The main objective of this work is to propose a mathematical model for the differential sticking coefficient of clayey drilling fluids with a lubricant as an additive and evaluate the influence of differential pressure and lubricant content on filter cake thickness and permeability. Tests were carried out on fluids composed of water and 4.86% of active bentonite clay prepared in Hamilton Beach ...

It is very important in the design of a drying system is to evaluate sticking behaviour of the materials goes under drying. A new approach to the sticking issue is applied in this study by carrying out a sticking test for the liquid associated with the materials under study. It was found that the liquid bridge is responsible of the initial sticking of the materials to the contact surface and th...

A state observer design for the inertia wheel pendulum considering static friction of actuated disc is presented. The frictional force modeled by Stribeck effect, with two separate differential equations describing sticking and non-sticking system, respectively. transition between scenarios in general determined a condition. Three proposed observers are designed both model. Depending on probabi...

Modifications to a stochastic differential equation (SDE) approach for modeling single and two phase NAPL flow are proposed which are intended to allow SDE modeling of the motion of air bubbles in porous media. Bubble flow and channeling are discussed along with bubble sticking, bubble coalescing, bubble breakup and air sparging.

Link for citation: Tretyak A.Ya., Litkevich Yu.F., Kruglova T.N. Device and technology of continuous well flushing. Bulletin the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 5, рр.181-188. In Rus. The relevance research is due to fact that at present a large number accidents occur stoppage rotation drill string cessation flushing during build-up string. Staying well...

We consider the rising phenomena which occur in sticking solutions of a two-degree of freedom impact oscillator. We describe a mathematical formulation for modelling such a systems during both free flight and during sticking solutions for each of the masses in the system. Simulations of the sticking solutions are carried out, and rising events are observed when the forcing frequency parameter i...

Periodic sticking motions can occur in vibro-impact systems for certain parameter ranges. When the coefficient of restitution is low (or zero), the range of periodic sticking motions can become large. In this work the dynamics of periodic sticking orbits with both zero and non-zero coefficient of restitution are considered. The dynamics of the periodic orbit is simulated as the forcing frequenc...