CN210068122U - Shale gas reservoir horizontal well three-dimensional development well pattern structure - Google Patents
Shale gas reservoir horizontal well three-dimensional development well pattern structure Download PDFInfo
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- CN210068122U CN210068122U CN201920359567.6U CN201920359567U CN210068122U CN 210068122 U CN210068122 U CN 210068122U CN 201920359567 U CN201920359567 U CN 201920359567U CN 210068122 U CN210068122 U CN 210068122U
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Abstract
The utility model discloses a shale gas reservoir horizontal well three-dimensional development well pattern structure, include: at least one row of horizontal wells (1) in a ground preset well field; each row of horizontal wells (1) comprises at least four horizontal wells (1) which are sequentially arranged according to the numerical label sequence; each horizontal well (1) numbered odd has a first horizontal section (11) disposed along a first shale development reservoir (R1), and each horizontal well (1) numbered even has a second horizontal section (12) disposed along a second shale development reservoir (R2). The well pattern structure can effectively improve the longitudinal exploitation degree of the shale gas reservoir.
Description
Technical Field
The utility model relates to a shale gas reservoir exploitation technical field, in particular to shale gas reservoir horizontal well three-dimensional development well pattern structure.
Background
Because the horizontal section of the horizontal well has a larger contact area with the fracturing fracture, the horizontal well positioned in the shale gas reservoir can obtain a larger drainage area of the shale gas reservoir after perforation and fracturing, and further the shale gas reservoir without the fracture or with few fracture channels can be economically developed by applying the well pattern of the horizontal well.
In the prior art, a shale gas reservoir horizontal well pattern is usually distributed in a manner of two rows of multi-well horizontal well patterns, as shown in fig. 1, one horizontal well row (the row in which horizontal wells a1, a2, A3 and a4 are located) develops one side of an optimal shale development reservoir, and the other horizontal well row (the row in which horizontal wells B1, B2, B3 and B4 are located) develops the other side of the same optimal shale development reservoir.
However, two rows of multi-well horizontal well patterns in the prior art are developed only for the optimal shale development reservoir in the longitudinal direction, and when more than one high-quality shale development reservoir in the longitudinal direction needs to be developed, the horizontal well patterns in the prior art are not applicable any more, which easily results in low longitudinal exploitation degree of the shale gas reservoir.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a shale gas reservoir horizontal well three-dimensional development well pattern structure to improve the vertical degree of using of shale gas reservoir.
Specifically, the method comprises the following technical scheme:
the embodiment of the utility model provides a shale gas reservoir horizontal well three-dimensional development well pattern structure, the well pattern structure includes: at least one row of horizontal wells in a ground preset well field;
each horizontal well comprises at least four horizontal wells which are sequentially arranged according to the numerical label sequence;
each horizontal well with the odd number of the number labels is provided with a first horizontal section arranged along a first shale development reservoir, and each horizontal well with the even number of the number labels is provided with a second horizontal section arranged along a second shale development reservoir;
the length of a seam extending in the plane direction of each first fracturing fracture communicated with the first horizontal section and/or the length of a seam extending in the plane direction of each second fracturing fracture communicated with the second horizontal section is less than half of the ground distance between any two adjacent horizontal wells;
the height of the seam extending in the longitudinal direction of each first fractured fracture and/or the height of the seam extending in the longitudinal direction of each second fractured fracture is smaller than the bottom-hole spacing between the longitudinally adjacent first horizontal sections and the second horizontal sections.
In a possible implementation manner, the length of the ground preset well site ranges from 90 m to 150m, and the width ranges from 80m to 120 m.
In a possible implementation mode, the value range of the ground distance between two adjacent horizontal wells which are randomly positioned in the same row is 5-8 m.
In a possible implementation mode, the distance between any two adjacent rows of horizontal wells is 30-35 m.
In a possible implementation manner, a range of a distance between any two adjacent first horizontal segments or any two adjacent second horizontal segments is 250-400 m.
