CN102418495A - Under-balanced downhole casing valve plate and machining method thereof - Google Patents
Under-balanced downhole casing valve plate and machining method thereof Download PDFInfo
- Publication number
- CN102418495A CN102418495A CN201010294714XA CN201010294714A CN102418495A CN 102418495 A CN102418495 A CN 102418495A CN 201010294714X A CN201010294714X A CN 201010294714XA CN 201010294714 A CN201010294714 A CN 201010294714A CN 102418495 A CN102418495 A CN 102418495A
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- valve plate
- valve
- cylinder
- camcylinder
- downhole casing
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- 238000000034 method Methods 0.000 title abstract description 10
- 238000003754 machining Methods 0.000 title abstract 3
- 238000003672 processing method Methods 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention discloses an underbalanced downhole casing valve plate and a machining method thereof. The valve plate is an intersection body of an eccentric cylinder and the inner parts of two cylindrical surfaces, and the processing method comprises the steps of taking a cylindrical blank, fixing an inner cylinder, and turning the cylindrical blank to obtain the diameter size of an eccentric annular excircle; fixing the outer cylinder, and boring the diameter size of an eccentric annular inner circle by a rotary cutter; spot welding a tool on the outer surface, clamping the tool by using a chuck, and rotating the valve plate of the valve plate lathe to form an arched outer edge; the overturning tool is clamped by the chuck, and the valve plate is rotated to turn out the circular outer edge of the valve plate. The eccentric structure of the valve plate leaves more space for subsequent processing of the outer surface and the side surface of the top part, simultaneously increases the overall thickness of the valve plate and can bear higher well bottom pressure; the valve plate can be machined only by common rotation, and the machining method is simple, convenient and feasible.
Description
Technical field
The present invention relates to a kind of underbalance downhole casing valve valve plate and processing method thereof, belong to oil drilling downhole tool field.
Background technology
In order to protect oil-gas Layer better, each oily company requires in the whole process of opening the end of oil reservoir to completion, all will keep the under-balanced state in shaft bottom, said overall process under-balance technology that Here it is.The down-hole isolation technology that adopts casing valve is to realize the simplest and the most direct, the safe technology of overall process under-balance drilling, so down hole sleeve valve begins to obtain wide popularization and application.
Down hole sleeve valve is a kind of sleeve pipe stop valve of full pit shaft, and the ingredient that can be used as protective casing is lowered to and is solid in well.When needing to pull out of hole in the under balance pressure drilling process, at first the drilling tool band has been pressed to be drilled into more than the down hole sleeve valve, close valve plate then, release the pressure of upper sleeve, pull out of hole according to conventional method; Under when boring, during down to the valve plate top, at first close ground pressure control system by conventional method, pump into fluid with balance valve plate pressure up and down from well head, open valve plate then, band is depressed and is got into the shaft bottom and carry out underbalance and creep into.
Down hole sleeve valve is by urceolus, the slides within mandrel, and valve plate, valve seat and valve plate resetting-mechanism are formed.Urceolus is hollow cylindrical shell, and is connected with conventional cannula through last lower contact; The slip mandrel is equipped with on urceolus top, and slip mandrel and urceolus and the sealing ring that is installed on urceolus form Hollow hydraulic cylinder, and drilling tool can pass from the mandrel endoporus; The urceolus external process has two hydraulic fluid ports up and down, in hydraulic fluid port, injects hydraulic oil by ground control system, drives the slip mandrel and under action of hydraulic force, moves up and down, and opens or closes valve plate.
Oil gas and the pressure of valve plate under in off position can barrier wells guarantees the well head safe operation; Allow BHA to pass through in opening.Valve plate is the critical component of down hole sleeve valve, and the feasibility of its design rationality and processing is the key of casing valve development, is related to the technical performance and the processing cost of casing valve.At present, still have nothing to do in the document record of underbalance downhole casing valve valve plate and processing method thereof.
Summary of the invention
One of the object of the invention just provides a kind of underbalance downhole casing valve valve plate.
Two of the object of the invention just provides a kind of processing method of underbalance downhole casing valve valve plate.
One of the object of the invention is achieved in that a kind of underbalance downhole casing valve valve plate is that the friendship body is cut in the inside on a camcylinder and two faces of cylinder; Wherein a face of cylinder is perpendicular to the camcylinder plane of symmetry; Cut to hand over the body projection to be one arc; Another face of cylinder axis of rotation on the plane of symmetry of camcylinder and with the camcylinder axis normal, cut to hand over the projection of body to be a circle.
Two of the object of the invention is achieved in that a kind of processing method of underbalance downhole casing valve valve plate, may further comprise the steps:
(1) get cylindric blank, fixedly inner core rotates the diameter dimension that blank vehicle goes out the cylindrical of eccentric annular;
(2) fixed outer cylinder, rotary cutter bore the interior diameter of a circle size of eccentric annular;
(3) surperficial outside spot welding one frock is used the chuck clamping tool, and rotary valve wooden handcart valve plate side forms arcuate outer edges;
(4) the upset frock clamps with chuck, and the rotary valve wooden handcart goes out the circular outer rim of valve plate.
