The Development and Properties of PC–W31L Flushing Fluid for Oil-Based Drilling Fluid
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摘要:
针对油基钻井液用水包油型冲洗液无法用润湿测定仪检测混合液（即油基钻井液与冲洗液的混合液，全文同）电导率的问题，优选复配了合适的表面活性剂和溶剂，并引入一种含氮类聚合物，制备了油基钻井液用冲洗液PC–W31L。分析了PC–W31L冲洗油基钻井液的作用机理，并对其性能进行了评价。结果表明：PC–W31L对油基钻井液的冲洗效果良好，冲洗界面为水润湿状态，能使油基钻井液由油连续相完全转变为水连续相；PC–W31L与油基钻井液、水泥浆的流变相容性良好，对水泥浆稠化时间和抗压强度的影响均在可控范围内。研究表明，冲洗液PC–W31L不但对油基钻井液的冲洗效果良好，且能用润湿测定仪测定其水润湿能力。
Abstract:We address the problem of not being able to detect the conductivity change of mixed liquid (oil-based drilling fluid and flushing fluid) in oil-based drilling fluid. Flushed by oil-in-water based flushing fluid with the wetting tester, the proper surfactant and solvent were optimized and compounded, and a nitrogen-containing polymer was introduced to develop the PC–W31L flushing fluid for oil-based drilling fluid. The flushing mechanism of this fluid on oil-based drilling fluid was analyzed and its performance was evaluated. The results showed that the flushing effect of PC–W31L flushing liquid on oil-based drilling fluid was optimal, the flushing interface was in water wet state, which can completely transform oil-based drilling fluid from the oil continuous phase to the water continuous phase. The rheology compatibility of this fluid is better with oil-based drilling fluid and cement slurry respectively, and its influences on the thickening time and strength of cement slurry are all within the controllable range. The results of performance evaluation indicated that PC–W31L flushing liquid not only had a good flushing effect on oil-based drilling fluid, but also allowed the wetting tester to detect its water wetting capacity.
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Keywords:
- oil-based drilling fluid /
- flushing fluid /
- wettability /
- compatibility /
- cement slurry
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图 2 主剂A加量对冲洗效果的影响
Figure 2. Influence of the dosage of main agent A on the flushing effect
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图 3 辅剂B加量对冲洗效果的影响
Figure 3. Influence of the dosage of assisting agent B on flushing effect
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图 4 不同密度PC–W31L冲洗相应密度油基钻井液的效果
Figure 4. The effect of oil-based drilling fluid with different densities flushed by PC–W31L flushing fluids with corresponding density
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图 5 不同密度PC–W31L冲洗油基钻井液后的界面水润湿效果
Figure 5. Interface water wetting effect of oil-based drilling fluid flushed by PC–W31L flushing fluids with different densities
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图 6 不同密度PC–W31L对相应密度油基钻井液的水润湿能力
Figure 6. The water wetting ability of PC–W31L flushing fluids with different densities for oil-based drilling fluid with corresponding density
表 1 密度1.20 kg/L的PC–W31L与相同密度油基钻井液的流变相容性
Table 1 Rheological compatibility of PC–W31L flushing fluid with density of 1.20 kg/L and oil-based drilling fluid of the same density
体积比① 六速黏度计读数 R ϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 0∶100 32 21 16 11 2 1 5∶95 11 7 5 4 1 1 –17 25∶75 18 9 5 3 1 1 –18 50∶50 16 8 6 4 1 1 –17 75∶25 49 27 19 11 2 1 –10 95∶5 68 42 31 19 6 4 –2 100∶0 68 43 32 21 7 6 注：①为PC–W31L与油基钻井液的体积比，下同。 
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表 2 密度为1.80 kg/L的PC–W31L与相同密度油基钻井液的流变相容性
Table 2 The rheological compatibility of PC–W31L flushing fluid with density of 1.80 kg/L and oil-based drilling fluid with the same density
体积比 六速旋转黏度计读数 R ϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 0∶100 52 32 24 14 2 1 5∶95 64 34 27 17 3 2 –8 25∶75 58 32 24 15 6 4 –10 50∶50 44 22 16 10 4 2 –15 75∶25 51 28 21 13 5 4 –12 95∶5 82 48 37 24 9 7 –1 100∶0 75 47 37 25 11 9
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表 3 密度为1.20 kg/L的PC–W31L与密度为1.50 kg/L水泥浆的流变相容性
Table 3 Rheological compatibility of PC–W31L flushing fluid with density of 1.20 kg/L and cement slurry with density of 1.50 kg/L
体积比 六速旋转黏度计读数 R ϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 95∶5 38 27 22 14 4 2 –57 75∶25 67 42 29 19 4 3 –52 50∶50 73 46 33 21 4 3 –50 25∶75 110 67 50 31 6 4 –40 5∶95 196 131 101 67 13 7 –4 0∶100 203 137 106 71 15 8 注：②为PC–W31L与水泥浆的体积比，下同。
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表 4 密度为1.80 kg/L的PC–W31L与密度为1.90 kg/L水泥浆的流变相容性
Table 4 The rheological compatibility of PC–W31L flushing fluid with density of 1.80 kg/L and cement slurry with density of 1.90 kg/L
体积比 六速旋转黏度计读数 R ϕ600 ϕ300 ϕ200 ϕ100 ϕ6 ϕ3 95∶5 56 34 18 13 2 1 –48 75∶25 65 39 21 16 3 1 –45 50∶50 82 51 32 21 4 2 –40 25∶75 124 71 48 26 5 2 –35 5∶95 232 139 98 55 7 4 –6 0∶100 262 151 108 61 8 5
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表 5 密度为1.20 kg/L的PC–W31L对密度为1.50 kg/L水泥浆稠化时间及抗压强度的影响
Table 5 Effect of PC–W31L flushing fluid with density of 1.20 kg/L on the thickening time and compressive strength of cement slurry with density of 1.50 kg/L
体积比 稠化时间/min 24 h抗压强度/MPa 100∶0 148 17.2 95∶5 163 15.3 85∶15 178 11.1 75∶25 203 6.4 注：测试条件为90 ℃×40 MPa。
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表 6 密度为1.80 kg/L的PC–W31L对密度为1.90 kg/L水泥浆稠化时间及抗压强度的影响
Table 6 Effect of PC–W31L flushing fluid with density of 1.80 kg/L on the thickening time and compressive strength of cement slurry with density of 1.90 kg/L
体积比 稠化时间/min 24 h抗压强度/MPa 100∶0 204 22.2 95∶5 203 18.2 85∶15 188 14.3 75∶25 176 9.3 注：测试条件为120 ℃×60 MPa。
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