Joint recycling of drilling sludge and phosphogypsum with obtaining a building material is environmentally appropriate and cost-effective. as it helps not only to prevent environmental pollution. but also to solve the problem of rational nature management. Drilling sludge is a waste formed during drilling oil wells. https://www.roneverhart.com/Neumann-KK-205-Supercardioid-Capsule-Head-Black-008654-p29875/