Impact of transverse partition thickness, number and spacing along wit
h alignment between packer and tubing on liquid leaks between them is
addressed. A number of plunger sealing capacity tests was performed fo
r a device combined of numerous consecutive plungers. A specially desi
gned plunger was installed to maintain piston/cylinder sealing capacit
y before wear-resistant, high-strength packing seals become completely
unfit for service.