Retrievable packer

A packer for isolating a selected depth of a borehole and for cementing a casing to said borehole, said casing having a wall, said packer comprising:

• a body member having a first end and a second end, said body member defining a passage therethrough for fluid communication and including a piston having a piston head;
• a cylinder slidably receiving said piston head, said cylinder defining a shoulder proximate said piston head and defining a chamber between said piston head and said shoulder, said chamber being sealed from communication with said passage of said body member;
• a sealing member carried annularly by said body member having an upper end proximate said shoulder of said cylinder and a lower end supported by said second end of said body member, said sealing member being fabricated from an elastomeric material;
• a pressurized fluid source for injecting a pressurized fluid into said chamber to cause said chamber to expend thereby forcing said cylinder downward such that said shoulder of said cylinder is forced against said upper end of said sealing member causing expansion of said sealing member against said wall of said casing;
• a fluid delivery tube removably connected to said first end of said body member for delivering a second fluid to said passage of said body member, said second fluid being cement for sealing an annular space between said casing and said borehole;
• and,
• a valve assembly carried by said body member proximate said second end to prevent back flow from exterior of said body member into said body member.

A packer for isolating a selected depth of a borehole and for cementing a casing to said borehole, said casing having a wall, said packer comprising:

• a body member having a first end and a second end, said body member defining a passage therethrough for fluid communication and including a piston having a piston head;
• a cylinder slidably receiving said piston head, said cylinder defining a shoulder proximate said piston head and defining a chamber between said piston head and said shoulder, said chamber being sealed from communication with said passage of said body member;
• a sealing member carried annularly about said body member, said sealing member having an upper end proximate said shoulder of said cylinder;
• a pressurized fluid source for injecting a pressurized fluid into said chamber to cause said chamber to expend thereby forcing said cylinder downward such that said shoulder of said cylinder is forced against said upper end of said sealing member causing expansion of said sealing member against said wall of said casing;
• a fluid delivery tube removably connected to said first end of said body member for delivering a second fluid to said passage of said body member, said second fluid being cement for sealing an annular space between said casing and said borehole;
• a valve assembly carried by said body member proximate said second end to prevent back flow from exterior of said body member into said body member;
• and,
• a washing means for washing cement from said fluid delivery tube and said body member following said sealing of said annular space with said cement, said washing means comprising a washout tee, a washout tube and a seal, said washout tee having a first end and a second end, said washout tee defining at least one outlet and a passage therethrough from said first end to said second end, said second end of said washout tee being releasably engaged to said fluid delivery tube, said washout tube passing through said passage of said washout tee and through said fluid delivery tube and said body member whereby a wash solution can be passed through said washout tube into said fluid delivery tube and said body member and out through said outlet of said washout tee to remove remaining cement in said delivery tube and said body member, said seal being disposed at said first end of said washout tee and surrounding said washout tube to prevent escape of said wash solution at said first end of said washout tee.