US20080110613A1 - Wireline grease head - Google Patents
Wireline grease head Download PDFInfo
- Publication number
- US20080110613A1 US20080110613A1 US11/599,696 US59969606A US2008110613A1 US 20080110613 A1 US20080110613 A1 US 20080110613A1 US 59969606 A US59969606 A US 59969606A US 2008110613 A1 US2008110613 A1 US 2008110613A1
- Authority
- US
- United States
- Prior art keywords
- grease
- inserts
- housing
- grease head
- head
- 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
- 239000004519 grease Substances 0.000 title claims abstract description 64
- 239000000919 ceramic Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- KJLPSBMDOIVXSN-UHFFFAOYSA-N 4-[4-[2-[4-(3,4-dicarboxyphenoxy)phenyl]propan-2-yl]phenoxy]phthalic acid Chemical compound C=1C=C(OC=2C=C(C(C(O)=O)=CC=2)C(O)=O)C=CC=1C(C)(C)C(C=C1)=CC=C1OC1=CC=C(C(O)=O)C(C(O)=O)=C1 KJLPSBMDOIVXSN-UHFFFAOYSA-N 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
- E21B33/072—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells for cable-operated tools
Definitions
- This invention relates to grease control heads for sealing around flexible wireline, slick-line (solid wire) or braided wire (collectively service line) while performing service operations in a well and more particularly to the use of nonmetallic materials, such as ceramic inserts, in the grease head.
- a grease head from the top down may include a line wiper, a grease and liquid overflow housing, one or more grease couplings and one or more flow tubes.
- Each flow tube consists of an outer rigid tube or body, an internal housing for inserts with the housing being a rigid-cylindrical tube and one or more inserts inside the housing.
- viscous grease When working in a well under pressure, viscous grease is injected into the flow tube through one or more grease couplings at a pressure greater than the existing well pressure.
- Grease fills the annular space between the inner wall of inserts and the outside surface of the service line forming a liquid seal that contains the well fluids while allowing service line movement.
- the combination of the inserts, service line and grease provide a pressure barrier to contain the well gas and liquids.
- the grease barrier is increased by increasing the number of flow tubes and grease couplings.
- a problem with the present grease heads is the wear that occurs on the inside surface of the metal inserts, which makes it difficult and eventually impossible to maintain the proper pressure barrier to contain the gases and liquids of the well.
- Grease heads have been made with steel inserts for over 20 years. It has been found that the service line with a metallic surface inside the steel inserts results in particles of steel being pulled from both. As a result, the metal inserts get out of tolerance and grease is pulled down hole with the service line which increases the amount of grease needed for each operation. Additionally, when the wear becomes great enough, the grease head cannot maintain the necessary pressure and fluids from the well, in addition to grease, may escape from the overflow housing at the top of the grease head. As a consequence, the cost of operation increases because of the increase in grease used. Further, the grease that escapes from the grease head and overflow housing gets on trucks, trailers and other devices at the well site which may be an EPA problem.
- This invention involves an improved grease head having a longer life with extended periods between servicing and consists of flow tubes having ceramic inserts.
- the ceramic inserts have a longer life than the typical steel inserts which results in significant reductions in the costs of operation.
- Ceramic inserts and inserts of other non-metallic material do not have the loss of material experienced with metallic inserts. Consequently, there is better control over the well bore pressure. Additionally, not as much grease is required for lower a cost of operation. The EPA concern is significantly reduced and the well site location is kept cleaner. Further, the grease head with ceramic inserts perform as required for over 200 runs of service line through the grease head compared to the typical 20-30 runs with metallic inserts before servicing is needed. Moreover, with ceramic inserts, the service line may be retracted from the well at a much higher speed, such as between 350 feet to 400 feet per minute, as compared to 100 feet to 150 feet per minute with steel inserts.
- FIG. 1 is an elevation view of a grease head in place for performing service operations in a well, according to the present invention
- FIG. 2 is an elevation view of components of the grease head, partially in cross-section, according to the present invention.
- FIG. 3 is a cross-sectional view of the grease head taken along the section lines 3 - 3 of FIG. 2 , according to the present invention
- FIG. 4 is an elevation view of a housing of a flow tube, partially broken away, according to the present invention.
- FIG. 5 is a perspective view of a ceramic insert, according to the present invention.
