CA2721468C - Dual directional downhole overpressure valve - Google Patents
Dual directional downhole overpressure valve Download PDFInfo
- Publication number
- CA2721468C CA2721468C CA2721468A CA2721468A CA2721468C CA 2721468 C CA2721468 C CA 2721468C CA 2721468 A CA2721468 A CA 2721468A CA 2721468 A CA2721468 A CA 2721468A CA 2721468 C CA2721468 C CA 2721468C
- Authority
- CA
- Canada
- Prior art keywords
- valve
- valve body
- force
- recesses
- mid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000009977 dual effect Effects 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 description 9
- 239000004568 cement Substances 0.000 description 5
- 238000005553 drilling Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Lift Valve (AREA)
- Safety Valves (AREA)
Abstract
Dual directional downhole overpressure valve (1) comprising a valve housing (2) and where a first valve body (4) is forced with a first force against a first valve seat (8), and where a second valve body (6) is forced against a second valve seat (26) positioned in the first valve body (4) with a force smaller than the first force, the first force and the second force acting in opposite directions.
Description
DUAL DIRECTIONAL DOWNHOLE OVERPRESSURE VALVE
This invention relates to a dual directional downhole over-pressure valve. More particularly it concerns a dual direc-tional downhole overpressure valve comprising a valve housing and where a first valve body is forced against a first valve seat by a force. A second valve body is forced against a sec-ond valve seat positioned in the first valve body by a second force being less than the first force, the first and the sec-ond force acting in opposite directions.
io The dual directional downhole overpressure valve is, for the sake of simplicity, below denoted "valve".
During some downhole operations, especially in connection with petroleum exploitation, it is desirable to be able to lead a fluid controlled in both directions through a valve.
An example of such an operation is when a cement plug is to be set and a certain quantity of cement shall be transported down into a borehole and be placed in a space in the bore-hole.
It would then be advantageous if a tool comprising the valve and a pipe portion could be filled from the underside of the valve and up through the valve to the pipe portion where the cement remained during the transport down into the borehole.
After the tool had been placed at the cementing location, the
This invention relates to a dual directional downhole over-pressure valve. More particularly it concerns a dual direc-tional downhole overpressure valve comprising a valve housing and where a first valve body is forced against a first valve seat by a force. A second valve body is forced against a sec-ond valve seat positioned in the first valve body by a second force being less than the first force, the first and the sec-ond force acting in opposite directions.
io The dual directional downhole overpressure valve is, for the sake of simplicity, below denoted "valve".
During some downhole operations, especially in connection with petroleum exploitation, it is desirable to be able to lead a fluid controlled in both directions through a valve.
An example of such an operation is when a cement plug is to be set and a certain quantity of cement shall be transported down into a borehole and be placed in a space in the bore-hole.
It would then be advantageous if a tool comprising the valve and a pipe portion could be filled from the underside of the valve and up through the valve to the pipe portion where the cement remained during the transport down into the borehole.
After the tool had been placed at the cementing location, the
2 cement could flow in the opposite direction through the valve and into the space to be cemented.
The task may be solved by placing two overpressure valves having different opening directions in parallel runs in a valve housing. However, such a solution requires a relatively large space and is not well suited for potential subsequent boring of the valve.
The object of the invention is to remedy or reduce at least one of the prior art drawbacks.
io The object is achieved according to the invention by the fea-tures stated in the description below and in the following claims.
A dual directional downhole overpressure valve in accordance with the invention comprises a valve housing and a first valve body, which is forced against a first valve seat by a first force, and is characterized in that a second valve body is forced against a second valve seat positioned in the first valve body with a second force which is less than the first force, the first and second force acting in opposite direc-tions.
The first and the second valve body span between their re-spective valve seats and a first holder and second holder re-spectively where both holders are connected to the valve housing.
The mid portions of the valve bodies are formed with a rela-tively thin walled, preferably barrel-.like shape, where a number of longitudinal and through recesses are arranged. By the term barrel-like shape is meant a shape wherein the mid portion is made up of areas with different diameters. An in-verted barrel like shape, wherein the diameter in a mid por-
The task may be solved by placing two overpressure valves having different opening directions in parallel runs in a valve housing. However, such a solution requires a relatively large space and is not well suited for potential subsequent boring of the valve.
