低渗致密气藏压裂水平井产能分析与完井优化

来源期刊:中南大学学报(自然科学版)2016年第11期

论文作者:李波 贾爱林 东博 甯波 王军磊

文章页码:3775 - 3784

关键词:压裂水平井;裂缝;井筒;产能;正交试验;优化

Key words:fractured horizontal wells; fracture; wellbore; productivity; orthogonal test; optimization

摘    要:基于压裂水平井产能影响因素较多,基于常规产能评价方法的单因素敏感性分析法不能对各因素的影响程度做出综合定量评价,在建立并求解考虑裂缝干扰、裂缝污染表皮系数、裂缝不同分布形式、裂缝与井筒有限导流的压裂水平井产能预测模型基础上,通过正交试验分析得到压裂水平井产能影响因素的主次顺序。研究结果表明:压裂水平井产能影响因素的主次顺序依次为地层渗透率、裂缝污染表皮系数、地层有效厚度、裂缝半长、裂缝条数、裂缝导流能力、水平段长度、井筒半径和裂缝分布形式,其中地层渗透率、裂缝污染表皮和有效厚度对产能的影响尤为显著,而井筒半径和裂缝分布形式对产能无明显影响。对于实际水平井,在储层渗透率、有效厚度和储层规模等因素均无法改变的条件下,应尽量降低作业对储层的伤害,并根据实际地质参数进一步优化裂缝参数,这对提高水平井产量和开发经济效益具有重要意义。

Abstract: Since there are many factors affecting the productivity of fractured horizontal wells, sensitivity analysis method based on conventional productivity evaluation method can not evaluate the impact of each factor comprehensively and quantitatively, a productivity prediction model was established considering interactive disturbance among fractures, skin factor of polluted fracture, fracture distribution form, finite flow in fracture and wellbore. A numerical iterative method to the model was also derived. Based on the prediction method, the sequence of the factors affecting the productivity of fractured horizontal wells was determined by orthogonal tests. The results show that the sequence of the factors affecting the productivity of fractured horizontal wells is as follows: formation permeability, pollution skin factor of fracture, net pay thickness, fracture half-length, number of fracture, fracture conductivity, effective length of horizontal wellbore, wellbore radius and fracture distribution form. It is worth pointing out that the effect of formation permeability, pollution skin of fracture and net pay thickness is significant, while the effect of wellbore radius and fracture distribution form is weaker. For a practical horizontal well, there remains precondition that formation permeability, reservoir permeability and reservoir scale are limited. Eliminating the formation damage due to stimulation and further optimizing fracture parameters based on geological data will be of great importance in improving productivity of individual well and increasing economic benefit.

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