US3100534A - Plug for use in conduits - Google Patents

Plug for use in conduits Download PDF

Info

Publication number
US3100534A
US3100534A US32657A US3265760A US3100534A US 3100534 A US3100534 A US 3100534A US 32657 A US32657 A US 32657A US 3265760 A US3265760 A US 3265760A US 3100534 A US3100534 A US 3100534A
Authority
US
United States
Prior art keywords
plug
conduit
seal
guide portion
guide
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 - Lifetime
Application number
US32657A
Inventor
Jr Luther J Herndon
George W Evans
John R Land
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Halliburton Co
Original Assignee
Halliburton Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Halliburton Co filed Critical Halliburton Co
Priority to US32657A priority Critical patent/US3100534A/en
Application granted granted Critical
Publication of US3100534A publication Critical patent/US3100534A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B08B9/0552—Spherically shaped pigs
    • 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
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
    • E21B33/16—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes using plugs for isolating cement charge; Plugs therefor

Definitions

  • a plug for preventing contamination between a well treating material and the material used to displace the treating material being pumped through tubing or casing to the desired location in the well.
  • Plugs or" various types have been in common use in the oil industry for many years, particularly in the cementing of wells. It is well known that some means must be provided to prevent the contamination of the treating material, i.e., cement slurries, by drilling fluids or connate waters. Contamination to any great degree during cementing operations will result in lower strength set cement and poor bonding to the well pipe.
  • An object of the present invention is to provide an improved plug that obviates the prior art disadvantages.
  • Another object of this invention is to provide an improved plug that will maintain an effective seal with the conduit even when moved relatively long distances therethrough.
  • this invention contemplates a plug for use in conduits having a resilient upper portion considerably larger than the interior diameter of the conduit and a lower portion adapted to guide or maintain the plug properly oriented as it moves through the conduit.
  • FIGURE 1 is a view of a plug constructed in accordance with the invention shown partly in elevation and partly in cross section.
  • FIGURE 2 is a view of a plug constructed in accordance with another embodiment of the invention shown partly in elevation and partly in cross section.
  • FIGURE 1 there is therein shown a plug having a body 2 and an insert 3 located in the body 2.
  • the body 2 is constructed of a resilient material, such as rubber, neoprene, or any other similar material depending, among other things, upon the treating materials used.
  • Neoprene having a durometer reading of from intermediate portion 5 tapering downwardly and inwardly therefrom.
  • the intermediate portion 5 may be described as a frustum of a cone having its larger base joining the spherical upper portion 4 and having adjoining outer surfaces tangent to the spherical surface of upper portion 4.
  • a lower portion 6 includes an exterior guiding flange 7.
  • the insert 3 is formed from a relatively hard material, such as aluminum, steel or brass. In the preferred method of construction the insert 3 is permanently molded or vulcanized into the lower portion 6. The insert 3 may be threaded as at 9 so that auxiliary apparatus, such as a latching mechanism (not shown) may be attached thereto.
  • auxiliary apparatus such as a latching mechanism (not shown)
  • the outer diameter of the spherical upper portion 4 is considerably larger than the interior diameter of a conduit in which theplug is to be used.
  • the outer diameter of the flange 7 serves to maintain the plug in its upright position and does not necessarily form a seal with the conduit. However, to be certain that the guiding action takes place, it is preferred that the flange 7 be a slight interference fit with the inside of the conduit.
  • FIGURE 2 One embodiment of a larger size plug which may be used is illustrated in FIGURE 2. In this embodiment,
  • the upper spherical portion 4a has an interior chamber 10 which is filled with a fluid, either gas or liquid, under pressure.
  • a fluid either gas or liquid, under pressure.
  • the fluid thus confined provides the desired resiliency so that an effective seal may be maintained with the conduit.