In one possible implementation manner, the length of the first horizontal section arranged along the downward inclination direction of the first shale development reservoir is greater than the length of the first horizontal section arranged along the upward inclination direction of the first shale development reservoir.
In one possible implementation, the length of the second horizontal segment arranged along the downward inclination direction of the second shale development reservoir is greater than the length of the second horizontal segment arranged along the upward inclination direction of the second shale development reservoir.
In a possible implementation manner, the length of the first horizontal segment arranged along the downward inclination direction of the first shale development reservoir or the length of the second horizontal segment arranged along the downward inclination direction of the second shale development reservoir ranges from 1250 m to 2800 m.
In a possible implementation manner, the length of the first horizontal segment arranged along the upward inclination direction of the first shale development reservoir or the length of the second horizontal segment arranged along the upward inclination direction of the second shale development reservoir ranges from 1050 m to 1700 m.
In a possible implementation manner, each of the first horizontal segments or the second horizontal segments is divided into a plurality of sub-segments, and a length of each sub-segment ranges from 55 m to 80 m.
In a possible implementation manner, each subsection is provided with a plurality of perforation clusters, and the range of the distance between any two adjacent perforation clusters is 15-30 m.
In a possible implementation manner, the length of each perforation cluster ranges from 0.6 m to 1.0 m.
The embodiment of the utility model provides a technical scheme's beneficial effect includes at least:
1. through setting up at least one row of horizontal well that is located ground preset well field, every row of horizontal well includes four at least horizontal wells that arrange in proper order according to the number designation, and every horizontal well that the number designation is the odd number has the first horizontal segment that sets up along first page rock development reservoir, and every horizontal well that the number designation is the even number has the second horizontal segment that sets up along second shale development reservoir, has realized the development to two different shale development reservoirs of same well field, has effectively improved the vertical degree of using of shale gas reservoir.
2. The length of the seam extending in the plane direction of each first fracturing fracture communicated on the first horizontal section and/or the length of the seam extending in the plane direction of each second fracturing fracture communicated on the second horizontal section is smaller than half of the ground distance between any two adjacent horizontal wells, the height of the seam extending in the longitudinal direction of each first fracturing fracture and/or the height of the seam extending in the longitudinal direction of each second fracturing fracture is smaller than the bottom hole distance between the first horizontal section and the second horizontal section which are adjacent in the longitudinal direction, and therefore the horizontal and longitudinal cross-hole interference can be prevented, and smooth development of the shale gas reservoir is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a well pattern layout of a horizontal well of a shale gas reservoir in the prior art;
fig. 2 is a schematic diagram of a shale gas reservoir horizontal well three-dimensional development well pattern structure provided by the embodiment of the utility model.
The reference numerals in the drawings denote:
1-a horizontal well is formed,
11-the first horizontal segment of the first horizontal segment,
12-the second horizontal segment,
r1-first-page rock development reservoir,
r2-a second shale development reservoir,
j1-the first horizontal well,
j2-a second horizontal well,
j3-a third horizontal well,
j4-a fourth horizontal well,
j5-a fifth horizontal well,
j6-the sixth horizontal well,
f1-first fracture (frac),
f2-second fracture.
Detailed Description
Shale gas refers to unconventional natural gas existing in reservoir rock systems mainly containing organic-rich shale, is a biochemical-derived gas, a thermal-derived gas or a mixture of the biochemical-derived gas and the thermal-derived gas, which are continuously generated and can exist in natural cracks and pores in a free state. At present, exploration and development of shale gas reservoirs are enhanced in all countries in the world, and the existing shale gas exploitation technologies can comprise a horizontal well technology, a multi-layer fracturing technology, a clean water fracturing technology, a repeated fracturing technology and the like, wherein the horizontal well technology is the most main exploitation technology. The horizontal well can obtain a larger drainage area of a shale gas reservoir, so that the shale gas reservoir can be effectively and economically developed by arranging a horizontal well pattern. In order to solve the problem that the shale gas reservoir that current horizontal well pattern structure exists vertically uses the degree low, the utility model provides a can improve shale gas reservoir horizontal well three-dimensional development well pattern structure of the vertical degree of using of shale gas reservoir.