The object of the invention is to remedy or reduce at least one of the prior art drawbacks.
io The object is achieved according to the invention by the fea-tures stated in the description below and in the following claims.
A dual directional downhole overpressure valve in accordance with the invention comprises a valve housing and a first valve body, which is forced against a first valve seat by a first force, and is characterized in that a second valve body is forced against a second valve seat positioned in the first valve body with a second force which is less than the first force, the first and second force acting in opposite direc-tions.
The first and the second valve body span between their re-spective valve seats and a first holder and second holder re-spectively where both holders are connected to the valve housing.
The mid portions of the valve bodies are formed with a rela-tively thin walled, preferably barrel-.like shape, where a number of longitudinal and through recesses are arranged. By the term barrel-like shape is meant a shape wherein the mid portion is made up of areas with different diameters. An in-verted barrel like shape, wherein the diameter in a mid por-
3 tion is smaller, may also be considered suitable. Neither is it necessary that the barrel like shaped section is built up of curved lines,`as the section may be built up by any suit-able combination of lines.
This barrel like shape combined with said recesses causes the mid portions of the valve bodies to constitute an axial spring. The recesses also serve as flow-through openings dur-ing fluid flow through the valve.
The spring force of the two valve bodies is different, as the mid portion of the first valve body is formed with fewer re-cesses than the mid portion of the second valve body.
Advantageously, at least the second valve body is made from a synthetic material or a metal, which is relatively simple to remove e.g. by drilling.
A valve according to the invention provides a relatively sim-ple, space-saving and inexpensive solution to a well-known problem. The valve may be controlled by fluid pressure and is thus independent of e.g. electric control cables.
In the following is described an example of a preferred em-bodiment illustrated in the enclosed drawings, where:
Fig. 1 shows a longitudinal section of a valve in accordance with the invention in a closed position;
Fig. 2 shows the valve of fig. 1 where the body of second valve is displaced from a second valve seat; and Fig. 3 shows the valve of fig. 1 where the body of the first valve is displaced from a first valve seat.
This barrel like shape combined with said recesses causes the mid portions of the valve bodies to constitute an axial spring. The recesses also serve as flow-through openings dur-ing fluid flow through the valve.
The spring force of the two valve bodies is different, as the mid portion of the first valve body is formed with fewer re-cesses than the mid portion of the second valve body.
Advantageously, at least the second valve body is made from a synthetic material or a metal, which is relatively simple to remove e.g. by drilling.
A valve according to the invention provides a relatively sim-ple, space-saving and inexpensive solution to a well-known problem. The valve may be controlled by fluid pressure and is thus independent of e.g. electric control cables.
In the following is described an example of a preferred em-bodiment illustrated in the enclosed drawings, where:
Fig. 1 shows a longitudinal section of a valve in accordance with the invention in a closed position;
Fig. 2 shows the valve of fig. 1 where the body of second valve is displaced from a second valve seat; and Fig. 3 shows the valve of fig. 1 where the body of the first valve is displaced from a first valve seat.
4 In the drawings, the reference numeral 1 indicates a dual di-rectional downhole overpressure valve comprising a valve housing 2, a first valve body 4 and a second valve body 6.
The valve housing 2, which may be a part of an adjacent pipe portion, is shaped inside with a first valve seat 8 in the form of a conical parapet in the wall of the valve housing 2.
The first valve body 4 is clamped in the valve housing 1 be-tween the first valve seat 8 and a first holder 10 which is screwed into the first bore 12 of the valve housing 1, the first holder 10 being formed with a central bore 14 there-through.
The first valve body 4 comprises a central bore 16 there-through, into which the guide bushing 18 of the first holder 10 displaceably extends. At the first valve seat 8, the first valve body 4 is formed with an outside diameter being some-what smaller than a second bore 20 of the valve housing 2.
