OPTIMIZING THE RHEOLOGICAL PROPERTIES OF WATER-BASED DRILLING FLUID USING CLAYS AND NANOPARTICLES FOR DRILLING HORIZONTAL AND MULTI-LATERAL WELLS
OPTIMIZING THE RHEOLOGICAL PROPERTIES OF WATER-BASED DRILLING FLUID USING CLAYS AND NANOPARTICLES FOR DRILLING HORIZONTAL AND MULTI-LATERAL WELLS
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DOI：
10.3933/applrheol-28-43606
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发表时间：
2018-01-01
期刊：
影响因子：
1.8
通讯作者：
Mahmoud, Mohamed
中科院分区：
文献类型：
--
作者：
Elkatatny, Salaheldin;Kamal, Muhammad Shahzad;Mahmoud, Mohamed
钻井液是钻井作业的重要组成部分。钻井液的凝胶强度特性对多边和长水平油藏段的钻井至关重要。失去凝胶强度会使钻屑堆积，导致钻柱卡钻。解决这个问题需要很长时间，并且增加了钻井作业的总成本。本文的目的是：(1)确定碳酸钙水基钻井液在广泛温度范围内的流变特性，(2)评估添加纳米粘土、膨润土和纳米二氧化硅对当前碳酸钙水基钻井液配方相关的凝胶强度问题的影响，以及(3)优化钻井液中膨润土、纳米二氧化硅和纳米粘土的浓度。膨润土、纳米粘土和纳米二氧化硅的浓度从1 wt%到10 wt%不等。流变性能结果证实，当温度升高到200华氏度（93.33摄氏度）时，碳酸钙水基钻井液的凝胶强度达到零Ib/100英尺(2)。通过添加不同浓度的膨润土、纳米粘土和纳米二氧化硅来解决这个问题。在低膨润土浓度（3.33 wt%）下，凝胶强度仍随时间降低。在高膨润土浓度（10 wt%）下，凝胶强度随时间增加。膨润土的最佳浓度为6.66 wt%，这产生了一个平坦的凝胶强度流变谱。结果表明，膨润土对水基钻井液的流变性能进行了优化。同样，7.5 wt%的纳米二氧化硅表现出最佳性能。纳米粘土不能有效改善碳酸钙钻井液的流变性能。
Drilling fluid constitutes an important part of the drilling operations. Gel strength property of drilling fluids plays a key role in drilling multilateral and long horizontal reservoir sections. Losing the gel strength will accumulate drilled cuttings and as a result, sticking of the drill string. Solving this issue takes a long time and increase the total cost of the drilling operations. The objectives of this paper are to (1) determine the rheological properties of calcium carbonate water-based drilling fluid over a wide range of temperature, (2) assess the effect of adding nanoclay, bentonite, and nanosilica on the gel strength problem associated with the current field formulation of calcium carbonate water-based drilling fluids, and (3) optimize the concentration of bentonite, nanosilica, and nanoclay in the drilling fluid. The concentration of bentonite, nanoclay, and nanosilica was varied from 1 wt% to 10 wt%. Rheological properties results confirmed that the gel strength of the calcium carbonate water-based drilling fluid reached zero Ib/100ft(2) by increasing the temperature to 200 degrees F (93.33 degrees C). This issue was solved by adding different concentrations of bentonite, nanoclay, and nanosilica. At low bentonite concentrations (3.33 wt%), the gel strength still reduced with time. At high bentonite concentrations (10 wt%),the gel strength increased with time. The optimum concentration of bentonite was 6.66 wt%, which yielded a flat rheology profile of the gel strength. These results confirmed that the rheological properties of the water-based drilling fluid were optimized by using bentonite. Similarly, 7.5 wt% nanosilica showed the optimum performance. Nanoclay was not effective in improving the rheological properties of the calcium carbonate drilling fluid.