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CMC For Oil Drilling The Applicable Conditions
May 18, 2017

  CMC For Oil Drilling According to the applicable conditions, the mud can be divided into: ① for the sand layer, gravel layer, broken zone and other mechanical dispersion of the mud, referred to as loose layer of mud; ② for soil, mudstone, shale and other water sensitivity The formation of the inhibitory mud, referred to as water-sensitive inhibitory mud; ③ for rock salt, potassium, trona and other water-soluble layer of mud, referred to as water-soluble mud; ④ for more stable, less loss of hard rock drilling Of the mud, referred to as hard rock drilling mud; ⑤ for abnormal low pressure or abnormal high pressure formation of low specific gravity mud or heavier mud; ⑥ for ultra-deep wells, geothermal wells and other high temperature conditions of high temperature mud.

    CMC For Oil Drilling The basic liquid used to prepare the slurry is water or oil. If the mud in the water dispersed in the formation of mud that is water as a continuous phase of the mud is called water-based mud; if the clay in the oil dispersion of the formation of mud that is the continuous phase of the mud slurry is called oil-based mud. Most of the drilling occasions, the use of low cost, easy preparation of water-based mud. Oil-based mud in some specific circumstances, it is divided into water-in-oil emulsion mud and oil-based mud two types, the former oil-water ratio between 50 to 80 and 50 to 20, the latter water content of not more than 5%.

    From the point of view of the dispersion of the clay in the mud, the water-based mud can be divided into finely divided fresh water slurry, coarse dispersed inhibitory mud and non-dispersed low solid slurry.

    CMC For Oil Drilling The finely divided wet mud is obtained by the high degree of dispersion of clay in the water, which is the early type of mud. The salt content of the slurry is less than 1%, the calcium content is less than 120PPM, and the inhibitory polymer is not contained. Its composition in addition to clay, sodium carbonate and water, in order to meet the drilling needs, often also added loss of water and anti-flocculant (thinner). Depending on the treatment agent, there may be iron-chromium salt slurry, lignin sulfonate slurry and humic acid mud. Although such muds are significantly defective in terms of stability, fluidity and formation inhibition, they are often used in drilling conditions that increase mud viscosity.

    CMC For Oil Drilling The coarse dispersion inhibitory mud is formed on the basis of fine dispersion slurry, adding inorganic coalescing agent, making the clay particles thicker and adding organic gluant treatment agent. It has the inhibitory effect on the dispersion of the borehole rock and soil, its own anti-invasion ability is strong and the performance is stable, the flowability is good and the drilling efficiency is high, and it is widely used in the drilling engineering. This kind of mud salt or calcium content is higher, specifically divided into calcium treatment mud (calcium content greater than 120MG / L, such as lime mud, gypsum mud, calcium chloride slurry), salt water slurry (salt content greater than 1 %, Such as saline mud, seawater mud, saturated brine slurry) and potassium-based mud (KCl content greater than 1%).