Gas lift system for wells

Claim 1

IN A GAS LIFT SYSTEM FOR WELLS HAVING A CASING, A CONDUIT FOR SUPPLYING LIFTING GAS UNDER PRESSURE TO THE INTERIOR OF THE CASING, A FLOW PIPE STRING INSIDE THE CASING COMPRISING A LOWER SECTION ANCHORED AGAINST MOVEMENT AND AN UPPER SECTION RECIPROCABLE RELATIVE TO THE LOWER SECTION, TELESCOPING COUPLING MEANS CONNECTING SAID SECTIONS, SAID COUPLING MEANS DEFINING PORT MEANS ADAPTED TO OPEN AND CLOSE IN RESPONSE TO RECIPROCATION OF SAID UPPER SECTION, FLUID PRESSURE-ACTUATED MEANS CONNECTED TO SAID UPPER SECTION FOR RECIPROCATING THE SAME, FIRST TIME-RESPONSIVE MEANS OPERABLY CONNECTED TO THE FLUID-ACTUATED MEANS TO PERIODICALLY CAUSE SAID UPPER SECTION TO MOVE DOWNWARDLY TO OPEN SAID PORT MEANS TO THEREBY ADMIT LIFTING GAS INTO THE FLOW PIPE STRING FROM THE CASING, MEANS OPERABLE IN RESPONSE TO THE RESULTING PRESSURE DROP IN THE CASING TO HOLD SAID UPPER PIPE STRING SECTION IN SAID PORTOPENING POSITION AND TO CAUSE GAS TO FLOW FROM SAID CONDUIT INTO THE CASING, AND SECOND TIME-RESPONSIVE MEANS OPERABLE PERIODICALLY TO CAUSE SAID UPPER SECTION OF THE PIPE STRING TO MOVE UPWARDLY TO THE PORT-CLOSING POSITION.