There is low formation pressure coefficient and high formation temperature in ludong-wucaiwan area. Gas cut and gas channeling happen seriously during oil and gas well cementing. The existing anti-migration additive h...There is low formation pressure coefficient and high formation temperature in ludong-wucaiwan area. Gas cut and gas channeling happen seriously during oil and gas well cementing. The existing anti-migration additive has only effects on single trait, so it is difficult to meet cementing requirement. According to this situation we could use latex slurry to anti-gas channeling. We have synthesised a set of anti-gas channeling lightweight temperature-resistant latex slurry and formed a new channeling preventing latex slurry through plenty of previous laboratory experiments. Finally the performance of latex slurry on temperature-resistant, anti-gas channeling and the anti-gas channeling of cement paste are studied. The experimental results show that this latex system has strong temperature-resistant and anti-gas channeling, which completely meet the requirement of cementing in this area.展开更多
The weight loss of cement slurry is the main cause of early annular air channeling and accurate experimental evaluation of the law of loss change is the key to achieve compression stability and prevent this undesired ...The weight loss of cement slurry is the main cause of early annular air channeling and accurate experimental evaluation of the law of loss change is the key to achieve compression stability and prevent this undesired phenomenon.Typically,tests on the pressure loss of cement slurry are carried out for temperature smaller than 120°C,and this condition cannot simulate effectively the situation occurring in high temperature wells.For this reason,in this study a series of experimental tests have been conducted considering a larger range of temperatures,different retarders and fluid loss additives.The results show that with an increase in the temperature,the weight loss curve of cement slurry changes from a“two-stage”to a“three-stage”behavior,and the risk of channeling increases accordingly.On increasing the amount of retarder and fluid loss additive,the transition time of cement slurry displays a non-monotonic behavior(it decreases first and then increases).It is found that the optimized retarder and fluid loss additive dosage are 0.2%and 2.5%,respectively.展开更多
为满足高温井固井对防气窜水泥的特殊要求,研制出了一种高温防气窜胶乳水泥浆体系。胶乳由苯乙烯(St)、丁二烯(Bd)、聚乙烯醇等制备而成,具有稳定性好的特点。介绍了胶乳的制备条件,室内评价并分析了胶乳的高温降失水性能、耐温性能以...为满足高温井固井对防气窜水泥的特殊要求,研制出了一种高温防气窜胶乳水泥浆体系。胶乳由苯乙烯(St)、丁二烯(Bd)、聚乙烯醇等制备而成,具有稳定性好的特点。介绍了胶乳的制备条件,室内评价并分析了胶乳的高温降失水性能、耐温性能以及胶乳水泥石的性能。利用美国CHANDLER公司7150型气窜模拟分析仪研究了胶乳水泥浆的防气窜性能。通过用X′Pert Pro X射线衍射仪分析水泥石受不同腐蚀介质腐蚀后的组分变化,研究了胶乳水泥浆的耐腐蚀性能。展开更多
文摘There is low formation pressure coefficient and high formation temperature in ludong-wucaiwan area. Gas cut and gas channeling happen seriously during oil and gas well cementing. The existing anti-migration additive has only effects on single trait, so it is difficult to meet cementing requirement. According to this situation we could use latex slurry to anti-gas channeling. We have synthesised a set of anti-gas channeling lightweight temperature-resistant latex slurry and formed a new channeling preventing latex slurry through plenty of previous laboratory experiments. Finally the performance of latex slurry on temperature-resistant, anti-gas channeling and the anti-gas channeling of cement paste are studied. The experimental results show that this latex system has strong temperature-resistant and anti-gas channeling, which completely meet the requirement of cementing in this area.
基金The authors gratefully acknowledge the research project from“Research and test on optimization of calculation model for cementing engineering of high temperature and high pressure wells”(Grant No.CQCJ-2020-06).
文摘The weight loss of cement slurry is the main cause of early annular air channeling and accurate experimental evaluation of the law of loss change is the key to achieve compression stability and prevent this undesired phenomenon.Typically,tests on the pressure loss of cement slurry are carried out for temperature smaller than 120°C,and this condition cannot simulate effectively the situation occurring in high temperature wells.For this reason,in this study a series of experimental tests have been conducted considering a larger range of temperatures,different retarders and fluid loss additives.The results show that with an increase in the temperature,the weight loss curve of cement slurry changes from a“two-stage”to a“three-stage”behavior,and the risk of channeling increases accordingly.On increasing the amount of retarder and fluid loss additive,the transition time of cement slurry displays a non-monotonic behavior(it decreases first and then increases).It is found that the optimized retarder and fluid loss additive dosage are 0.2%and 2.5%,respectively.
文摘为满足高温井固井对防气窜水泥的特殊要求,研制出了一种高温防气窜胶乳水泥浆体系。胶乳由苯乙烯(St)、丁二烯(Bd)、聚乙烯醇等制备而成,具有稳定性好的特点。介绍了胶乳的制备条件,室内评价并分析了胶乳的高温降失水性能、耐温性能以及胶乳水泥石的性能。利用美国CHANDLER公司7150型气窜模拟分析仪研究了胶乳水泥浆的防气窜性能。通过用X′Pert Pro X射线衍射仪分析水泥石受不同腐蚀介质腐蚀后的组分变化,研究了胶乳水泥浆的耐腐蚀性能。
