公开(公告)号：WO2021202087A1

公开(公告)日：2021-10-07

申请号：PCT/US2021/022185

申请日：2021-03-12

Applicant: WEATHERFORD TECHNOLOGY HOLDINGS, LLC

Inventor： MORRISON, Jeffery ,  JACOB, Jobby T.

IPC: E21B17/10 ,  E21B33/129 ,  E21B17/1014 ,  E21B17/1078 ,  E21B33/1291 ,  E21B41/00

Abstract: A stop collar assembly includes a collar (116) having inner and outer surfaces. The inner surface includes a taper (150). The outer surface includes a slope (156). The stop collar assembly further includes a slip (118) having a bottom end and a taper (186) adjoining the bottom end. The slip taper is configured to contact the collar taper. When the collar taper (150) is in contact with the slip taper (186), a distance (SI) from a central radial axis of the collar to the start of the slope is less than a distance (SE1) from the central radial axis to the slip bottom end, and the distance (SE1) from the central radial axis to the slip bottom end is less than a distance (El) from the central radial axis to the end of the slope.

公开(公告)号：WO2021242910A2

公开(公告)日：2021-12-02

申请号：PCT/US2021/034330

申请日：2021-05-26

Applicant: WEATHERFORD TECHNOLOGY HOLDINGS, LLC

Inventor： GIROUX, Richard Lee ,  MORRISON, Jeffery ,  JACOB, Jobby T.

IPC: E21B33/14 ,  E21B34/10 ,  E21B2200/01 ,  E21B2200/06 ,  E21B33/146 ,  E21B34/108

Abstract: A stage cementing system (20) includes a stage cementing assembly (22) having a stage tool (24). The stage tool has an outer mandrel (62), an inner mandrel (64) coupled to and disposed inside of the outer mandrel, an annular chamber (66) between the outer mandrel and the inner mandrel, a first outer port (74) through the outer mandrel, and longitudinally spaced first (68) and second (70) inner ports through the inner mandrel. The stage cementing system further includes an inner string assembly (40) configured to be located inside the inner mandrel. The inner string assembly has a tubular body (104) including a central throughbore (106) and longitudinally spaced first (140) and second (156) side ports, a lower external seal element (120) below the first and second side ports, a middle external seal element (118) between the first and second side ports, and an upper external seal element (116) above the first and second side ports..