end of the auxiliary well 31. The injection well 30 and the auxiliary well 31 are connected through the horizontally connected well 32. Water is injected into the auxiliary well 31, and the water flows through the horizontally connected well 32 to the injection well 30, which is beneficial to ensuring that the water levels of the auxiliary well 31 and the injection well 30 are kept consistent. As Figure 1 shown, the auxiliary well 31 may be provided with a scale 311 to facilitate accurately observing the water level height of the auxiliary well 31 through the scale 311.

[0043] Furthermore, half of the water injection volume of the injection well 30 is greater than or equal to the water injection volume of the auxiliary well 31, which is convenient for the water in the injection well 30 to be injected into the oil layer structure. Specifically, it may be that half of the cross-sectional area of the inner cavity of the injection well 30 is greater than or equal to the cross-sectional area of the inner cavity of the auxiliary well 31 to control the relationship between the water injection volumes of the two.

[0044] In the water injection and oil production technology, it is difficult to fill the water in the reservoir structure 10 after water injection, and it is easy to occur the situation that the oil well sees water quickly, which is not conducive to ensuring the exploitation of the reservoir. Therefore, the inventor has made further improvements to the reservoir well pattern structure.

[0045] As Figure 2 shown, the reservoir well pattern structure includes a first horizontal water well 41 distributed in the water storage layer 13, and the first horizontal water well 41 is connected to the injection well 30. The water in the injection well 30 flows through the first horizontal water well 41 to the water storage layer 13, which is beneficial to injecting water into the water storage layer 13.

[0046] Furthermore, the reservoir well pattern structure includes a first arc-shaped well 42, and the first arc-shaped well 42 is concave downward. The first horizontal water well 41 is connected to the injection well 30 through the first arc-shaped well 42. The water in the injection well 30 flows through the first arc-shaped well 42 and then is delivered to the first horizontal water well 41, which is beneficial to ensuring that the injected water can flow smoothly from the first horizontal water well 41 to the water storage layer 13.

[0047] The reservoir well pattern structure includes at least one first tree-shaped well group 43. The first tree-shaped well group 43 includes a first branch well 431 connected to the first horizontal water well 41 and a second branch well 432 connected to the first branch well 431. Both the first branch well 431 and the second branch well 432 are provided with water outlet holes 33. Water flows into the first branch well 431 and the second branch well 432 through the first horizontal water well 41 and is discharged through the water outlet holes 33 into the water storage layer 13 to realize uniform water injection inside the water storage layer 13. Both the first branch well 431 and the second branch well 432 extend in the water storage layer 13. Preferably, as Figure 2 and Figure 3As shown, the first horizontal water well 41 is connected to a plurality of first branch well groups 43; the first horizontal water well 41 is connected to both sides of the injection well 30.

[0048] As Figure 2 shown, the reservoir well pattern structure includes a second horizontal water well 51 distributed in the oil reservoir 12. The second horizontal water well 51 is communicated with the injection well 30, and the water in the injection well 30 flows through the second horizontal water well 51 to the oil reservoir 12, which is beneficial to injecting water into the oil reservoir 12.

[0049] Further, the reservoir well pattern structure includes a second arc-shaped well 52 which is concave downward. The second horizontal water well 51 is communicated with the injection well 30 through the second arc-shaped well 52. The water in the injection well 30 flows through the second arc-shaped well 52 and then is delivered to the second horizontal water well 51, which is beneficial to ensuring that the injected water can flow smoothly from the second horizontal water well 51 to the oil reservoir 12.

[0050] The reservoir well pattern structure includes at least one second branch well group 53. The second branch well group 53 includes a third branch well 531 connected to the second horizontal water well 51 and a fourth branch well 532 connected to the third branch well 531. The third branch well 531 and the fourth branch well 532 are both provided with water outlet holes 33. Water flows into the third branch well 531 and the fourth branch well 532 through the second horizontal water well 51 and is discharged through the water outlet holes 33 into the oil reservoir 12, realizing uniform water injection inside the oil reservoir 12. The third branch well 531 and the fourth branch well 532 both extend in the oil reservoir 12. Preferably, as Figure 2 and Figure 3 shown, the second horizontal water well 51 is connected to a plurality of second branch well groups 53; the second horizontal water well 51 is connected to both sides of the injection well 30.

[0051] As Figure 2 shown, the reservoir well pattern structure includes a third horizontal water well 61 distributed in the gas reservoir 11. The third horizontal water well 61 is communicated with the injection well 30, and the water in the injection well 30 flows through the third horizontal water well 61 to the gas reservoir 11, which is beneficial to injecting water into the gas reservoir 11.

[0052] Further, the reservoir well pattern structure includes a third arc-shaped well 62 which is concave downward. The third horizontal water well 61 is communicated with the injection well 30 through the third arc-shaped well 62. The water in the injection well 30 flows through the third arc-shaped well 62 and then is delivered to the third horizontal water well 61, which is beneficial to ensuring that the injected water can flow smoothly from the third horizontal water well 61 to the gas reservoir 11.

[0053] The reservoir well pattern structure includes at least one third branch well group 63, which includes a fifth branch well 631 connected to the third lateral water well 61, and a sixth branch well 632 connected to the fifth branch well 631; the fifth branch well 631 and the sixth branch well 632 are both provided with a water outlet 33, and water flows into the fifth branch well 631 and the sixth branch well 632 through the third lateral water well 61, and is discharged through the water outlet 33 into the gas reservoir 11, thereby achieving uniform water injection into the gas reservoir 11. The fifth branch well 631 and the sixth branch well 632 both extend within the gas reservoir 11. Preferably, as Figure 2 and Figure 3 As shown, the third transverse water well 61 is connected to a plurality of third branch well groups 63 ; both sides of the water injection well 30 are respectively connected to the third transverse water well 61 .

[0054] Figure 2 and Figure 3 The illustrated reservoir well pattern utilizes a layered arrangement of first, second, and third lateral water wells 41, 51, and 61, as well as a first, second, and third branch well groups 43, 53, and 63 each with a water outlet 33, to facilitate uniform water injection into the reservoir structure 10. This layered, three-dimensional well pattern significantly improves the efficiency of developing layered reservoirs. Furthermore, after the water reservoir 13 is fully filled, water can be injected into the oil and gas reservoirs 12 and 11, facilitating the extraction of gas and oil from the reservoir structure 10.

[0055] The above descriptions are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. An oil reservoir well pattern structure, characterized in that, Comprising: A reservoir structure, which includes a gas reservoir, an oil reservoir, and a water reservoir that are distributed in sequence from top to bottom; A gas production well, which is inserted into the interior of the gas reservoir; An oil production well, which is inserted into the interior of the oil reservoir; An injection well for injecting water into the reservoir structure, which is inserted into the interior of the water reservoir; An auxiliary well for injecting water into the injection well, which is in communication with the injection well, and the auxiliary well is provided outside the reservoir structure so as to be able to observe the water level height of the auxiliary well; The reservoir well pattern structure includes a horizontal communication well, one end of the horizontal communication well is in communication with the bottom end of the injection well, and the other end of the horizontal communication well is in communication with the bottom end of the auxiliary well; The reservoir well pattern structure includes a first horizontal water well distributed in the water reservoir, and the first horizontal water well is in communication with the injection well; The reservoir well pattern structure includes a first arc-shaped well that is concave downward, and the first horizontal water well is in communication with the injection well through the first arc-shaped well; The reservoir well pattern structure includes at least one first tree-shaped well group, and the first tree-shaped well group includes a first branch well connected to the first horizontal water well and a second branch well connected to the first branch well; water outlet holes are provided in both the first branch well and the second branch well; The reservoir well pattern structure includes a second horizontal water well distributed in the oil reservoir, and the second horizontal water well is in communication with the injection well; The reservoir well pattern structure includes a third horizontal water well distributed in the gas reservoir, and the third horizontal water well is in communication with the injection well.

2. The reservoir well pattern structure according to claim 1, characterized in that, Half of the water injection volume of the injection well is greater than or equal to the water injection volume of the auxiliary well.

3. The reservoir well pattern structure according to claim 1, characterized in that, The reservoir well pattern structure includes a second arc-shaped well that is concave downward, and the second horizontal water well is in communication with the injection well through the second arc-shaped well.

4. The reservoir well pattern structure according to claim 1, characterized in that, The reservoir well pattern structure includes at least one second tree-shaped well group, and the second tree-shaped well group includes a third branch well connected to the second horizontal water well and a fourth branch well connected to the third branch well; water outlet holes are provided in both the third branch well and the fourth branch well.

5. The reservoir well pattern structure according to claim 1, characterized in that, The reservoir well pattern structure includes a third arc-shaped well that is concave downward, and the third horizontal water well is in communication with the injection well through the third arc-shaped well.

6. The reservoir well pattern structure according to claim 1, wherein The reservoir well pattern structure includes at least one third tree-shaped well group, and the third tree-shaped well group includes a fifth branch well connected to the third horizontal water well and a sixth branch well connected to the fifth branch well; water outlet holes are provided in both the fifth branch well and the sixth branch well.

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