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射孔完井参数对试井理论曲线的影响
Alternative TitleEffects of perforated completion parameters on well test type curves
欧阳伟平; 刘曰武
Source Publication石油学报
2013-05
Volume34Issue:3Pages:528-534
ISSN0253-2697
Abstract射孔完井是石油天然气开采过程中最常用的完井方式之一。对于确定的油气储层,完井方式决定了单井产能大小。一般常用二维裸眼井模型来进行射孔井的试井资料解释及单井产能的确定,但这种方法分析的结果可能存在较大的误差。因此根据射孔完井的特征以及储层渗透率各向异性特征,建立了一种适合于射孔井的三维数值试井模型。利用三维有限元数值方法求解该模型,获得了射孔井的试井理论曲线和压力分布场。通过分析试井理论曲线的特征及压力分布场中的流体三维流动特征,明确了试井理论曲线的6个流动阶段:井筒储存阶段;第一过渡阶段;早期局部径向流阶段;第二过渡阶段;系统径向流阶段;外边界作用阶段。其中,围绕射孔的早期局部径向流阶段是该类井的主要特征。分析了射孔完井参数射孔密度、射孔长度、射孔相位角以及渗透率各向异性等因素对试井理论曲线的影响,为射孔完井设计以及射孔井的试井分析提供理论指导。射孔井的总表皮系数计算结果表明,在一定参数条件下,射孔井可以成为超完善井,深度射孔是提高产量较有效的手段。
Other AbstractPerforated completion is one of the most commonly used completion methods in oil and gas development. The single well productivity is largely determined by the completion method for a given oil-gas well. The well test analysis and single well productivity calculation are normally realized by using a 2-D open hole model, however, this approach may cause large errors. Based on properties of perforated completion and permeability anisotropy of reservoirs, a three-dimensional numerical well test model was proposed to analyze the transient flow in perforated vertical wells. With the model, well test type curves and pressure fields of perforated wells are obtained by using the 3-D finite elemnet method (FEM). Through analyses of well test type curves and the three-dimensional flow in the pressure field, six flow phases can be recognized on well test type curves of perforated wells, i. e. wellbore storage, the first transition, early-time partly radial flow around the perforation, the second transition, late-time system radial flow and boundary-dominated flow. Among them the early-time partly radial flow around the perforation is the most important characteristic of perforated wells. Effects of perforated completion parameters, such as perforation density, length, phase angle and permeability anisotropy, on the transient pressure and derivative responses were studied, which provides theoretical guidance to design perforating types and analyze well test data of perforated wells. The calculation result of the total skin factor of perforated wells showed that the productivity of a perforated well may be higher than that of an open hole if the perforation is long enough or the perforation density is high enough. Increasing the perforation length is an effective way to enhance the productivity of a perforated well.
Keyword射孔井 数值试井 表皮系数 三维有限元 射孔密度 射孔长度 渗透率各向异性
Subject Area岩体力学和土力学
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Indexed ByEI ; CSCD
Language中文
Funding Organization国家重大科技专项"煤层气井生产测试技术"(2011ZX05038-003)资助
CSCD IDCSCD:4949239
DepartmentLMFS水环境流体力学(LEM)
Citation statistics
Cited Times:5[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47398
Collection流固耦合系统力学重点实验室
Corresponding Author刘曰武
Recommended Citation
GB/T 7714
欧阳伟平,刘曰武. 射孔完井参数对试井理论曲线的影响[J]. 石油学报,2013,34(3):528-534.
APA 欧阳伟平,&刘曰武.(2013).射孔完井参数对试井理论曲线的影响.石油学报,34(3),528-534.
MLA 欧阳伟平,et al."射孔完井参数对试井理论曲线的影响".石油学报 34.3(2013):528-534.
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