中海油田服务股份有限公司 Well Cementing Technology

For decades, COSL has been committing on the cementing technology development and has accomplished solutions for high temperature and high pressure, deepwater, extend reach , ERD, horizontal, low porosity and permeability, ultra deep well, shallow gas, depleted reservoir protection, HTHP lost circulation proof, anti-corrosion, high pressure salts formation, anti-channeling and other complex downhole conditions. To deliver the competitively cementing service flow, COSL has established their core cementing engineering standard, processes, additives, cement slurry systems, cement sheath evaluation instrument and cementing equipment. In the last decades, COSL has accomplished and been identified their long term zonal isolation technologies by efficient solutions and customer recognition in field services.

With over thirty years HTHP well cementing experiences, COSL has developed series of HTHP well cementing technologies through researching and field practices. COSL Cementing delivers reliable zonal isolation within the entire life of well . Providing our customers with satisfied HTHP well cementing solutions.

HTHP oil and gas field exploration and production is more challenging in terms of zonal isolation and cementing slurry system design, as conventional drilling of oil and gas wells are declining.

The key technologies and innovation of high temperature and high pressure well cementing technologies include:

I. HTHP cement slurry system. Series of HTHP cementing additives have been developed which can withstand up to 500℉ of BHST and 23.37ppg of slurry density. It is very stable under high temperature with promising API fluid loss, short transition time, and low porosity of set cement.

III. Anti-channeling, corrosion resistance and stress resistance cement technology. A set cement stress-resilience and damage evaluation equipment was invented, along with additives and c