- Wells that produce gas are drilled to various depths, including common depths of 8,000 feet to 9,000 feet and sometimes to depths of 12,000 feet or greater.
- a solid casing is inserted in the drilled hole to the depth of the hole.
- many tests are conducted down hole and holes are created in the casing.
- the instruments for the tests and the tools, including explosives, for creating the holes are inserted in the well and removed from the well by a service line that carries the instrument or tool at its end.
- the service line may be a solid wire similar to piano wire, a braided wire with internal electrical conductors or braided wire without electrical conductors. In each case, the outer surface of the service line is metallic for strength and durability.
- a service line 1 passes through a grease head 2 that lubricates the line.
- Grease fills the annular space between the outer surface of the service line and an inner surface of the grease head to create a pressure barrier to contain the fluids in the well.
- the grease head 2 includes at least one flow tube 4 and at least one grease coupling 6 .
- the number of flow tubes 4 and grease couplings 6 depends on the desired operating pressure of the grease head, which must be greater than the pressure of the well.
- the grease head 2 is attached to and extends vertically above a well head 7 .
- the well head 7 extends from a casing 8 which is placed in the hole drilled in the earth.
- a tool section 10 which has a length to accommodate the instruments and tools (representatively shown by rectangle 11 ), is located between the grease head 2 and the well head 7 .
- An overflow housing 12 is at the top of the grease head 2 with a line wiper 14 being above the overflow housing.
- Grease is inserted into the grease head 2 through one or more fittings 15 which are screwed into a threaded hole ( FIG. 2 ) in the side of a grease coupling 6 .
- Grease is typically inserted into only one of the grease couplings 6 , when there are a plurality of couplings. Details of the grease head 2 are shown in FIGS. 2-4 .
- the upper grease coupling 6 of FIG. 2 has the grease fitting 15 inserted into a threaded hole 16 in the side of the coupling 6 .
- the flow tube 4 includes a cylindrical outer body 19 that is threaded at both ends with threads 20 and is attached to the grease couplings 6 at each end by threads 21 in the ends of the grease couplings 6 .
- the outer body is a rigid metal cylinder with external threads 20 at each end.
- Inside the outer body 19 is a rigid cylindrical housing 24 .
- Housing 24 has tapers 25 at each end for easy insertion into a recess 27 that has been formed in each end of the grease couplings 6 .
- Ceramic inserts 30 are shown in elevation view in FIG. 2 and in a perspective view in FIG. 5 .
- the housing 24 has a length of 131 ⁇ 2 inches. This length may be greater or less than 131 ⁇ 2 inches. Although there may be a single ceramic insert 30 in the housing 24 , better results are obtained by employing a plurality of ceramic inserts 30 .
- the ceramic inserts 30 have a length of 1.005 inches with an outside diameter 31 of 0.450 inches and an inside diameter 32 of 0.291 inches. The inner diameter 32 is based upon the outer diameter of the service line that passes through the ceramic insert 30 .
- the annular spacing between the outside surface of the service line and the inner surface of the insert 30 is preferably between 0.003 inches and 0.008 inches to provide the desired grease barrier.
- the outer diameter of a service line varies in use compared to the outer diameter of a service line newly installed on a reel or drum.
- the annular spacing is designed to be 0.005 inches between the I.D. of the ceramic insert and the O.D. of the service line in use
- the annular spacing between the ceramic insert 30 and the inner diameter of the housing 24 is between 0.005 inches and 0.010 inches so that the insert will easily slip into the housing 24 .
- the outer diameter 31 of the ceramic inserts 30 may be a standard size for a number of different sizes of service lines, with the inner diameter being determined by the outer diameter of the service line.
- a threaded nut 34 is placed into one end of the housing 24 and then the ceramic inserts 30 are slipped into the housing 24 .
- 13 ceramic inserts having a length of 1.005 inches, are placed in the housing.
- a second threaded cap 34 shown in FIG. 4 , is threaded into the housing 24 to secure the inserts in place.
- the threaded nut 34 may have grooves in the top surface to accommodate a tool or may be a solid nut that has a hex-shaped opening for the tool to insert and tighten the nut in place. Once the nut 34 is in place, the center of the nut 34 is drilled out to permit the service line 1 to pass through the nut and through the ceramic inserts 30 .
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)
- Earth Drilling (AREA)
Abstract
Grease control head utilizing at least one ceramic insert for sealing around wireline, slick-line or braided wire while performing service operations in a well.
