US20120160477A1 - Large bore jar for a drill string - Google Patents
Large bore jar for a drill string Download PDFInfo
- Publication number
- US20120160477A1 US20120160477A1 US13/336,865 US201113336865A US2012160477A1 US 20120160477 A1 US20120160477 A1 US 20120160477A1 US 201113336865 A US201113336865 A US 201113336865A US 2012160477 A1 US2012160477 A1 US 2012160477A1
- Authority
- US
- United States
- Prior art keywords
- jar
- drill string
- outer diameter
- drill
- tubular
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 4
- 230000006978 adaptation Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/107—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars
-
- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
Definitions
- This relates to a large bore jar, a drill string that incorporates a large bore jar, and a method of using the same, such as a drill string that may be used for coring, where the large bore jar allows retrievable tools to travel along the drill string.
- Jars are used in downhole tools, most commonly drill strings or fishing tools to help release components that may become stuck.
- a drill string comprising a bit sub mounted to a lower end of a plurality of tubular sections.
- At least one tubular section comprises a jar, the jar and the tubular sections having an inner diameter that is at least 41 ⁇ 4′′ and an outer diameter that is 7′′ or less.
- a coring tool has an outer diameter that is less than 41 ⁇ 4′′. The outer diameter may be between 63 ⁇ 4′′ and 7′′.
- a jar sub for a drill string having a coring bit comprising a jar body having an inner diameter that is at least 41 ⁇ 4′′ and an outer diameter that is 7′′ or less, the inner diameter being greater than an outer diameter of a core retrieval tool.
- the outer diameter may be between 63 ⁇ 4′′ and 7′′.
- a method of coring comprising the step of: providing a drill string comprising a bit sub mounted to a lower end of a plurality of tubular sections, at least one tubular section comprising a jar, the jar and the tubular sections having an inner diameter that is at least 41 ⁇ 4′′ and an outer diameter that is 7′′ or less; inserting the drill string into a downhole formation; causing the bit sub to drill a core sample that is received within a tubular section; and inserting a core retrieval tool through the drill string to retrieve the core sample.
- the method may further comprise the step of activating the jar to free the drill string from an obstruction.
- FIGS. 1 a and 1 b are detailed side elevation views in section of a jar.
- FIG. 2 is a side elevation view in section of a drill string with a jar
- FIG. 2 a is a detailed side elevation view of the drill bit in a drilling configuration.
- FIG. 3 is a side elevation view in section of a drill string with a jar and a drill bit in a coring configuration.
- FIG. 3 a is a detailed side elevation view of the drill bit in a drilling configuration.
- a drill string having a large bore jar generally identified by reference numeral 10 will now be described with reference to FIGS. 1 a through 3 a.
- drill string 10 is designed with an inner bore 11 that allows retrievable tools to be inserted. This type of drill string may be used when coring samples are required.
- drill string 10 has a bit sub 12 and a number of tubular sections, including core barrels 14 , drill pipe sections 16 and a jar 16 .
- Jar 16 may be included at any desired distance above bit sub 12 .
- the position of jar 18 will depend on where it is anticipated that drill string may become stuck. If jar 18 is too far above or below this location, its effectiveness will be reduced.
- jar 18 has a large bore that allows retrievable tools to pass through.
- Jar 18 has a generally thinner sidewall than most other jars, and is large enough to be incorporated into a drill string 10 that is designed to obtain a core sample.
- drill string 10 and jar 18 may each have an outer diameter that is less than 7′′, and preferably between 63 ⁇ 4′′ and 7′′, and an inner diameter that is greater than 41 ⁇ 4′′, and preferably 41 ⁇ 4′′.
- This inner diameter is a common size that many retrievable tools are designed to be used with, particularly in relation to coring drill strings.
- the actual design of jar 18 may vary depending on the preferences of the user. However, jar 18 may be a mechanical jar or a hydraulic jar.
- the depicted hydraulic jar is be activated by applying vertical pressure on the outer tubular 20 of jar 18 . Whether the pressure is upward or downward will depend on the design of the jar and/or the preferred direction of the jarring force. After a predetermined delay, outer tubular 20 is released to move axially and strikes inner tubular 22 , applying a jarring force to free drill string 10 when it is obstructed or otherwise stuck. It will be understood that a jar may be designed in many ways.
- bit sub 12 includes a removable central bit portion 22 that drills a full bore.
- central bit portion 22 is removed as shown in FIGS. 3 and 3 a . This is done by removing central bit portion 22 through drill string 10 .
- the presently described drill string 10 with jar 18 allows such coring tools to pass through drill string 10 , while giving drill string 10 the ability to “jar” string 10 loose in the event that it becomes stuck.
- a core sample 24 may then be drilled from the downhole formation into which drill string 10 has been inserted. Core sample 24 is then received in a core barrel 14 . The core sample 24 is then retrieved using core retrieval tool 26 . If drill string 10 becomes stuck or otherwise obstructed downhole, jar 18 is activated to free drill string 10 .
