Abstract
A drill pipe mountable wellbore cleaning tool apparatus includes a support sleeve that is mounted to a drill pipe joint in between the connector end portions of the drill pipe joint. Centralizers are attached to the opposing ends of the support sleeve and the support sleeve carries one or more debris cleaning tools in between the centralizers. At least one locking clamp is attached to the cylindrical portion next to a said centralizer, and prevents the support sleeve from moving longitudinally along the drill pipe joint.
Claims
1. A drill pipe mountable wellbore cleaning tool apparatus, comprising: a) drill pipe joint having first and second end portions and a shaped portion in between the end portions; b) a support sleeve mounted to the drill pipe joint in between the end portions; c) wherein the support sleeve abuts the shaped portion; d) centralizers attached to the opposing ends of the support sleeve; e) the sleeve carrying one or more debris cleaning tools in between the centralizers that enable debris removal from a wellbore; f) at least one locking clamp attached to the drill pipe joint; and g) wherein the locking clamp longitudinally restricts the support sleeve along the drill pipe joint.
2. The drill pipe mountable wellbore cleaning tool apparatus of claim 1, wherein there are a pair of the locking clamps attached to said shaped portion on opposing sides of the support sleeve.
3. The drill pipe mountable wellbore cleaning tool apparatus of claim 1, wherein the debris cleaning tool includes a scraper.
4. The drill pipe mountable wellbore cleaning tool apparatus of claim 1, wherein the drill pipe includes a cylindrical section and the locking clamp includes a plurality of circumferentially spaced slip segments that engage the drill pipe joint cylindrical section.
5. The drill pipe mountable wellbore cleaning tool apparatus of claim 4, wherein the locking clamp has a split cone ring that surrounds the slip segments.
6. The drill pipe mountable wellbore cleaning tool apparatus of claim 5, wherein the slip segments and slip cone ring have correspondingly shaped inclined surfaces that engage.
7. The drill pipe mountable wellbore cleaning tool apparatus of claim 5, wherein the locking clamp has a tensioner sleeve that connects to the slip cone ring, wherein rotation of the tensioner sleeve relative to the slip cone ring forces the inclined surfaces together.
8. The drill pipe mountable wellbore cleaning tool apparatus of claim 1, wherein the locking clamp does not interlock with the support sleeve.
9. A method of cleaning a well comprising the steps of: a) providing drill pipe joint having first and second end portions and a shaped portion in between the end portions; b) mounting a support sleeve to the drill pipe joint in between the end portions; c) attaching centralizers to the opposing ends of the support; d) carrying one or more debris cleaning tools on the sleeve in between the centralizers, each tool enabling debris removal from a wellbore; e) locking one or more clamps to the drill pipe joint, wherein the one or more locking clamps longitudinally restricts the support sleeve relative to the drill pipe joint; f) adding the drill pipe joint to a drill string; and g) cleaning the wellbore with the drill pipe joint of steps “a” through “e”.
10. The method of claim 9, wherein in step “e” there are a pair of the locking clamps attached to the shaped portion on opposing sides of the support sleeve.
11. The method of claim 9, wherein in step “d” the one or more debris cleaning tools includes a scraper.
12. The method of claim 9, wherein in step “d” the one or more debris cleaning tools includes a magnet.
13. The method of claim 9, wherein in step “d” the debris cleaning tool is a brush.
14. The method of claim 9, wherein in step “b” the support sleeve comprises a pair of support sleeve halves that are fastened to each other.
15. The method of claim 14, wherein the support sleeve halves are bolted together.
16. The method of claim 9, wherein the locking clamp includes a plurality of circumferentially spaced slip segments engaging the drill pipe joint shaped section with the slips.
17. The method of claim 9, wherein the locking clamp does not interlock with the support sleeve.
18. A method of cleaning a well comprising the steps of: a) providing drill pipe joint having first and second end portions and a shaped portion in between the end portions; b) mounting a support sleeve to the drill pipe joint in between the end portions, wherein the support sleeve abuts the shaped portion; c) attaching centralizers to the opposing ends of the support sleeve; d) carrying one or more debris cleaning tools on the sleeve in between the centralizers, each tool enabling debris removal from a wellbore; e) locking a clamp to the drill pipe joint, wherein the clamp longitudinally restricts the support sleeve relative to the drill pipe joint; f) transferring the joint from a horizontal position to a vertical position and to a location next to a drill string; g) adding the drill pipe joint to the drill string; and h) cleaning the wellbore with the drill pipe joint of steps “a” through “e”.
19. The method of claim 18, wherein in step “b” the support sleeve comprises a pair of support sleeve halves that are fastened together.
