CN112943196A - Fixed-point multi-stage fracturing method for improving longitudinal transformation degree of dense thick layer - Google Patents
Fixed-point multi-stage fracturing method for improving longitudinal transformation degree of dense thick layer Download PDFInfo
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- CN112943196A CN112943196A CN202110092096.9A CN202110092096A CN112943196A CN 112943196 A CN112943196 A CN 112943196A CN 202110092096 A CN202110092096 A CN 202110092096A CN 112943196 A CN112943196 A CN 112943196A
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- 230000009466 transformation Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000011161 development Methods 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 40
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 11
- 230000000977 initiatory effect Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 208000010392 Bone Fractures Diseases 0.000 claims 2
- 206010017076 Fracture Diseases 0.000 claims 2
- 238000007634 remodeling Methods 0.000 claims 2
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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Abstract
The invention discloses a fixed-point multistage fracturing method for improving the longitudinal transformation degree of a dense thick layer. Compared with the conventional volume fracturing technology, the method can effectively reduce the reconstruction cost, has important significance for the efficient development of the dense thick layer, and is expected to be developed into the main body reconstruction technology of the ultra-low permeability class III dense thick layer.
Description
Technical Field
The invention relates to the technical field of fracturing modification of oil and gas wells, in particular to a fixed-point multi-stage fracturing method for improving the longitudinal modification degree of a dense thick layer.
Background
Along with the continuous deep development of the Changqing oil field, the proportion of ultra-low permeability III type compact thick layers is increased, the thickness of an oil layer of the reservoir is larger, but the physical property is poor, the longitudinal movement difficulty is high, mature multi-stage sand fracturing reformation is adopted in the early stage, and the yield of oil testing and production is low; at present, the concept of concentrated perforation and large-scale fracturing is adopted for a main body, but fracture simulation and monitoring show that a reservoir cannot be fully used longitudinally, the improvement effect needs to be improved, meanwhile, the improvement cost is greatly increased due to large-scale improvement, and the pressure for improving the effect and reducing the cost is higher.
Disclosure of Invention
The invention aims to provide a fixed-point multistage fracturing method for improving the longitudinal transformation degree of a dense thick layer, so as to overcome the defects in the prior art, and compared with the conventional volume fracturing technology, the fixed-point multistage fracturing method can effectively reduce the transformation cost, has important significance for the efficient development of the dense thick layer, and is expected to be developed into a main transformation technology of an ultra-low permeability III type dense thick layer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fixed-point multistage fracturing method for improving the longitudinal transformation degree of a dense thick layer is characterized in that fixed-point multistage fracturing fully used in the longitudinal direction of the dense thick layer is realized by adopting temporary plugging fracturing according to the development condition of a reservoir interlayer, and the transformation of the dense thick layer and independent fracture initiation and extension of each section of fracture are realized by combining a fracturing construction curve and dipole sound wave tests before and after fracturing.
Further, the method comprises the following steps:
s1, performing segmented perforation on the upper part, the middle part and the lower part of the dense thick layer of the oil reservoir by adopting fixed-point multi-stage perforation;
s2, perforating at a fixed point according to the step S1, and then fracturing the dense thick layer for the first time (namely fracturing the whole body, wherein the artificial fracture is opened at the section with low ground stress according to the reservoir conditions at the perforating position); closing the well after pressing, adding a temporary plugging agent after the crack is closed, and performing primary temporary plugging and fracturing;
s3, after the temporary plugging agent blocks the position of the first fracture initiation borehole in the step S2, the fracture is continuously initiated from other positions (the other two sections except the fracture are started firstly), and then secondary fracturing is carried out;
and S4, when the crack is closed, adding a temporary plugging agent to block the blasthole of the second crack, initiating cracks from other positions (the other 1 section of the crack is opened in the front 2 sections) to finish the third-stage fracturing, and finishing the whole fixed-point third-stage fracturing, thereby finishing the longitudinal transformation of the oil layer thick layer.
Further, in step S1, the fixed point multi-stage perforation is 3 sections, and the length of each section of perforation is 1-2 m.
Further, in steps S2-S4, the displacement volume of each fracturing is 3m3/min。
Further, in the steps S2-S4, the sand amount per fracturing is 20-30m3The sand ratio (the ratio of the volume of the sand to the volume of the sand carrying net liquid) is 10 percent.
