Patent ID: 9574421
Date: 2017-02-21
CPC Classifications: E21B

Claim:
1. A frac sleeve comprising: an outer sidewall with an inner diameter and an outer diameter, a hollow chamber being formed within the inner diameter; an inner sleeve configured to be positioned adjacent to the inner diameter of the outer sidewall, wherein the inner sleeve is configured to move along a longitudinal axis of the frac sleeve; a vertically adjustable member positioned within the outer sidewall, the vertically adjustable member being configured to be compressed and extended to move the inner sleeve along the longitudinal axis; an expandable ball seat configured to be positioned within the hollow chamber, and configured to selectively secure a frac-ball in place, the expandable ball seat having an open inner diameter, the open inner diameter having a variable length, wherein the frac-ball has a first diameter, and when the frac-ball is positioned on the expandable ball seat the open inner diameter of the expandable ball seat has a second diameter, the first diameter being greater than the second diameter, wherein when the frac-ball is positioned on the expandable ball seat, pressure within the hollow chamber increases to compress the vertically adjustable member; an outer frac port extending through the outer sidewall; an inner frac port extending through the inner sleeve, the outer frac port and the inner frac port being configured to be misaligned when the vertically adjustable member is extended a first length, and the outer frac port and the inner frac port are configured to be aligned when the vertically adjustable member is compressed, wherein when the outer frac port and the inner frac port are aligned a first passageway is formed from the hollow chamber to an area outside of the frac sleeve through the outer frac port and inner frac port; a ring locking mechanism positioned on the outer sidewall, the ring locking mechanism being a recess on the outer sidewall extending from the inner diameter towards the outer diameter.