Multi-functional isolation tool and method of use
First Claim
Patent Images
1. A completion tool for deployment within a wellbore on tubing string, the assembly comprising:
- upper and lower sealing members defining a straddle zone between the upper and lower sealing members;
one or more treatment ports within the straddle zone, the treatment ports continuous with tubing string to allow fluid delivery to the wellbore from surface;
a valve housing mounted beneath the lower sealing member, the valve housing defining a fluid passageway continuous with the tubing string and with the wellbore annulus beneath the lower sealing member to allow pressure equalization therebetween;
a bypass plug slidable within the valve housing between an open position in which fluid passage through the housing is permitted, and a sealed position in which fluid passage through the housing is prevented, the plug actuable to open or to seal the passageway upon application of mechanical pressure to the tubing string; and
a resettable anchor device operatively mounted beneath the lower sealing member for setting against the casing of a wellbore, the anchor device operable by application of mechanical force to the tubing string.
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Accused Products
Abstract
A tool assembly and method for completing a well are provided. The tool is deployed on tubing string and includes a fluid treatment assembly with cup seals above and below the treatment ports. An equalization valve beneath the fracturing assembly can be opened or closed to control fluid passage between the coiled tubing and treatment zone to the wellbore below.
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Citations
27 Claims
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1. A completion tool for deployment within a wellbore on tubing string, the assembly comprising:
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upper and lower sealing members defining a straddle zone between the upper and lower sealing members; one or more treatment ports within the straddle zone, the treatment ports continuous with tubing string to allow fluid delivery to the wellbore from surface; a valve housing mounted beneath the lower sealing member, the valve housing defining a fluid passageway continuous with the tubing string and with the wellbore annulus beneath the lower sealing member to allow pressure equalization therebetween; a bypass plug slidable within the valve housing between an open position in which fluid passage through the housing is permitted, and a sealed position in which fluid passage through the housing is prevented, the plug actuable to open or to seal the passageway upon application of mechanical pressure to the tubing string; and a resettable anchor device operatively mounted beneath the lower sealing member for setting against the casing of a wellbore, the anchor device operable by application of mechanical force to the tubing string. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A completion tool for deployment within a wellbore on tubing string, the assembly comprising:
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a straddle assembly comprising upper and lower sealing members defining a straddle zone; one or more treatment ports within the straddle zone of the straddle assembly, the treatment ports continuous with tubing string to allow fluid delivery to the wellbore from surface; a jet perforation device operatively attached below the straddle assembly, the jet perforation device comprising a tubular having one or more jet perforation nozzles continuous with the tubing string; a valve housing between the straddle assembly and the jet perforation device, the valve housing defining a fluid passageway between the straddle assembly and the jet perforation device; a bypass plug slidable within the valve housing between an open position in which fluid passage through the housing to the jet perforation device is permitted, and a sealed position in which fluid passage through the housing is prevented, the plug actuable to open or to seal the passageway upon application of mechanical pressure to the tubing string. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for treating a wellbore, the method comprising the steps of:
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providing a tool assembly comprising;
upper and lower sealing members mounted along a mandrel, defining a straddle zone between the upper and lower sealing members;
one or more treatment ports within the straddle zone for delivery of treatment fluid to the wellbore from the tubing string;
a valve housing mounted beneath the lower sealing member, the valve housing defining a fluid passageway continuous with the tubing string and with the wellbore annulus beneath the lower sealing member to allow pressure equalization therebetween;
a bypass plug slidable within the valve housing between an open position in which fluid passage through the housing is permitted, and a sealed position in which fluid passage through the housing is prevented, the plug actuable to open or to seal the passageway upon application of a mechanical force to the tubing string; and
a resettable anchor device operatively mounted beneath the lower sealing member for engaging the casing of a wellbore, the anchor device operable by application of mechanical force to the tubing string;locating the completion tool downhole at a position in which the upper and lower sealing members straddle a casing perforation to be treated; sealing the fluid passageway through the valve housing; applying mechanical force to the tubing string to set the anchor against the casing; and applying treatment fluid to the tubing string to isolate and treat the perforation. - View Dependent Claims (16, 17, 18)
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19. A method for treating a wellbore, the method comprising the steps of:
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providing a completion tool comprising;
a straddle assembly comprising upper and lower sealing members defining a straddle zone;
one or more treatment ports within the straddle zone, the treatment ports continuous with tubing string to allow fluid delivery through the treatment ports from surface;
a jet perforation device operatively attached below the straddle assembly, the jet perforation device comprising a tubular having one or more jet perforation nozzles continuous with the tubing string;
a valve housing between the straddle assembly and the jet perforation device, the valve housing defining a fluid passageway between the straddle assembly and the jet perforation device; and
a bypass plug for reversibly sealing the fluid passage through the housing, the plug operable upon application of mechanical pressure to the tubing string;locating the completion tool downhole adjacent a zone of interest; and applying fluid to the tubing string. - View Dependent Claims (20, 21, 22)
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23. A method for perforating and treating a wellbore, the method comprising the steps of:
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providing a tool assembly deployed on tubing string, the tool assembly comprising a straddle isolation device, a sand jet perforating device, and a fluid bypass valve between the isolation tool and the sand jet perforating device; setting the straddle isolation device downhole about a perforation to be treated; pumping fluid down the tubing string with the bypass valve closed, to prevent said fluid from reaching the jet perforation device; once treatment of the perforation is complete, opening the bypass valve to allow hydraulic pressure to be dissipated across the straddle device. - View Dependent Claims (24, 25, 26, 27)
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Specification