Further, the thickness of the reservoir layer is 20-60 m.
Compared with the prior art, the invention has the following beneficial technical effects:
in order to improve the transformation effect of the reservoir, a fixed-point multistage fracturing technology which adopts temporary blocking fracturing to realize the longitudinal full utilization of a compact thick layer is explored and formed according to the development condition of a reservoir interlayer from the fracturing angle, and analysis such as a fracturing construction curve, dipole sound wave tests before and after fracturing and the like is combined to show that the process realizes the effective transformation of the compact thick layer, and each section of fracture independently cracks and extends; compared with the conventional volume fracturing technology, the technology can effectively reduce the reconstruction cost; the method has important significance for efficient development of the dense thick layer, is expected to be developed into a main body transformation technology of the ultra-low permeability III type dense thick layer, improves the longitudinal transformation degree of the ultra-low permeability III type dense thick layer, and improves the single well yield of the reservoir.
By adopting the method, the field test of 5 wells is carried out in a dense thick layer in the Longdong area, and the dipole acoustic logging after the pressing shows that the reservoir is fully transformed longitudinally, and the oil testing yield after the pressing reaches more than 2 times of that of an adjacent well; meanwhile, compared with the adjacent well volume fracturing modification, the fracturing modification cost is saved by 20 ten thousand per well.
Drawings
FIG. 1 is a schematic of a fixed point multi-stage fracturing of the present invention; wherein, the step (a) is first fracturing reformation, (b) is second fracturing reformation, and (c) is third fracturing reformation;
FIG. 2 is a diagram of the effect of the fixed-point multi-stage fracturing on the dipole acoustic logging before and after.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the invention adopts a fixed-point multistage fracturing technology for realizing the longitudinal and full utilization of a dense thick layer by temporary plugging fracturing, and combines the fracturing construction curve, dipole acoustic wave tests before and after fracturing and other analyses to show that the process realizes the effective transformation of the dense thick layer, and each section of fracture independently starts and extends.
The fixed-point multistage fracturing method for improving the longitudinal transformation degree of the dense thick layer is used for solving the problem that the single well yield is low due to the low longitudinal transformation degree of the existing dense thick layer.
The perforating mode is a fixed-point multi-stage perforating mode (dispersed and small-segment perforating mode). That is, the perforation positions are required to be distributed at the upper part, the middle part and the lower part of the reservoir, and the length of each section of perforation is 1-2 m.
And secondly, the fracturing modification mode is fixed-point multi-section small-scale fracturing modification. Namely small-scale fracturing reformation is respectively carried out on the upper part, the middle part and the lower part of the dense thick layer.
Thirdly, fixed-point multistage fracturing is realized by adopting a temporary plugging fracturing mode. After the well is closed after each fracturing, and after the artificial fracture is closed, the blasthole is blocked by the temporary plugging agent, so that the reservoir stratum is forced to be fractured again at different positions.
Specifically, fixed-point perforation is firstly carried out on the upper part, the middle part and the lower part of a reservoir, the length of each section of perforation is 1-2m, then the first fracturing reconstruction, as shown in figure 1 (a), the artificial fracture is firstly opened from the section with the lowest ground stress (shown as the middle part of the reservoir in the figure, actually any section of the upper part, the middle part and the lower part can be determined by the ground stress condition of the reservoir), then carrying out second fracturing reconstruction, as shown in figure 1 (b), adding the temporary plugging agent for the first time to block the blast hole position at the first fracturing fracture, then the artificial fracture is firstly opened from the section with lower ground stress (shown as the lower part of the reservoir in the figure, actually any section of the upper part and the lower part can be determined by the ground stress condition of the reservoir), finally the third fracturing modification, as shown in fig. 1 (c), the temporary plugging agent is added again to block the position of the blasthole at the fracture initiation of the second fracturing, and then the artificial fracture is opened from the section with relatively high ground stress (shown as the upper part of the reservoir on the way); thereby realizing the purposes of fully using the reservoir in the longitudinal direction and improving the longitudinal transformation degree.
The following is further illustrated with reference to specific examples:
the fracturing reformation of a tight reservoir with a thick reservoir layer of 60m is taken as an example for explanation:
firstly, a perforation mode: conventionally reforming a large-section perforation at the middle lower part of a reservoir, wherein the perforation is 1 section and the length is 9 m; and the fixed-point multi-stage perforation is the upper, middle and lower subsection perforation of the reservoir, and the perforation is 3 sections, and each section is 1-2 m.
