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- Title
含双温敏单体的耐220 ℃高温降失水剂.
- Authors
李早元; 陈 建; 黄 盛; 杜培伟; 蒋卓颖; 罗 龙
- Abstract
To solve the problem of poor temperature resistance of oil well cement fluid loss additive under high temperature conditions, this study adopted acrylamide (AM), sodium p-styrene sulfonate (SSS), N, N-dimethylacrylamide (DMAA) and N, N-diethylacrylamide (DEAA) as organic synthesis materials through molecular structure design. A fluid loss additive LHF-1L with high temperature resistance was synthesized successfully by aqueous solution free radical polymerization method. The influence of synthetic conditions on the fluid loss reduction performance was discussed comprehensively, and then the chemical characterization and performance evaluation of LHF-1L were carried out. The results showed that the filtration reduction performance of LHF-1L was the best under the preparation condition of 4: 6: 2: 0.5 monomer ratio of AM: SSS: DMAA: DEAA, 0.75% initiator potassium persulfate (KPS) solution in total mass of monomer, 7 pH value of reactant solution, 65 ℃ reaction temperature, 4 hrs reaction time. The water loss at 220 ℃ with LHF-1L dosage of 7% was 42 mL. The test results of FT-IR, TG and GPC showed that all four monomers were successfully involved in the polymerization, and then the target product was generated. Only when the temperature reached 273 ℃, apparent heat loss of LHF-1L appeared. The polydispersity coefficient was 1.396, meanwhile, the average molecular weight was 171 351 g/mol. In addition, LHF-1L had little influence on the development of cement slurry fluidity and cement compressive strength. At 220 ℃, the water loss after adding 7% LHF-1L to the cement slurry could still be controlled within 50 mL. At 150 ℃ and 94.4 MPa, LHF-1L would not cause the slurry to thicken sharply and super retarding. The thickening curve was normal, moreover, no abnormal gelling phenomenon occured. The preparation of LHF-1L by double temperature-sensitive monomer enhanced its thermosensitive hydrophobic association at high temperature, thus improving its fluid loss reduction performance at high temperature, and meeting the requirements of cementing technology at high temperature.
- Publication
Oilfield Chemistry, 2024, Vol 41, Issue 1, p1
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2024.01.001