0 引言
1 实验设备和过程
1.1 实验设备
Fig. 1 Schematic diagram of experimental apparatus图1 实验装置示意图 |
1.2 实验过程
Table 1 Experimental study on hydrate formation under stirring conditions表1 搅拌条件下水合物的生成规律研究实验条件 |
实验序号 | 温度 / K | CaCl2浓度 / % (质量浓度) | 含水率 / % (体积含量) |
---|---|---|---|
1 | 273.15 | 3.5 | 10 |
2 | 273.15 | 3.5 | 20 |
3 | 273.15 | 3.5 | 40 |
4 | 275.15 | 3.5 | 10 |
5 | 275.15 | 3.5 | 20 |
6 | 275.15 | 3.5 | 40 |
7 | 278.15 | 3.5 | 10 |
8 | 278.15 | 3.5 | 20 |
9 | 278.15 | 3.5 | 40 |
10 | 275.15 | 10.0 | 20 |
11 | 275.15 | 10.0 | 40 |
2 结果与讨论
2.1 水合物体积分数计算
2.2 温度对水合物的生成影响
Fig. 2 Change of gas consumption and hydrate volume fraction in oil-based drilling fluid at different temperatures: (a) water cut of 10%; (b) water cut of 20%; (c) water cut of 40%图2 不同温度下油基钻井液中气体消耗量及水合物体积分数变化:(a)含水率为10%;(b)含水率为20%;(c)含水率为40% |
Table 2 Hydrate volume fraction and water conversion fraction in oil-based drilling fluid with different water cut表2 各温度下不同含水率油基钻井液中水合物体积分数和水转化率 |
实验序号 | 温度 / K | 含水率 / % (体积含量) | 水合物 / % (体积含量) | 水最终转化率 / % |
---|---|---|---|---|
1 | 273.15 | 10 | 8.93 | 74.98 |
2 | 275.15 | 10 | 8.88 | 71.15 |
3 | 278.15 | 10 | 8.15 | 65.24 |
4 | 273.15 | 20 | 15.95 | 64.84 |
5 | 275.15 | 20 | 15.12 | 61.35 |
6 | 278.15 | 20 | 14.73 | 59.72 |
7 | 273.15 | 40 | 27.91 | 58.16 |
8 | 275.15 | 40 | 25.84 | 53.62 |
9 | 278.15 | 40 | 21.63 | 44.49 |
2.3 含水率对水合物的生成影响
Fig. 3 Change of gas consumption and hydrate volume fraction in oil-based drilling fluid with different water cut: (a) 273.15 K; (b) 275.15 K; (c) 278.15 K图3 各温度下不同含水率油基钻井液中气体消耗量及水合物体积分数变化:(a)273.15 K;(b)275.15 K;(c)278.15 K |
2.4 CaCl2浓度对水合物生成的影响
Fig. 4 Change of gas consumption and hydrate volume fraction in oil-based drilling fluid with different concentration of CaCl2图4 不同CaCl2浓度下油基钻井液中气体消耗量及水合物体积分数变化 |
2.5 水合物含量对油基钻井液相对电流的影响
Fig. 5 Relative current change of oil-based drilling fluid at different temperatures during hydrate formation: (a) water cut of 10%; (b) water cut of 20%; (c) water cut of 40%图5 不同温度下各含水率油基钻井液在水合物生成过程中相对电流变化:(a)含水率为10%;(b)含水率为20%;(c)含水率为40% |