Comprehensive analysis of casing damage causes: 1.The reasons of casing damage mainly include improper production mode, excessive production pressure and other factors.Blind and rapid mining operation will cause damage to formation structure, resulting in a large amount of formation sand into the wellbore, and then affect the normal production of the oil well.At the same time, serious hole and formation collapse in the near well area will also cause casing fracture or deformation.In addition, when the hole has a certain inclination, there is a collapse hole, poor cementing quality, cement return height difference, etc., the casing will be stretched due to heat during steam injection, and bending will occur under the action of compressive stress. To learn more click on the link below: www.hu-steel.com 2.Improper stimulation and injection can also lead to casing damage.Excessive pressure during high-pressure construction processes, such as fracturing and acidizing, can lead to formation collusion.The intrusion of external water and steam injection cooling water may destroy the original stable cement structure and cement ring outside casing, leading to casing corrosion and reducing its strength.The rock has creep and stress relaxation characteristics. Under the action of expansion caused by external water, when the creep and expansion exceed the compressive strength of the casing, the casing will be compressed and deformed or even broken. 3.Frequent workover operations can also lead to casing damage. In the middle and late period of oilfield production, formation pressure is generally reduced and the leakage is serious. During well washing and sand washing, a large amount of workover fluid enters the formation, causing formation damage and corrosion of casing. 4. If the casing damage is not repaired in time and the production is caused by disease, formation water and injected water will enter the fractured formation, make the formation creep and damage the casing again, resulting in further casing damage. Not only that, but also due to the creep of the formation will damage the casing of the adjacent well, like a plague to form a malignant vine of casing damage. Closing remarks To sum up, there are many factors causing casing damage in the production process of oil and water Wells, mainly including physical factors, chemical factors and human factors, among which the formation factors are physical factors It is the most important factor causing casing damage, and it is also unpredictable and inevitable. Therefore, in the production process of oil field, it is necessary to make an accurate analysis of the causes of casing damage, and select reasonable repair technology according to different damage causes, so as to effectively solve the casing damage problem. At the same time, relevant enterprises should strengthen construction management, do a good job of casing corrosion protection, minimize the risk of casing damage, extend its service life to the maximum extent, and ensure the long-term sustainable development of oilfield enterprises. To learn more click on the link below: www.hu-steel.com