Numerical simulation method for real-time quantitative characterization of rock pores blocked by fibers
A numerical simulation and fiber technology, applied in the field of numerical simulation, can solve the problems of plugging rock pores and unable to quantitatively characterize fibers in real time, achieving the effects of low cost consumption, wide adjustment and variation range, and accurate calculation results
Pending Publication Date: 2021-11-26
CHINA UNIV OF GEOSCIENCES (WUHAN)
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[0009] The present invention aims to provide a numerical simulation method for real-time quantitative characterization of fiber-plugged rock pores, which solves the problem that existing drilling fluid tests containing fiber materials cannot quantitatively characterize fiber-plugged rock pores in real time. A variety of fiber parameters to simulate and calculate the plugging effect of fibers on rock pores
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[0078] The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and the accompanying drawings. The concept of the present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0079] like Figure 1 to Figure 6 , is a numerical simulation method for real-time quantitative characterization of fiber-plugged rock pores. The numerical simulation method includes the following characteristics:
[0080] (1) With the drilling fluid as the liquid phase and the fiber as the solid phase, the fiber bends and deforms as the drilling fluid flows, and the CFD-DEM coupling method is used to simulate and calculate the plugging of the pores in the drilling fluid to the horizontal and vertical wells Effect (there is no accurate definition of the pore plugging effe...
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The invention discloses a numerical simulation method for real-time quantitative characterization of rock pores blocked by fibers, which comprises the following steps that drilling fluid serves as a liquid phase, fiber serves as a solid phase, the fiber flows along with the drilling fluid, and the plugging of the pores by the fiber in the drilling fluid is simulated based on a CFD-DEM coupling method, in the simulation process, a fiber geometric model, a fiber stress model and a fiber bending unit are set, the fiber geometric model is a plurality of spherical cylinders connected in sequence, and the fiber stress model comprises a fiber normal contact force model, a tangential contact force model, a normal adhesion contact force model, and a flow resistance model generated by fibers under the action of viscous force of drilling fluid; the fiber bending unit is composed of two adjacent ball cylinders, and when a fiber interacts with drilling fluid or another fiber to be bent and deformed, the centers of the spherical surfaces of the two adjacent ball cylinders generate displacement, and the axes of the cylindrical surfaces of the two adjacent ball cylinders generate angular displacement. According to the invention, the plugging process and the plugging effect of the fiber material on the rock pores can be quantitatively represented in real time.
Description
technical field [0001] The invention relates to a numerical simulation method, in particular to a numerical simulation method for drilling fluid containing fiber material used for plugging rock pores. Background technique [0002] In the process of exploration and development of shale gas and deep geological drilling, maintaining wellbore stability is inseparable from drilling and drilling fluid. Maintaining the well pressure higher than the pore pressure (but not higher than the fracture pressure) is a reasonable and safe mining method for deep geological drilling and ocean drilling. Under these conditions, water-based drilling fluid will inevitably invade rock pores. [0003] To solve the above problems, it is necessary to reduce the degree of drilling fluid invasion as much as possible while maintaining the stability of the borehole wall. Adding fiber materials to plug rock pores is one of the effective methods to enhance the stability of wellbore walls. Due to the adv...
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IPC IPC(8): G06F30/20G06F111/10G06F119/02
CPCG06F30/20G06F2111/10G06F2119/02
Inventor 杨现禹蒋国盛蔡记华代钊恺魏朝晖薛曼李智李子硕
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)