New fracturing process suitable for encrypted development of shale gas well

Abstract

The invention relates to the technical field of horizontal well fracturing, and discloses a new fracturing process suitable for the encrypted development of a shale gas well, which comprises the following steps of (1) collecting the data; (2) analyzing the stress and compressibility; (3) designing the interval of the segment clusters; (4) designing the number of clusters; (5) carrying out the temporary plugging design in the midway; (6) designing the construction displacement; (7) designing a fracturing scale; and (8) designing a sand adding mode. According to the essence of the method, the small-section multi-cluster segmented design of reducing the section cluster spacing is carried out on the target horizontal well by analyzing the single well ground stress characteristics and the compressibility of the shale gas well of encrypted development; meanwhile, the pumping design of the variable-density perforation, midway ball throwing temporary plugging and continuous sand adding is combined, and finally, the effect of improving the single well transformation complexity and the reservoir transformation efficiency is achieved, the volume transformation of the whole horizontal well isachieved, the crack complexity is improved, the transformation strength is improved to a larger extent through improvement of a sand adding mode and a pumping program, and meanwhile the single well construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of horizontal well fracturing, in particular to a new 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, varia...

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 new fracturing process suitable for infill development of shale gas wells

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