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产品展厅>>研发&服务>>低渗-特低渗储层测试资料解释方法及综合评价技术研究

低渗-特低渗储层储集物性变化大,为有效开发,需有多种完井方式,其中射孔、复合射孔及动态负压射孔,是重要的完井方式之一,导致常规测试技术已不能满足低渗-特低渗油气藏评价需求,比如低渗-特低渗储层常规的测试资料解释率普遍小于30%,目前常用的试井分析软件都是基于常规的中高渗透油藏的达西流模型方法,不仅无法考虑启动压力梯度、压敏效应等的影响,也没有考虑完井方式,这使测试结果误差较大。为了保证解释地层压力、渗透率和表皮因子等试井基本参数的输出及其准确性,研究多种射孔方式对低渗透油气藏开发的影响,实现储层分布特征地精细描述和措施效果地准确预测和评价意义重大,以便制定合理的开发方案。

针对低渗-特低渗储层射孔作用机理研究

从火、炸药爆炸流场计算研究方面出发,针对低渗-特低渗储层的特殊岩性,分析火药爆燃反应速率方程和状态方程。

产能优化地层渗流理论研究

基于低渗-特低渗储层油气水渗流方程,结合地层中流体的高压物性参数,分析地层、孔眼及微裂缝的耦合问题,建立基于射孔孔眼及微裂缝的地层渗流方程。

射孔工艺及参数选择优化方法

通过各类井射孔参数选择对产能影响的研究分析,根据射孔弹数量和药量,结合套管结构、水泥环性质、岩石特性及流体影响等,确定井筒安全性;通过优化选择不同的射孔枪型、弹型、相位、孔密等参数,按照产量或经济效益提供最优射孔方案;根据最优方案预测地层产能等,为射孔参数优化设计提供理论依据。

本项目集多个大型计算、实验修正与现场实用软件开发为一体,不仅涉及到固体、爆炸及流体三大力学,还涉及到计算数学、并行计算、实验验证及软件开发等学科,是一个需要长期发展与完善的项目。较同类产品,项目已有多年来的射孔研究和在大庆、辽河等油田的射孔实践,利用已有的计算模型和计算结果,重点开发可现场使用的软件,同时发展和完善大型计算程序,为射孔工艺设计及产能优化服务。

Products>>Project Development>>Low/ultralow Permeability Reservoir Formation Well Testing Data Interpretation Methods and Research on Comprehensive Evaluation  Technology

The reservoir physical properties of low/ultralow permeability reservoir formation vary largely, in order to develop effectively, many well completion methods are required, among which perforation, compound perforation and dynamic negative pressure perforation are the most important well completion methods. The conventional testing technology can no longer satisfy the evaluation of low permeability and ultralow permeability reservoirs, such as the interpretation rate of conventional test data of low permeability and ultralow permeability reservoirs is generally less than 30%. At present, the commonly used well testing analysis software is based on the conventional Darcy flow model method of medium and high permeability reservoirs, the influence of starting pressure gradient, pressure sensitivity effect and the completion mode are not include in, which makes the error of test results large. In order to ensure the output and accuracy of the basic parameters such as formation pressure, permeability and skin factor, it is of great significance to study the influence of various perforation methods on the development of low permeability reservoirs, to realize the fine description of reservoir distribution characteristics and to accurately predict and evaluate the effect of measures, so as to formulate a reasonable development scheme.

Study on perforation mechanism of low permeability and ultralow  permeability reservoirs

Based on the calculation of explosion flow field of fire and explosive, the explosive deflagration reaction rate equation and equation of state are analyzed for the special lithology of low permeability and ultralow permeability reservoirs.

Study on formation production optimization seepage theory

Based on the seepage equation of oil gas and water in low permeability and ultralow permeability reservoirs, combined with the high pressure physical parameters of fluid in the formation, the coupling problems of formation, hole and microfracture are analyzed, and the formation seepage equation based on perforation and micro fracture is established.

Perforation technology and parameter selection optimization method

Through the research and analysis of the influence of perforation parameter selection on productivity, according to the number and dosage of perforation bullet, combined with casing structure, cement ring properties, rock characteristics and fluid influence, the safety of wellbore is determined, and the optimal perforation scheme is provided according to the production or economic benefit by optimizing the parameters such as perforation gun type, bullet type, phase, pore density and so on. According to the optimal scheme, the formation productivity is predicted, which provides a theoretical basis for the optimal design of perforation parameters.

This project integrates many large-scale computing, experimental correction and field practical software development, involving not only solid, explosion and fluid mechanics, but also computational mathematics, parallel computing, experimental verification and software development. It is a project that needs long-term development and improvement. Compared with other software, our software has been used in Daqing, Liaohe and other oilfields for many years, by using the existing calculation model and calculation results, the software that can be used in the field is developed, and the large-scale calculation program is developed and perfected at the same time, which serves for perforation process design and productivity optimization.