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)
- Marine Sciences & Fisheries (AREA)
- Sampling And Sample Adjustment (AREA)
- Earth Drilling (AREA)
Abstract
A drill string includes a bit sub mounted to a lower end of a plurality of tubular sections, where at least one tubular section is a jar. The jar and the tubular sections have an inner diameter that is at least 4¼″ and an outer diameter that is 7″ or less. A method of drilling includes the steps of inserting the drill string into a downhole formation; causing the bit sub to drill a core sample that is received within a tubular section; and inserting a core retrieval tool through the drill string to retrieve the core sample.
Description
- This relates to a large bore jar, a drill string that incorporates a large bore jar, and a method of using the same, such as a drill string that may be used for coring, where the large bore jar allows retrievable tools to travel along the drill string.
- Jars are used in downhole tools, most commonly drill strings or fishing tools to help release components that may become stuck.
- According to an aspect, there is provided a drill string, comprising a bit sub mounted to a lower end of a plurality of tubular sections. At least one tubular section comprises a jar, the jar and the tubular sections having an inner diameter that is at least 4¼″ and an outer diameter that is 7″ or less. A coring tool has an outer diameter that is less than 4¼″. The outer diameter may be between 6¾″ and 7″.
- According to an aspect, there is provided a jar sub for a drill string having a coring bit, comprising a jar body having an inner diameter that is at least 4¼″ and an outer diameter that is 7″ or less, the inner diameter being greater than an outer diameter of a core retrieval tool. The outer diameter may be between 6¾″ and 7″.
- According to an aspect, there is provided a method of coring, comprising the step of: providing a drill string comprising a bit sub mounted to a lower end of a plurality of tubular sections, at least one tubular section comprising a jar, the jar and the tubular sections having an inner diameter that is at least 4¼″ and an outer diameter that is 7″ or less; inserting the drill string into a downhole formation; causing the bit sub to drill a core sample that is received within a tubular section; and inserting a core retrieval tool through the drill string to retrieve the core sample.
- The method may further comprise the step of activating the jar to free the drill string from an obstruction.
- These and other features will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to be in any way limiting, wherein:
-
FIGS. 1 a and 1 b are detailed side elevation views in section of a jar. -
FIG. 2 is a side elevation view in section of a drill string with a jar -
FIG. 2 a is a detailed side elevation view of the drill bit in a drilling configuration. -
FIG. 3 is a side elevation view in section of a drill string with a jar and a drill bit in a coring configuration. -
FIG. 3 a is a detailed side elevation view of the drill bit in a drilling configuration. - A drill string having a large bore jar generally identified by
reference numeral 10, will now be described with reference toFIGS. 1 a through 3 a. - Referring to
FIG. 2 ,drill string 10 is designed with aninner bore 11 that allows retrievable tools to be inserted. This type of drill string may be used when coring samples are required. Referring toFIGS. 2 and 3 , starting from the bottom,drill string 10 has abit sub 12 and a number of tubular sections, includingcore barrels 14,drill pipe sections 16 and ajar 16.Jar 16 may be included at any desired distance abovebit sub 12. The position ofjar 18 will depend on where it is anticipated that drill string may become stuck. Ifjar 18 is too far above or below this location, its effectiveness will be reduced. These considerations are understood by those skilled in the art in relation to other downhole tools that incorporate jars. - Referring to
FIG. 1 ,jar 18 has a large bore that allows retrievable tools to pass through.Jar 18 has a generally thinner sidewall than most other jars, and is large enough to be incorporated into adrill string 10 that is designed to obtain a core sample. For example,drill string 10 andjar 18 may each have an outer diameter that is less than 7″, and preferably between 6¾″ and 7″, and an inner diameter that is greater than 4¼″, and preferably 4¼″. This inner diameter is a common size that many retrievable tools are designed to be used with, particularly in relation to coring drill strings. The actual design ofjar 18 may vary depending on the preferences of the user. However,jar 18 may be a mechanical jar or a hydraulic jar. As the operation of mechanical and hydraulic jars generally is well known in the art, only a brief description of a hydraulic jar will be given here. The depicted hydraulic jar is be activated by applying vertical pressure on theouter tubular 20 ofjar 18. Whether the pressure is upward or downward will depend on the design of the jar and/or the preferred direction of the jarring force. After a predetermined delay,outer tubular 20 is released to move axially and strikes inner tubular 22, applying a jarring force tofree drill string 10 when it is obstructed or otherwise stuck. It will be understood that a jar may be designed in many ways. - An example will now be described with respect to a retrievable tool used for taking core samples.
- Referring to
FIGS. 2 and 2 a, during a drilling operation,bit sub 12 includes a removablecentral bit portion 22 that drills a full bore. When a core sample is to be taken,central bit portion 22 is removed as shown inFIGS. 3 and 3 a. This is done by removingcentral bit portion 22 throughdrill string 10. The presently describeddrill string 10 withjar 18 allows such coring tools to pass throughdrill string 10, while givingdrill string 10 the ability to “jar”string 10 loose in the event that it becomes stuck. Oncecentral bit portion 22 is removed, acore sample 24 may then be drilled from the downhole formation into whichdrill string 10 has been inserted.Core sample 24 is then received in acore barrel 14. Thecore sample 24 is then retrieved usingcore retrieval tool 26. Ifdrill string 10 becomes stuck or otherwise obstructed downhole,jar 18 is activated to freedrill string 10. - In this patent document, the word “comprising” is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article “a” does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
- The following claims are to be understood to include what is specifically illustrated and described above, what is conceptually equivalent, and what can be obviously substituted. Those skilled in the art will appreciate that various adaptations and modifications of the described embodiments can be configured without departing from the scope of the claims. The illustrated embodiments have been set forth only as examples and should not be taken as limiting the invention. It is to be understood that, within the scope of the following claims, the invention may be practiced other than as specifically illustrated and described.
