Fremgangsmåte for bruk av nedihulls lineær indekseringsanordning

En lineær indekseringsanordning (250) og tilhørende fremgangsmåter for bruk av denne gir hensiktsmessig betjening av verktøy i en underjordisk brønnboring. I en foretrukken utførelse har den lineære indekseringsanordning (250) et ytre rørformet hus (264) og en rørformet dor (262) aksielt glidbart plassert i huset (264). To sett holdekiler blir benyttet for trinnvis å forskyve doren (262) i forhold til huset (264). Et stempel forbundet til ett av settene med holdekiler tillater at doren (262) kan trinnviss indekseres som reaksjon på en serie gjentatte påføringer av en forutbestemt trykkforskjell. Indexing apparatus (10) disposable for use in a subterranean wellbore. The apparatus comprises a generally tubular first member (22, 36) having an axially extending bore (24) internally formed thereon and a generally tubular second member (30) having an outer side surface (52). The second tubular member (30) is axially slidingly received within the bore (24). A first slip member (56) grippingly engages one of the first and second tubular members to prevent relative displacement of the first and second tubular members in a first axial direction, while permitting relative displacement of the first and second tubular members in a second axial direction opposite to the first axial direction. A second slip member (58) is axially spaced apart from the first slip member (56), and grippingly engages the one of the first and second tubular members to restrict displacement of the one of the first and second tubular members relative to the other of the first and second tubular members in the first axial direction, while permitting displacement of the one of the first and second tubular members relative to the other of the first and second tubular members in the second axial direction.