| 张 锋.新疆低渗透储层压后返排制度优化研究[J].地质与勘探,2019,55(2):622-629 |
| 新疆低渗透储层压后返排制度优化研究 |
| Optimization of the fracturing fluid flowback system in tight reservoirs of Xinjiang |
| 投稿时间：2018-06-04 修订日期：2019-03-01 |
| DOI：10.12134/j.dzykt.2019.02.017 |
| 中文关键词: 压裂 返排 支撑剂回流 数学模型 优化制度 |
| 英文关键词: fracturing, flowback, proppant backflow, mathematical model, optimization system |
| 基金项目: |
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| 摘要点击次数: 1329 |
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| 中文摘要: |
| 压后返排作为压后管理重要的组成部分已经得到了压裂工程师广泛的关注，特别对于低渗透储层而言，如不能及时的返排出储层中的压裂液，压裂液将会进入储层深部，对储层产生二次伤害。但如果返排速度过快，又会导致支撑剂发生回流，降低压裂效果，严重的会导致井筒及井口装置的破坏。因此，低渗透储层返排控制一个重要的关键技术就是优化合理的返排流速。返排见气前，本文基于物质平衡原理，利用渗流力学和工程流体力学理论，建立了支撑剂回流及裂缝闭合时间计算模型，得到了不同时刻井口压力与最佳油嘴匹配关系图。当返排见气后，研究并分析了见气后油嘴变大的原因，给出了具体的油嘴制定方法。以新疆低渗透储层X井为例，制定了返排优化方案，取得了较好的返排效果，该方法对同类储层具有一定的借鉴作用。 |
| 英文摘要: |
| Fracturing fluid flowback is an important part in post-fracturing management, and has been widely concerned by fracturing engineers. Especially for tight reservoirs, if fracturing fluid cannot be discharged in time, fracturing fluid will enter into reservoirs, resulting in secondary?reservoir damage. However, if the speed of fracturing fluid flowback is too fast, it will cause the proppant to backflow and reduce the fracturing effect, even leading to the destruction of the shaft and wellhead. Therefore, controlling a reasonable flowback speed is of vital importance for the tight reservoir’s flowback system. Based on material balance principle, using hydrodynamics theory and engineering fluid mechanics, this work establishes a model for time of fracture closure and critical speed of proppant flowback, and the relationship?between wellhead pressure and optimized choke diameter under different time before gas occurs. The reason of a bigger choke used after gas occurs is studied and detailed calculation methods of choke diameters are provided. Taking an X well in Xinjiang’s tight reservoirs as an example, the optimization of the flowback system is formulated, and a good flowback result is achieved. This method can shed light to similar reservoirs. |
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