致密油藏多层合采直井稳态产能预测模型及影响因素分析

Steady-state productivity prediction model and analysis of influencing factors for multilayer commingled vertical well in tight oil reservoirs

摘要

致密油藏直井体积压裂后基质区域与裂缝区域之间流体流动行为呈非连续性，应用高斯分布函数对全区域渗透率分布的连续非均匀性进行表征。考虑储层开发过程中动态启动压力梯度和渗透率应力敏感性的影响，修正致密油藏直井单层的平面径向流产能公式，应用半数值半解析方法求解。基于纵向各层生产压差之间的关系，建立致密油藏多层合采直井稳态产能预测模型，分析裂缝半长、合采厚度和层间跨度等开发因素对致密油藏三层合采直井产能的影响。结果表明：致密油藏多层合采体积压裂开发过程中，生产压差与开发因素对三层合采直井产能影响显著。相邻上层的裂缝半长扩大 1.3 倍且相邻下层的裂缝半长缩减 1/1.3 ，三层合采的产能可以提高 15.2% 。合采厚度从上至下逐层递减可获得最优合采产能，增大层间跨度使合采产能减小。该结果为致密油藏多层合采直井产能预测提供支持。

Abstract

In response to the discontinuity of fluid flow between the matrix and fracture regions after vertical well volume fracturing of tight oil reservoirs, the Gaussian distribution function is introduced to characterize the continuous non-uniformity of the region-wide permeability distribution. Considering the comprehensive effects of dynamic threshold pressure gradient and permeability stress sensitivity in reservoir development, the plane radial abortion energy formula of single layer of vertical well in tight oil reservoirs is modified and solved by semi-numerical and semi-analytical method. Based on the relationship between the production pressure difference of each layer in the longitudinal direction, the productivity prediction model of multilayer commingled steady-state production of vertical wells in reservoirs is established, and the influence of actual development factors such as fracture half-length, combined mining thickness and interlayer span on the productivity of three-layers commingled production of vertical wells in tight oil reservoirs is analyzed. The results show that in the process of volume fracturing development of tight multilayer oil reservoirs, the production pressure difference and development factors have a significant impact on the production capacity of three-layer combined production vertical wells. The fracture half-length of the adjacent upper layer is expanded by 1.3 times and the fracture half-length of the adjacent lower layer is reduced by 1/1.3, and the productivity of the three-layer commingled production can be increased by 15.2%. It is suggested that the optimal commingled production capacity can be obtained by gradually reducing the combined mining thickness of the oil layer from top to bottom, and increasing the interlayer span actually weakens the combined mining capacity. The results provide a theoretical basis for productivity prediction of multilayer commingled vertical wells in tight oil reservoirs.

关键词

致密油藏 / 体积压裂 / 多层合采 / 动态启动压力梯度 / 应力敏感性 / 渗透率分布 / 产能预测模型

Key words

tight oil reservoir / volume fracturing / multilayer commingled production / dynamic threshold pressure gradient / stress sensitivity / permeability distribution / productivity prediction model

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基金资助

河南省重点研发与推广专项(232102321143)

东北石油大学基础研究科研能力提升专项(2023JCYJ-01)