GN Solids Control mainly manufacture and supply equipment for drilling field
As important part in the drilling process of oil drilling or directional through construction, and the control of its performance parameters is focused on rheology and loss. Mud rheology refers to its flow and deformation under the action of external characteristics, of which the main flow. The loss of mud refers to the size of the loss and the quality of the mud cake formed. Therefore, the mud purification system on mud treatment is good or bad for drilling or crossing construction is very important.
Rheological parameters
In the field of construction, the rheology of mud is usually described by plastic flow pattern, and its parameters generally include viscosity, dynamic shear force, static shear force and thixotropy.
1, Viscosity and dynamic shear force
1) The viscosity of mud has a great influence on the horizontal directional drilling construction. The main changes are as follows: When the viscosity of mud is high, it has strong carrying capacity and good performance of wall protection, so it is hard to leak. However, the increase of viscosity will increase the flow resistance of mud, increase the power consumption, reduce the impact cutting ability of the drill bit, and affect the drilling speed. At the same time its deteriorating purification capacity, increasing pump resistance, affecting the cleaning time. When the viscosity of mud is low, its carrying capacity and protecting performance are worse. Therefore, different viscosity muds should be prepared according to different situations.
2) The dynamic shear force reflects the ability of the mud to form a space grid structure when flowing in the stratosphere. In horizontal directional drilling construction, dynamic shear ratio (the ratio of dynamic and plastic viscosities) is usually used to indicate the shear thinning strength.
2, Static force and thixotropy
The static shear force of slurry reflects the suspended debris carrying capacity of the slurry. The thixotropy refers to the property that the slurry becomes thinner (lower shear force) after stirring and thickens (increases the shear force) after standing. In horizontal directional drilling construction, the mud is usually required to have good thixotropy.
Loss of parameters
1) Loss of mud is an important property of mud and is closely linked to the wall-making properties of the mud, especially when it passes through unfavorable formations such as looseness, fragmentation and water instability.
2) The fluid loss of mud is mainly related to the type of bentonite, degree of hydration and dispersion, density of mudcake and other factors. Slurry filter loss is small, thin and dense mud cake, is conducive to making the wall hole, the mud filter loss, coarse and loose mud cake is not conducive to protecting the hole wall.
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