Application of Multifunctional Consolidation and Plugging Technology in Carbonate Rock Formation in Well Area Yi 202
The well area Yi 202 is located in the Tiangongtang structure.Due to the influence of block struc-tures,faults and fractures are more developed in this well area,resulting in frequent lost circulation in carbonate formation.In addition,the Maokou Formation is developed with high pressure and coexistence of lost circulation and overflow.At the same time,the poor particle size matching of bridge plugging slurry and the weak retention capacity of cement slurry lead to poor plugging effect and low success rate.In this paper,the multifunctional consolidation and pressure-bearing plugging technology is studied.The flexible fiber,rigid fine particle and cu-ring agent are selected as the multi-functional consolidation and pressure-bearing plugging agent in this technolo-gy.It combines two plugging modes:bridge filtration consolidation and overall consolidation.Under the action of time and ground temperature,it thickens and solidifies.The initial consolidation body of 12-24 hours has high sealing strength,and with the passage of time,the strength will further increase.Through indoor evaluation,the maximum sealing strength of the consolidated body is above 19 MPa,and the consolidated body will experience slight expansion with time,with an expansion rate of up to 0.6％.In the field application of Formation Leikoupo of Well Yi 215,the equivalent density of pressure-bearing capacity is increased by 0.36 g/cm3,and the complex treatment cycle is reduced by 75.51％compared to the same area.This technology is suitable for various water-based drilling fluids with densities of 1.40-2.00 g/cm3,and can meet the safety operation requirements under conditions at 40℃-150℃.
well area Yi 202carbonate formationfracturemultifunctional consolidationpressure-bearing plugging technology
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维普
