The Plant for the Determination of Rheological Characteristics and Regime of Drilling Solutions' Flow

摘要

It is necessary the complex of special means for the realization of wells' drilling process. The most significant component of this complex is drilling solution, which takes out the drilled rock from the well, cools the bit, revolves the turbodrill and carries out a number of another functions-hydrodynamic, hydrostatic, physical-chemical, crust-forming and so on. The distinctive peculiarity of drilling solutions is their aggregate state. Usually, liquid is unable to effect the functions of drilling solutions because it flows and doesn't fit for the crust-formation, I.e. will pass through the walls of the well into the bed. Only the dispersed systems, which consist of small fractions suspended in liquid, possess the properties of the drilling solution. These fractions must be of sufficiently small sizes under this condition, because their content in liquid has not to prevent the work of mud pumps and other equipment. On all the stages of preparation, usage and storage of the drilling solution its properties as of the dispersed system are changing under the influence of various factors. Therefore, it appears the necessity in their regulation, which in its own turn presumes the presence of the quantative information about its rheological characteristics. It is worked out and offered the new viscosimetric plant for the obtaining of such information. In real conditions of exploitation it provides: a) automatic digital measurement of the main rheological parameters of the drilling solution-structural viscosity and dynamic shifting strain; b) automatic calculation of the additional coefficient γ in microprocessor's block of device. This coefficient is characterizing the regime of solution's movement in the bore-hole, which is turbulent (γ > 1), structural (γ < 1) or bordering in unstable condition of the hydraulic system (γ=1). It is brought foreward the structural scheme of this plant and described the principle of its operation. The technical characteristic is given as well.