The second bore 20 has a somewhat larger diameter than the first bore 12.
At its mid-portion 22, the first valve body 4 is allocated a relatively thin-walled barrel-shaped portion. The mid-portion 22 is provided with a number of longitudinal recesses 24 sur-rounding the central through opening 16.
The function of the recesses 24 is dual. The recesses 24 pro-vide a flow path between the through opening 16 and an annu-lus 25 between the first valve body 4 and the valve housing 2. Further, the recesses 24 weakens the axial strength of the barrel-shaped mid-portion 22, as the mid-portion 22 thereby constitutes a spring which under axial loading is resilient shortened coincident with a resilient deflection of the mate-rial in the mid-portion 22 between the recesses 24.
RECTIFIED SHEET (RULE 91) The closing power of the first valve body 4 against the first valve seat 8 is thus among other tings determined by the num-ber of recesses 24 in the mid-portion 22, the wall thickness, and by the relative distance of the first holder 10 to the
The valve housing 2, which may be a part of an adjacent pipe portion, is shaped inside with a first valve seat 8 in the form of a conical parapet in the wall of the valve housing 2.
The first valve body 4 is clamped in the valve housing 1 be-tween the first valve seat 8 and a first holder 10 which is screwed into the first bore 12 of the valve housing 1, the first holder 10 being formed with a central bore 14 there-through.
The first valve body 4 comprises a central bore 16 there-through, into which the guide bushing 18 of the first holder 10 displaceably extends. At the first valve seat 8, the first valve body 4 is formed with an outside diameter being some-what smaller than a second bore 20 of the valve housing 2.
The second bore 20 has a somewhat larger diameter than the first bore 12.
At its mid-portion 22, the first valve body 4 is allocated a relatively thin-walled barrel-shaped portion. The mid-portion 22 is provided with a number of longitudinal recesses 24 sur-rounding the central through opening 16.
The function of the recesses 24 is dual. The recesses 24 pro-vide a flow path between the through opening 16 and an annu-lus 25 between the first valve body 4 and the valve housing 2. Further, the recesses 24 weakens the axial strength of the barrel-shaped mid-portion 22, as the mid-portion 22 thereby constitutes a spring which under axial loading is resilient shortened coincident with a resilient deflection of the mate-rial in the mid-portion 22 between the recesses 24.
RECTIFIED SHEET (RULE 91) The closing power of the first valve body 4 against the first valve seat 8 is thus among other tings determined by the num-ber of recesses 24 in the mid-portion 22, the wall thickness, and by the relative distance of the first holder 10 to the
5 first valve seat 8.
The second valve body 6 is clamped between a second valve seat 26 positioned in the first valve body 4 at the through opening 16 adjacent the first valve'seat 8, and a second holder 28 being screwed into the third bore 30 of the valve housing 2.
The second holder 28 is in the same manner as the first holder provided with a central bore 32 and a guide bushing 34, as the guide bushing 34 extends displaceably into a cen-tral bore 36 in the second valve body 6. The central bore 36 is in the second valve body 6 is not a through bore, but runs in to a pressure surface 38.
The mid-portion 40 of the second valve body 6 is also formed with a relatively thin-walled barrel-shape and also provided with longitudinal recesses 42.
In this preferred embodiment, the second valve body 6 is pro-vided with more recesses 42 than the number of recesses 24 in the first valve body 4. The second valve body 6 therefore ex-erts a closing force against the second valve seat 26, which is. considerably less than the closing force of the first valve body 4 against the first valve seat 8.
A guide portion 44 of the second valve body 6 extends with a radial clearance into the through opening 16 of the first valve body 4. The guide portion 44 is provided with a trans-verse slot 46.
The second valve body 6 is clamped between a second valve seat 26 positioned in the first valve body 4 at the through opening 16 adjacent the first valve'seat 8, and a second holder 28 being screwed into the third bore 30 of the valve housing 2.
