Self monitoring oil pump seal

A self monitoring oil well head sealing system having a rotating drive shaft extending from a drive head down a casing, a high pressure progressive cavity downhole oil well pump connected to an operated by said drive shaft, a sleeve adapted to sealingly slip over said drive shaft, said sleeve having an external coating providing a hard and smooth sealing surface comprising a flame sprayed metal alloy having a surface smoothness of between +0.000 inch and -0.002 inch with a surface finish of 6-8 rms and a hardness of 60-65 Rc, a primary seal housing connected to said casing having a bore therein adapted to accept said rotating drive shaft therethrough into said casing, a primary seal in the bore of said primary seal housing, said primary seal bearing against said hard and smooth surface of said sleeve and sealed to said bore, a bearing housing surrounding said sleeve and connected to said primary seal housing, said bearing housing having a bearing contacting the hard and smooth surface of said sleeve at a location immediately adjacent to said primary seal, a secondary seal housing about said sleeve and connected to said bearing housing, and a secondary seal in said secondary seal housing, sealed to said secondary housing and sealing against said hard and smooth surface of said sleeve, said primary seal and secondary seals having a space therebetween, and a means for detecting gas and fluid pressure connected to said space between said primary and secondary seals.

An oil well head seal system comprising in combination:

• a drive shaft rotatably operable and extending from a drive head down a casing;
• a high pressure progressive cavity downhole oil well pump connected to and operated by said drive shaft;
• a sleeve adapted to sealingly slip over said drive shaft, said sleeve having a coating providing an external hard and smooth sealing surface;
• a primary seal housing adapted to connect to said casing and further having a bore therein adapted to accept said drive shaft therethrough into said casing;
• a primary seal in the bore in said primary seal housing, said primary seal pressing against the external sealing surface of said sleeve, and said primary seal being sealed to said bore;
• a bearing housing surrounding said sleeve and connected to said primary seal housing;
• a bearing in said bearing housing and surrounding said sleeve, said bearing contacting the external sealing surface of said sleeve at a location immediately adjacent to said primary seal so as to prevent transverse movement of said sleeve against said primary seal;
• a secondary seal housing about said sleeve and connected to said bearing housing;
• a secondary seal in said secondary seal housing, sealed to said secondary seal housing and sealing against said external sealing surface of said sleeve;
• and
• wherein the external sealing surface of said sleeve is a coating of a flame sprayed metal alloy having a surface smoothness of between +0.000 inch and -0.002 inch with a surface finish of 6-8 rms and a hardness of 60-65 Rc.