Apparatus for verifying the inner diameter of tubulars forming a tubular string

Abstract

A floating drift apparatus for verifying the inner diameter of tubulars as the tubulars are made up into a tubular string being run into a wellbore. A float section provides buoyancy to float the apparatus in fluid within the bore of a tubular, and a drift section has a drift element with a diameter substantially equal to the tubular inner diameter being verified, which may be the drift diameter. When running a tubular string, the apparatus is inserted into the bore of the tubular string, floating in the fluid. As joints of tubular are made up and run into the wellbore, the tubulars move downhole around the apparatus. Preferably, the floating drift apparatus can be visually detected. If an undersize ID is encountered, the floating drift apparatus will be pushed downhole and no longer visible; the operator can remove the undersize ID tubular from the string.

Claims

1. A method for verifying the inner diameter of tubulars forming a tubular string, comprising the steps of: a. lowering one or more joints of tubulars forming a tubular string, into a wellbore containing a fluid, said fluid entering a bore of said tubular string; b. placing a floating drift apparatus having a desired outer diameter into said bore, said floating drift apparatus having sufficient buoyancy to float in said fluid; and c. continuing to connect additional joints of tubulars to said tubular string and to lower said tubular string into said wellbore, said floating drift apparatus moving relatively upwardly through said bore of said tubular string as said tubular string is lowered.

2. The method of claim 1, further comprising the step of: d. visually detecting a location of said floating drift apparatus as said tubular string is lowered into said wellbore.

3. The method of claim 2, wherein in the event that said step of visually detecting determines that said floating drift apparatus is lodged within said bore of said tubular string, said method further comprises the steps of: e. raising said tubular string from said wellbore a sufficient distance to determine where said floating drift apparatus is lodged; and f. removing any tubulars having undersize inner diameters from the tubular string.

4. The method of claim 3, further comprising the step of: g. after said tubulars having undersize inner diameters are removed from said tubular string, replacing said floating drift apparatus in said tubular string bore and re-commencing connecting joints of tubular into said tubular string and lowering said tubular string into said wellbore.

5. A method of verifying that the internal diameter of tubulars in a tubular string satisfies dimensional requirements, while said string of tubulars is being run into a wellbore containing a fluid, comprising the steps of: a) providing an apparatus comprising: an elongated buoyant float section having an upper end and a lower end, said float section having sufficient buoyant force to float said apparatus in said fluid; and a drift section attached to said lower end of said float section, said drift section comprising a drift element having a desired diameter relative to said internal diameter of said tubulars; b) with one or more of said tubulars run into said wellbore, placing said apparatus into a bore of said one or more tubulars, whereby said apparatus floats in fluid contained within said bore of said tubular; c) connecting another joint of tubular to said one or more tubulars, forming a tubular string, and lowering said tubular string farther into said wellbore; and d) verifying that said apparatus has moved through said tubular string and the connections joining said tubulars, as said tubular string moves downwardly into said wellbore.

6. The method of claim 5, whereby a length of said buoyant section is sufficient to extend out of the uppermost end of said tubular string, a sufficient distance for said apparatus to be grasped and removed.

7. The method of claim 5, wherein said apparatus further comprises a light proximal said upper end, and wherein the step of verifying that said apparatus has moved through said tubular string and the connections joining said tubulars is carried out by visual detection of said light.

8. The method of claim 5, wherein said apparatus further comprises an electronic means for verifying that said apparatus has moved through said tubular string.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGS. 1-9 are views of various embodiments of the floating drift apparatus embodying the principles of the present invention.

(2) FIGS. 10-12 are other embodiments of the floating drift apparatus.

(3) FIG. 13 is a view of another embodiment of a floating drift apparatus embodying the principles of the present invention.

(4) FIG. 14 is a view of the floating drift apparatus positioned within a tubular, with the tubular positioned at the rig floor and extending downwardly into the near-surface wellbore area (e.g. the fluid return equipment).

(5) FIGS. 15-17 illustrate a sequence of running several joints of tubular into a wellbore, as the floating drift apparatus remains substantially in the same location, floating in the wellbore fluid.

(6) FIG. 18 is another embodiment of the floating drift apparatus.

DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENT(S)

(7) With reference to the figures: FIGS. 1-9 show various embodiments of floating drift apparatus 10 (which may be referred to at times as floating drift or drift apparatus), all embodying certain principles of the present invention. Floating drift apparatus 10 fundamentally comprises a body 20 having a sufficient buoyancy force to cause floating drift apparatus 10 to float in a wellbore fluid. Body 20 comprises a desired outer diameter, denoted in the figures as OD. It is understood that OD is selected based on what inner diameter (ID) of the tubular is sought to be verified. Preferably, floating drift apparatus 10 further comprises one or more fluid flow passages 22, whereby fluid can flow by floating drift apparatus 10 when floating drift apparatus 10 is positioned within the bore of a tubular. In FIGS. 2 and 3, flow passage 22 is a longitudinal bore. In FIGS. 4 and 5, flow passages 22 are longitudinal slots positioned around the outer circumference of body 20. In FIGS. 6 and 7, flow passages 22 are a plurality of longitudinal bores through body 20.