Description
- This invention relates to grease control heads for sealing around flexible wireline, slick-line (solid wire) or braided wire (collectively service line) while performing service operations in a well and more particularly to the use of nonmetallic materials, such as ceramic inserts, in the grease head.
- Service lines are passed through a grease head as part of wireline pressure control operations. A grease head from the top down may include a line wiper, a grease and liquid overflow housing, one or more grease couplings and one or more flow tubes. Each flow tube consists of an outer rigid tube or body, an internal housing for inserts with the housing being a rigid-cylindrical tube and one or more inserts inside the housing.
- When working in a well under pressure, viscous grease is injected into the flow tube through one or more grease couplings at a pressure greater than the existing well pressure. Grease fills the annular space between the inner wall of inserts and the outside surface of the service line forming a liquid seal that contains the well fluids while allowing service line movement. The combination of the inserts, service line and grease provide a pressure barrier to contain the well gas and liquids. The grease barrier is increased by increasing the number of flow tubes and grease couplings. A problem with the present grease heads is the wear that occurs on the inside surface of the metal inserts, which makes it difficult and eventually impossible to maintain the proper pressure barrier to contain the gases and liquids of the well.
- The servicing of grease heads, which includes the replacement of the metal inserts, is expensive and time consuming. Additionally, worn inserts abrade braided service lines, which may cause a break in the outer surface and an unraveling of the braid. This hampers or stops the movement of the service line through the grease head and/or other components above and below the grease head.
- Grease heads have been made with steel inserts for over 20 years. It has been found that the service line with a metallic surface inside the steel inserts results in particles of steel being pulled from both. As a result, the metal inserts get out of tolerance and grease is pulled down hole with the service line which increases the amount of grease needed for each operation. Additionally, when the wear becomes great enough, the grease head cannot maintain the necessary pressure and fluids from the well, in addition to grease, may escape from the overflow housing at the top of the grease head. As a consequence, the cost of operation increases because of the increase in grease used. Further, the grease that escapes from the grease head and overflow housing gets on trucks, trailers and other devices at the well site which may be an EPA problem.
- This invention involves an improved grease head having a longer life with extended periods between servicing and consists of flow tubes having ceramic inserts. The ceramic inserts have a longer life than the typical steel inserts which results in significant reductions in the costs of operation.
- Ceramic inserts and inserts of other non-metallic material do not have the loss of material experienced with metallic inserts. Consequently, there is better control over the well bore pressure. Additionally, not as much grease is required for lower a cost of operation. The EPA concern is significantly reduced and the well site location is kept cleaner. Further, the grease head with ceramic inserts perform as required for over 200 runs of service line through the grease head compared to the typical 20-30 runs with metallic inserts before servicing is needed. Moreover, with ceramic inserts, the service line may be retracted from the well at a much higher speed, such as between 350 feet to 400 feet per minute, as compared to 100 feet to 150 feet per minute with steel inserts.
- Objects, features and advantages of this invention will become apparent from a consideration of the foregoing and the following description, the appended claims and the accompanying drawings.
-
FIG. 1 is an elevation view of a grease head in place for performing service operations in a well, according to the present invention; -
FIG. 2 is an elevation view of components of the grease head, partially in cross-section, according to the present invention; -
FIG. 3 is a cross-sectional view of the grease head taken along the section lines 3-3 ofFIG. 2 , according to the present invention; -
FIG. 4 is an elevation view of a housing of a flow tube, partially broken away, according to the present invention; and -
FIG. 5 is a perspective view of a ceramic insert, according to the present invention. - Wells that produce gas are drilled to various depths, including common depths of 8,000 feet to 9,000 feet and sometimes to depths of 12,000 feet or greater. A solid casing is inserted in the drilled hole to the depth of the hole. Thereafter, many tests are conducted down hole and holes are created in the casing. The instruments for the tests and the tools, including explosives, for creating the holes are inserted in the well and removed from the well by a service line that carries the instrument or tool at its end. The service line may be a solid wire similar to piano wire, a braided wire with internal electrical conductors or braided wire without electrical conductors. In each case, the outer surface of the service line is metallic for strength and durability.
