Abstract MEA S CONNECTING THE ENDS OF SAID SLEEVE IN FLUID-TIGHT RELATIONSHIP WITH SAID TUBING SECTION TO FORM AN ANNULAR CHAMBER BETWEEN SAID TUBING SECTION AND SAID SLEECE, PORT MEANS COMMUNICATING WITH SAID ANNULAR CHAMBER FOR INFLATING SAID RESILIENT SLEECE AND AN IMPRESSION SLEEVE CONNECTED TO SAID RESILIENT SLEEVE FOR EXPANSION AND CONTRACTION THEREWITH, SAID IMPRESSION SLEEVE COMPRISING A SMOOTH ROLLED SHEET CONTAINING ABOUT 60 TO 80 PERCENT BY WEIGHT PARTIALLY CURED SYNTHETIC NITRILE RUBBER INCLUDING CURE CHEMICALS, ABOUT 10 TO 20 PERCENT BY WEIGHT NATURAL RUBBER SMOKED SHEET, ABOUT 5 TO 15 An impression packer for use in obtaining impressions in wells and having an impression sleeve formed of a mixture of partially cured synthetic nitrile rubber, natural rubber smoked sheet, silica powder and rubber processing oil.
An impression packer comprising a tubing section, an elongated resilient sleeve positioned over said tubing section, means connecting the ends of said sleeve in fluid-tight relationship with said tubing section to form an annular chamber between said tubing section and said sleeve, port means communicating with said annular chamber for inflating said resilient sleeve and an impression sleeve connected to said resilient sleeve for expansion and contraction therewith, said impression sleeve comprising a smooth rolled sheet containing about 70 to 75 percent by weight partially cured synthetic nitrile rubber including cure chemicals, about 14 to 16 percent by weight natural rubber smoked sheet, about 7.5 to 8.5 percent by weight hydrated amorphous silica, and about 3.5 to 4.5 percent by weight of rubber processing oil.
Claim 2
Dependent Claim
117 words
An impression packer comprising a tubing section, an elongated resilient sleeve positioned over said tubing section, means connecting the ends of said sleeve in fluid-tight relationship with said tubing section to form an annular chamber between said tubing section and said sleeve, port means communicating with said annular chamber for inflating said resilient sleeve and an impression sleeve connected to said resilient sleeve for expansion and contraction therewith, said impression sleeve comprising a smooth rolled sheet containing about 73.4 percent by weight partially cured synthetic nitrile rubber including cure chemicals, about 15.7 percent by weight natural rubber smoked sheet, about 7.9 percent by weight hydrated amorphous silica, and about 4.0 percent by weight of rubber processing oil.