Before further detailed description of the embodiments of the present invention, the terms of orientation, such as "upward inclination direction" and "downward inclination direction", in the embodiments of the present invention all use the inclination of the actual shale gas reservoir as a reference. It is understood that the direction of extension toward the ground is an upward inclination direction, and the direction of extension away from the ground is a downward inclination direction. The above-mentioned orientation noun is only used for clearly describing the shale gas reservoir horizontal well three-dimensional development well pattern structure of the embodiment of the utility model, does not have the meaning of limiting the protection scope of the utility model.
Unless defined otherwise, all technical terms used in the embodiments of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
In order to make the technical solutions and advantages of the present invention clearer, the following will describe the embodiments of the present invention in further detail with reference to the accompanying drawings.
The embodiment of the utility model provides a shale gas reservoir horizontal well three-dimensional development well pattern structure, the schematic diagram of its structure is shown as figure 2, and this well pattern structure includes: the horizontal well 1 is characterized in that the horizontal well 1 is at least one row in a preset well field on the ground, and each row of horizontal wells 1 comprises at least four horizontal wells 1 which are sequentially arranged according to a numerical label sequence.
Each horizontal well 1, numbered odd, has a first horizontal section 11 disposed along the first shale development reservoir R1 and each horizontal well 1, numbered even, has a second horizontal section 12 disposed along the second shale development reservoir R2. It can be understood that the first shale development reservoir R1 and the second shale development reservoir R2 are both shale gas reservoir reservoirs, and both shale gas reservoir reservoirs are high-quality shale development reservoirs, and can be obtained through seismic exploration data in an earlier stage; meanwhile, the first horizontal segment 11 and the second horizontal segment 12 should be oriented along the direction of the minimum horizontal principal stress of the first shale development reservoir R1 and the second shale development reservoir R2 as much as possible, and the direction of the minimum horizontal principal stress of the first shale development reservoir R1 and the second shale development reservoir R2 can be obtained by combining the fracturing data, the well logging data and the seismic data of the evaluation well.
Wherein the length of the seam extending in the plane direction of each first fracture F1 communicated on the first horizontal segment 11 and/or the length of the seam extending in the plane direction of each second fracture F2 communicated on the second horizontal segment 12 is less than half of the ground distance between any two adjacent horizontal wells 1;
the height of the longitudinally extending slot of each first fracture F1 and/or the height of the longitudinally extending slot of each second fracture F2 is less than the bottom hole spacing between longitudinally adjacent first and second horizontal segments 11, 12.
It is understood that after the first horizontal segment 11 and the second horizontal segment 12 are drilled and completed, perforation fracture modification needs to be performed on each of the first horizontal segment 11 and the second horizontal segment 12 to increase the drainage area, and the slits extending in the plane direction and the slits extending in the longitudinal direction of the first fracture F1 or the second fracture F2 are artificial slits formed by the perforation fracture modification. For the sake of easy and clear viewing of the first fracture F1 and the second fracture F2, in fig. 2, only one first fracture F1 is shown on each first horizontal segment 11, and one second fracture F2 is shown on the second horizontal segment 12, but in actual production, a plurality of first fractures F1 are provided on each first horizontal segment 11, and a plurality of second fractures F2 are provided on each second horizontal segment 12.
Meanwhile, it should be noted that the ground distance herein refers to the shortest distance between two horizontal wells 1 on the ground.
The utility model discloses shale gas reservoir horizontal well three-dimensional development well pattern structure, lie in at least one row of horizontal well 1 in ground default well field through the setting, every row of horizontal well 1 includes four at least horizontal well 1 that arrange in proper order according to the digital label order, every horizontal well 1 that the digital label is the odd number has the first horizontal segment 11 that sets up along first page rock development reservoir R1, every horizontal well 1 that the digital label is the even number has the second horizontal segment 12 that sets up along second shale development reservoir R2, the development to the different shale development reservoirs of same well field has been realized, the vertical degree of drawing forth of shale gas reservoir has effectively been improved.
Further, the length of the seam extending in the plane direction by connecting each first fractured fracture F1 communicated on the first horizontal section 11 and/or the length of the seam extending in the plane direction by connecting each second fractured fracture F2 communicated on the second horizontal section 12 is less than half of the ground distance between any two adjacent horizontal wells 1; the height of the seam extending in the longitudinal direction of each first fracturing fracture F1 and/or the height of the seam extending in the longitudinal direction of each second fracturing fracture F2 is smaller than the bottom-hole distance between the first horizontal section 11 and the second horizontal section 12 which are adjacent in the longitudinal direction, so that the inter-well interference between the planes and the longitudinal direction can be prevented, and the shale gas reservoir development can be ensured to be smoothly carried out.
The following further description is given to the shale gas reservoir horizontal well three-dimensional development well pattern structure of the embodiment of the utility model:
for the selected ground preset well site, a gentle area with two good shale development reservoirs is selected, and a certain area is provided. In actual work, the position of the ground preset well site can be determined through field exploration.
The length of the ground preset well site can be 90-150 m, and the width can be 80-120 m, so that the well site is guaranteed to have a sufficient construction range. Of course, it is understood that if the identified flat area is large enough, the length and width of the predetermined wellsite at the surface may be greater than the maximum value of the range of values corresponding to the length and width.
When the ground preset well site comprises two or more rows of horizontal wells 1, the distance between any two adjacent rows of horizontal wells 1 can be limited to 30-35 m, so that the problem that the ground construction scale is large due to overlarge distance between the two adjacent rows of horizontal wells 1 is solved, and the development cost is further increased.
For each row of horizontal wells 1, the number of the horizontal wells 1 may be four, or may be six, and as shown in fig. 2, the number of the horizontal wells is a first horizontal well J1, a second horizontal well J2, a third horizontal well J3, a fourth horizontal well J4, a fifth horizontal well J5, or a sixth horizontal well J6, or may be eight. In the embodiment of the present invention, the value range of the number of each row of horizontal wells 1 is preferably four to eight. In the actual well pattern structure layout, the number of the horizontal wells 1 can be determined according to actual needs, which is not described herein.
In the position relation, the value range of the ground distance between two adjacent horizontal wells 1 which are randomly positioned in the same row can be 5-8 m, so that a plurality of horizontal wells 1 can be arranged in a ground preset well field.
For the first level 11 and the second level 12, the first level 11 is located in the first shale development reservoir R1, and the second level 12 is located in the second shale development reservoir R2, wherein the difference in burial depth of the first shale development reservoir R1 and the second shale development reservoir R2 should be greater than 30 m.
Meanwhile, different horizontal sections of different horizontal wells 1 can be arranged in a staggered manner in the longitudinal direction. Wherein, a horizontal segment that is located upper strata on vertical projects to the lower floor, and its position can be located the middle of two adjacent horizontal segments of lower floor on the vertical to reduce the risk that upper and lower layer horizontal segment pressed through.
For example, as shown in fig. 2, the first shale development reservoir R1 may be located lower in the longitudinal direction than the second shale development reservoir R2, that is, the second shale development reservoir R2 is an upper reservoir in the longitudinal direction, the first shale development reservoir R1 is a lower reservoir in the longitudinal direction, and the second horizontal section 12 may be located in the middle of two adjacent first horizontal sections 11 projected to the first shale development reservoir R1.
In order to ensure the pressure scale and the volume transformation effect, the value range of the distance between any two adjacent first horizontal sections 11 or any two adjacent second horizontal sections 12 is 250-400 m, so that a reasonable distance is ensured between the adjacent horizontal sections.
In terms of length setting, the length of the first horizontal section 11 disposed along the downward sloping direction of the first shale development reservoir R1 is greater than the length of the first horizontal section 11 disposed along the upward sloping direction of the first shale development reservoir R1; the length of the second horizontal section 12 disposed in the declination direction of the second shale development reservoir R2 is greater than the length of the second horizontal section 12 disposed in the declination direction of the second shale development reservoir R2, that is, the length of the horizontal section in the declination direction is greater than the length of the horizontal section in the declination direction regardless of the first shale development reservoir R1 or the second shale development reservoir R2.