The second holder 28 is in the same manner as the first holder provided with a central bore 32 and a guide bushing 34, as the guide bushing 34 extends displaceably into a cen-tral bore 36 in the second valve body 6. The central bore 36 is in the second valve body 6 is not a through bore, but runs in to a pressure surface 38.
The mid-portion 40 of the second valve body 6 is also formed with a relatively thin-walled barrel-shape and also provided with longitudinal recesses 42.
In this preferred embodiment, the second valve body 6 is pro-vided with more recesses 42 than the number of recesses 24 in the first valve body 4. The second valve body 6 therefore ex-erts a closing force against the second valve seat 26, which is. considerably less than the closing force of the first valve body 4 against the first valve seat 8.
A guide portion 44 of the second valve body 6 extends with a radial clearance into the through opening 16 of the first valve body 4. The guide portion 44 is provided with a trans-verse slot 46.
6 The transverse slot 46 is arranged to be able to prevent the second valve body 6 being able to rotate during a possible drilling of the second valve body 6 once the cement has hard-ened after the concrete is poured.
Fig. 1 shows the valve 1 in a closed position where the first.
valve body 4 abuts closingly against the first valve seat 8, and the second valve body 6 abuts closingly against the sec-ond valve seat 26.
When fluid flows into the through opening 16 of the first valve body and the fluid pressure is increased, the second valve body 6 will, due to liquid pressure against the guide portion 44 at a given pressure being displaced away from the second valve seat 26, as the mid portion 40 of the second valve body 6 is resilient shortened.
Fluid may therefore flow through the valve 1 via the central bore 14, the central opening 16, the second valve seat 26, an annulus 48 encircling the mid-portion 40 of the second valve body 6, the recesses 42, the central bore 36 and the central bore 32, see fig. 2.
The valve 1 closes when the pressure is reduced.
When the fluid pressure in the central bore 36 in the second valve body 6 is increased, the pressure acting against, among other things, the pressure surface 38 will be transferred via the second valve seat 26 to the first valve body 4 and tend to displace this away from the first valve seat 8. At a given pressure, the fluid pressure will overcome the force from the mid-portion of the second valve body 6, whereby the first valve body 4 is displaced out from the first valve seat 8 at the same time as the second valve body 6 follows and is dis-placed somewhat out beyond the guide bushing 34 of the second holder 28, see fig. 3.
RECTIFIED SHEET (RULE 91)
Fig. 1 shows the valve 1 in a closed position where the first.
valve body 4 abuts closingly against the first valve seat 8, and the second valve body 6 abuts closingly against the sec-ond valve seat 26.
When fluid flows into the through opening 16 of the first valve body and the fluid pressure is increased, the second valve body 6 will, due to liquid pressure against the guide portion 44 at a given pressure being displaced away from the second valve seat 26, as the mid portion 40 of the second valve body 6 is resilient shortened.
Fluid may therefore flow through the valve 1 via the central bore 14, the central opening 16, the second valve seat 26, an annulus 48 encircling the mid-portion 40 of the second valve body 6, the recesses 42, the central bore 36 and the central bore 32, see fig. 2.
The valve 1 closes when the pressure is reduced.
When the fluid pressure in the central bore 36 in the second valve body 6 is increased, the pressure acting against, among other things, the pressure surface 38 will be transferred via the second valve seat 26 to the first valve body 4 and tend to displace this away from the first valve seat 8. At a given pressure, the fluid pressure will overcome the force from the mid-portion of the second valve body 6, whereby the first valve body 4 is displaced out from the first valve seat 8 at the same time as the second valve body 6 follows and is dis-placed somewhat out beyond the guide bushing 34 of the second holder 28, see fig. 3.
RECTIFIED SHEET (RULE 91)
7 PCT/N02008/000002 Fluid may now flow through the valve 1 via the central bores 32, 36, the recesses 42, the second annulus 48, the first valve seat 8, the first annulus 25, the recesses 24, the cen-tral opening 16 and the central bore 14.
s The valve bodies 4 and 6 are advantageously produced from a synthetic material or a metal, which may easily be removed e.g. by drilling.
s The valve bodies 4 and 6 are advantageously produced from a synthetic material or a metal, which may easily be removed e.g. by drilling.
