Development and performance evaluation of high filtration composite plugging agent for oil-based drilling fluids
Oil-based drilling fluid leakage is a serious reduction in the effectiveness of drilling operations,while the oil-based drilling fluid commonly used in a single plugging method,plugging the leakage of a low success rate.In this paper,modified fibre cotton(a mixture of oil-absorbent cotton fibres and antistatic composite fibres),rigid resin,quartz sand+mica(1∶1),and diatomaceous earth are preferred as flexible fibre materials,rigid par-ticles,percolation filler particles,and filter aids,respectively.Through the continuous com-pounding and selection of the four materials,the basic formula of the high filtration compos-ite plugging agent was finally obtained as follows,5%modified fibre cotton(0.5～3.0 mm)+40%rigid resin(200 mesh)+50%percolating filler particles(400 mesh)+5%filter aid(200 mesh).The high filtration composite plugging agent has good suspension stability in oil-based drilling fluid,and the pressure-bearing capacity of 1 mm seam plate is 5 MPa.High filtration composite plugging agent in the blocking effect shows excellent performance,can be quickly lost to form a high-strength blocking plug.High filtration composite plugging agent makes up for the lack of high water loss plugging means and related plugging materials for oil-based drilling fluids,providing a new method for oil-based drilling fluid plugging.
万方数据
维普
