Application of low friction cement slurry in cementing long horizontal section of Tao 2 block,Changqing gasfield
The low density cement slurry system prepared with ordinary lightening materials has some defects such as poor pressure resistance,and the actual density increases after the bottom hole high pressure,and the lightening effect becomes worse.The analysis of horizon-tal cementing in Sulige area shows that the friction of light bead system is obviously higher than that of fly ash system.After evaluation and screening,a low friction cement slurry system with a density of 1.40 g/cm3 and subnanometer silicon as the main reducing material is pre-pared.The density increase value of the system after high pressure is less than 0.04 g/cm3,the system is stable and the Fanning friction coefficient is small.It is used in the cementing of long horizontal section of Tao 2-H well 3 931 m in Changqing gasfield,effectively con-trolling the construction starting pressure value of 18 MPa.When the open hole section is in-creased,the actual construction pressure drops by 5～6 MPa,the theoretical friction pressure is close to the actual,and the cementing quality is qualified,providing a reference basis for the cementing construction of long horizontal section.
low frictionlong horizontal sectionlow density cement slurry systemsub-nanometer silicon
NETL
NSTL
万方数据
维普
