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              產品展廳>>項目研發>>低滲-特低滲儲層測試資料解釋方法及綜合評價技術研究

              低滲-特低滲儲層儲集物性變化大,為有效開發,需有多種完井方式,其中射孔、復合射孔及動態負壓射孔,是重要的完井方式之一,導致常規測試技術已不能滿足低滲-特低滲油氣藏評價需求,比如低滲-特低滲儲層常規的測試資料解釋率普遍小于30%,目前常用的試井分析軟件都是基于常規的中高滲透油藏的達西流模型方法,不僅無法考慮啟動壓力梯度、壓敏效應等的影響,也沒有考慮完井方式,這使測試結果誤差較大。為了保證解釋地層壓力、滲透率和表皮因子等試井基本參數的輸出及其準確性,研究多種射孔方式對低滲透油氣藏開發的影響,實現儲層分布特征地精細描述和措施效果地準確預測和評價意義重大,以便制定合理的開發方案。

              針對低滲-特低滲儲層射孔作用機理研究

              從火、炸藥爆炸流場計算研究方面出發,針對低滲-特低滲儲層的特殊巖性,分析火藥爆燃反應速率方程和狀態方程。

              產能優化地層滲流理論研究

              基于低滲-特低滲儲層油氣水滲流方程,結合地層中流體的高壓物性參數,分析地層、孔眼及微裂縫的耦合問題,建立基于射孔孔眼及微裂縫的地層滲流方程。

              射孔工藝及參數選擇優化方法

              通過各類井射孔參數選擇對產能影響的研究分析,根據射孔彈數量和藥量,結合套管結構、水泥環性質、巖石特性及流體影響等,確定井筒安全性;通過優化選擇不同的射孔槍型、彈型、相位、孔密等參數,按照產量或經濟效益提供最優射孔方案;根據最優方案預測地層產能等,為射孔參數優化設計提供理論依據。

              本項目集多個大型計算、實驗修正與現場實用軟件開發為一體,不僅涉及到固體、爆炸及流體三大力學,還涉及到計算數學、并行計算、實驗驗證及軟件開發等學科,是一個需要長期發展與完善的項目。較同類產品,項目已有多年來的射孔研究和在大慶、遼河等油田的射孔實踐,利用已有的計算模型和計算結果,重點開發可現場使用的軟件,同時發展和完善大型計算程序,為射孔工藝設計及產能優化服務。

              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.

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