| 裂缝性致密油藏直井体积改造产能评价模型 |
| |
| 引用本文： | 刘雄,田昌炳,万英杰,王方,徐秋枫.裂缝性致密油藏直井体积改造产能评价模型[J].现代地质,2015,29(1):131-137. |
| |
| 作者姓名： | 刘雄 田昌炳 万英杰 王方 徐秋枫 |
| |
| 作者单位： | (1.中国石油勘探开发研究院，北京100083；2.青海油田 采油二厂，青海 海西州816400；
3.中国地质调查局 油气资源调查中心，北京100029) |
| |
| 基金项目： | 国家科技重大专项(2011ZX05016-006)。 |
| |
| 摘 要： | 针对裂缝性致密油藏，基于拉普拉斯变换及Stehfest数值反演, 建立了一种可用于直井体积改造产能评价的半解析两区复合模型，模型内区包含有限条无限导流水力裂缝，外区是经典的Warren-Root双重介质系统. 并分析了导压系数比α、裂缝传导率比β、储容比ω、窜流系数λ以及改造半径reD等参数敏感性，绘制了产量递减图版。结果表明：从产量递减曲线，可以看出体积改造直井产能遵循“L”形递减规律；导压系数比越大，初期产量越高；裂缝传导率比对整个生产周期的产能都有影响，裂缝传导率比越大，单井产量越高，同时还会伴有明显的复合边界流特征；储容比和窜流系数分别影响双重介质基质-裂缝系统窜流发生的程度和时间；内区人工主裂缝条数越多或改造渗透率越大，复合边界流越明显，产能也越高，这说明改造程度与改造体积对产能的增加都很重要，应注意两者的合理优化。矿场实例验证了该模型在裂缝性封闭边界油藏直井多次压裂改造以及裂缝性致密油藏直井体积改造方面的适用性和实用性。
|
| 关 键 词： | 产能评价 裂缝性致密油藏 缝网改造 复合油藏 拉普拉斯变换 Stehfest数值反演 |
Deliverability Evaluation Model of Fracture Network Reconstruction Vertical Well in Fractured Tight Oil Reservoir |
| |
| LIU Xiong,TIAN Chang-bing,WAN Ying-jie,WANG Fang,XU Qiu-feng.Deliverability Evaluation Model of Fracture Network Reconstruction Vertical Well in Fractured Tight Oil Reservoir[J].Geoscience——Journal of Graduate School,China University of Geosciences,2015,29(1):131-137. |
| |
| Authors: | LIU Xiong TIAN Chang-bing WAN Ying-jie WANG Fang XU Qiu-feng |
| |
| Institution: | (1.PetroChina Research Institute of Petroleum Exploration & Development，Beijing100083, China;
2.The Second Oil Producing Plant of Qinghai Oilfield, Haixi State, Qinghai816400, China;
3.Oil and Gas Resources Survey of China Geological Survey, Beijing100029, China) |
| |
| Abstract: | In this study, based on Laplace transformation and Stehfest numerical algorithm, a vertical well fracture network reconstruction semi-analytical deliverability evaluation model which can be used for fractured tight oil reservoirs was established. The proposed model is a composite system with two concentric regions. The inner region contains finite number of hydraulic fractures and the flow in each fracture is assumed linear. The outer region is modeled with the classical Warren Root model and radial flow takes place in this region. The influences of related parameters, such as diffusivity coefficient ratio, fracture conductivity ratio, storativity ratio, cross-flow factor and so forth, on the seepage flow were analyzed by using the established model. The results show that the deliverability follows the “L” shaped decline law. Diffusivity coefficient ratio has effect on initial production. The bigger diffusivity coefficient ratio is, the higher initial production is. Fracture conductivity ratio has great impact on whole production cycle. Storativity ratio and cross-flow factor-influence degree and occurrence time of cross-flow respectively. When artificial fracture numbers or permeability is larger, coupled boundary flow is more obvious and productivity is higher, which shows that reconstruction volume and reconstruction degree both are important to deliverability, we also should pay attention to the reasonable optimization of both parameters. What’s more, two wells’ produce data were fitted, and some reasonable parameters were explained, which can prove the practicability of this model. |
| |
| Keywords: | deliverability evaluation fractured tight oil reservoir fracture network reconstruction composite system Laplace transformation Stehfest numerical algorithm |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《现代地质》浏览原始摘要信息 |
| 点击此处可从《现代地质》下载免费的PDF全文 |
|