Claims (6)
1. A drill string, comprising:
a bit sub mounted to a lower end of a plurality of tubular sections;
at least one tubular section comprising a jar, the jar and the tubular sections having an inner diameter that is at least 4¼″ and an outer diameter that is 7″ or less; and
a coring tool having an outer diameter that is less than 4¼″.
2. The drill string of claim 1 , wherein the outer diameter is between 6¾″ and 7″.
3. A jar sub for a drill string having a coring bit, comprising:
a jar body having an inner diameter that is at least 4¼″ and an outer diameter that is 7″ or less, the inner diameter being greater than an outer diameter of a core retrieval tool.
4. The jar sub of claim 3 , wherein the outer diameter is between 6¾″ and 7″.
5. A method of coring, comprising the step of:
providing a drill string comprising a bit sub mounted to a lower end of a plurality of tubular sections, at least one tubular section comprising a jar, the jar and the tubular sections having an inner diameter that is at least 4¼″ and an outer diameter that is 7″ or less;
inserting the drill string into a downhole formation;
causing the bit sub to drill a core sample that is received within a tubular section; and
inserting a core retrieval tool through the drill string to retrieve the core sample.
6. The method of claim 5 , further comprising the step of activating the jar to free the drill string from an obstruction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/336,865 US20120160477A1 (en) | 2010-12-24 | 2011-12-23 | Large bore jar for a drill string |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201061427152P | 2010-12-24 | 2010-12-24 | |
US13/336,865 US20120160477A1 (en) | 2010-12-24 | 2011-12-23 | Large bore jar for a drill string |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120160477A1 true US20120160477A1 (en) | 2012-06-28 |
Family
ID=46315282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/336,865 Abandoned US20120160477A1 (en) | 2010-12-24 | 2011-12-23 | Large bore jar for a drill string |
Country Status (2)
Country | Link |
---|---|
US (1) | US20120160477A1 (en) |
CA (1) | CA2763234A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9551199B2 (en) | 2014-10-09 | 2017-01-24 | Impact Selector International, Llc | Hydraulic impact apparatus and methods |
US9644441B2 (en) | 2014-10-09 | 2017-05-09 | Impact Selector International, Llc | Hydraulic impact apparatus and methods |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2248910A (en) * | 1939-08-29 | 1941-07-08 | Phillips Petroleum Co | Pressure retaining core barrel |
US3977482A (en) * | 1973-10-04 | 1976-08-31 | Federal Drilling Supplies Limited | Wire line core barrel assembly |
US4558749A (en) * | 1983-10-17 | 1985-12-17 | Norton Christensen, Inc. | Anti-jamming core barrels |
US5906239A (en) * | 1997-04-11 | 1999-05-25 | Iri International Corporation | Jarring tool |
US6659204B2 (en) * | 1998-07-29 | 2003-12-09 | Japan National Oil Corporation | Method and apparatus for recovering core samples under pressure |
US20100012383A1 (en) * | 2007-03-03 | 2010-01-21 | Longyear Tm, Inc. | High productivity core drilling system |
-
2011
- 2011-12-23 CA CA2763234A patent/CA2763234A1/en not_active Abandoned
- 2011-12-23 US US13/336,865 patent/US20120160477A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2248910A (en) * | 1939-08-29 | 1941-07-08 | Phillips Petroleum Co | Pressure retaining core barrel |
US3977482A (en) * | 1973-10-04 | 1976-08-31 | Federal Drilling Supplies Limited | Wire line core barrel assembly |
US4558749A (en) * | 1983-10-17 | 1985-12-17 | Norton Christensen, Inc. | Anti-jamming core barrels |
US5906239A (en) * | 1997-04-11 | 1999-05-25 | Iri International Corporation | Jarring tool |
US6659204B2 (en) * | 1998-07-29 | 2003-12-09 | Japan National Oil Corporation | Method and apparatus for recovering core samples under pressure |
US20100012383A1 (en) * | 2007-03-03 | 2010-01-21 | Longyear Tm, Inc. | High productivity core drilling system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9551199B2 (en) | 2014-10-09 | 2017-01-24 | Impact Selector International, Llc | Hydraulic impact apparatus and methods |
US9644441B2 (en) | 2014-10-09 | 2017-05-09 | Impact Selector International, Llc | Hydraulic impact apparatus and methods |
Also Published As
Publication number | Publication date |
---|---|
CA2763234A1 (en) | 2012-06-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: W.L.C. JARS INC., CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PROKOPCHUK, NORMAN;REEL/FRAME:027863/0673 Effective date: 20120305 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |