Simulation experiment device for migrating rock cuttings with circulation of deepwater drilling fluid and stabilizing well wall

Abstract

The invention discloses a simulation experiment device for migrating rock cuttings with circulation of deepwater drilling fluid and stabilizing well wall. The device comprises a plurality of simulation wellholes, simulation drill pipes, and a drilling fluid delivering device; simulation well wall is arranged between an upper simulation wellhole and a lower simulation wellhole; the simulation drill pipes are provided with a drilling fluid inflow passage along axial direction; the drilling fluid circular delivering device comprises a drilling fluid circulation loop formed by sequentially connecting fluid storage tank, cooling device, flowmeter, fluid pump, inlet of the drilling fluid inflow passage, outlet of the drilling fluid inflow passage, liquid-solid separator and again the fluid storage tank by pipelines; and the inner wall of the simulation wellholes is provided with a plurality of temperature and pressure sensors, and transmits the signals to a data processor for processing. The invention can simulate the circulation process of deepwater drilling fluid, can carry out property researches such as low temperature flow, rock cutting migrating and well wall stabilizing, and provide an experimental method and research means for deepwater drilling fluid research.

Description

technical field [0001] The invention relates to a deep-water drilling fluid simulation experiment device, in particular to a deep-water drilling fluid circulation rock-carrying and well wall stability simulation experiment device. Background technique [0002] Compared with land drilling or shallow water drilling, there are big differences between deep water drilling, such as low bottom temperature, high pressure, under-compacted formation, multiple layers of casing, and large diameter of riser in deep water. Technical problems and challenges. Therefore, deepwater drilling fluid must have some characteristics: 1. Good rheology at low temperature. As the water depth increases, the seawater temperature is getting lower and lower. The temperature at 3000 meters water depth is only 3-4°C, and in some areas it is even around 0°C. The temperature drop will bring many problems to drilling and oil production operations. Under low temperature conditions, the rheology of the drillin...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that there is no suitable experimental device for the study of the rock-carrying law of the drilling fluid and the stability of the borehole wall in the process of deepwater drilling.

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