CA2763234A1 - Large bore jar for a drill string - Google Patents
Large bore jar for a drill string Download PDFInfo
- Publication number
- CA2763234A1 CA2763234A1 CA2763234A CA2763234A CA2763234A1 CA 2763234 A1 CA2763234 A1 CA 2763234A1 CA 2763234 A CA2763234 A CA 2763234A CA 2763234 A CA2763234 A CA 2763234A CA 2763234 A1 CA2763234 A1 CA 2763234A1
- Authority
- CA
- Canada
- 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
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
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)
- Earth Drilling (AREA)
- Sampling And Sample Adjustment (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 4 1/4" 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
TITLE
[0001] Large bore jar for a drill string FIELD
[0001] Large bore jar for a drill string FIELD
[0002] 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.
BACKGROUND
BACKGROUND
[0003] Jars are used in downhole tools, most commonly drill strings or fishing tools to help release components that may become stuck.
SUMMARY
SUMMARY
[0004] 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 4 '/4"
and an outer diameter that is 7" or less. A coring tool has an outer diameter that is less than 4 1/4". The outer diameter may be between 6 3/4" and 7".
and an outer diameter that is 7" or less. A coring tool has an outer diameter that is less than 4 1/4". The outer diameter may be between 6 3/4" and 7".
[0005] 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 4'/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 6 3/4" and 7".
[0006] 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 4 '/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.
[0007] The method may further comprise the step of activating the jar to free the drill string from an obstruction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The method may further comprise the step of activating the jar to free the drill string from an obstruction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] 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:
FIG. la and lb 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. 2a 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. 3a is a detailed side elevation view of the drill bit in a drilling configuration.
DETAILED DESCRIPTION
FIG. la and lb 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. 2a 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. 3a is a detailed side elevation view of the drill bit in a drilling configuration.
DETAILED DESCRIPTION
[0009] A drill string having a large bore jar generally identified by reference numeral 10, will now be described with reference to FIG. 1a through 3a.
[0010] Referring to FIG. 2, 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. Referring to FIG. 2 and 3, starting from the bottom, 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. These considerations are understood by those skilled in the art in relation to other downhole tools that incorporate jars.
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. These considerations are understood by those skilled in the art in relation to other downhole tools that incorporate jars.
[0011] 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 a drill string 10 that is designed to obtain a core sample. For example, drill string 10 and jar 18 may each have an outer diameter that is less than 7", and preferably between 6 3/4" and 7", and an inner diameter that is greater than 4 '/4", and preferably 4 '/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. 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 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.
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. 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 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.
[0012] An example will now be described with respect to a retrievable tool used for taking core samples.
[0013] Referring to FIG. 2 and 2a, during a drilling operation, bit sub 12 includes a removable central bit portion 22 that drills a full bore. When a core sample is to be taken, central bit portion 22 is removed as shown in FIG. 3 and 3a. 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. Once central bit portion 22 is removed, 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.
[0014] 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.
[0015] 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 4 1/4" and an outer diameter that is 7" or less;
a coring tool having an outer diameter that is less than 4 1/4".
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 4 1/4" and an outer diameter that is 7" or less;
a coring tool having an outer diameter that is less than 4 1/4".
2. The drill string of claim 1, wherein the outer diameter is between 6 3/4"
and 7".
and 7".
3. Ajar sub for a drill string having a coring bit, comprising:
a jar body having an inner diameter that is at least 4 1/4" and an outer diameter that is 7" or less, the inner diameter being greater than an outer diameter of a core retrieval tool.
a jar body having an inner diameter that is at least 4 1/4" 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 6 1/4" 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 4 1/4" 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;
inserting a core retrieval tool through the drill string to retrieve the core sample.
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 4 1/4" 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;
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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201061427152P | 2010-12-24 | 2010-12-24 | |
US61/427,152 | 2010-12-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2763234A1 true CA2763234A1 (en) | 2012-06-24 |
Family
ID=46315282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2763234A Abandoned CA2763234A1 (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) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9644441B2 (en) | 2014-10-09 | 2017-05-09 | Impact Selector International, Llc | Hydraulic impact apparatus and methods |
US9551199B2 (en) | 2014-10-09 | 2017-01-24 | Impact Selector International, Llc | Hydraulic impact apparatus and methods |
Family Cites Families (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 |
US6216804B1 (en) * | 1998-07-29 | 2001-04-17 | James T. Aumann | Apparatus for recovering core samples under pressure |
EP2132395B1 (en) * | 2007-03-03 | 2019-02-20 | Longyear TM, Inc. | High productivity core drilling system |
-
2011
- 2011-12-23 US US13/336,865 patent/US20120160477A1/en not_active Abandoned
- 2011-12-23 CA CA2763234A patent/CA2763234A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20120160477A1 (en) | 2012-06-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FZDE | Discontinued |
Effective date: 20151223 |