Published February 2013

Increasing of drilling mud inhibition via local construction materials

A.S. Mammadov

The practice in deep oil and gas wells drilling in Azerbaijan shows that various complications occurred while drilling are observed basically in the drilling of unstable argillaceous formation. Under the influence of physical-chemical properties of circulating mud in the well, argillaceous formation bulk up, reduce the well nominal diameter, thus promotes emergence of a series of accidents and complications. It is possible to achieve increasing of argillaceous stability increasing by mud hydration reduction via different superficially-active materials with magnification of inhibited electrolytes and regulation of ion-exchange process of mud alkalinity. From the practice of local and foreign drilling works it is known that well wall stability can be increased due to controlling of potassium or calcium ion quantity in the mud. Thereby, the possibility of raising the quantity of inhibition mud using local construction material was studied. That is why the drywall physical-chemical characteristics, used in construction in Gandja and its effect on drilling mud parameters were researched. The investigation showed that the drywall can be used as a complement regulatory inhibition of mud. Due to increasing the drywall quantity for 4 %, it is possible to raise the amount of calcium in the mud filter up to 1000 mg/l, while the structural-mechanical parameters of solution will be relatively unchanged. Besides, increasing the drywall concentration increases the mud density and it leads to decrease weight of the material used to increase the mud corresponding parameter.