Claims (3)
1. A dual directional downhole overpressure valve (1) comprising a valve housing (2) and where a first valve body (2) is forced against a first valve seat (8) by a first force, characterized in that a second valve body (6) is forced against a second valve seat (26) positioned in the first valve body (4) by a second force which is smaller than the first force, the first force and the second force acting in opposite directions, wherein the mid-portions (22, 40) of the valve bodies (4, 6) are provided with a relatively thin-walled barrel-shaped form, wherein the mid-portions (22, 40) of the valve bodies (4, 6) are provided with a number of longitudinal recesses (24, 42) therethrough and, the barrel like shape combined with said recesses (24, 42) causes each mid-portion (22, 40) of the valve body (4, 6) to constitute an axial spring.
2. The dual directional downhole overpressure valve (1) in accordance with claim 1, wherein the first valve body (4) and the second valve body (6) are clamped between their respective valve seats (8, 24) and a first holder (10) and a second holder (28) respectively where the holders (10, 28) are connected to the valve housing (2).
3. The dual directional downhole overpressure valve (1)in accordance with claim 1 or 2, wherein the number of recesses (42) in the second valve body (6) is higher than the number of recesses (24) in the first valve body (4).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20070060 | 2007-01-08 | ||
| NO20070060A NO326033B1 (en) | 2007-01-08 | 2007-01-08 | Device for downhole two-way pressure relief valve |
| PCT/NO2008/000002 WO2008085057A1 (en) | 2007-01-08 | 2008-01-07 | Dual directional downhole overpressure valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2721468A1 CA2721468A1 (en) | 2009-07-17 |
| CA2721468C true CA2721468C (en) | 2015-06-23 |
Family
ID=39608859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2721468A Expired - Fee Related CA2721468C (en) | 2007-01-08 | 2008-01-07 | Dual directional downhole overpressure valve |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2721468C (en) |
| NO (1) | NO326033B1 (en) |
| WO (1) | WO2008085057A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK2574720T3 (en) | 2011-09-30 | 2015-06-01 | Welltec As | Well Injection Tools |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO308324B1 (en) * | 1991-08-08 | 2000-08-28 | Expro North Sea Ltd | Test valve for use in a drill pipe test string, and method for pulling up the test string |
| US5358048A (en) * | 1993-04-27 | 1994-10-25 | Ctc International | Hydraulic port collar |
| US5368098A (en) * | 1993-06-23 | 1994-11-29 | Weatherford U.S., Inc. | Stage tool |
| US6237683B1 (en) * | 1996-04-26 | 2001-05-29 | Camco International Inc. | Wellbore flow control device |
| US5842521A (en) * | 1997-01-29 | 1998-12-01 | Baker Hughes Incorporated | Downhole pressure relief valve for well pump |
| US6729393B2 (en) * | 2000-03-30 | 2004-05-04 | Baker Hughes Incorporated | Zero drill completion and production system |
| GB2360802B (en) * | 2000-03-30 | 2002-05-22 | Baker Hughes Inc | Zero drill completion and production system |
| NO20030840L (en) * | 2003-02-24 | 2004-08-25 | Nils Reimers | Rotary valve assembly |
| US7377327B2 (en) * | 2005-07-14 | 2008-05-27 | Weatherford/Lamb, Inc. | Variable choke valve |
| NO325699B1 (en) * | 2005-08-18 | 2008-07-07 | Peak Well Solutions As | Cement valve assembly |
-
2007
- 2007-01-08 NO NO20070060A patent/NO326033B1/en not_active IP Right Cessation
-
2008
- 2008-01-07 CA CA2721468A patent/CA2721468C/en not_active Expired - Fee Related
- 2008-01-07 WO PCT/NO2008/000002 patent/WO2008085057A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| NO20070060L (en) | 2008-07-09 |
| NO326033B1 (en) | 2008-09-01 |
| WO2008085057A1 (en) | 2008-07-17 |
| CA2721468A1 (en) | 2009-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20220107 |