Volume fracturing method for activating natural fractures on large scale
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A natural fracture and volume fracturing technology, which is applied in the field of oil drilling, can solve the problems that the expected effect of volume fracturing is not achieved and the complexity of fractures is not high enough.
Active Publication Date: 2020-02-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Although this method has a certain effect on activating natural fractures at all levels, the current fracture monitoring results show that the probability of complex fractures in horizontal well staged fracturing is only about 50%, and about half of the fractures are single fractures
Even in complex fractures, the degree of complexity of the fractures is not high enough to achieve the expected effect of volume fracturing
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Embodiment 1
[0091] For a shale gas well, the steps and results are as follows:
[0092] 1. Firstly, the key reservoir parameters of the well were evaluated based on geological, seismic and logging data, and the locations of geological engineering sweet spots and segment clusters were determined.
[0093] 2. Using ECLIPSE and MEYER software to optimize the fracturing fracture length, fracturing scale and number of fracturing stages, etc., according to the optimization results, the fracturing stage is divided into 18 stages, and the amount of fracturing fluid in a single stage is 1800m 3 , a single-stage propping dose of 70m 3 .
[0094] 3. According to the specific implementation step 6 in the invention, the acid type and formula are optimized, and injected according to the corresponding displacement.
[0095] 4, adopt the low-viscosity slippery water of viscosity 1.5mPa.s, liquid volume generally accounts for 25% of the total liquid volume that the invention implements step 4) optimizes, ...
Embodiment 2
[0108] For a shale gas well, the steps and results are as follows:
[0109] 1. Firstly, the key reservoir parameters of the well were evaluated based on geological, seismic and logging data, and the locations of geological engineering sweet spots and segment clusters were determined.
[0110] 2. Using ECLIPSE and MEYER software to optimize the fracturing fracture length, fracturing scale and number of fracturing stages, etc., according to the optimization results, the fracturing stage is divided into 18 stages, and the amount of fracturing fluid in a single stage is 1800m 3 , the propping dose of a single section is 65m 3 .
[0111] 3. According to the specific implementation step 6 in the invention, the acid type and formula are optimized, and injected according to the corresponding displacement.
[0112] 4, adopt the low-viscosity slippery water of viscosity 1.5mPa.s, liquid quantity generally accounts for 30% of the total liquid quantity that the invention implements step...
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Abstract
The invention discloses a volume fracturing method for activating natural fractures on a large scale. The volume fracturing method comprises the steps that step (1) parameter evaluation and optimization are performed; step (2) run bridge plug perforation joint operation is performed; step (3) acid pretreatment operation is performed; step (4) fracture making construction by low-viscosity slipperywater or acid slippery water is performed; step (5) major fracture blocking construction by mixed proppants and sand is performed; step (6) stepped displacement increase construction is performed; step (7) mixed injection construction of the 140-210 mesh proppant and the 70-140 mesh proppant is performed; step (8) major fracture flushing construction by high-viscosity fracturing fluid without sandis performed; step (9) second and third major fracture blocking and subsequent construction are performed, the steps (5)-(8) are repeated, and then the steps (5)-(7) are repeated; step (10) construction of a major fracture by high-viscosity fracturing fluid with sand is performed; and step (11) displacement operation is performed. According to the volume fracturing method, the complexity of the fractures and the reconstruction volume can be increased during reconstruction of a reservoir, and thus, efficient production increase of a shale gas well is realized.
Description
technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a volume fracturing method for activating natural fractures in a large area. Background technique [0002] At present, volume fracturing technology is widely used in various types of oil and gas reservoirs such as shale, carbonate rock (volume acid fracturing instead of volume fracturing), and sandstone. The so-called volume fracturing is based on the staged fracturing of horizontal wells or layered fracturing of vertical wells, which greatly increases the complexity of fractures, thereby forming a criss-cross fracture network and ensuring that there are no seepage dead zones within the fracture sweep range. exist. The key here is to use hydraulic action to activate a large number of natural fractures, otherwise, the complexity of the fractures will be difficult to increase significantly. [0003] Chinese patent CN106545324A discloses a method for opening multiple ho...
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