- As shown in
FIG. 1 , aservice line 1 passes through agrease head 2 that lubricates the line. Grease fills the annular space between the outer surface of the service line and an inner surface of the grease head to create a pressure barrier to contain the fluids in the well. Thegrease head 2 includes at least oneflow tube 4 and at least onegrease coupling 6. The number offlow tubes 4 andgrease couplings 6 depends on the desired operating pressure of the grease head, which must be greater than the pressure of the well. Thegrease head 2 is attached to and extends vertically above awell head 7. Thewell head 7 extends from acasing 8 which is placed in the hole drilled in the earth. Atool section 10, which has a length to accommodate the instruments and tools (representatively shown by rectangle 11), is located between thegrease head 2 and the wellhead 7. Anoverflow housing 12 is at the top of thegrease head 2 with aline wiper 14 being above the overflow housing. - Grease is inserted into the
grease head 2 through one ormore fittings 15 which are screwed into a threaded hole (FIG. 2 ) in the side of agrease coupling 6. Grease is typically inserted into only one of thegrease couplings 6, when there are a plurality of couplings. Details of thegrease head 2 are shown inFIGS. 2-4 . Theupper grease coupling 6 ofFIG. 2 has the grease fitting 15 inserted into a threadedhole 16 in the side of thecoupling 6. - The
flow tube 4 includes a cylindricalouter body 19 that is threaded at both ends withthreads 20 and is attached to thegrease couplings 6 at each end bythreads 21 in the ends of thegrease couplings 6. The outer body is a rigid metal cylinder withexternal threads 20 at each end. Inside theouter body 19 is a rigidcylindrical housing 24.Housing 24 has tapers 25 at each end for easy insertion into arecess 27 that has been formed in each end of thegrease couplings 6. When theouter body 19 of theflow tube 4 is screwed onto agrease coupling 6 at each end with thehousing 24 in place, the housing is held in place. -
Ceramic inserts 30 are shown in elevation view inFIG. 2 and in a perspective view inFIG. 5 . In one particular grease head thehousing 24 has a length of 13½ inches. This length may be greater or less than 13½ inches. Although there may be a singleceramic insert 30 in thehousing 24, better results are obtained by employing a plurality ofceramic inserts 30. In one typical grease head, the ceramic inserts 30 have a length of 1.005 inches with anoutside diameter 31 of 0.450 inches and an inside diameter 32 of 0.291 inches. The inner diameter 32 is based upon the outer diameter of the service line that passes through theceramic insert 30. The annular spacing between the outside surface of the service line and the inner surface of theinsert 30 is preferably between 0.003 inches and 0.008 inches to provide the desired grease barrier. The outer diameter of a service line varies in use compared to the outer diameter of a service line newly installed on a reel or drum. The annular spacing is designed to be 0.005 inches between the I.D. of the ceramic insert and the O.D. of the service line in use - The annular spacing between the
ceramic insert 30 and the inner diameter of thehousing 24 is between 0.005 inches and 0.010 inches so that the insert will easily slip into thehousing 24. Theouter diameter 31 of the ceramic inserts 30 may be a standard size for a number of different sizes of service lines, with the inner diameter being determined by the outer diameter of the service line. - In the assembly of the
flow tube 4, a threadednut 34 is placed into one end of thehousing 24 and then the ceramic inserts 30 are slipped into thehousing 24. With a 13½ inchlong housing 24, 13 ceramic inserts, having a length of 1.005 inches, are placed in the housing. After insertion of the ceramic inserts, a second threadedcap 34, shown inFIG. 4 , is threaded into thehousing 24 to secure the inserts in place. The threadednut 34 may have grooves in the top surface to accommodate a tool or may be a solid nut that has a hex-shaped opening for the tool to insert and tighten the nut in place. Once thenut 34 is in place, the center of thenut 34 is drilled out to permit theservice line 1 to pass through the nut and through the ceramic inserts 30. - Although the description above contains specificity, this should not be construed as limiting the scope of the invention but merely as providing illustrations of one of the preferred embodiments of the invention. This invention is not limited to the specific embodiments, but rather the scope of the invention is to be determined as claimed.
Claims (4)
1. A grease head for sealing a service line lowered into or raised from a well comprising at least one flow tube having a cylindrical housing for inserts and one or more ceramic inserts aligned inside the housing.
2. A grease head according to claim 1 further comprising a lock-down threaded cap threaded into one end of the housing and engaging the end of the nearest ceramic insert.
3. A grease head for a metallic service line comprising at least one grease coupling, at least one flow tube and at least one nonmetallic insert inside the flow tube.