The present invention has the following advantages: the eccentric structure of (1) valve plate has reserved more space for the following process of external surface and top-side, has also increased the whole thickness of valve plate simultaneously, can bear higher bottom pressure.(2) valve plate is that cutting of camcylinder and two faces of cylinder handed over body, only needs rotary processing just can realize that simple and convenient processing method is feasible.
Description of drawings
Fig. 1 is the axis projection view of a kind of underbalance downhole casing valve valve plate of the present invention.
Fig. 2 is that the A of a kind of underbalance downhole casing valve valve plate of the present invention is to projection view.
Fig. 3 is that the B of a kind of underbalance downhole casing valve valve plate of the present invention is to the complete section projection view.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further described:
Embodiment 1: a kind of underbalance downhole casing valve valve plate; It is that a camcylinder (exradius R1, interior radius of circle R2, eccentric throw R12) cuts the friendship body with the inside on two faces of cylinder; Wherein a face of cylinder (radius R 3) is perpendicular to the plane of symmetry of camcylinder; Cut to hand over the body projection to be one arc, another face of cylinder (diameter D) rotation on the camcylinder plane of symmetry and with the camcylinder axis normal, cut and hand over the projection of body to be a circle.
Embodiment 2: process for the underbalance downhole casing valve valve plate, specifically may further comprise the steps:
(1) get cylindric blank, fixedly inner core rotates the radius size R1 that blank vehicle goes out the cylindrical of eccentric annular;
(2) fixed outer cylinder, rotary cutter bore the interior radius of a circle size R2 of eccentric annular;
(3) surperficial outside spot welding one frock is used the chuck clamping tool, and rotary valve wooden handcart valve plate side forms arcuate outer edges radius R 3;
(4) the upset frock clamps with chuck, and the rotary valve wooden handcart goes out the circular external profile diameter D of valve plate.
Claims (2)
1. underbalance downhole casing valve valve plate; It is characterized in that it is that the friendship body is cut in the inside on a camcylinder and two faces of cylinder; Wherein a face of cylinder is perpendicular to the camcylinder plane of symmetry; Cut to hand over the body projection to be one arc, another face of cylinder axis of rotation on the plane of symmetry of camcylinder and with the camcylinder axis normal, cut and hand over the projection of body to be a circle.
2. the processing method of an a kind of underbalance downhole casing valve valve plate as claimed in claim 1 is characterized in that may further comprise the steps:
(1) get cylindric blank, fixedly inner core rotates the diameter dimension that blank vehicle goes out the cylindrical of eccentric annular;
(2) fixed outer cylinder, rotary cutter bore the interior diameter of a circle size of eccentric annular;
(3) surperficial outside spot welding one frock is used the chuck clamping tool, and rotary valve wooden handcart valve plate side forms arcuate outer edges;
(4) the upset frock clamps with chuck, and the rotary valve wooden handcart goes out the circular outer rim of valve plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010294714.XA CN102418495B (en) | 2010-09-28 | 2010-09-28 | Under-balanced underground casing valve plate and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010294714.XA CN102418495B (en) | 2010-09-28 | 2010-09-28 | Under-balanced underground casing valve plate and processing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102418495A true CN102418495A (en) | 2012-04-18 |
| CN102418495B CN102418495B (en) | 2014-11-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010294714.XA Active CN102418495B (en) | 2010-09-28 | 2010-09-28 | Under-balanced underground casing valve plate and processing method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN102418495B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983803A (en) * | 1989-09-07 | 1991-01-08 | Camco International Inc. | Method of making a subsurface well safety valve |
| WO1998059150A2 (en) * | 1997-06-24 | 1998-12-30 | Camco International Inc. | Method of manufacturing a curved flapper |
| US6227299B1 (en) * | 1999-07-13 | 2001-05-08 | Halliburton Energy Services, Inc. | Flapper valve with biasing flapper closure assembly |
| US6666271B2 (en) * | 2001-11-01 | 2003-12-23 | Weatherford/Lamb, Inc. | Curved flapper and seat for a subsurface saftey valve |
| CN2698966Y (en) * | 2004-05-26 | 2005-05-11 | 中国石化集团胜利石油管理局钻井工艺研究院 | Hydraulic down-hole casing valve for under balance drilling |
| US20080035353A1 (en) * | 2006-08-14 | 2008-02-14 | William James Hughes | Flapper Valve and Actuator |
-
2010
- 2010-09-28 CN CN201010294714.XA patent/CN102418495B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983803A (en) * | 1989-09-07 | 1991-01-08 | Camco International Inc. | Method of making a subsurface well safety valve |
| WO1998059150A2 (en) * | 1997-06-24 | 1998-12-30 | Camco International Inc. | Method of manufacturing a curved flapper |
| US6227299B1 (en) * | 1999-07-13 | 2001-05-08 | Halliburton Energy Services, Inc. | Flapper valve with biasing flapper closure assembly |
| US6666271B2 (en) * | 2001-11-01 | 2003-12-23 | Weatherford/Lamb, Inc. | Curved flapper and seat for a subsurface saftey valve |
| CN2698966Y (en) * | 2004-05-26 | 2005-05-11 | 中国石化集团胜利石油管理局钻井工艺研究院 | Hydraulic down-hole casing valve for under balance drilling |
| US20080035353A1 (en) * | 2006-08-14 | 2008-02-14 | William James Hughes | Flapper Valve and Actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102418495B (en) | 2014-11-05 |
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