Description of Fluid Flow Characteristics for Fracture-cave Carbonate Reservoirs

doi:10.11885/j.issn.1674-5086.2022.04.22.02

Abstract

Abstract: Many scholars believe that the seepage theory can not describe the fluid flow in fracture-vuggy carbonate reservoirs in Tarim Basin which have complex flow and are different in pore scale and pipe flow theory can solve the problem. In order to clarify this problem, the relationship between pipe flow and seepage is studied from three aspects: the concept of pipe flow and seepage, single-phase flow characteristics and mathematical characterization methods, oil-water two-phase flow characteristics and mathematical characterization methods. On this basis, the feasibility of using pipe flow equation to describe fluid flow in fracture-vuggy reservoirs is analyzed, and the characterization methods of fluid flow in fracture-vuggy reservoirs are discussed. The results show that, the seepage can be regarded as small-scale complex pipeline flow; In case of single-phase flow, there are two flow patterns in pipe flow: laminar flow and turbulent flow, and there are also two flow patterns in seepage flow: laminar flow and turbulent flow. The equations describing pipe flow and seepage flow are unified, while the equations describing turbulent flow are inconsistent, but both consider the influence of inertial force. In two-phase flow, there are many flow patterns in pipe flow. The seepage flow is small in scale and simple in flow pattern. Different characterization models are established for pipe flow according to flow patterns, and relative permeability curve is used to solve the two phase flow problem in seepage flow. It shows that there is no“conflict” between pipe flow and seepage flow. Seepage flow is small-scale complex pipe flow, but due to different disciplines and different research objects, different characterization methods are used for fluid flow. Restricted by the accuracy of reservoir description and the scope of research, the existing pipe flow description methods are not suitable for describing fluid flow in fracture-vuggy reservoirs. The characterization of fluid flow in fracture-vuggy reservoirs should be solved within the framework of seepage mechanics, with reference to the description method of pipe flow.

Key words: pipe flow, seepage, continuum hypothesis, fluid flow characterization, fracture-vuggy reservoirs

CLC Number:

TE344

ZHENG Songqing, WANG Qiang, ZHANG Shiliang, YUAN Feiyu. Description of Fluid Flow Characteristics for Fracture-cave Carbonate Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(5): 124-131.

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