基于有限元数值模拟的致密储层体积压裂效果影响参数分析

摘要/Abstract

摘要：

致密储层体积压裂作业后形成复杂裂缝网络,通过改变压裂井附近的渗流场来增大水平井产量,目前针对致密储层体积压裂影响参数对水平井投产后不同时间段压裂效果影响的权重分析较少。通过建立适用于致密油藏油水两相有限元方程对复杂裂缝网络进行有限元数值模拟,采用正交实验与灰色关联法分析水平井体积压裂影响参数在油井投产10年内对产能的影响程度。研究结果表明,裂缝导流能力决定水平井压裂初期产能,裂缝长度决定水平井日产量的递减速度以及后期阶段稳产的产量水平,随着压裂井生产不断进行,裂缝长度取代裂缝导流能力成为影响产量的关键性因素。水平井投产不同时间段内各影响参数对压裂效果的影响程度研究可以为致密储层体积压裂水平井施工设计提供理论支持。

关键词: 致密油藏, 影响参数, 体积压裂, 有限元数值模拟, 复杂裂缝

Abstract:

In general, complex fracture network was formed after SRV fracturing operation in tight reservoirs, and the horizontal well yield was increased by changing the seepage field near the fracturing wells. At present, there was few weight analysis about the influence of SRV fracturing influence parameters of tight reservoirs on fracturing effect at different periods after the production of horizontal wells. By establishing the two-phase finite element equation which was applicable to the tight oil reservoir and water, finite element numerical simulation of complex fracture network was carried out, and the orthogonal experiment and grey correlation method were adopted to analyze the influence degree of horizontal well volume fracturing influence parameters on productivity of oil wells within 10 years. The results showed that the fracture conductivity determines the initial fracturing productivity of horizontal wells, and the fracture length determined the decline rate of daily production of horizontal wells and the level of steady production in the later stage. With the continuous production of fracturing wells, the fracture length replaced the fracture conductivity and became a key factor affecting the yield. The research on the influence degree of each influence parameter on the fracturing effect in different periods in which horizontal wells could provide theoretical support for the construction and design of SRV fracturing horizontal wells in tight reservoirs.

Key words: tight reservoir, influence parameters, volume fracturing, finite element numerical simulation, complex fracture

中图分类号:

TE377

冯福平,雷扬,陈顶峰,胡超洋,王胡振,黄芮. 基于有限元数值模拟的致密储层体积压裂效果影响参数分析[J]. 油气藏评价与开发, 2019, 9(1): 29-33.

Feng Fuping,Lei Yang,Chen Dingfeng,Hu Chaoyang,Wang Huzhen,Huang Rui. Parameter analysis of SRV fracturing effect of tight reservoirs based on finite element numerical simulation[J]. Reservoir Evaluation and Development, 2019, 9(1): 29-33.

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生产时间	日产油量			累积产油量
生产时间	裂缝长度	裂缝密度	裂缝导流能力	裂缝长度	裂缝密度	裂缝导流能力
最大日产量	0.300	0.333	0.367	0.300	0.333	0.367
第一年	0.311	0.330	0.359	0.307	0.326	0.366
第二年	0.335	0.327	0.338	0.320	0.320	0.360
第三年	0.351	0.324	0.325	0.330	0.316	0.354
第四年	0.362	0.325	0.313	0.337	0.313	0.350
第五年	0.371	0.326	0.303	0.341	0.311	0.348
第六年	0.376	0.326	0.298	0.343	0.310	0.347
第七年	0.380	0.325	0.295	0.345	0.309	0.346
第八年	0.382	0.324	0.294	0.346	0.308	0.346
第九年	0.383	0.324	0.294	0.346	0.308	0.345
第十年	0.383	0.323	0.294	0.347	0.308	0.345