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Simulation method of plugging of shale pore-throats by nanoparticles

A technology of nano-particles and simulation methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as numerical simulation or simulation research methods, reports, etc.

Inactive Publication Date: 2015-04-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no relevant numerical simulation or simulation research method report for this type of research.

Method used

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  • Simulation method of plugging of shale pore-throats by nanoparticles
  • Simulation method of plugging of shale pore-throats by nanoparticles
  • Simulation method of plugging of shale pore-throats by nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) Set boundary conditions

[0049] Firstly, five boundaries of AB, BC, CD, DA, and EF are generated, and the five boundaries enclose two spaces with a ratio of 10:5 (simulating the 100nm×200nm space of shale rock mass). as attached figure 1 As shown, the boundary conditions are set to simulate the 100nm×200nm space of shale rock mass, that is, the ABFE area, and EFCD represents the annular space area, which is the active area of ​​nanoparticles; the left space is used as the well wall area (shale simulation area), The space on the right serves as the annular space.

[0050] This case simulates the migration of shale rock layers with a certain porosity and nanoparticles in nanoscale shale pore throats. For the convenience of observation, the model is enlarged by 10 in this case 8 Double to macro vision. Among them, the basic mechanical parameters and initial state of the generated shale rock mass component particles are shown in Table 1.

[0051] Table 1. Basic par...

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Abstract

The invention discloses a simulation method of plugging of shale pore-throats by nanoparticles. According to structural features of shale pores, simulation dimensions and boundary conditions of shale are set; initial conditions of stresses and speeds of the nanoparticles in drilling fluid are set; according to features of the nanoparticles and the drilling fluid, a particle contact and motion model is built; a nanoparticle system and the process of contact, collision, deposition and migration with the particles, on the surface of the shale and in the pores of the shale, are solved by the discrete element method; shale pore plugging condition, plugged layer pore structure and the like are simulated; plugging law and plugging micro-process and mechanism are revealed.

Description

technical field [0001] The invention relates to a simulation research method for plugging shale pore throats by nanoparticles, and belongs to the technical fields of oil drilling and completion well wall anti-instability, reservoir protection, and plugging and anti-leakage technologies. Background technique [0002] The key to drilling shale formations with water-based drilling fluids is to effectively reduce the water phase intrusion of drilling fluids into rock formations, which is a bottleneck technology related to the economic development of shale gas. At present, the strategies and measures taken by drilling fluid to block water and precipitation invasion mainly include the following methods: ①Chemical inhibition method prevents shale water absorption, dehydration and swelling by adding shale inhibitors and anti-swelling agents in drilling fluid; Chemical film-forming agents are added to the drilling fluid to form a layer of non-permeable membrane or selective semi-perm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张锐王瑞和冯玉娇宋琳张田田石先亚
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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