So set up, because in the work progress, along the decline direction of shale development reservoir bed compare in the tilt up direction and be changeed in the well drilling, the construction degree of difficulty is little, and the well drilling cost is low.
In one possible implementation manner, the length of the first horizontal segment 11 arranged along the downward inclination direction of the first shale development reservoir R1 or the length of the second horizontal segment 12 arranged along the downward inclination direction of the second shale development reservoir R2 ranges from 1250 m to 2800 m; the length of the first horizontal section 11 arranged along the upward inclination direction of the first shale development reservoir R1 or the length of the second horizontal section 12 arranged along the upward inclination direction of the second shale development reservoir R2 ranges from 1050 m to 1700 m.
On the basis of the structure, perforation can be carried out in a sectional clustering mode. Each of the first horizontal segments 11 or the second horizontal segments 12 may be divided into a plurality of sub-segments, and the length of each sub-segment ranges from 55 m to 80 m.
So configured, each subsection may be perforated with each subsection.
Furthermore, each subsection is provided with a plurality of perforating clusters, the range of the distance between any two adjacent perforating clusters can be 15-30 m, and the range of the length of each perforating cluster can be 0.6-1.0 m.
In a possible example, take six horizontal wells 1 that the single row that is shown in fig. 2 was laid as an example, develop the shale gas reservoir that includes two shale development reservoirs in vertical, can be right according to following step the utility model discloses shale gas reservoir horizontal well three-dimensional development well pattern structure of embodiment specifically lays:
through field exploration, a gentle area is searched in a main development area of the shale gas reservoir, and a ground preset well site is determined.
Before drilling construction is carried out, shale gas reservoir characteristics of different intervals in the longitudinal direction can be obtained according to comprehensive analysis of relevant data such as three-dimensional seismic data, logging of adjacent wells (evaluation wells and development wells), production test data and the like, two optimal shale development reservoirs are determined to be a first shale development reservoir R1 and a second shale development reservoir R2, and the distance between the two shale development reservoirs in the longitudinal direction is larger than or equal to 30 m.
The method is implemented by starting from a horizontal well 1 with an odd number, sequentially drilling a first horizontal well J1, a third horizontal well J3 and a first horizontal section 11 of a fifth horizontal well J5, ensuring that each first horizontal section 11 is positioned in the middle of a first shale development reservoir R1 in the drilling process, and completing the well by using a casing after the drilling is completed.
After the horizontal well 1 with the odd number label is implemented, the horizontal well 1 with the even number label is implemented, the second horizontal section 12 of the second horizontal well J2, the fourth horizontal well J4 and the sixth horizontal well J6 is drilled in sequence, and after drilling is completed, casing pipe is adopted for well completion.
After drilling and completion of all horizontal wells 1, performing segmented clustering perforation and volume fracturing on each first horizontal section 11 respectively, and forming a plurality of first fracturing fractures F1 on each first horizontal section 11 to reform a first shale development reservoir R1; and performing segmented clustering perforation and volume fracturing on each second horizontal segment 12, and forming a plurality of second fracturing fractures F2 on each second horizontal segment 12 to reconstruct a second shale development reservoir R2.
After the first shale development reservoir R1 and the second shale development reservoir R2 are transformed, the production operation of the shale gas reservoir is started.
It should be noted that, when volume fracturing is performed, the fracturing scale and the sand adding amount should be controlled, and the first fracturing fracture F1 and the second fracturing fracture F2 are ensured not to be communicated with each other in a penetrating manner while the volume fracturing modification scale is enlarged as much as possible, so that the shale gas development effect is influenced.
