Abstract: A pair of elongated inner and outer tubular members are provided with pairs of corresponding loosely telescoped opposite end portions defining annular passages therebetween. The midportions of the tubular members are secured relative to each other and include port structure communicating the interior of the central portion of the inner tubular member with the exterior of the central portion of the outer tubular member. In addition, the inner and outer tubular members include coacting structure, in the areas of the midportions thereof, communicating the aforementioned annular passages with each other independent of the exterior of the outer tubular member, the interior of the inner tubular member and the port structure communicating the interior of the midportion of the inner member with the exterior of the midportion of the outer member.

Abstract: An elongated tubular assembly is provided defining a longitudinal central passage therethrough. Longitudinally spaced opposing packer structures are carried by and extend about the exterior of the tubing assembly and the latter includes a bypass passage extending therealong, independent of the central passage, opening at its opposite ends to the exterior of the tubular assembly on the remote sides of the packer structures. The tubular assembly further includes generally radial perforation wash fluid passages opening inwardly into the central passage at their inner ends and outwardly of the exterior of the tubular assembly intermediate the packer structures. The tubular assembly is disposed in a tubing string immediately above a full opening and full closing tubing section disposed therebelow and supporting a drag block at its lower end and the tubular assembly is disposed immediately below a selectively openable and closable fluid bypass tube section disposed thereabove.