Usage of Geomechanically Consistent Fracture Model for Drilling Deviated Wells

Nikita Vladislavovich Dubinya, S. Tikhotskiy, S. Fomichev, S. Golovin
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Abstract

The paper presents an algorithm for the search of the optimal frilling trajectory for a deviated well which is applicable for development of naturally fractured reservoirs. Criterion for identifying the optimal trajectory is the feature of the current study – optimal trajectory is chosen from the perspective of maximizing the positive effect related to activation of natural fractures in well surrounding rock masses caused by changes of the rocks stress-strain state due to drilling process. Drilling of a deviated well is shown to lead to the process of natural fractures in the vicinity of the well becoming hydraulically conductive due to drilling. The paper investigates the main natural factors – tectonic stresses and fluid pressure – and drilling parameters – drilling trajectory and mud pressure – influencing the number and variety of natural fractures being activated due to drilling process. An algorithm of finding the optimal drilling parameters from the perspective of natural fractures activation is proposed as well. Different theoretical scenarios are considered to formulate the general recommendations on drilling trajectory choice according to estimations of stress state of the reservoir. These estimations can be provided based on results of three- and four-dimensional geomechanical modeling. Such modeling may be completed as well for constructing geomechanically consistent natural fracture model which can be used to optimize drilling trajectories during exploration and development of certain objects. The paper presents a detailed algorithm of constructing such fracture models and deviated wells trajectories optimization. The results presented in the paper and given recommendations may be used to enhance drilling efficiency for reservoirs characterized by considerable contribution of natural fractures into filtration processes.
地质力学一致性裂缝模型在斜井钻井中的应用
本文提出了一种适用于天然裂缝性油藏开发的斜井最优打井轨迹搜索算法。确定最优轨迹的标准是本研究的特点——从钻井过程中岩石应力-应变状态变化对井周围岩体天然裂缝激活的积极作用最大化的角度选择最优轨迹。研究表明,在斜井的钻井过程中,井附近的天然裂缝会因钻井而变得具有导流性。研究了影响钻井过程激活天然裂缝数量和种类的主要自然因素(构造应力和流体压力)和钻井参数(钻井轨迹和泥浆压力)。提出了一种从天然裂缝激活角度寻找最优钻井参数的算法。考虑了不同的理论情景,根据储层应力状态的估计,制定了钻井轨迹选择的一般建议。这些估计可以根据三维和四维地质力学模型的结果提供。这种建模也可以用于构造地质力学上一致的天然裂缝模型,用于某些目标勘探开发过程中的钻井轨迹优化。本文给出了构造此类裂缝模型和斜井轨迹优化的详细算法。本文的研究结果和提出的建议可用于提高天然裂缝对过滤作用有较大贡献的储层的钻井效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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