In the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a shale gas reservoir horizontal well three-dimensional development well pattern structure which characterized in that, the well pattern structure includes: at least one row of horizontal wells (1) in a ground preset well field;
each row of horizontal wells (1) comprises at least four horizontal wells (1) which are sequentially arranged according to the numerical label sequence;
each horizontal well (1) with odd number has a first horizontal section (11) arranged along a first shale development reservoir (R1), and each horizontal well (1) with even number has a second horizontal section (12) arranged along a second shale development reservoir (R2);
wherein the length of the seam extending in the plane direction of each first fracture (F1) communicated on the first horizontal section (11) and/or the length of the seam extending in the plane direction of each second fracture (F2) communicated on the second horizontal section (12) is less than half of the ground distance between any two adjacent horizontal wells (1);
the height of the longitudinally extending slot of each first fracture (F1) and/or the height of the longitudinally extending slot of each second fracture (F2) is less than the bottom-hole spacing between longitudinally adjacent first (11) and second (12) horizontal segments.
2. The shale gas reservoir horizontal well stereoscopic development well pattern structure of claim 1, wherein the length of the ground preset well site ranges from 90 m to 150m, and the width ranges from 80m to 120 m.
3. The shale gas reservoir horizontal well three-dimensional development well pattern structure is characterized in that the range of the ground distance between any two adjacent horizontal wells (1) in the same row is 5-8 m.
4. The shale gas reservoir horizontal well three-dimensional development well pattern structure is characterized in that the distance between any two adjacent rows of horizontal wells (1) is 30-35 m.
5. The shale gas reservoir horizontal well three-dimensional development well pattern structure is characterized in that the interval between any two adjacent first horizontal sections (11) or any two adjacent second horizontal sections (12) ranges from 250 m to 400 m.
6. The shale gas reservoir horizontal well stereoscopic development well pattern structure according to claim 1, wherein a length of a first horizontal section (11) arranged along a downward inclination direction of the first shale development reservoir (R1) is greater than a length of a first horizontal section (11) arranged along an upward inclination direction of the first shale development reservoir (R1).
7. The shale gas reservoir horizontal well stereoscopic development well pattern structure of claim 1, wherein a length of a second horizontal segment (12) disposed along a declining direction of the second shale development reservoir (R2) is greater than a length of a second horizontal segment (12) disposed along an declining direction of the second shale development reservoir (R2).
8. The shale gas reservoir horizontal well three-dimensional development well pattern structure is characterized in that the length of the first horizontal segment (11) arranged along the downward inclination direction of the first shale development reservoir (R1) or the length of the second horizontal segment (12) arranged along the downward inclination direction of the second shale development reservoir (R2) ranges from 1250 m to 2800 m.
9. The shale gas reservoir horizontal well stereoscopic development well pattern structure according to claim 6 or 7, wherein the length of the first horizontal section (11) arranged along the upward-inclining direction of the first shale development reservoir (R1) or the length of the second horizontal section (12) arranged along the upward-inclining direction of the second shale development reservoir (R2) ranges from 1050 m to 1700 m.
10. The shale gas reservoir horizontal well three-dimensional development well pattern structure according to claim 1, wherein each first horizontal section (11) or the second horizontal section (12) is divided into a plurality of subsections, and the length of each subsection ranges from 55 m to 80 m.
11. The shale gas reservoir horizontal well stereoscopic development well pattern structure of claim 10, wherein each subsection is provided with a plurality of perforation clusters, and the interval between any two adjacent perforation clusters ranges from 15 m to 30 m.
12. The shale gas reservoir horizontal well three-dimensional development well pattern structure as claimed in claim 11, wherein the length of each perforation cluster ranges from 0.6 m to 1.0 m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111980658A (en) * | 2020-09-02 | 2020-11-24 | 中国石油天然气股份有限公司 | Drilling method and drilling system |
| CN113530499A (en) * | 2020-04-21 | 2021-10-22 | 中国石油天然气股份有限公司 | Perforating method and perforating device for shale oil-gas horizontal well with small well spacing |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530499A (en) * | 2020-04-21 | 2021-10-22 | 中国石油天然气股份有限公司 | Perforating method and perforating device for shale oil-gas horizontal well with small well spacing |
| CN111980658A (en) * | 2020-09-02 | 2020-11-24 | 中国石油天然气股份有限公司 | Drilling method and drilling system |
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