  • an intermediate portion 5a is provided, and although of somewhat different shape serves the same purpose as the intermediate portion 5 of the plug shown in FIGURE 1.
  • a lower portion 6a includes an exterior guiding flange 7a similar to the flange 7 shown in FIGURE 1. Although 7 and 7a are shown as exterior flanges, they serve only to orient the plug and may be of any suitable configuration.
  • insert 35 illustrated in FIGURE 1, may or may not be used depending upon the use for which the plug is intended. No insert is shown in FIGURE 2, but one may be provided if desired.
  • the plug In operation, the plug is inserted in a conduit (not shown) between two materials that are to be kept separated. Upon entering the conduit, the flange '7 deforms slightly to provide the desired guiding action. The upper portion 4 or do is deformed since its diameter is larger than the inside diameter of the conduit thus providing both a seal with the conduit and a wiping action as the plug is moved therethrough. It is important to note that the resiliency of the material provided in the plug of FIGURE 1 and the compressed fluid of the plug of FIGURE 2 tend to continuously force the outer surface of the plug against the interior wall of the conduit, thus maintaining a seal with the conduit at all times. Further, it should be noted that a relatively large reservoir of resilient material is provided in the upper portion 4 and.
  • the plug could be pumped through the flange due to its resiliency.
  • the plug when used in this manner should be provided with the insert 3 which will engage the flange and prevent the plug from passing therethrough.
  • a plug for use in segregating adjacent bodies of fluids in a conduit comprising an elongate resilient body having:
  • seal portion axially spaced from said guide portion and adapted to' be positioned above said guide portion when said plug is positioned within a conduit;
  • said guide portion including continuous, cylindrically configured, peripheral surface means coaxialwith the axis of said plug and having a diameter adapted to provide an interference fit with interior wall means of said conduit;
  • said seal portion including a substantially spherical segment coaxial with said plug axis and defining a closed end of said plug, said spherical segment being of substantially greater diameter than the diameter of said conduit interior wall, and peripherally engageable with said Wall; said spherical segment being axially elongatable whereby, in being radially constricted by peripheral engagement with said conduit interior wall means, said segment may resiliently expand axially of said plug; and said connecting portion being resilient, coaxial with said plug axis, integral with said seal and guide portions, and of less width than the diameter of said spherical segment.
  • a plug as defined in claim 1 also including an insert member in said guide portion, said insert member being formed of material of substantially greater hardness than said resilient body and including threaded fastening means whereby auxiliary apparatus may be attached to said plug.
  • a plug for use in segregating adjacent bodies of fluids in a conduit comprising an elongate resilient body having:
  • seal portion axially spaced from said guide portion and adapted to be positioned above said guide portion when said plug is positioned within a conduit;
  • said guide portion including continuous, cylindrically configured, peripheral surface means coaxial with the axis of said plug and having a diameter adapted to provide an interference fit with interior wall means of said conduit;
  • said seal portion including a substantially spherical segment coaxial with said plug axis and defining a closed end of said plug, said spherical segment being of substantially greater diameter than the diameter of said conduit interior wall, and peripherally engagea'ole with said well;
  • said spherical segment being axially elongatable whereby, in being radially constricted by peripheral engagement with said conduit interior wall means, said segment may resiliently expand axially of said plug;
  • said plug axis integral with said seal and guide portions, and of less width than the diameter of said spherical segment
  • said connecting portion further being generally frusto-conical in configuration and merging tangentially, at its enlarging end, with said spherical segment of said seal portion; said connecting portion and said seal portion comprising an integral, solid, resilient mass.
  • said resilient body seal portion includes in its interior a closed, fluid filled chamber.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)

