Collett Catcher Sub

Collet Catcher Subs

The Collet Catcher Sub is installed in the tubing string below a hydraulically actuated tool such as a hydrostatic packer to provide a method of applying the tubing pressure required to activate the tool.

Operation

To set a hydrostatic packer, a ball is circulated through the tubing and packer to the Sub, and sufficient tubing pressure is applied to activate the setting mechanism in the packer. After the packer is set, a pressure increase to approximately 2,500 psi (17, 23 MPa) shears screws to allow the ball seat to move down until the fingers snap back into the groove. The sub is then full opening, and the ball passes on the down tubing.

Pump Out Pressures

Size	2 ⅜"	2 ⅞"	3 ½"
Area of Seat	3.14 sq/in	4.91 sq/in	5.94 sq/in
# of Screws	Pump Out Pressure (PSI)	Pump Out Pressure (PSI)	Pump Out Pressure (PSI)
3	1485	1806	1794
4	1980	2408	2392
5	2475	3010	2990
6	2970	3612	3588
7	3465	4214	4186
8	3960	4816	4784
9	4455	5418	5382
10	4950	6020	5980

Parts List (see diagram)

Item #	Description	2 ⅜" (Qty)	2 ⅞" (Qty)	3 ½" (Qty)
1	Top Sub	1	1	1
2	Ball	1 (1 ¾)	1 (2 ⅛)	1 (2 ½)
3	Seat	1	1	1
4	Collet	1	1	1
5	Set Screw	1 (1/4-20 x 3/16)	1 (1/4-20 x 3/16)	1 (1/4-20 x 3/16)
6	O-Ring	1 (#037)	1 (special)	1 (#044)
7	Shear Screws	5	4	1
8	Bottom Sub	1	1	1

Dimensions (see diagram)

Size	A	B	C	D	E	ID Before	ID After
2 ⅜"	3 ¹⁄₉	1.91	1.91	6	4	1.5	1.91
2 ⅞"	3 ⅔	2.35	2.35	6	4	2	2.35
3 ½"	4 ¼"	2.78	2.92	8.5	4.75	2.38	2.78

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