Micro-bubbles size, rheological and filtration characteristics of Colloidal Gas Aphron (CGA) drilling fluids for high temperature well: Role of attapulgite
Micro-bubbles size, rheological and filtration characteristics of Colloidal Gas Aphron (CGA) drilling fluids for high temperature well: Role of attapulgite
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高温井胶体气体泡沫（CGA）钻井液的微泡尺寸、流变和过滤特性：凹凸棒石的作用
DOI：
10.1016/j.petrol.2019.106683
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发表时间：
2020-03
影响因子：
--
通讯作者：
Guomin Li
中科院分区：
文献类型：
--
作者：
Wenxi Zhu;Xinhua Zheng;Guomin Li
胶体气体Aphron钻井液已成功地应用于石油工业中的低压地层和枯竭油层的钻井。随着钻井深度和地层温度的增加，CGA钻井液的高温特性受到越来越多的关注，但对其研究较少。本文选用高温性能较好的凹凸棒石制备CGA钻井液，研究了在25 °C/90 °C/120 °C/150 °C/180 °C条件下的气泡尺寸分布、流变性和滤失性能。制备含黄原胶和3%膨润土的CGA液，作为对照组。结果表明：1)凹凸棒石的加入显著减小了CGA流体的平均直径，改善了CGA流体的气泡尺寸分布，有利于CGA流体的稳定性；2)凹凸棒石有效地提高了CGA流体的常温低剪切粘度，有利于携岩和封堵。幂定律模型是描述凹凸棒石基CGA钻井液流变性的最佳模型。幂定律模型的流变性参数表明，所测试的钻井液在所有温度下都具有剪切稀化行为，通过调整凹凸棒石的加入量可以将流动行为指数控制在合适的范围内；3)凹凸棒石大大降低了CGA钻井液的滤失量，特别是在高温下。凹凸棒石基CGA钻井液可在120 °C下保持可接受的滤失量(在15 m L以内)，在150/180 °C下，3%凹凸棒石的滤失量最低，与3%膨润土相比降低了46.7%/25%。此外，还对凹凸棒石基CGA降滤失机理进行了研究，认为凹凸棒石与凹凸棒石组成的“嵌入型”泥饼结构。
Colloidal Gas Aphron drilling fluids have been successfully applied in petroleum industry to drill low pressure formations and depleted reservoirs. As the increase of drilling depth and reservoir temperature, characteristics of CGA drilling fluids at high temperature are more concerned, yet less investigated. In this paper, attapulgite with better performance at high temperatures was selected to prepare CGA drilling fluids and the bubbles size distribution, rheological and fluid loss performance at 25 °C/90 °C/120 °C/150 °C/180 °C were studied. CGA fluid with Xanthan gum and 3% bentonite were prepared and tested as control group. Result indicates that: 1) The addition of attapulgite significantly reduces the average diameter of aphrons and improves the bubble size distribution of CGA fluids, which is conducive to the stability of CGA fluids; 2) Attapulgite effectively increases low shear rate viscosity (LSRV) of CGA fluid at room temperature, which will help to carry cuttings and seal formation. Power law model is the optimal model to describe the rheological behaviors of attapulgite-based CGA drilling fluids. Rheological parameters of Power law model show that the tested fluids have a shear thinning behavior at all temperatures and the flow behavior index can be controlled to an appropriate range by adjusting the amount of attapulgite; 3) Attapulgite greatly reduces the fluid loss of CGA drilling fluid, especially at high temperature. The attapulgite-based CGA drilling fluids can maintain an acceptable fluid loss (within 15 mL) for drilling operations at 120 °C. At 150/180 °C, 3% attapulgite exhibited the lowest fluid loss volume, which is reduced by 46.7%/25% as compared to 3% bentonite. In addition, the mechanism of attapulgite-based CGA fluid loss control was studied and can be concluded as the “embedded” mud cake structure composed by aphrons and attapulgite.
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DOI：
10.2118/81082-ms
发表时间：
2003
期刊：
--
影响因子：
--
作者：
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通讯作者：
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影响因子：
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影响因子：
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通讯作者：
Sharma, VP
DOI：
10.2118/165114-ms
发表时间：
2013-06
期刊：
--
影响因子：
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影响因子：
1
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