(8) Yet other shapes are possible for floating drift apparatus 10. FIGS. 8 and 9 show a generally dumbbell shaped body 20, with longitudinal bores through the enlarged end sections.

(9) Yet other embodiments of floating drift apparatus 10 are shown in FIGS. 10-12. Certain of these will be discussed in more detail later in this application. FIG. 10 shows a tapered body 20 with a float section 24 and a drift section 30, and a drift element 32 of a desired OD, along with a light 70. FIG. 11 shows an egg-shaped body 20 with drift element 32 of a desired OD. FIG. 12 shows a generally spherical body 20, preferably with two drift elements 32, each of a desired OD.

(10) With reference to the figures, especially FIGS. 14-17, the present invention also comprises a method for verifying the inner diameter of tubulars forming a tubular string, comprising the steps of:

(11) a. lowering one or more joints of tubulars forming a tubular string, into a wellbore containing a fluid, said fluid entering a bore of said tubular string;

(12) b. placing a floating drift apparatus 10 having a desired outer diameter into said bore, floating drift apparatus 10 having sufficient buoyancy to float in the fluid; and

(13) c. continuing to connect additional joints of tubulars to said tubular string and to lower the tubular string into said wellbore, floating drift apparatus 10 moving relatively upwardly through the bore of said tubular string as the tubular string is lowered into the wellbore.

ADDITIONAL EMBODIMENTS OF THE APPARATUS AND METHOD OF THE PRESENT INVENTION

(14) With reference to FIGS. 13-17, floating drift apparatus 10 comprises a buoyant float section 20 and a drift section 30. Float section 20 may take various forms, but in preferred embodiments is a generally elongated element. Drift section 30 is attached to float section 20, and comprises drift element 32 having a desired dimension, namely outer diameter (OD) as shown, which may be a circular ring with a desired OD. Typically, the OD of drift element 32 is equal to or slightly less than the drift ID of the tubular being evaluated (verification of ID). It is understood that the OD of drift element 32 may be any desired dimension, whether to verify a drift ID or some smaller ID. It is further understood that drift element 32 may be a complete circular or ring shape; or alternatively may be a “broken” ring (having an interrupted circumference) or may have passages through it for fluid flow. It is understood that the buoyancy force from float section 20 is sufficient to float the entire apparatus in wellbore fluid.

(15) A presently preferred embodiment of floating drift apparatus 10 is shown in FIG. 13. Floating drift apparatus 10 comprises a float section 24 comprising an elongated flotation tube 25, which by way of example may be 20 to 25 feet long. Drift section 30, which is typically connected to a lower end of float section 24, may comprise a drift element 32 having a desired OD. The buoyancy from float section 24 is sufficient to float the entire apparatus in wellbore fluid. The length of flotation tube 25 (as noted, typically 20 to 25 feet long) is preferably sufficient to extend from the typical fluid level in the bore of the tubular in the borehole to at or above the open, upper end of the uppermost tubular joint, which is typically positioned 2 to 3 feet above the rig floor. For example, flotation tube 25 may extend one foot or more out of the upper end of the tubular.

(16) Drift element 32 has a desired OD, typically substantially equal to the drift diameter for the tubular being run, but which may be any desired dimension; for example, the apparatus may be used to verify only a “gauge” inner diameter to ensure safe running of a tool within the tubular, which is typically a diameter smaller than the drift ID. Drift section 30, or drift element 32, may be interchangeable on flotation tube 25.

(17) Additional elements may include rupture discs 60 on flotation tube 25, and a wireline fishing neck 40 on the upper end of float section 20, to permit retrieval or “fishing” of the apparatus if needed. A so-called “junk basket” 50 (see FIG. 6, described in more detail below) may be added, typically to a lower part of floating drift 10. Rupture disk 60 permits fluid to enter the internal portion of flotation tube 25, in the event that floating drift apparatus 10 is subjected to high pressures due to being placed at a greater-than-expected depth in the wellbore fluid, for whatever reason. This feature avoids collapse of flotation tube 25.

AN EXEMPLARY METHOD OF USE

(18) While the floating drift of the present invention lends itself to various methods of use, with reference to the drawings some of the presently preferred methods can be described. As a general diagram to illustrate an exemplary field setting, FIG. 14 shows floating drift apparatus 10 positioned inside the bore of a tubular which is positioned at the surface, typically in slips in the rig floor, noted in the figure. Various other components of the general setting are also shown in FIG. 14, including an exemplary fluid level within the bore of tubular string 100.