A fracturing transformation mode: the conventional fracturing is reformed into 1-time volume fracturing with the discharge capacity of 6m3Min, sand amount 60m3The sand ratio is 10 percent; the fixed-point multistage fracturing is reformed into 3 times of small-scale fracturing, and the fracturing scale of each time is 3m3Min, sand amount 20-30m3And the sand ratio is 10 percent.
Thirdly, fixed-point multistage fracturing is realized by adopting a temporary plugging fracturing mode; first fracturing is carried out in combination with fixed-point perforation; after pressing, closing the well, adding a temporary plugging agent after the crack is closed, performing primary temporary plugging and fracturing, and after the temporary plugging agent blocks the position of the primary cracking borehole, continuously cracking the crack from other positions and performing secondary fracturing; and (3) after the crack is closed again, adding a temporary plugging agent to block the secondary crack blasthole, initiating cracks from other positions to finish the third-stage fracturing, and finishing the whole fixed-point multi-stage fracturing, thereby achieving the purpose of fully transforming the thick layer longitudinally.
Fig. 2 is a diagram showing the DSI fracturing effect logging evaluation before and after fracturing of a dense thick layer which is reformed by the present invention, and it can be seen from a comparison diagram that the anisotropy before fracturing of a reservoir (a dotted frame in the diagram) is displayed on the left and the anisotropy after fracturing of the reservoir (a frame in the diagram) is obviously enhanced on the right, indicating that the reservoir is fully reformed in the longitudinal direction.
Claims (6)
1. A fixed-point multistage fracturing method for improving the longitudinal transformation degree of a dense thick layer is characterized in that fixed-point multistage fracturing fully used in the longitudinal direction of the dense thick layer is realized by adopting temporary plugging fracturing according to the development condition of a reservoir interlayer, and the transformation of the dense thick layer and independent cracking and extension of each section of crack are realized by combining a fracturing construction curve and dipole sound wave tests before and after fracturing.
2. The method for improving the longitudinal transformation degree of the dense thick layer by the fixed-point multistage fracturing, according to claim 1, is characterized by comprising the following steps:
s1, performing segmented perforation on the upper part, the middle part and the lower part of the dense thick layer of the oil reservoir by adopting fixed-point multi-stage perforation;
s2, perforating at fixed points according to the step S1, and then performing first fracturing on the dense thick layer; closing the well after pressing, adding a temporary plugging agent after the crack is closed, and performing primary temporary plugging and fracturing;
s3, after the temporary plugging agent blocks the position of the primary fracture initiation borehole in the step S2, the fracture is continuously initiated from other positions, and then secondary fracturing is carried out;
and S4, when the crack is closed, adding a temporary plugging agent to block the blasthole of the second crack, initiating cracks from other positions to finish the third-stage fracturing, and finishing the whole fixed-point third-stage fracturing, thereby finishing the longitudinal transformation of the oil layer thick layer.
3. The fixed-point multistage fracturing method for improving the longitudinal transformation degree of the dense thick layer according to claim 2, wherein in the step S1, the fixed-point multistage perforation is 3 sections, and the length of each section of perforation is 1-2 m.
4. The method for site-specific multi-stage fracturing to improve the longitudinal remodeling degree of dense thick layer according to claim 2, wherein the displacement of each fracturing is 3m in steps S2-S43/min。
5. The fixed-point multi-stage fracturing method for improving the longitudinal reconstruction degree of the dense thick layer according to claim 2, wherein in the steps S2-S4, the sand amount per fracturing is 20-30m3The sand ratio was 10%.
6. The method for improving the longitudinal remodeling of the dense thick bed by the fixed-point multistage fracturing, according to claim 2, wherein the thickness of the reservoir stratum is 20-60 m.
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| CN108661616A (en) * | 2017-03-29 | 2018-10-16 | 中国石油化工股份有限公司 | A kind of separate stratum fracfturing method suitable for sandstone reservoir |
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- 2021-01-23 CN CN202110092096.9A patent/CN112943196A/en active Pending
Patent Citations (4)
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| US20180094514A1 (en) * | 2015-04-30 | 2018-04-05 | Landmark Graphics Corporation | Shale geomechanics for multi-stage hydraulic fracturing optimization in resource shale and tight plays |
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