Description

1953 L. J. HERNDON, JR., ETAL 3,100,534
PLUG FOR USE IN CONDUITS Filed May 31, 1980 INVENTORS. LUTHER J. HERNDO/V JR.
GEORGE w. EVANS 4% R. LAND 4; K Wu 0mm AGENT.
United States Patent Office Patented Aug. 13,- 1963 masses PLUG FUR USE IN CUNDUTTS Luther J. Herndon, 322, George W. Evans, and Eohn R. Land, Duncan, ()lda, assignors to I-Ialiiburton Com pany, a corporation of Delaware Filed May 31, 1960, filer. No. 32,657 4 Claims. (Q1. 166-153) This invention relates generally to plugs for preventing contamination between materials being moved through a conduit.
More specifically, it relates to a plug for preventing contamination between a well treating material and the material used to displace the treating material being pumped through tubing or casing to the desired location in the well.
Plugs or" various types have been in common use in the oil industry for many years, particularly in the cementing of wells. It is well known that some means must be provided to prevent the contamination of the treating material, i.e., cement slurries, by drilling fluids or connate waters. Contamination to any great degree during cementing operations will result in lower strength set cement and poor bonding to the well pipe.
Heretofore, because of the relatively shallow depth to which wells were drilled, it has been possible to obtain satisfactory separation of the treating material and the displacing material by the use of plugs, such as the type shown in US. Patent No. 2,257,784, issued October 7, 1941, to N. F. Brown.
Presently, however, due to the state of thewell drilling ant, well depths have increased until it is now common practice to drill to 10,000 feet or below and in many cases below 20,000 feet.
-It has been found that the plugs now in use have a tendency to wear to the point where an effective seal with the conduit is no longer attained. When the plug fails to seal, then the materials may pass thereby intermingling and contaminating the treating material. This condition is particularly true where the distance the plug is moved through the conduit exceeds 6,000 feet, and frequently occurs around 3,000 feet.
An object of the present invention is to provide an improved plug that obviates the prior art disadvantages.
Another object of this invention is to provide an improved plug that will maintain an effective seal with the conduit even when moved relatively long distances therethrough.
Broadly, this invention contemplates a plug for use in conduits having a resilient upper portion considerably larger than the interior diameter of the conduit and a lower portion adapted to guide or maintain the plug properly oriented as it moves through the conduit.
The foregoing and additional objects and advantages of the invention will become more apparent when the following description is read in conjunction with the accompanying drawing wherein similar numbers denote similar parts in all views and wherein:
FIGURE 1 is a view of a plug constructed in accordance with the invention shown partly in elevation and partly in cross section.
FIGURE 2 is a view of a plug constructed in accordance with another embodiment of the invention shown partly in elevation and partly in cross section.
Referring to the drawing in detail and first to FIGURE 1, there is therein shown a plug having a body 2 and an insert 3 located in the body 2.
The body 2 is constructed of a resilient material, such as rubber, neoprene, or any other similar material depending, among other things, upon the treating materials used. Neoprene, having a durometer reading of from intermediate portion 5 tapering downwardly and inwardly therefrom. The intermediate portion 5 may be described as a frustum of a cone having its larger base joining the spherical upper portion 4 and having adjoining outer surfaces tangent to the spherical surface of upper portion 4. A lower portion 6 includes an exterior guiding flange 7.
The insert 3 is formed from a relatively hard material, such as aluminum, steel or brass. In the preferred method of construction the insert 3 is permanently molded or vulcanized into the lower portion 6. The insert 3 may be threaded as at 9 so that auxiliary apparatus, such as a latching mechanism (not shown) may be attached thereto.
In the embodiment shown in FIGURE 1, the outer diameter of the spherical upper portion 4 is considerably larger than the interior diameter of a conduit in which theplug is to be used. The outer diameter of the flange 7 serves to maintain the plug in its upright position and does not necessarily form a seal with the conduit. However, to be certain that the guiding action takes place, it is preferred that the flange 7 be a slight interference fit with the inside of the conduit.
The embodiment hereinbefore described is admirably suited for use in conduits having a diameter of less than 5 /2 inches and although it may be used in largersizes, the larger solid plugs tend to become rather cumbersome. One embodiment of a larger size plug which may be used is illustrated in FIGURE 2. In this embodiment,
' the upper spherical portion 4a has an interior chamber 10 which is filled with a fluid, either gas or liquid, under pressure. The fluid thus confined provides the desired resiliency so that an effective seal may be maintained with the conduit. 7
In the embodiment of FIGURE 2, an intermediate portion 5a is provided, and although of somewhat different shape serves the same purpose as the intermediate portion 5 of the plug shown in FIGURE 1. A lower portion 6a includes an exterior guiding flange 7a similar to the flange 7 shown in FIGURE 1. Although 7 and 7a are shown as exterior flanges, they serve only to orient the plug and may be of any suitable configuration.
