Patent ID: 8985216
Filing Date: 2015-03-24
Classification: E21B,F16F

Abstract:
1. An assembly of a sliding sleeve and a shock absorber for use in a subterranean location comprising: a housing having at least one selectively covered open wall opening by a sliding sleeve surrounding a passage through said housing, said passage defined by a drift dimension that is the smallest dimension for tool passage through said housing; a hydraulic shock absorber surrounding said passage actuated by initial movement of said sliding sleeve into contact with said hydraulic shock absorber to then move said shock absorber to absorb the impact from said sliding sleeve; said shock absorber defining a variable volume adjacent said passage; said variable volume is formed between a sleeve movable upon impact from said sliding sleeve and said housing, movement of said sleeve directly reduces said variable volume; said sleeve and said sliding sleeve have an internal diameter at least as large as said drift dimension.