MULTI-STAGE WELL ISOLATION AND FRACTURING
An activation tool is provided for use in a well isolation and stimulation string, The activation tool has a stationary seat for receiving a ball deployed down the string, a stationary inner body, a stationary outer body and a moving sleeve positioned between the stationary inner and stationary outer bodies and movable from an open position to a closed position by force of the ball against the seat. A first stage frac valve tool is also provided having a stationary outer body and an internal piston movable between an closed and an open position. A singular tool is further provided having a float shoe, an activation tool and integrally built with the float shoe and a first stage frac integrally built with the activation tool. A cased hole packer is further provided having an integral setting tool.
1 . An activation tool for use in a well isolation and stimulation string, said activation tool comprising:
a. a stationary seat for receiving a ball deployed down the string;
b. a stationary inner body;
c. a stationary outer body; and
d. a moving sleeve positioned between the stationary inner and stationary outer bodies and movable from an open position to a closed position by force of the ball against the seat.
2 . The activation tool of claim 1 , wherein deployment of the ball onto the seat prevents circulation of liner fluid through the activation tool and re-directs fluid into a chamber formed between the stationary inner body and the moving sleeve, said fluid acting to move the sleeve.
3 . The activation tool of claim 2 , further comprising one or more shears screws affixing the stationary inner body to the moving sleeve, said shear screws being shearable at a predetermined liner fluid accumulated in the tool when the ball lands on the seat, wherein shearing of said one or more shear screws allows the moving sleeve to shift to the closed position.
4 . The activation tool of claim 1 , further comprising a collet connected to the moving sleeve to prevent retreat of the moving sleeve back to the open position from the set position.
5 . A first stage frac valve tool for use in a well stimulation string, said first stage frac valve tool comprising:
a. a stationary outer body; and
b. an internal piston movable between an closed and an open position.
6 . The first stage frac valve tool of claim 5 , wherein said tool is torqueable to torque values greater than those needed to make up the stimulation string.
7 . The first stage frac valve tool of claim 5 , further comprising one or more ports formed on the stationary outer body, said ports openable when the piston moves to the open position, to allow fluid to flow from inside the liner into a formation to be stimulated.
8 . The first stage frac valve tool of claim 7 , wherein the internal piston is moveable at a predetermined liner fluid pressure.
9 . The first stage frac valve tool of claim 8 , wherein liner pressure required to move the internal piston is greater than pack off pressure of one or more packers on the stimulation string.
10 . The first stage frac valve of claim 9 , further comprising one or more shear screws affixing the sleeve to the tool, said shear screws being shearable at the predetermined liner pressure to allow the internal piston to shift to the open position.
11 . The first stage frac valve tool of claim 10 , wherein the one or more shear screws are shearable at a first liner fluid pressure and the internal piston is movable at a second liner fluid pressure, wherein the first liner fluid pressure is greater than the second liner fluid pressure.
12 . The first stage frac valve tool of claim 5 , further comprising biasing means connected to the internal moveable piston to prevent retreat of the piston back to the closed position from the open position.
13 . The first stage frac valve tool of claim 12 , wherein the biasing means comprises a snap ring.
14 . The first stage frac valve tool of claim 7 , wherein the geometry of the one or more ports differentiates the appearance of the first stage frac valve tool from other valves installed on the liner.
15 . The first stage frac valve tool of claim 7 , wherein the one or more ports are sized to reduce ingress of wellbore debris into the liner.
16 . A singular tool comprising:
a. a float shoe;
b. an activation tool as described in claim 1 and integrally built with the float shoe; and
c. a first stage frac valve as described in claim 5 and integrally built with the activation tool.
17 . A cased hole packer comprising an integral setting tool.
18 . The cased hole packer of claim 17 , wherein the integral setting tool comprises one or more slips to activate the cased hole packer, wherein said slips are flush with an outside diameter of the cased hole packer.
19 . The cased hole packer of claim 18 , wherein the slips further comprise wickers formed on an outer surface of the slips, said ratchets engagable to a casing string inside diameter when the cased hole packer is set.
20 . The cased hole packer of claim 19 , further comprising a setting piston, moveable to set the cased hole packer from an unset to a set position.
21 . The cased hole packer of claim 17 , comprising a ratchet ring assembled on a mandrel body of the cased hole packer.
22 . The cased hole packer of claim 21 , wherein a piston is assembled overtop of the ratchet ring and mandrel body.
23 . The cased hole packer of claim 22 , wherein the setting piston comprises an integral locking body thread formed on an inner surface of at least a portion of the setting piston.
24 . The cased hole packer of claim 23 , wherein the ratchet ring comprises an inner surface ratchet profile that mates with a ratchet profile provided on at least part of the outer surface of the mandrel body and further comprises on outer surface ratchet profile that mates with the locking body thread.
25 . The cased hole packer of claim 24 , wherein orientation of the inner surface ratchet profile allows movement of the setting piston and ratchet ring along the mandrel body from an unset to a set position.
26 . The cased hole packer of claim 24 , wherein orientation of the outer surface ratchet profile allows assembly of the piston over the outer surface of the ratchet ring and serves to lock the ratchet ring to the setting piston during movement of the piston and ratchet ring from an unset to a set position.
27 . The cased hole packer of claim 21 , wherein the ratchet ring is assembled onto the mandrel body over one or more spring pins installed on the mandrel.
28 . The cased hole packer of claim 17 , comprising one or more anti-extrusion rings that remain flush with an outer surface of the open hole packer when the packer is unset.
29 . The cased hole packer of claim 28 , wherein the one or more anti-extrusion rings comprises two anti-extrusion rings, one on either side of a packing element of the cased hole packer, that serve to abut against the packing element in actuation.
30 . The cased hole packer of claim 29 , further comprising a backup rings positioned between each of the anti-extrusion rings and the packing element.
31 . The cased hole packer of claim 30 , wherein interaction of the one or more anti-rotation rings with their corresponding backup rings serves to prevent the single packing element from extruding internally and creeping.
32 . The cased hole packer of claim 31 , wherein the backup rings comprise a first contour into which upper and lower cones of the setting piston are engageable and comprise a second contour into which the anti-extrusion rings are engageable.
33 . The cased hole packer of claim 17 , comprising a single hydraulic packing element.
34 . The cased hole packer of claim 33 , wherein said single hydraulic packing element protrudes from an axial midpoint of said element when the packer is set.
35 . The cased hole packer of claim 34 , wherein the single packing element is thinner at its axial midpoint than at any other axial point on the single packing element.
36 . The cased hole packer of claim 35 , wherein the packing element is formed with a circumferential groove of predetermined width and depth around its inner surface at the axial midpoint.
37 . The cased hole packer of claim 36 , further comprising a packing element ring on the mandrel body onto which the packing element groove sits.
38 . The cased hole packer of claim 17 , wherein the cased hole packer is deployed in a work string by use of a tie back receptacle.
39 . The cased hole packer of claim 38 , wherein the work string is selected from the group consisting of a drill string and a frac string.
40 . The cased hole packer of claim 17 , further comprising one or more grooves formed circumferentially around the cased hole packer, to receive a pressure test clamp, said clamp allowing pressure testing of the cased hole packer while preventing setting of the cased hole packer.
41 . The cased hole packer of claim 17 , wherein the cased hole packer is attached to a jay type latch seal assembly for deployment on a work string.
42 . The cased hole packer of claim 17 , wherein the cased hole packer is attached to a collet type latch seal assembly for deployment on a work string.
43 . The cased hole packer of claim 17 , wherein the cased hole packer is threaded directly to a work string.