It should be pointed out that the insert 35, illustrated in FIGURE 1, may or may not be used depending upon the use for which the plug is intended. No insert is shown in FIGURE 2, but one may be provided if desired.
In operation, the plug is inserted in a conduit (not shown) between two materials that are to be kept separated. Upon entering the conduit, the flange '7 deforms slightly to provide the desired guiding action. The upper portion 4 or do is deformed since its diameter is larger than the inside diameter of the conduit thus providing both a seal with the conduit and a wiping action as the plug is moved therethrough. It is important to note that the resiliency of the material provided in the plug of FIGURE 1 and the compressed fluid of the plug of FIGURE 2 tend to continuously force the outer surface of the plug against the interior wall of the conduit, thus maintaining a seal with the conduit at all times. Further, it should be noted that a relatively large reservoir of resilient material is provided in the upper portion 4 and.
4a, tending to maintain the seal even though the material is Worn away as the plug passes through the conduit.
Sometimes it is desired to stop the plug at a particular position in the conduit. In accordance with well known principles, an interior flange (not shown) is placed in the conduit so that when the plug contacts the flange, its motion is arrested. However, if suflicient pressure were V v r 3,100,584
to be'applied, the plug could be pumped through the flange due to its resiliency. The plug when used in this manner should be provided with the insert 3 which will engage the flange and prevent the plug from passing therethrough.
It should be apparent that any number of the plugs may be used depending on the number of materials which are to be kept separated.
The embodiments shown and described herein are by way of example only andit should be understood that many modifications and variations may be made without departing from the spirit of the invention or the scope of the annexedclaims.
We claim:
1. A plug for use in segregating adjacent bodies of fluids in a conduit, said plug comprising an elongate resilient body having:
a guide portion;
a seal portion axially spaced from said guide portion and adapted to' be positioned above said guide portion when said plug is positioned within a conduit;
and a connecting portion disposed intermediate of and joining said guide and seal portions;
said guide portion including continuous, cylindrically configured, peripheral surface means coaxialwith the axis of said plug and having a diameter adapted to provide an interference fit with interior wall means of said conduit;
said seal portion including a substantially spherical segment coaxial with said plug axis and defining a closed end of said plug, said spherical segment being of substantially greater diameter than the diameter of said conduit interior wall, and peripherally engageable with said Wall; said spherical segment being axially elongatable whereby, in being radially constricted by peripheral engagement with said conduit interior wall means, said segment may resiliently expand axially of said plug; and said connecting portion being resilient, coaxial with said plug axis, integral with said seal and guide portions, and of less width than the diameter of said spherical segment. 2. A plug as defined in claim 1, also including an insert member in said guide portion, said insert member being formed of material of substantially greater hardness than said resilient body and including threaded fastening means whereby auxiliary apparatus may be attached to said plug.
3. A plug for use in segregating adjacent bodies of fluids in a conduit, said plug comprising an elongate resilient body having:
a guide portion;
a seal portion axially spaced from said guide portion and adapted to be positioned above said guide portion when said plug is positioned within a conduit;
and a connecting portion disposed intermediate of and joining said guide and seal portions;
said guide portion including continuous, cylindrically configured, peripheral surface means coaxial with the axis of said plug and having a diameter adapted to provide an interference fit with interior wall means of said conduit;
said seal portion including a substantially spherical segment coaxial with said plug axis and defining a closed end of said plug, said spherical segment being of substantially greater diameter than the diameter of said conduit interior wall, and peripherally engagea'ole with said well;
said spherical segment being axially elongatable whereby, in being radially constricted by peripheral engagement with said conduit interior wall means, said segment may resiliently expand axially of said plug;
and said connecting portion being resilient, coaxial with.
said plug axis, integral with said seal and guide portions, and of less width than the diameter of said spherical segment, said connecting portion further being generally frusto-conical in configuration and merging tangentially, at its enlarging end, with said spherical segment of said seal portion; said connecting portion and said seal portion comprising an integral, solid, resilient mass. 4. A'plug as defined in claim 1 wherein said resilient body seal portion includes in its interior a closed, fluid filled chamber.
References Cited in the file of this patent UNITED STATES PATENTS 1,122,246 Beam Dec. 29, 1914 2,257,784 Brown Oct. 7, 1941 2,370,833 Baker Mar. 6, 1945 2,567,475 Hall Sept. 11, 195.1 2,662,602 Schnitter Dec. 15, 1953 2,810,143 Reynolds Oct. 22, 1957 2,951,255 Ver Nooy Sept. 6, 1960 2,953,157 Osborne et al. Sept. 20, 1960

