The first trial of ultra-low density cement slurry in Bohai Drilling was successful

2024-11-13

On November 8th, it was learned from Bohai Drilling Company that the company's self-developed 1.25 gram per cubic meter ultra-low density cement slurry system was successfully tested for the first time in the Ning72-81X well of the "ballast stone" project in Huabei Oilfield, and the cement slurry returned to the surface. According to electrical testing interpretation, the cementing quality is qualified, breaking the record for the lowest cement slurry density in Huabei Oilfield cementing.

The Ning 72-81X well is a development well deployed in the Suning block of Huabei Oilfield, with a total drilling depth of 3899 meters. Due to the weak pressure bearing capacity of the formation in this well, drilling fluid with a density of 1.25 to 1.26 grams per cubic meter is required to complete the drilling. In order to ensure that the cementing slurry can be sealed for more than 3000 meters at once and returned to the surface, Bohai Drilling actively organized technical experts to carry out cementing technology discussions, and determined to adopt a technical solution that the density of the cement slurry in the upper wellbore section is not higher than the density of the actual drilling fluid. While ensuring pressure stability, the maximum reduction of liquid column pressure is achieved, laying the foundation for this cementing construction. During the construction period, the on-site construction personnel of Bohai Drilling strictly controlled the construction details and successfully completed various cementing construction indicators. This marks the successful testing of the company's self-developed ultra-low density cement slurry system, providing a new solution for cementing long sealing sections in easily lost formations in various markets in the future.

Next: Great Wall Drilling breaks the record for one drilling of deep coalbed methane horizontal wells in China