Well treatment fluid placement tool and methods
First Claim
1. A tool for placing a treatment fluid in a subterranean formation penetrated by a well bore by way of selected perforations extending from casing cemented in the well bore into the formation, comprising:
- an elongated inner mandrel having an axial fluid flow passageway therethrough adapted to be connected at one end to tubing or a pipe string and having at least one lateral fluid flow port therein, said inner mandrel also including an outer shoulder formed thereon and a lateral fluid passage extending from said axial fluid flow passageway to the exterior of said inner mandrel near said shoulder;
at least one resilient self expandable cup type packer for providing a seal between said inner mandrel and said casing in said well bore attached to said inner mandrel between said outer shoulder on said inner mandrel and said lateral fluid flow port therein;
a tubular piston member slidably extending over said inner mandrel and over said cup type packer attached thereto having an inner shoulder formed therein which is complimentary to said outer shoulder on said inner mandrel whereby fluid pressure exerted between said shoulders by way of said lateral passage and said axial fluid flow passageway of said inner mandrel moves said piston member from a first position whereby said cup type packer is covered and compressed inwardly by said tubular piston member to a second position whereby said cup type packer is uncovered by said tubular piston member;
first shearable means attached between said inner mandrel and said tubular piston member for maintaining said tubular piston member in said first position until a predetermined fluid pressure is exerted between said shoulders of said inner mandrel and said piston member;
a sleeve valve having an annular seat formed thereon for receiving a closing plug slidably disposed within said fluid flow passageway of said inner mandrel whereby when fluid pressure is exerted on said sleeve valve with said closing plug seated thereon, said sleeve valve moves from a first position whereby said lateral fluid flow port of said inner mandrel is closed to a second position whereby said lateral fluid flow port is open; and
second shearable means attached between said sleeve valve and said inner mandrel for maintaining said sleeve valve in said first position until a predetermined fluid pressure is exerted on said sleeve valve.
1 Assignment
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Accused Products
Abstract
The present invention provides a tool and methods of placing a treatment fluid in a subterranean formation penetrated by a well bore by way of selected perforations extending from casing cemented in the well bore into the formation. The fluid placement tool includes a fluid flow passageway extending therethrough, at least one resilient self expandable cup type packer attached thereto and a valve disposed in the fluid flow passageway which closes the passageway when a closing plug is dropped into the tool. The placement tool is capable of releasing the cup type packer whereby it provides a seal between the tool and the casing when a first predetermined fluid pressure is applied to the tool after a closing plug is dropped therein and opening the fluid flow passageway whereby the treatment fluid is discharged from the tool below the packer when the fluid pressure is increased to a second predetermined fluid pressure. Methods of using the tool are also provided.
74 Citations
20 Claims
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1. A tool for placing a treatment fluid in a subterranean formation penetrated by a well bore by way of selected perforations extending from casing cemented in the well bore into the formation, comprising:
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an elongated inner mandrel having an axial fluid flow passageway therethrough adapted to be connected at one end to tubing or a pipe string and having at least one lateral fluid flow port therein, said inner mandrel also including an outer shoulder formed thereon and a lateral fluid passage extending from said axial fluid flow passageway to the exterior of said inner mandrel near said shoulder; at least one resilient self expandable cup type packer for providing a seal between said inner mandrel and said casing in said well bore attached to said inner mandrel between said outer shoulder on said inner mandrel and said lateral fluid flow port therein; a tubular piston member slidably extending over said inner mandrel and over said cup type packer attached thereto having an inner shoulder formed therein which is complimentary to said outer shoulder on said inner mandrel whereby fluid pressure exerted between said shoulders by way of said lateral passage and said axial fluid flow passageway of said inner mandrel moves said piston member from a first position whereby said cup type packer is covered and compressed inwardly by said tubular piston member to a second position whereby said cup type packer is uncovered by said tubular piston member; first shearable means attached between said inner mandrel and said tubular piston member for maintaining said tubular piston member in said first position until a predetermined fluid pressure is exerted between said shoulders of said inner mandrel and said piston member; a sleeve valve having an annular seat formed