Test Research And Application Of The Rheology Of Foam Fluid

Because of drilling complicatedness of geological condition, some special stratum conditions must adopt new-type washing liquid, the foam is one kind of new-typly washing liquid. Circulation medium when it utilizes the even and steady foam as the well drilling, It has overcome the shortcoming of the high density of well drilling liquid, overcame the shortcomings of atomization and air well drilling too at the same time, in plateau, desert arid that difficult problem of drilling in the area that lacking of water effective settlement, at the same time because its density is low, in the broken crack development stratum, low-pressure oil gas-bearing formation, have widely application.Although this kind of new technology can be widely used, grasp the research that the foam drilling the systematic theory of the technology too little, the study on rheology rules of the fluid of foam is nothingness, when we drill use foam as washing liquid, we can not control quality, pressure, velocity of the foam, etc. in the well effectively while drilling, influence the superiority of the foam-drilling. So is it key factor of popularize the foam-drilling that advance of our country foam-drilling process of studying the characteristic of the foam rheology.The foam is especial admixture, even mixture that liquid two phase flows, the foam change more series in the course of drilling circulation, its pressure, volume, quality, gravity of foam, viscosity, velocity of flow, flowing type, etc. are in changing constantly in the movement of the foam, so is it study cause heavy difficulty to research the rheology of the foam.In 1928, the physical chemist (Bingham), established U.S.A. rheology institute, start publication " rheology magazine ", rheology has already become a new science. Rheology is studying the fluxion and transmutation of the materials.When Wise researched the flow obstruction of flowing through the iron pipeline of fire control foam, he discovered the foam has no yield value of the Bingham model, thought that the foam is a false plastic fluid completely, its rheology mode is:Logμ＝logτ2＋alog＋bWhether Mitchell use capillary study foam flow, Mitchell utilize follow formula calculate τ y and μ p. Buckingham-Reiners revise Bingham plastic model flowed in pipeline, as follows. Herschell-Buckley model have another name called H-B model, equation form as follows:Rheology equation of broad sense:The equation is to shear rate: In the flow of the annular interspace of the pipeline: thereinto All of the experiment of this thesis utilize the rheology test-bed, it can test the pressure losses relevant datum, and imitate the hole and carry on the test related to rock bits movement.It utilize the rheology test-bed test steady-going foam that formed the diverse of rate of the gas and liquid, pressure, the diameter of pipeline, the density of the foam liquid, find out the change relation pressure losses compared with rate of the gas and liquid, among test pressure, the diameter of pipeline and the density of the foam liquid.Research the rheology of the foam, for guiding the foam-drilling and having very important theory meanings on application of the foam-drilling.We utilize the rheology test-bed that have established can test as follows:1) The pressure losses of the diverse of rate of the gas and liquid, pressure, the diameter of pipeline, the density of the foam liquid; 2) It can used for observing and test debris that flowing in the pipeline, testing debris that return velocity under different conditions (diverse of rate of the gas and liquid in this paper), test the ability of suspending of the foam; 3) Observe the flow state of the foams in diverse of rate of the gas; 4) Measure its shear stress and calculate its viscosity; 5) Measure the pressure loss of the pipeline, simple calculation the pressure loss; 6) Testing the ability of eliminate the foam of the eliminating-foam equipment, in that mending it. Regression and draw the calculate formulae...