A well treatment method for squeezing and gravel packing, comprising: running in an outer assembly that comprises a packer, an outer string supported by said packer and leading to at least one screen and further comprising at least one outer exit port between said packer and said screen; supporting said outer assembly with an inner string assembly for run in where the inner string assembly is in turn supported on a running string and the inner string assembly comprises a crossover tool to selectively allow gravel to pass through the inner string and out toward said outer exit port of said outer assembly with returns coming through said screen and said crossover tool to an upper annulus defined above said packer and around said running string; setting said packer to isolate a zone in a wellbore for said screen from said upper annulus and define a lower annulus; defining a squeeze position for forcing fluid into the wellbore through said lower annulus, a circulate position where gravel is deposited in said lower annulus and returns come through said screen and past said packer to said upper annulus and a reverse position where gravel in said inner string above said crossover can be reversed out to the surface, by relative movement of at least a portion of said inner string with respect to said packer; and providing a valve assembly adjacent a lower end of said inner string assembly, said valve assembly being open for run in and characterised by requiring movements of said valve assembly in two opposed directions through a spaced apart end of a restricted bore in said outer assembly before said valve assembly can close. running in an outer assembly that comprises a packer, an outer string supported by said packer and leading to at least one screen and further comprising at least one outer exit port between said packer and said screen; supporting said outer assembly with an inner string assembly for run in where the inner string assembly is in turn supported on a running string and the inner string assembly comprises a crossover tool to selectively allow gravel to pass through the inner string and out toward said outer exit port of said outer assembly with returns coming through said screen and said crossover tool to an upper annulus defined above said packer and around said running string; setting said packer to isolate a zone in a wellbore for said screen from said upper annulus and define a lower annulus; defining a squeeze position for forcing fluid into the wellbore through said lower annulus, a circulate position where gravel is deposited in said lower annulus and returns come through said screen and past said packer to said upper annulus and a reverse position where gravel in said inner string above said crossover can be reversed out to the surface, by relative movement of at least a portion of said inner string with respect to said packer; and providing a valve assembly adjacent a lower end of said inner string assembly, said valve assembly being open for run in and characterised by requiring movements of said valve assembly in two opposed directions through a spaced apart end of a restricted bore in said outer assembly before said valve assembly can close.