Claims (1)

1. A PLUG FOR USE IN SEGREGATING ADJACENT BODIES OF FLUIDS IN A CONDUIT, SAID PLUG COMPRISING AN ELONGATE RESILIENT BODY HAVING: A GUIDE PORTION; A SEAL PORTION AXIALLY SPACED FROM SAID GUIDE PORTION AND ADAPTED TO BE POSITIONED ABOVE SAID GUIDE PORTION WHEN SAID PLUG IS POSITIONED WITHIN A CONDUIT; AND A CONNECTING PORTION DISPOSED INTERMEDIATE OF AND JOINING SAID GUIDE AND SEAL PORTIONS; SAID GUIDE PORTION INCLUDING CONTINUOUS, CYLINDRICALLY CONFIGURED, PERIPHERAL SURFACE MEANS COAXIAL WITH THE AXIS OF SAID PLUG AND HAVING A DIAMETER ADAPTED TO PROVIDE AN INTERFERENCE FIT WITH INTERIOR WALL MEANS OF SAID CONDUIT; SAID SEAL PORTION INCLUDING A SUBSTANTIALLY SPEHERICAL SEGMENT COAXIAL WITH SAID PLUG AXIS AND DEFINING A CLOSED END OF SAID PLUG, SAID SPHERICAL SEGMENT BEING
US32657A 1960-05-31 1960-05-31 Plug for use in conduits Expired - Lifetime US3100534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US32657A US3100534A (en) 1960-05-31 1960-05-31 Plug for use in conduits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32657A US3100534A (en) 1960-05-31 1960-05-31 Plug for use in conduits

Publications (1)

Publication Number Publication Date
US3100534A true US3100534A (en) 1963-08-13

Family

ID=21866105

Family Applications (1)

Application Number Title Priority Date Filing Date
US32657A Expired - Lifetime US3100534A (en) 1960-05-31 1960-05-31 Plug for use in conduits

Country Status (1)

Country Link
US (1) US3100534A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434539A (en) * 1967-03-06 1969-03-25 Byron Jackson Inc Plugs for use in treating wells with liquids
US3437137A (en) * 1967-10-13 1969-04-08 Byron Jackson Inc Conduit plug for separating fluids
US5113544A (en) * 1990-02-08 1992-05-19 Webb Brian C Pipeline pig
US5473787A (en) * 1994-06-21 1995-12-12 Betz Laboratories, Inc. Method and apparatus for cleaning tubes of heat exchangers
WO1999014461A2 (en) * 1997-09-12 1999-03-25 Weatherford/Lamb, Inc. A plug for use in wellbore operations, an apparatus for receiving said plug, a plug landing system and a method for cementing tubulars in a wellbore
US6082451A (en) * 1995-04-26 2000-07-04 Weatherford/Lamb, Inc. Wellbore shoe joints and cementing systems
US6249927B1 (en) * 1998-12-22 2001-06-26 Sumio Ando Duct-cleaning unit
US6595282B2 (en) 2001-04-10 2003-07-22 Baker Hughes Incorporated Fluid filled drill pipe plug
US20130186632A1 (en) * 2012-01-19 2013-07-25 Gary Joe Makowiecki Methods and apparatuses for wiping subterranean casings

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1122246A (en) * 1913-12-11 1914-12-29 Samuel A Beam Swab.
US2257784A (en) * 1938-06-03 1941-10-07 Brown Norman Fraser Plug for use in wells
US2370833A (en) * 1942-03-16 1945-03-06 Baker Oil Tools Inc Apparatus for cementing well bores
US2567475A (en) * 1946-05-16 1951-09-11 Nevada Leasehold Corp Wall cleaning plug
US2662602A (en) * 1947-06-27 1953-12-15 L L Rector Means for guiding, floating, and cementing well casing in bored holes
US2810143A (en) * 1954-06-24 1957-10-22 Phillips Petroleum Co Paraffin scraper
US2951255A (en) * 1958-12-30 1960-09-06 Williamson Inc T Ball-type pipeline devices
US2953157A (en) * 1957-10-14 1960-09-20 Shell Oil Co Apparatus for controlling the pumping of fluids in a pipeline