4. A grease head according to claim 3 wherein the insert is ceramic.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/599,696 US20080110613A1 (en) | 2006-11-15 | 2006-11-15 | Wireline grease head |
CA002610136A CA2610136A1 (en) | 2006-11-15 | 2007-11-01 | Wireline grease head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/599,696 US20080110613A1 (en) | 2006-11-15 | 2006-11-15 | Wireline grease head |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080110613A1 true US20080110613A1 (en) | 2008-05-15 |
Family
ID=39368082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/599,696 Abandoned US20080110613A1 (en) | 2006-11-15 | 2006-11-15 | Wireline grease head |
Country Status (2)
Country | Link |
---|---|
US (1) | US20080110613A1 (en) |
CA (1) | CA2610136A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080264643A1 (en) * | 2007-04-24 | 2008-10-30 | Brian Skeels | Lightweight device for remote subsea wireline intervention |
US20100101797A1 (en) * | 2008-10-03 | 2010-04-29 | Martin William D | Lubricating washpipe system and method |
US20110048734A1 (en) * | 2009-07-30 | 2011-03-03 | Blake Johnson | Snubbing tubulars from a sagd well |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2674474A (en) * | 1949-05-17 | 1954-04-06 | Huber Corp J M | Apparatus for lubricating polish rods |
US4476924A (en) * | 1983-03-07 | 1984-10-16 | Camco, Incorporated | Grease injection control head having a specific gas trap |
US4821799A (en) * | 1988-05-10 | 1989-04-18 | Otis Engineering Corporation | Grease injection control system |
US5398944A (en) * | 1992-12-07 | 1995-03-21 | A. W. Chesterton Co. | Sealing system for reciprocating rod |
US20040140088A1 (en) * | 2003-01-17 | 2004-07-22 | Mentesh Ibrahim M. | Variable choke assembly |
US20040177973A1 (en) * | 2001-02-16 | 2004-09-16 | Helms Charles M. | High tensile loading top entry sub and method |
-
2006
- 2006-11-15 US US11/599,696 patent/US20080110613A1/en not_active Abandoned
-
2007
- 2007-11-01 CA CA002610136A patent/CA2610136A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2674474A (en) * | 1949-05-17 | 1954-04-06 | Huber Corp J M | Apparatus for lubricating polish rods |
US4476924A (en) * | 1983-03-07 | 1984-10-16 | Camco, Incorporated | Grease injection control head having a specific gas trap |
US4821799A (en) * | 1988-05-10 | 1989-04-18 | Otis Engineering Corporation | Grease injection control system |
US5398944A (en) * | 1992-12-07 | 1995-03-21 | A. W. Chesterton Co. | Sealing system for reciprocating rod |
US20040177973A1 (en) * | 2001-02-16 | 2004-09-16 | Helms Charles M. | High tensile loading top entry sub and method |
US20040140088A1 (en) * | 2003-01-17 | 2004-07-22 | Mentesh Ibrahim M. | Variable choke assembly |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080264643A1 (en) * | 2007-04-24 | 2008-10-30 | Brian Skeels | Lightweight device for remote subsea wireline intervention |
WO2008134191A1 (en) * | 2007-04-24 | 2008-11-06 | Fmc Technologies Inc. | Lightweight device for remote subsea wireline intervention |
GB2462751A (en) * | 2007-04-24 | 2010-02-24 | Fmc Technologies | Lightweight device for remote subsea wireline intervention |
US8047295B2 (en) | 2007-04-24 | 2011-11-01 | Fmc Technologies, Inc. | Lightweight device for remote subsea wireline intervention |
GB2462751B (en) * | 2007-04-24 | 2011-11-16 | Fmc Technologies | Lightweight device for remote subsea wireline intervention |
US20100101797A1 (en) * | 2008-10-03 | 2010-04-29 | Martin William D | Lubricating washpipe system and method |
US8225858B2 (en) | 2008-10-03 | 2012-07-24 | Martin William D | Lubricating washpipe system and method |
US20110048734A1 (en) * | 2009-07-30 | 2011-03-03 | Blake Johnson | Snubbing tubulars from a sagd well |
US8631870B2 (en) * | 2009-07-30 | 2014-01-21 | 1440072 Alberta Ltd. | Snubbing tubulars from a SAGD well |
Also Published As
Publication number | Publication date |
---|---|
CA2610136A1 (en) | 2008-05-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |