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| Theory of strength gradient layer in deepwater weakly consolidated formation and performance of cementing materials |
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BU Yuhuan1,2, DU Jiapei2, LIU Huajie1,2, GUO Shenglai1,2, SHEN Zhonghou2
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(1.Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China)
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| Abstract: |
| A theory of strength gradient layer and a concept of gradient enhance cementing fluid were proposed. By developing a cementing fluid, the cementing fluid is injected into the annulus and the formation at the same time by cementing construction technology, through which the transition zone of strength gradient from annulus to formation near the wellbore is formed, and the cementing quality is improved. The performance of five curing materials were investigated, including cement, resin, alkali-activated slag, alkali-activated MgO, and metakaolin based geopolymer. It is found that resin system displays good mechanical performance, followed by alkali-activated slag. The strength of artificial core is enhanced for 5 to 6 times after the treatment of slag and resin. The bonding strength of cement-formation interface of resin and slag treated samples shows better behavior than other formulas. |
| Key words: deep water weakly consolidated formation strength gradient layer cementing fluid curing materials |
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