The right adrenal vein drains into
These blood vessels supply a network of small aeries within the capsule of the adrenal glands. Venous blood is drained from the glands by the suprarenal veins, usually, one for each gland: The right suprarenal vein drains into the inferior vena cava. ref - semantischolar.org
Right renal vein
Inferior vena cava
Second right lumbar vein
Third right lumbar vein
Abdomen and pelvis