The role of thread oil well casing pipe

　　The role of thread oil well casing pipe the passage from oil and gas to the ground, which isolates oil and gas from all strata and ensures that oil and gas pressure does not leak. After the oil and gas wells are put into production, the quality of the casing should be able to maintain a certain production life.

　　On the one hand, the cementing quality of the casing is related to the exploration well and the key of oil and gas testing; on the other hand, it is related to the production well and directly affects the life of the well.

　　The cement plugging height of the gap between the reservoir casing and the well wall shall be at least 500m above the oil and gas reservoir, or 200m up to the previous casing.