赵丽,郝东奎,姚海晶
ZHAO Li; et al. ( Downhole Servicing Company of Daqing Oilfield Company Ltd. Daqing 163453; China);

• 1:大庆油田有限责任公司井下作业分公司
• 2:大庆油田有限责任公司井下作业分公司
• 3:大庆油田有限责任公司井下作业分公司 黑龙江大庆 163453
• 4:黑龙江大庆 163453

摘要(Abstract)：

5(1/2)套管取换套作业造成的井径较大,井壁与套管间的间隙在90mm左右,导致因井顶替效率低,固井质量无法保证。针对这一状况,从顶替流态、顶替压力、临界排量及流体特性等几方面进行了研究,最终确定用低密度水泥浆作为紊流隔离液,并确定了现场施工方案。同时,为提高水泥环凝固速度、增大膨胀率,对水泥外加剂及其用量进行测试、筛选,研制出国井水泥浆体系配方。现场施工结果证明:该工艺的应用使平均水泥胶结指数提高了32％,有效保证固井质量。
At present, 5 1/2" casing withdrawal and replacement operation often leads to a large hole diameter and 90mm of clearance between wall and casing, which brings about a lower displacement efficiency and an uncertain cementing quality. For this reason , many more studies have been made, including displacement fluid flow, displacement pressure, critical pumping rate and fluid characteristics etc, and low density slurry is finally determined to be a turbulent spacer pad. An in-situ treatment program has also been developed. Furthermore, in order to reduce cement sheath setting time and increase the expansion ratio, cement additions have been tested and selected and a new cement formula has been developed. The field result indicates that the average cement bond index was increased by 32% and the cementing quality was improved.

关键词(KeyWords)： 固井;顶替效率;紊流临界排量;顶替压力;固井水泥浆体系;水泥胶结指数
cementing; displacement efficiency; critical turbu- lence pumping rate; displacement pressure; cement slurry system; cement bond index

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 赵丽,郝东奎,姚海晶
ZHAO Li; et al. ( Downhole Servicing Company of Daqing Oilfield Company Ltd. Daqing 163453; China);

参考文献(References)：

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