The Application of Eccentric Mechanical Vibration Cementing Technique in Changqing
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摘要: 为提高长庆油田注水调整更新井固井质量，试验应用了一种偏心机械式振动固井技术。在室内采用ZD-34电动振动器评价装置对振动器进行室内模拟，对水泥浆振动后的抗压强度、胶结强度、稠化时间、初终凝过渡时间和渗透率进行评价，结果表明，振动后水泥浆稠化时间缩短25%~30%，初终凝过渡时间缩短30%~50%，水泥石24h抗压强度提高10%~14%，胶结强度提高11%~16%，渗透率降低33.3%~43.9%。该技术在长庆油田吴堡区块应用5口井，试验井油水层封隔良好，总体固井优质率提升20%以上。室内实验和现场应用表明，偏心机械式振动固井技术可以有效提高固井质量，具有较好的推广应用前景。Abstract: An eccentric mechanical vibration cementing technique was used in Changqing oilfield in an effort to improve the cementing job quality of the injector wells. Cementing slurry was evaluated after vibration on a ZD-34 model electric vibrator as to its compressive strength, bond strength, thickening time, initial setting transition time, final setting transition time, and permeability. The evaluated cement slurry was then used in filed operations. The laboratory study showed that the thickening time of the cement slurry after vibration was reduced by 25%-30%, the initial and the final setting transition time reduced by 30%-50%, the 24 h strength of the set cement increased by 10%-14%, the bond strength increased by 11%-16%, and the permeability reduced by 33.3%-43.9%. This technique has been used in 5 wells in the block Wupu in Changqing oilfield, and the oil zones and water zones in these wells are well separated, with the rate of excellent well cement jobs increased by more than 20%. The laboratory experiments and the field applications all demonstrate that the eccentric mechanical vibration cementing technique can effectively enhance the quality of well cementing, and is prospective in future cementing operations.
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