加入基础油井添加剂消泡剂、降滤失剂、分散剂和缓凝剂对油井固井性能的影响

A. Akintola
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引用次数: 1

摘要

研究了RHA对G类水泥浆抗压强度及稠度、流变性能等参数的影响。使用了以下添加剂:水泥浆配制中的稻壳灰(抗压强度)、玉米壳灰(缓凝剂)及其他失流剂、消泡剂、分散剂、缓凝剂和水等液体添加剂。本研究是在实验研究的基础上,以纯G类水泥浆与所有液体添加剂混合为对照,对各种添加剂对水泥浆的效果进行对比分析。在井底循环温度为140℃时,对浆体试样进行的抗压强度试验表明,随着RHA浓度的增加,混凝土强度随着养护时间的延长而增加,抗压强度也开始增加。当水泥掺量为13.01%时,抗压强度最佳。强度随时间增加,抗压强度在24小时内达到最高。采用G类水泥和不同掺量的RHA考虑水泥浆的稠化时间。最终浓缩时间随稻壳灰分的增加而缩短。从40bc到100bc,凝结时间明显减少,从1.87小时(在13.01% RHA下)。在700℃的BHST下,灰分浓度的增加导致浆体塑性粘度(PV)的降低和屈服点的增加。结果表明,使用这种灰配制的浆料粘度在推荐值之内,表明泵送这种浆料是可取的。在124°C和7700psi的井底压力下,随着RHA添加百分比的增加,流体损失量增加,但低于50cp是可以接受的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance Evaluation of Local Material Rice Husk Ash Under Downhole Conditions with the Addition of Basic Oil Well Additives Antifoam, Fluid Loss, Dispersant and Retarder on Oil Well Cementing
The effect of RHA on Compressive Strength as well as other parameters like Consistency and Rheological properties etc. on Class G cement slurry is studied. The following additives were used; Rice Husk Ash (for Compressive Strength), Guinea Corn Husk Ash (Retarder) and other liquid additives which are fluid Loss Additive, Antifoam, Dispersant, Retarder and Water in the formulation of the cement slurry. This research is a comparative analysis based on experimental study on the effectiveness of the various additives on the cement slurry using pure Class G cement slurry combined with all liquid additives as a control. At a Bottomhole Circulating Temperature of 140°C, the Compressive Strength tests carried out on the slurry samples showed that the strength of the concrete increases as the concentration of the RHA increases with time of curing, also the compressive strength started to increase. The best Compressive Strength result was obtained with the percentages of cement replaced by 13.01% RHA. The strength showed impressive increase with time, with highest compressive strength encountered in 24 hours. The Thickening Time of the set Cement Slurry was considered using Class G cement and different percentage of RHA. The final Thickening Time decreases with increase in Rice Husk Ash. Decrease in the setting time was noticeable from 1.87 hrs (at 13.01% RHA) from 40bc to 100 bc. At BHST of 700°C increasing the ash concentration resulted in decrease in the Plastic Viscosities (PV) and increase in the Yield Points of the slurries. The results indicate that the slurries formulated using this ash has viscosities which are within the recommended values showing it is desirable to pump such slurry. For both 124°C and Bottom Hole Pressure of 7700psi the amount of fluid loss increases as the percentage of RHA added increases but it is below 50cp which is acceptable.
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