Update:
Process of Oil Exploitation:
Exploration of Oil Resource----Well Drilling for Building Oil Well Channel----Well Cementi...
Process of Oil Exploitation:
Exploration of Oil Resource----Well Drilling for Building Oil Well Channel----Well Cementing for Fixing Casing and Injecting Cement Slurry----Well Completion for Connecting Bottom Hole with Oil Layer
Process of Well Cementing
During a drilling operation, casing should be run into the wellbore when a certain depth is reached. Then cement slurry is injected into the annular space between the casing and the wall, during which time a rapid hardening of cement slurry within a specified time is required so as to form a cement sheath of good sealing and isolation performance. The above process is called well cementing. It aims to isolate oil-water-gas layer, support and protect casing, prolong oil-gas well’s working life and increase oil and gas output.
Cementing Additives
Well cementing is an one-off project of high cost, so low cementing quality is hard to be improved once it is completed. What’s worse, low cementing quality can lead to the damage for oil-gas wells and cause huge resources and economy loss. Therefore, it is crucial to ensure a safe cementing operation and high cementing quality. Cementing additives are vital in this process. They can optimize and improve cement slurry system’s performance, which ensures a safe operation, high quality cementing and long oil-gas well’s lifetime under various well conditions and different drilling technologies (eg. directional well and horizontal well).
2.Fluid Loss Additive
A.Fluid loss additive, playing a significant role in a successful cementing, oil-gas well’s lifetime extension and oil output growth, is the most important additive of the largest usage amount in cement slurry design. As is known, excessive fluid loss enhances cement slurry’s density so it is unable to be pumped, and the remaining slurry in the casing will fail the cementing operation. Fluid loss additive can not only effectively control the fluid loss of cement slurry, but also prevent oil and gas layer from being polluted by the filtered fluid and thus increase the recovery efficiency.
3.Retarder
Retarder can effectively prolong the thickening time of cement slurry so as to ensure a successful cementing operation. Generally, bottom hole temperature and pressure will increase with the increasing well depth. While high temperature and pressure can lead to a rapid thickening of cement slurry and thus shorten the pump time, which will cause an unfavorable condition for cementing operation and make cement slurry unable to be pumped for the loss of fluidity, leading to an cementing accident eventually. Therefore, it is necessary to use retarder to prolong cement slurry’s thickening time.
4.Washing Agent
To improve the cement slurry’s displacement efficiency and ensure cementing quality, a certain amount of washing liquid needs to be injected into the casing pipe before cementing. Then the mud cake on the walls can be washed off and thus enhance cementing slurry’s interface binding force.
5.Spacer Additive
In the process of cementing operation, spacer additive can effectively separate drilling fluid from cement slurry and avoid cement slurry being polluted.
If you have interested to learn more, please contact us.
Thanks & Best regards,
Lin Yang(Ms.)
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ZHEJIANG RUICO ADVANCED MATERIALS CO., LTD.(STOCK NO.: 873233)
Wechat: + 86 15268247664
Email: [email protected]
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