Coring practice and understanding on well JH-1

According to the problems of hard formation, low coring penetration rate, and high core quality required in Xujiahe zone of Well JH-1, by using long-barreled aluminum inner tube coring technique and optimizing some technical measures such as coring bit and BHA, the problems are successfully resolved during the coring process, and good coring effect is obtained. The paper also introduces some core treatments on surface such as core lifting, Gamma scanning, and labeling. The coring practice and understand of the well has reference value to coring operations in this area.