Optimization on Well Energy Supplement and Cluster Spacing Based Upon Fracture Controlling Fracturing Technology & Reservoir Simulation - An Ordos Basin Case Study

Ying Guo, Dingwei Weng, Xin Wang, Yao-yao Duan, J. Xiu, Zhuxin Chen, Jianwei Liu, M. Tang
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引用次数: 1

Abstract

Unconventional reservoir is characterized by its low permeability, insufficient reservoir energy and low production. To develop unconventional resource economically and efficiently, the industry has been spending tremendous resources to optimize completion, energy supplement and cluster spacing in stimulation technology by piloting – a trial approach. However, this approach tends to be time consuming and cost significant amount of money. As the fracturing modeling and stimulation technology advances, we question: "Can we use the fracturing modeling and reservoir simulation technologies to optimize well energy supplement and cluster spacing based upon Fracture Controlling Fracturing (FCF) technology, which is the latest concept for stimulation technology with successful applications in China's unconventional oil and gas development?", so that the industry can significantly save piloting time and money, and quickly find the optimal energy supplement method and cluster spacing corresponding to optimal completion. Based on the actual geological conditions of the horizontal well group of An83 block in Changqing oilfield in Ordos basin, we first built a 3-D geological and petrophysical model by Petrel and Eclipse softwares, and then calibrated the model with multi-stage fracturing production history data of each well. Local grid refinement and equivalent permeability simulation of fractures were used to optimize the crack system and cluster spacing parameters. FCF is a new generation hydraulic fracturing technology to move all the controllable reserves per well, and develop unconventional resources economically and efficiently by making fractures matching ‘sweet spots’ and ‘non-sweet spots’. The FCF emphasizes on making all the oil and gas movable by the hydraulic fracturing for the first time, the integration of reservoir pressurization, stimulation and production. It aims at moving all the oil and gas in place, developing unconventional oil and gas resources sustainable and profitable. The FCF has been successfully applied to the Ma56 block of Santang Lake in Tuha Oilfield of China. The average cluster spacing is 39.4 ft, and each stage has 5 clusters. The ‘fracture-controlled reserves’ was raised by optimizing well energy replenishment and cluster spacing based upon FCF technology. The total fluid volume injected is 151421.4bbl per well, and the formation energy is fully supplemented. Compared with neighboring wells, the oil production has increased by 1.7 times. With outstanding performance in production enhancement for unconventional oil and gas plays, FCF is worthy of extensive promotion.
基于控缝压裂技术及储层模拟的井能量补充及簇距优化——以鄂尔多斯盆地为例
非常规油藏具有渗透率低、储层能量不足、产量低的特点。为了经济高效地开发非常规油气资源,油气行业已经投入了大量资源,通过试验方法来优化完井、补能和增产技术簇间距。然而,这种方法往往是耗时的,并且要花费大量的金钱。随着压裂建模和增产技术的进步,我们提出了以下问题:“基于裂缝控制压裂(FCF)技术,我们是否可以利用压裂建模和储层模拟技术来优化井能量补充和簇间距? FCF是最新的增产技术概念,在中国非常规油气开发中得到了成功应用。”并快速找到最优补能方式和最优补能所对应的簇间距。根据鄂尔多斯盆地长庆油田安83区块水平井组的实际地质条件,首先利用Petrel和Eclipse软件建立了三维地质岩石物理模型,然后利用每口井的多段压裂生产历史数据对模型进行了标定。采用局部网格细化和裂缝等效渗透率模拟对裂缝系统和裂缝簇间距参数进行优化。FCF是一种新一代水力压裂技术,通过匹配“甜点”和“非甜点”,实现单井所有可控储量的移动,经济高效地开发非常规资源。FCF强调首次实现所有油气的可动性,实现储层增压、增产、生产一体化。它的目标是将所有的石油和天然气转移到位,可持续地、有利可图地开发非常规油气资源。FCF已成功应用于中国吐哈油田三塘湖Ma56区块。平均簇间距为39.4英尺,每级有5个簇。基于FCF技术,通过优化井能量补充和簇间距,提高了“缝控储量”。每口井注入流体总量为151421.4桶,充分补充了地层能量。与邻井相比,产量提高了1.7倍。FCF在非常规油气增产方面表现突出,值得广泛推广。
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