High-temperature high-pressure clay cake interface agglutination simulating-estimating device

Abstract

The invention provides a lab device for evaluating the hi-pressure and hi-temperature cementing quality of mud cakes, which essentially comprises a hi-temp and hi-pressure vessel 19, a simulated wellhole 13, an intermediate container 22, a heating and a cooling system, a pressure source and a pressure system, a data acquisition controller 23, a computer 30 and an output equipment 31. The function of the invention is to simulate the in-well pressure and temperature condition, realize such continuous experimental operations as well-hole type filtering of drilling fluid, rinsing and replacing of drilling fluid, injecting of well-solidifying fluid and curing of well-solidifying fluid, etc., simulate and evaluate the impact of in-well drilling fluid and the existing of mud cake on the cementing quality of the interface of the well-solidifying fluid, evaluate the flushing effects of different flushing fluids on circular space, measure the shearing and cementing strength of the interface between the flushing fluid and the circular space, measure the hydraulic cementing strength of the interface between the flushing fluid and the circular space, and provide experimental data for the optimal selection and engineering design for the drilling fluid and well-solidifying fluid in well drilling in oil field.

Description

technical field [0001] The patented invention of this application belongs to petroleum drilling scientific research and production experiment instruments in the field of petroleum exploration and development, and relates to an evaluation instrument for simulating on-site pressure and temperature conditions in a laboratory environment and testing the bonding quality of the first and second interfaces of downhole cementing. Background technique [0002] The cementing quality of oil (gas) wells can be evaluated by the cementation quality of the first interface (cement sheath and casing) and the second interface (cement sheath and formation). The instruments used to measure the cementation quality of oil (gas) well cementing interface at the construction site are large-scale instrument carts and cables, mainly including acoustic amplitude logging, acoustic wave variable density logging, MAK-2 acoustic wave and gamma density logging, etc. method, an instrument cart requires a lar...

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Problems solved by technology

[0003] In order to solve the problem of lack of laboratory simulation evaluation devices for mud cake quality and solidification cementation quality at home and abroad, the present invention proposes a method that can simulate downhole conditions and test indoors: 1. After the cement slurry cementing of oil (gas) wells, the first The shear bond strength of the first interface and the mud cake interface; 2. The hydraulic bond strength of the second interface after cementing the oil (gas) well cement; 3. The experimental evaluation of the flushing and displacement effects of different flushing fluids on the simulated annulus device

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