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1122246A (en) * 1913-12-11 1914-12-29 Samuel A Beam Swab.
US2257784A (en) * 1938-06-03 1941-10-07 Brown Norman Fraser Plug for use in wells
US2370833A (en) * 1942-03-16 1945-03-06 Baker Oil Tools Inc Apparatus for cementing well bores
US2567475A (en) * 1946-05-16 1951-09-11 Nevada Leasehold Corp Wall cleaning plug
US2662602A (en) * 1947-06-27 1953-12-15 L L Rector Means for guiding, floating, and cementing well casing in bored holes
US2810143A (en) * 1954-06-24 1957-10-22 Phillips Petroleum Co Paraffin scraper
US2953157A (en) * 1957-10-14 1960-09-20 Shell Oil Co Apparatus for controlling the pumping of fluids in a pipeline
US2951255A (en) * 1958-12-30 1960-09-06 Williamson Inc T Ball-type pipeline devices

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434539A (en) * 1967-03-06 1969-03-25 Byron Jackson Inc Plugs for use in treating wells with liquids
US3437137A (en) * 1967-10-13 1969-04-08 Byron Jackson Inc Conduit plug for separating fluids
US5113544A (en) * 1990-02-08 1992-05-19 Webb Brian C Pipeline pig
US5473787A (en) * 1994-06-21 1995-12-12 Betz Laboratories, Inc. Method and apparatus for cleaning tubes of heat exchangers
US6056053A (en) * 1995-04-26 2000-05-02 Weatherford/Lamb, Inc. Cementing systems for wellbores
US6082451A (en) * 1995-04-26 2000-07-04 Weatherford/Lamb, Inc. Wellbore shoe joints and cementing systems
WO1999014461A2 (en) * 1997-09-12 1999-03-25 Weatherford/Lamb, Inc. A plug for use in wellbore operations, an apparatus for receiving said plug, a plug landing system and a method for cementing tubulars in a wellbore
WO1999014461A3 (en) * 1997-09-12 1999-06-03 Weatherford Lamb A plug for use in wellbore operations, an apparatus for receiving said plug, a plug landing system and a method for cementing tubulars in a wellbore
US6249927B1 (en) * 1998-12-22 2001-06-26 Sumio Ando Duct-cleaning unit
US6595282B2 (en) 2001-04-10 2003-07-22 Baker Hughes Incorporated Fluid filled drill pipe plug
US20130186632A1 (en) * 2012-01-19 2013-07-25 Gary Joe Makowiecki Methods and apparatuses for wiping subterranean casings

Similar Documents

Publication Publication Date Title
US3483885A (en) "d" dowell valve
US3100534A (en) Plug for use in conduits
US2110825A (en) Packed tool joint
US2069443A (en) Stuffing box
US2352744A (en) Cementing and floating equipment for well casing
GB2054717A (en) Suction of gases from boreholes in coal mining
US3747700A (en) Oil well mandrel and stabilizing sleeve assembly
NZ579391A (en) Compressible darts and methods for using these darts in subterranean walls
US2465197A (en) Coupling
US3618811A (en) Releasable fluid seal or test plug for conduits
US2837353A (en) Thin-wall pipe coupling with pressure actuated locking gasket
US3216500A (en) Plug injector apparatus
US3102595A (en) Apparatus for cementing tubing strings in well bores
US2257784A (en) Plug for use in wells
US2750958A (en) Drill pipe float valve
US1906312A (en) Valve assembly for floating and cementing devices
KR840007794A (en) Core plug
US1926413A (en) Choker
US2949929A (en) Check valve
US2884938A (en) Filling well pipe
US2668593A (en) Device for scraping and testing well tubing
US3091294A (en) Plug for well flow conductors
US3796230A (en) Ball check valve having improved guide assembly
CN204457571U (en) Bumping pump type blowout prevention device
US2351343A (en) Oil saver