| Abstrakt: |
Statistical studies indicate that more than 70% of cementing operations carried out on wells in oil and gas fields are unsuccessful. The reasons for failure are many and varied. The loss circulation of the cement slurry during cementing is one of the most important reasons for this failure. Loss circulation leads to the non-arrival of the cement slurry to the specified height of the annular space. This problem is a frequent occurrence in the fields of the central region in Syria (fields of Abu-Rabah and North Al-Fayd ... etc.), and it leads to great material losses and often hinders the operations of completing the well and putting it into production. Although many methods are used, and studies are conducted to solve this problem, it is still recurring and aggravating. We aim in this research to try to solve the problem of loss circulation of cement slurry during cementing by using texotropic cement slurries, as these fluids form a gelatinous structure immediately after they stop moving in the formation, which gives the cement slurry a period to solidify and close the loss circulation areas. This study shows that adding bentonite at a concentration of 15% (weight) to the cement mixture at w/s = 60-70% leads to form a suitable texotropic cement slurry and adding sodium silicate at a concentration of 6% and at a ratio w/s = 70% gives the cement slurry a gel strength. It helps a lot in solving this problem. The proposed fluids have suitable rheological properties that enable them to be used in the field to carry out cement operations. They also give a cement stone with appropriate insulating properties and mechanical resistance as well. [ABSTRACT FROM AUTHOR] |
