Finite Element Analysis Of Horizontal Well Fracturing Packer Performance

Horizontal well multi-stage fracturing technology is an important means for the oil and gas fields in low permeability reservoir,the development of horizontal well multi-stage fracturing technology has made it increasingly evident in the effect of low permeability oil and gas fields,the technology has become the key technologies of unconventional reservoirs to achieve effective development,with leading a major reform of the global oil and gas resources exploration and development.The packer is an important tool of multi-stage fracturing,whether packer performance is good or not influents largely on productivity,therefore,the study of the packer is particularly important.In this paper,the research methods is theoretical analysis and numerical simulation,take Y341-114 type compression packer for example,there are three different packer models,which are all axisymmetric two-dimensional model,taking finite element software ABAQUS for simulation analysis,to analysis packer rubber length,thickness and beveled end surface,to study the impaction of axial load,friction coefficient,loading mode on packer contact stress,contact stress determines results of packer performance.The results show that when the length of the packer rubber is 85 mm,contact stress between the plastic tube and the sleeve is maximum;total thickness of 20 mm and adjunctive thickness of 8mm is sub-optimal structure size;when beveled end surface at about 45 ° is the maximum contact stress.Of the three structural model analysis,contact stress and compression distance increases as the axial load increases,the fastest growing contact stress near the loading,compressive distance changes significantly when axial load is small,when the axial load is large compression distance becomes stable;the impact of loading and friction coefficient on contact stress is more obvious,when the axial load is the same,the contact stress will gradually become smaller with the increase of the friction coefficient,since the contact stress near the loading end is maximum,so to determine the loading mode of the packer according to pressure direction.These conclusions are able to provide theoretical guidance optimize the design and site construction for horizontal well multi-stage fracturing packer.