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Oil in water drilling fluid is a suitable water based drilling fluid for horizontal well, because of good lubricity, liquidity and borehole stability. Optimized and matching emulsifiers, in the2:8 ratio of oil to water, the emulsifiers OP-10+SP-80 ratio of 3:2 is the best effect of emulsion stability, the formation of oil in water drilling fluid system have low filter loss, strong stability, low lubricating coefficient properties , which can meet the needs of drilling horizontal well design. The crude oil in Water drilling fluid application in Xin Sha21-1H,Xin Sha23-1H and XinSha 21-3H well shows that, the oil in water drilling fluid system has good rheological properties and lubricating property. The average single well diameter expanding rate of 12.23%, lower than 16.75% with other well. Utilization drilling rate increased from 35.82% to 54.67%, which increase 52.6% significantly reduced the horizontal well drilling cycle. Introduction The development of horizontal drilling technology provide a new way for improve exploration, the technology has become the one of most important oil industry technology in now. The current level of foreign drilling fluid system is mainly used in the drilling process are five: polymer drilling fluid, oil-based drilling fluid, clean brine drilling fluid, mixed metal layered hydroxides and foam or inflatable drilling fluid. Oil in water drilling fluid system has both water-based drilling fluid characteristics and has oil-based drilling fluid lubrication advantages, mainly used to solve some of the horizontal well borehole instability, poor performance of the drilling fluid lubrication technical problems. This system performance is stability, has good liquidity, low fluid filter loss, wellbore stability strong capacity; performance easily monitor, control and adjustment. The system has low cost compared to pure oil-based drilling fluid, low environmental pollution, is one of the preferred chose for horizontal well drilling. The establishing of oil in water drilling fluid emulsifier According to theory, the HLB value (hydrophilic-lipophilic balance) in the range of 8-18, emulsifier can be used as emulsifier in oil in water drilling fluid. But in the actual application process, one emulsifier emulsifying effect is not ideal, usually several mutually emulsifier mixed use. Emulsifiers having an HLB value plus the corresponding proportion and nature. From raw material economy and practical point of view, the project choose crude oil as based oil, pH is adjusted to 10, evaluate the stability of the emulsion, optimization preferably suitable emulsifier. In this study, referring to the drilling fluid emulsion stability evaluation in "SY-T 6615-2005 drilling fluid emulsifier evaluation process", doing the evaluation about the commonly used emulsifier for emulsification. The evaluation show in table 1. 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering (ICMMCCE 2015) © 2015. The authors Published by Atlantis Press 857 Table1 2:8 Oil-water emulsion stability No. Emulsifier name Stratification after 24h Upper layer Middle layer Low layer 1 TW-85 34mL No stratification 2 OP-10 34mL No stratification 3 TW-80 38mL No stratification 4 ABS 14mL No stratification 5 TW-80:OP-10=1:1 21mL 8mL Clear 6 TW-80:OP-10=2:1 19mL 12mL Clear 7 TW-80:OP-10=3:2 18mL 10mL Clear 8 TW-80:SP-80=1:1 5mL 9mL Clear 9 TW-80:SP-80=2:1 6mL 12mL Clear 10 TW-80:SP-80=3:2 4mL 8mL Clear 11 TW-85:SP-80=1:1 15mL 18mL Clear 12 TW-85:SP-80=2:1 17mL 17mL Clear 13 TW-85:SP-80=3:2 14mL 16mL Clear 14 OP-10:SP-80=1:1 4mL 12mL Clear 15 OP-10:SP-80=2:1 3mL 14mL Clear 16 OP-10:SP-80=3:2 2mL 9mL Clear 17 ABS: SP-80=1:1 14mL 17mL Transparent 18 ABS: SP-80=2:1 15mL 19mL Transparent 19 ABS: SP-80=3:2 13mL 22mL Transparent Remark: The upper layer is not emulsified crude oil, the middle layer is breaking emulsions, the low layer is stable emulsions. From the experimental date in Table 1, in the oil-water ration 2:8 cases, crude oil can’t be emulsified by a single emulsifier, and can’t form a stable oil-in-water emulsion system. The use of complex ways to emulsify the crude oil has more significant effect, In order to research the effect of the amount of emulsifier on the emulsion stability.Emulsifier dosage evaluate experimental data are shown in Table 2. Table 2 Emulsifier dosage evaluation of experimental data No Emulsifier name Ratio Stratification after 24h Upper layer Middle layer Low layer 1 TW-80:SP-80=3:2 4% 15mL 6mL Clear 2 6% 7mL 12mL Clear 3 10% 4mL 8mL Clear 4 15% 5mL 9mL Clear 5 20% 3mL 9mL Clear 6 OP-10:SP-80=3:2 4% 14mL 16mL Clear 7 6% 11mL 7mL Clear 8 10% 2mL 9mL Clear 9 15% 2.5mL 10mL Clear 10 20% 2mL 8mL Clear Remark: The upper layer is not emulsified crude oil, the middle layer is breaking emulsions, the low layer is stable emulsions. From the experimental date in Table 2, in the oil-water ration 2:8 cases, the choice of emulsifier dosage is 10% of crude oil, it has been able to promote sufficiently emulsified crude oil, has good emulsion stability. Oil-in-water drilling fluid system optimization On the basis of the water-based drilling fluid formulations research emulsifier system OP-10: SP-80 = 3: 2 is introduced into the drilling fluid performance changes, investigate different oil-in-water drilling fluid rheology and lubricity. Show in Table 3.

Crude Oil in Water Drilling Fluid Properties and Application in Horizontal Wellbore Drilling