A fracturing process suitable for infill development of shale gas wells

A shale gas well and fracturing technology, which is applied in the field of fracturing technology for intensified development of shale gas wells, can solve problems such as difficult breakthroughs, limited effectiveness, and reduced formation pressure coefficients, and achieve the effect of increasing complexity

Active Publication Date: 2021-09-24
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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AI Technical Summary

Problems solved by technology

With the advancement of domestic shale gas development, infill development has gradually become the trend of shale gas development. Compared with the first-stage development wells, infill wells have smaller well spacing with adjacent wells (usually less than or equal to 300m), lower formation pressure coefficients, and lower reservoir pressure. The characteristics of layer stress change, old fracture induction effect and exhaustion induction effect make the original fracturing technology no longer suitable for infill well stimulation. The main problems of this technology are: single-stage stimulation strength is limited, and the stimulation range is too large It is easy to cause interference to adjacent wells or communicate with old fractures, and the construction cost of a single well is relatively high, etc.
[0003] The research results of relevant documents and patents on the fracturing technology of horizontal wells disclosed at present show that a large amount of fracturing technology research is based on the existing mature fracturing technology, and it is difficult to break through the shackles of the original fracturing technology ideas. The fracturing application of shale gas wells has limited success, so it is necessary to establish a fracturing process suitable for infill development of shale gas wells

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  • A fracturing process suitable for infill development of shale gas wells
  • A fracturing process suitable for infill development of shale gas wells
  • A fracturing process suitable for infill development of shale gas wells

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Embodiment 1

[0031] see Figure 1-4 , a fracturing process suitable for infill development of shale gas wells, comprising the following steps:

[0032] (1) Data collection, including well logging data and regional in-situ stress prediction results;

[0033] (2) Stress and compressibility analysis. According to the water stress difference in the area where the horizontal well is located, the stress value and the change of the stress field under different fracture spacing conditions are simulated and calculated. The different fracture spacing conditions include 15, 20, 25, 30, and 35m. Other distances are also possible;

[0034] (3) Segment-cluster spacing design, select the segment-cluster spacing based on the induced stress difference obtained by the simulation calculation in step (2), and minimize the segment-cluster spacing within an appropriate range. The section-cluster spacing includes section spacing and cluster spacing, and the selection of the cluster spacing should meet the requ...

Embodiment 2

[0041] The other content of this embodiment is the same as that of Embodiment 1, the difference is that when sand is added continuously, 3 kinds of particle sizes are combined, and the initial powder pottery-sand ratio is designed to be 3%, so as to ensure the safety of construction and at the same time play the role of grinding holes. The subsequent sand ratio is mainly used to fill the micro-fractures in the near-wellbore zone, providing favorable conditions for the injection in the medium sand stage; the sand ratio in the medium sand stage starts at 3-4%, which acts as the main support for the fractures, and the highest sand ratio in this stage is generally designed It is 13-19%; the coarse sand is mainly selected for trailing at the final stage to achieve high conductivity support in the near-wellbore area, and considering the safety and effectiveness of on-site construction, the sand ratio is designed to be 14-17%.

[0042]The invention relates to a new shale gas fracturin...

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Abstract

The invention relates to the technical field of horizontal well fracturing, and discloses a new fracturing process suitable for infill development of shale gas wells, comprising the following steps: (1) data collection; (2) stress and compressibility analysis; (3) (4) cluster number design; (5) midway temporary plugging design; (6) construction displacement design; (7) fracturing scale design; (8) sand adding method design. The essence of the present invention is to design the target horizontal well by analyzing the in-situ stress characteristics and compressibility of a single well in the intensification development shale gas well to reduce the interval between clusters and multiple clusters. The pump injection design of plugging and continuous sanding can finally achieve the effect of improving the complexity of single well stimulation and the efficiency of reservoir stimulation, realize the volume stimulation of all horizontal wells, and increase the complexity of fractures. The improvement of the program has greatly increased the intensity of the reconstruction, and at the same time reduced the construction cost of a single well.

Description

technical field [0001] The invention relates to the technical field of horizontal well fracturing, in particular to a fracturing process suitable for infill development of shale gas wells. Background technique [0002] Multi-stage fracturing of shale gas horizontal wells is a commonly used horizontal well completion method. This technology can form multiple hydraulic fractures at different positions in the same reservoir, which can increase the volume of oil and gas drainage in oil and gas reservoirs and reduce oil and gas from the reservoir. The resistance of the reservoir to the wellbore flow. At present, domestic horizontal well fracturing technology is mainly pumped bridge plug perforation combined with staged fracturing technology. The main method is: the length of a single fracturing stage is 70-80m, the distance between clusters is 25-35m, and the single-stage perforation is 3 Cluster equal-length perforation is the main method, adopting variable viscosity, variable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q50/02E21B43/26E21B43/267G06F119/14
CPCG06Q50/02E21B43/26E21B43/267G06F30/20
Inventor 刘尧文李远照李婷陆亚秋张驰张晗苏慕博文崔静高东伟米瑛
Owner CHINA PETROLEUM & CHEM CORP
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