Simulation And Application On Mechanical Gap Foam Breaking Device For Foam Drilling

The program presented in this paper is a broadly based technology development program directed at improving foam volume breaking device techniques for foam drilling, Specific goals have been set for the program. The problems of foam stability, foaming, are being addressed at present. Foaming processes and foam stability have been conducted during this study, experiments on foaming and foam stability have been done with various foam agents; the affects of chemical and physical parameters on foaming and foam stability are examined and reported; an understanding of the fundamentals of foams behavior and their properties is provided;As well the effects of the concentrations of foam agent, CMC, and bentonite on foaming and foam stability experimentally determined and a new mixture has been introduced; the effect of temperature, hole depth, hole diameter, pipe diameter and pressure have been presented.A development of advanced physical design on mechanical foam volume breaking foam method for foam drilling during drilling operations is presented. Laboratory experiments on foam volume breaking and experiment set-up with a new geometrical design of foam breaking device has been done.Process model is accomplished via the solution of designing the device and simulated by fluent program; simulation and calculation on foam volume breaking with change field pressure by using fluent software computing program which was developed to process the data and closely simulate the pressure and the VOF Model simulation; experimental results are achieved. Simplified symmetrical two dimension model and simulated calculation study by using K-εmodel (2 equations) and steady time on changing air pressure fields inside the bursting foam device is presented. Results of simulated calculation and laboratory experiments have been shown a good agreement with Binary Equation. Foam bubbles expansion and rupture is driven by the different pressures inside the foam bubbles during the fluid circulation which is higher and the ambient pressure inside the foam breaking device which is very low in comparison, on the other hand, performed of different foam fluid velocities through the foam bursting device and increasing of air pressure on the foam fluid flow led to different bursting foam volume bubbles.Decreasing the foam volume during circulation when drilling operation is desirable and will provides less impact on environment in comparison. To confirm the efficiency of the bursting foam device, experiments have been done on different foam agents ABS and SDS; results ranging from 71 to 80% and from 64 to 69.4% respectively are obtained. It is demonstrated that the amount of air volume, pressure and the fluid velocity in the device are the dominant control mechanism for the final result of foam bursting. Calculation of the changing field pressures and the results computed and discussed.The applications on the foam breaking device have been done; where two fields' experiments have been carried out in Inner Mangolia North West of China. The device of foam breaking is connected to the rig during clean the hole with foam materials the depth was up to 430m; foam breaking by device was very good and reach up to 80% results and analysis is tabulated and reported.