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水力射孔技术是一种新型的完井方式,深穿透水力射孔技术辅助定向水力压裂可以实现油气层改造和油气井增产。但是,水力射孔套管会在孔眼处造成应力集中,使得局部应力过大而削弱了套管和水泥环的强度,可能会影响套管的使用寿命。因此,文章利用有限元软件建立了射孔套管的三维有限元模型,分析了水力射孔后套管管体的应力分布,重点研究了水力射孔参数—孔密、孔径、孔深、射孔方位角等对套管强度的影响规律。分析结果表明,沿着最大水平地应力方向深穿透水力射孔,选择合适的孔密、孔径可将射孔对套管的损害降至最小。研究结果为提高水力射孔完井设计水平提供了一定的参数依据。
Hydraulic perforation technology is a new type of completion method. Deep penetrating hydraulic perforation technology can assist the hydraulic fracturing to reform the hydrocarbon reservoir and increase the production of oil and gas wells. However, the use of a hydro-perforated casing creates stress concentrations in the perforations that can cause local stresses to be excessive, weakening the strength of the casing and cement sheath, and may affect the useful life of the casing. Therefore, a three-dimensional finite element model of perforation casing was established by using finite element software. Stress distribution of the casing tube after hydrodynamic perforation was analyzed. The key points of the hydraulic perforation parameters-hole density, hole diameter, hole depth, The influence of hole azimuth on casing strength. The analysis results show that the perforation can minimize damage to the casing by selecting the appropriate hole density along the maximum horizontal stress direction through the perforation. The results provide some parameters for improving the design level of hydraulic perforation completion.