The Influence Law of Shear Rate on the Thickening Time of Cement Slurry
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摘要: 剪切速率对水泥浆稠化时间的影响比较大，确定水泥浆真实的稠化时间能够保障固井安全。引用水泥浆在井眼内和室内稠化试验2种状态下的剪切速率数学模型，根据水泥浆在不同剪切速率下的稠化试验结果（30和80℃），分析剪切速率对水泥浆稠化时间的影响规律。30℃时，在22~652/s的剪切速率范围内，稠化时间偏差超过2 h，剪切速率低时稠化时间短；80℃时，在177~885/s的剪切速率范围内，稠化时间偏差在1 h内，剪切速率高时稠化时间短。研究结果表明，选用150 r/min的转速进行稠化试验，能较好地模拟大多数固井情况下的稠化时间，但对于大直径表层套管固井和小间隙固井，应根据实际情况选用合适的剪切速率进行水泥浆稠化试验，才能模拟固井施工时的稠化时间，确保固井施工的安全。Abstract: Shear rate is an important influence on the thickening time of cement slurry, and the determination of the real thickening time is significant for safety in cementing engineering. By establishing mathematical models for the shear rate of cement slurry under two thickening statuses in the borehole and in the lab, the thickening test was conducted under different shear rates (at 30℃ and 80℃) to identify the influence law of shearing rate on the thickening time of cement slurry. At 30℃, the deviation of thickening time is more than 2 h with shear rate of 22-652/s, and the thickening time is shorter at a low shear rate. At 80℃, the deviation of thickening time is less than 1 h with shear rates of 177-885/s, and the thickening time is shorter at a high shear rate. Research results showed that the thickening test at a rotation speed of 150 r/min could effectively simulate the thickening time in most cementing operations. As for cementing operations involving large-sized surface casing and small annulus, suitable shear rates should be used in accordance with specific conditions to perform thickening tests of cement slurry, so as to determine the thickening time in cementing operations accurately and ensure the safety of cementing operations.
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Keywords:
- cementing /
- shear rate /
- cement slurry /
- thickening time
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