1. Improve the accuracy of pressure test: when the casing length is greater than 244.5, the casing wall deformation will be more obvious and the accuracy of pressure test results will be higher.

2. Preventing gas leakage: When the casing length is greater than 244.5, the cement slurry between the casing and the formation has a good plugging effect, which can effectively prevent gas leakage and ensure the normal production of the oilfield.

3. Protecting the wellbore: When the casing length is greater than 244.5, the casing has a good protective effect on the wellbore, which can effectively reduce the possibility of wellbore damage.

4. Improve the cementing quality: When the casing length is greater than 244.5, the cementing construction quality and effect will be better, which can effectively improve the development efficiency and production efficiency of the oilfield.