(19) FIGS. 15-17 illustrate a sequence of running tubulars into a borehole with floating drift 10 in place. Certain elements shown in FIG. 14 are omitted for clarity. FIG. 15 illustrates an exemplary starting point of running the tubular string. A first joint of tubular (labeled tubular joint #1) is in place, typically in slips in the rotary. It is understood that multiple joints of tubular are joined or connected together (e.g. by threaded connections) to form a tubular string. The fluid level inside tubular joint #1 is shown, with floating drift 10 floating in the fluid. The lowermost end of the tubular is shown with connection #1 shown (which may take various forms; the notation of connection #1 is primarily for reference purposes). As can be seen, the uppermost end of tubular joint #1 is above the rig floor, and the uppermost end of floating drift apparatus 10 may extend beyond (out of) the uppermost end of tubular joint #1. In FIGS. 15-17, fishing neck 40 is omitted for clarity.

(20) FIG. 16 illustrates the next joint of tubular, joint #2, being run into the wellbore. It is understood that joint #2 has been coupled together or connected with joint #1 at connection #2. The fluid level remains more or less constant. The position of floating drift apparatus 10, relative to the rig floor, also remains more or less constant, as the joints of tubular are run downhole around floating drift apparatus 10. FIG. 16 illustrates drift section 30, and more particularly drift element 32, passing through connection #2. It can be understood that in the position shown in FIG. 16, drift element 32 has passed through joint #1, is passing through connection #2, and will be passing through joint #2 (i.e. the tube thereof), thereby verifying the proper ID of those tubulars and the connections between them.

(21) FIG. 16 shows joint #2 in place in slips at the rig floor. The uppermost end of floating drift apparatus 10 is extending beyond the uppermost end of joint #2, thereby verifying that drift section 30/drift element 32 has passed through joint #1 and connection #2, and at least a portion of joint #2.

(22) This described sequence is repeated as the remainder of the tubular string is run into the wellbore. It can be understood that in this manner, the ID of the entirety of the tubular string can be verified.

(23) It is to be understood that in a preferred embodiment floating drift apparatus 10 comprises some means to allow an operator to detect or verify the presence/location of floating drift apparatus 10 within the tubular. In some embodiments, the means for detecting or verifying the location of floating drift apparatus 10 is a simple visual one, by the operator seeing floating drift 10, whether or not floating drift apparatus 10 extends out of the uppermost end of the tubular. Other means for detecting the location of floating drift apparatus 10 include an indicator light 70, see FIGS. 10, 11 and 18 as examples. Indicator light 70 may be a battery powered light known in the relevant field.

(24) Another embodiment of floating apparatus drift 10 is shown in FIG. 6. As noted above, in this embodiment, floating drift apparatus 10 comprises an indicator light 70 at its uppermost end. Still further optional/supplemental means for detecting the presence of floating drift apparatus 10 include electronic devices, e.g. Wifi, RFID or similar devices, denoted generally as 80. Still other means may include echo location, denoted schematically as 90. Equipment for implementing these means for detection are known in the relevant art. Floating drift apparatus 10 may further comprise centralizer 120, a junk basket 50; or wire scrapers/scratchers, denoted generally as 130; and/or a magnet.

MATERIALS

(25) Materials for floating drift apparatus 10 are commonly known in the relevant industry, including high strength steel, non-ferrous, non-metallic seal elements if required, etc. Methods of manufacturing would include those commonly used for similar apparatus.

OTHER EMBODIMENTS

(26) Various apparatus for verifying inner dimensions of tubulars can embody the principles of the present invention. FIG. 10 shows an embodiment in which float section 20 is generally disposed below drift element 30, when the apparatus is in place within the bore of a tubular. An indicator light 70, which may be battery powered, may be disposed on floating drift 10 and positioned so as to be visible from above. An operator can then visually detect the location of floating drift 10 even though floating drift apparatus 10 does not extend out of the tubular string. With this embodiment, retrieval of floating drift 10 may be by a magnet or other means.

(27) Yet another embodiment is shown in FIG. 11, in which float section 20 is a generally oblong shape on which drift section 30, including drift element 32, is connected.

(28) Still another embodiment is shown in FIG. 12, in which floating drift apparatus 10 generally takes the form of a sphere having a desired diameter. In this embodiment float section 20 and drift section 30 are effectively merged into one, comprising one or more drift elements 32 so as to provide the drift ID verification regardless of orientation of floating drift 10 within the bore of the tubular.

CONCLUSION

(29) It is understood that the foregoing description presents various embodiments of the present invention, by way of example and not limitation. Various changes can be made to the apparatus and methods embodying the principles of the invention. Therefore, the scope of the invention is not limited by the foregoing examples, but by the appended claims and the legal equivalents thereof.