通道压裂中流动通道形态影响因素实验研究

发布时间：2018-01-16 21:13

本文关键词：通道压裂中流动通道形态影响因素实验研究　出处：《油气地质与采收率》2017年05期 　论文类型：期刊论文

【摘要】：通道压裂是低渗透致密油气藏高效、低成本开发的关键技术,其关键是在水力裂缝中形成供油气流动的畅通通道网络,但目前针对通道压裂支撑剂铺置形态、流动通道特征研究尚处于起步阶段。通过大型平板裂缝可视装置,开展通道压裂支撑剂动态输送实验研究,分析纤维、压裂液、支撑剂、泵注排量和脉冲时间对支撑剂输送和流动通道形态的影响。实验结果表明:纤维和压裂液决定能否在支撑裂缝中获得流动通道,而泵注排量和脉冲时间对流动通道形态有较大影响,而支撑剂密度和粒径对流动通道形态几乎无影响;胍胶分子链缠绕在纤维表面,使得纤维网状结构范围增大、强度增强,两者共同提高了携砂液脉冲段在输送过程中的稳定性;流动通道类型可以分为3类,且流动通道形态受到泵注排量和脉冲时间乘积的控制。当脉冲单元注入参数为2.5~5.0 L时,形成的高速通道形态最优,支撑裂缝导流能力最大。
[Abstract]:Channel fracturing is a key technology for the development of high efficiency and low cost oil and gas reservoirs with low permeability. The key point is to form an unblocked channel network for oil and gas flow in hydraulic fractures, but at present, it is aimed at the configuration of channel fracturing proppant. The study of flow channel characteristics is still in its infancy. Through the large plate fracture visual device, the experimental research of channel fracturing proppant dynamic transportation is carried out, and the fiber, fracturing fluid and proppant are analyzed. The effect of pump flow rate and pulse time on proppant transportation and flow channel morphology. The experimental results show that fiber and fracturing fluid determine whether the flow channel can be obtained in the supporting fracture. However, pump discharge and pulse time have great influence on the flow channel morphology, while the density and particle size of proppant have little effect on the flow channel morphology. The molecular chain of guanidine gel is wound on the surface of the fiber, which increases the range of the fiber network structure and the strength of the fiber. Both of them improve the stability of the sand carrying liquid pulse section in the process of transportation. The flow channel type can be divided into three types, and the flow channel configuration is controlled by the pump discharge and pulse time product. When the pulse unit injection parameter is 2.5 渭 L, the high speed channel configuration is optimal. The supporting crack has the largest conductivity.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;
【基金】：国家自然科学基金杰出青年基金项目“低渗致密油气藏压裂酸化”(51525404) 国家科技重大专项“脉冲纤维加砂压裂增产机理及技术研究”(2016ZX05048-004)和“低渗砂岩储层提高压裂裂缝复杂程度工艺技术研究”(2016ZX05006-002) 油气藏地质及开发工程国家重点实验室开放基金“页岩气清水压裂支撑剂沉降动力学行为的CFD-DEM模型研究”(PLN1431)
【分类号】：TE357.1
【正文快照】： 随着油气田勘探开发的深入,低渗透、特低渗透油气藏在整个油气产量中所占的比重越来越大。如美国2015年致密油年产量达2.59×108t/a,占其石油年产量的45%;非常规气年产量达4 500×108m3/a,占其天然气年产量的50%[1]。同样,低渗透油气藏也是中国重要的油气藏类型。新增天然气探

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