Study On Oil - Based Drilling Fluid Technology In Shallow Gas Well

In the exploration and development of shale gas in Western Sichuan, horizontal wells, such as inhibitive, sealing, lubrication, low filter loss performance of water-based drilling fluid is difficult to meet the construction needs, often encountered off block, friction, tripping difficult problems such as serious, blocking, easy to cause the underground complex situations or accidents. In order to achieve the purpose of safety and fast drilling exploration and development, the use of oil base drilling fluid system, but the Western Sichuan area and development of shale gas also belongs to the first, so far there is no mature drilling fluid technology, through research and draw lessons from domestic and international mature oil base drilling fluid system, from the start of drilling fluid with strong inhibition, sealing excellent, lubricity, rheology and low filtration etc., for horizontal wells in Western Sichuan gas shale oil base drilling fluid technology research. In the processing of oil based agent, through the optimization of emulsifier of single agent, preferably a main milk RZRH-03and auxiliary milk RZRH-01, compound emulsion breaking voltage can reach500V after use, can form a stable emulsion system. Through the oil based reduced water loss and formulation optimization experiment, loss reducing effect is better JHC, JHC used alone and combined use of precipitation agent YRNQ can reach the performance requirements of the oil base drilling fluid. According to the wetting agent reasonable HLB value, combined with the performance comparison of experimental evaluation of wetting agent, wetting agent RY-01is developed, which has better effect on the oil base drilling fluid, this product can basically meet the other general wetting agent level. Combined with the treatment agent is preferably result optimization formation of the oil base drilling fluid system, density can meet the requirement of1.8-2.15g/cm3, breaking voltage can reach800V, anti temperature up to150℃stable performance, inhibit, plugging, strong anti pollution performance, ultimately form a set can satisfy the oil base drilling fluid technology and construction technology of shale gas levels in Western Sichuan well.