Casing annulus remediation system

In a well having a tubing head having at least one access port, and a casing string in said tubing head that defines a casing annulus surrounding said casing, and an access passage through said tubing head from said annulus, the improvement comprising:

• a flexible elastomeric hose having an upper end, the hose passing through said access port and down said annulus to a selected depth;
• terminal fitting assembly on said upper end of said hose, said terminal fitting assembly seated and sealed in said access port and having a check valve to prevent leakage of pressure out of said upper end of said hose;
• and
• a pump operatively engaged with said check valve and flexible hose for delivering a remediation fluid through said hose to displace the well fluid in said casing annulus.

An apparatus for installation in a well to deliver a remediation fluid into said well, said well having a tubing head with a laterally extending access port, said apparatus comprising:

• a flexible hose having an upper end and a lower end;
• a tubing nose on said lower end of said hose which has a closure member that is capable of holding a pressure to make said hose rigid, enabling said hose to be pushed down said well, wherein said closure member opens by increasing pressure in said hose to subsequently allow a remediation fluid to be pumped through said hose;
• a blow-out preventer adapted to be releasably mounted to said tubing head at said access port for closing around said hose in the event of an emergency;
• a packoff mounted to said blow-out preventer for sealing around said hose as said hose is being inserted in said well;
• a pump in communication with said hose to apply pressure to make said hose rigid to facilitate insertion into the well;
• terminal fitting for installation on said upper end of said hose that reaches a desired depth, said terminal fitting adapted to seat and seal in said access port;
• and
• a valve for mounting to said tubing head at said access port after removal of said blow-out preventer and said packoff, said valve enabling said pump to discharge remediation fluid through said valve, said terminal fitting and said hose.

A method of installing a conduit into a well having a wellhead having an access passage comprising the steps of:

• (a) passing a flexible hose through said access passage into an upper end of the well;
• (b) closing a lower end of said hose and pressurizing said hose to a first pressure to make said hose substantially rigid;
• then
• (c) pushing said hose downward in said well to a desired depth;
• then;
• (d) securing a fitting to an upper end of said hose and sealingly securing the fitting in the access passage;
• then
• (e) pumping a fluid through said fitting into said hose;
• (f) opening said lower end of said hose by increasing the pressure of the fluid within said hose;
• then
• (g) flowing said fluid out of said lower end of said hose.