thereon for receiving a closing plug slidably disposed within said fluid flow passageway of said inner mandrel whereby when fluid pressure is exerted on said sleeve valve with said closing plug seated thereon, said sleeve valve moves from a first position whereby said lateral fluid flow port of said inner mandrel is closed to a second position whereby said lateral fluid flow port is open; and second shearable means attached between said sleeve valve and said inner mandrel for maintaining said sleeve valve in said first position until a predetermined fluid pressure is exerted on said sleeve valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A tool for placing a treatment fluid in a subterranean formation penetrated by a well bore by way of selected perforations extending from casing cemented in the well bore into the formation, comprising:
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an elongated cylindrical inner mandrel having an upper end and a lower end, having a fluid flow passageway therethrough, having at least one lateral fluid flow port therein and being adapted at said upper end to be connected to tubing or a pipe string, said inner mandrel also including an outer shoulder formed thereon and a lateral fluid passage extending from said axial fluid flow passageway to the exterior of said inner mandrel above said shoulder; two resilient self expandable cup type packers for providing a seal between said inner mandrel and said casing in said well bore attached to said inner mandrel below said outer shoulder on said inner mandrel; a tubular piston member slidably extending over said inner mandrel and over said cup type packers attached thereto having an inner shoulder formed therein which is above and complimentary to said outer shoulder on said inner mandrel whereby fluid pressure exerted between said shoulders by way of said lateral passage and said axial fluid flow passageway of said inner mandrel moves said piston member upwardly from a first position whereby said cup type packers are covered and compressed inwardly by said tubular piston member to a second position whereby said cup type packers are uncovered by said tubular piston member; means for retaining said tubular piston member in its second position after said tubular piston member is moved thereto attached to said tubular piston member and to said inner mandrel; at least one shear pin attached between said inner mandrel and said tubular piston member for maintaining said tubular piston member in said first position until a predetermined fluid pressure is exerted between said shoulders of said inner mandrel and said piston member; a sleeve valve having an annular seat formed thereon for receiving a closing plug slidably disposed within said fluid flow passageway of said inner mandrel above said lateral fluid flow port therein whereby when fluid pressure is exerted on said sleeve valve with said closing plug seated thereon, said sleeve valve moves from a first position above said lateral fluid flow port of said inner mandrel whereby said lateral fluid flow port is closed to a second position below said lateral fluid flow port whereby said lateral fluid flow port is open; and at least one shear pin attached between said sleeve valve and said inner mandrel for maintaining said sleeve valve in said first position until a predetermined fluid pressure is exerted on said sleeve valve. - View Dependent Claims (10)
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11. A method of placing a treatment fluid in a selected portion of a producing interval in a subterranean formation penetrated by a well bore and by a plurality of perforations extending from casing cemented in the well bore into the producing interval, comprising the steps of:
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(a) connecting a fluid placement tool to tubing or a pipe string, said fluid placement tool having a fluid flow passageway extending therethrough, having at least one resilient self expandable cup type packer attached thereto and having a valve disposed in said fluid flow passageway which closes said fluid flow passageway when a closing plug is dropped into said tool, said placement tool being capable of releasing said cup type packer whereby it provides a seal between said tool and said casing when a first predetermined fluid pressure is applied to said tool after a closing plug is dropped into said tool and opening said fluid flow passageway whereby said treatment fluid is discharged from said tool below said packer when said fluid pressure is increased to a second predetermined fluid pressure; (b) lowering said tool and said tubing or pipe string in said well bore to said formation and dropping a closing plug into said tool whereby said valve and said fluid flow passageway of said tool are closed; (c) increasing the fluid pressure exerted on said tool to said first predetermined fluid pressure whereby said cup type packer is released; (d) positioning said tool whereby said packer is above a selected set or group of said perforations; and (e) increasing said fluid pressure exerted on said tool to said second predetermined fluid pressure whereby said fluid flow passageway is opened and said treatment fluid is placed in the portion of said producing interval penetrated by said selected perforations. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification