Pulse sand fracturing method realizing high fracture conductivity of cracks

Abstract

The invention discloses a pulse sand fracturing method realizing high fracture conductivity of cracks and belongs to the field of oilfield development. The pulse sand fracturing method includes steps of firstly, fracturing an ultralow-permeability reservoir horizontal well sectionally in multiple clusters, and judging whether high fracture conductivity of the cracks is formed or not by pulse sand fracturing by researching characteristics of the ultralow-permeability reservoir, if yes, executing a second step; secondly, solidifying sand by fiber fracturing fluid by pulse sand adding process in the fracturing process, and forming 'cylinder' support in an artificial crack, so that a channel network high in flow conductivity is formed in the artificial crack, and the artificial crack has high flow conductivity. By the pulse sand fracturing method realizing high fracture conductivity of the cracks, conductivity of the cracks can be improved, and single-well yield is greatly increased. The method has remarkable effect on the site, and by the method, via practical comparison, single-well yield is increased by 20% as compared with that of conventional fracturing optimized design of horizontal wells in the same area and is five to seven times of adjacent straight wells.

Description

technical field [0001] The invention relates to the field of oilfield development, in particular to a pulse type sanding fracturing method for realizing high conductivity of fractures after oil well fracturing. Background technique [0002] With the continuous deepening of oilfield exploration and development, taking Changqing Oilfield as an example, the proportion of ultra-low permeability reservoirs is increasing, and improving single well production has become the core of ultra-low permeability reservoir development. [0003] However, due to the tightness of such reservoirs, fine pore throats, strong reservoir heterogeneity, and well-developed natural fractures, the seepage characteristics of reservoirs are complex. Conventional fracturing was used in the early stage. After horizontal well fracturing, the conventional sand laying profile caused the loss of production flow pressure, which made it difficult to achieve the purpose of improving fracture conductivity. Field ap...

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Problems solved by technology

[0005] In order to solve the problem that conventional fracturing is difficult to achieve the purpose of improving fracture conductivity, and the range of single-well production of horizontal wells is not obvious in the field application, the embodiment of the present invention provides a method for achieving high fracture conductivity after oil well fracturing. Pulse sand fracturing method with conductivity