20. The method of claim 18, wherein the locking clamp includes a plurality of circumferentially spaced slip segments engaging the drill pipe joint shaped section with the slips.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
(1) For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:
(2) FIG. 1 is an elevation view of a normal drilling operation showing the handling of drill pipe;
(3) FIGS. 2-4 are elevation views illustrating the method of the present invention and showing the mountable wellbore cleanup tool apparatus of the present invention as part of drilling operations;
(4) FIG. 5 is a perspective view of the preferred embodiment of the apparatus of the present invention;
(5) FIG. 6 is an exploded perspective view of the preferred embodiment of the apparatus of the present invention;
(6) FIG. 7 is a partial sectional elevational view of the preferred embodiment of the apparatus of the present invention;
(7) FIG. 8 is a sectional view taken along lines E-E of FIG. 7;
(8) FIG. 9 is a sectional view taken along lines F-F of FIG. 7;
(9) FIG. 10 is a sectional view taken along lines G-G of FIG. 7;
(10) FIG. 11 is a partial perspective view of the preferred embodiment of the present invention showing a centralizer ring;
(11) FIG. 12 is a partial exploded perspective view of the preferred embodiment of the apparatus of the present invention showing a locking clamp;
(12) FIG. 13 is a perspective view of the locking clamp of FIG. 12;
(13) FIG. 14 is a sectional view of the locking clamp portion of the preferred embodiment of the apparatus of the present invention;
(14) FIG. 15 is a sectional view taken along lines A-A of FIG. 13;
(15) FIG. 16 is an exploded perspective view of the preferred embodiment of the apparatus of the present invention showing the debris removing tool in the form of a mountable scraper;
(16) FIG. 17 is an exploded perspective view of the preferred embodiment of the apparatus of the present invention illustrating a mountable scraper tool;
(17) FIG. 18 is a perspective view of the mountable scraper tool of FIGS. 15 and 16;
(18) FIG. 19 is a sectional view of the mountable scraper tool of FIGS. 16 through 18;
(19) FIG. 20 is a sectional view taken along lines A-A of FIG. 19;
(20) FIG. 21 is a sectional view taken along lines B-B of FIG. 19;
(21) FIG. 22 shows a perspective view of a preferred scraper broach;
(22) FIG. 23 shows various broach arrangements;
(23) FIG. 24 is a perspective view showing a brush type broach;
(24) FIG. 25 is a sectional view showing a broach concentric ID construction;
(25) FIG. 26 is a sectional view showing a broach eccentric broach construction;
(26) FIG. 27 is an exploded perspective view of the preferred embodiment of the apparatus of the present invention showing a mountable brush tool;
(27) FIG. 28 is a perspective view of the preferred embodiment of the apparatus of the present invention showing a mountable brush tool;
(28) FIG. 29 is a sectional view of the mountable brush tool of FIGS. 27 and 28;
(29) FIG. 30 is a sectional view taken along lines C-C of FIG. 29;
(30) FIG. 31 is a sectional view taken along lines D-D of FIG. 29;
(31) FIG. 32 is a sectional view showing an alternate embodiment where the centralizers are an integral component of the split housing;
(32) FIG. 33 is another alternate embodiment with free rotating centralizers and different locking methods;
(33) FIG. 34 is a sectional view showing an alternate centralizer that is attached with grub screws;
(34) FIG. 35 is a sectional view showing centralizers attached with a spline;
(35) FIGS. 36A-36C are sectional views showing various secondary attachment methods;
(36) FIGS. 37A-37C are sectional views showing various brush insert attachment methods;
(37) FIG. 38 is a sectional view showing a generic mountable well brush cleanup tool having a split housing;
(38) FIG. 39 is a sectional view showing a cleanup tool having a hinged housing;
(39) FIG. 40 is an end view showing a cleanup tool having a hinged housing; and
(40) FIG. 41 is a sectional view of a wellbore cleanup tool having a customized tool mandrel.
DETAILED DESCRIPTION OF THE INVENTION
(41) FIGS. 1-10 show the preferred embodiment of the apparatus of the present invention designated generally by the numeral 20 (see for example, FIGS. 2, 6). FIGS. 1-4 illustrate the method of the present invention. In FIGS. 1-4, a derrick 1 is shown having a block 2 and elevator 3. The derrick 1 can be provided with a tugger line 4. In FIGS. 1-3 there is shown a rotary table with slips designated by the numeral 5. Finger boards 6 and mouse hole 7 can be used to store individual drill pipe joints or sections 12. A mouse hole 7 can be used to store a drill pipe joint 12 that can then be lifted using tugger line 4 as shown in FIG. 1. Individual joints of drill pipe 12 are stored on catwalk 9. These joints 12 can be moved as indicated by arrows 13, 14 to Vee door 8 and then to the derrick platform 17. In FIGS. 1-4, a wellbore 10 is shown. Drill string 11 is shown being lowered into wellbore 10. The drill string 11 is comprised of drill pipe joints 12 connected end to end. In FIG. 1, the drill string 11 is supported by the rotary table with slips 5.
(42) The tool apparatus 20 provides a tool assembly 15 which can be mounted to a standard, commercially available drill pipe joint or section 12 as will be described more fully hereinafter. In FIG. 1, arrows 13, 14 illustrate the travel of a drill pipe joint or section 12 from catwalk 9 to platform 17. FIGS. 2, 3 and 4 illustrate the travel path of a joint of drill pipe 12 fitted with tool assembly 15 as it travels from catwalk 9 (FIG. 2) to the platform 17 (see FIG. 3) and into the wellbore 10 (see FIG. 4). In FIG. 4, the tool assembly 15 mounted on a drill pipe joint or section 12 is shown as part of the drill string 11. FIG. 3 illustrates that the tool apparatus 20 (which includes the tool assembly 15 and a joint of drill pipe 12) can be placed in the mouse hole 7, or finger boards 6, or gripped by the block 2 and elevator 3 or placed in the mouse hole 7 prior to being lowed into wellbore 10.
(43) FIGS. 5-10 show tool assembly 15 and tool apparatus 20 in more detail. The tool apparatus 20 is shown in FIGS. 5-10 with tool assembly 15 mounted to drill pipe joint or section 12 and more particularly to the cylindrically shaped portion 23, which has a cylindrical outer surface 24. Each drill pipe joint or section 12 can provide connector end portions 21, 22 such as a pin end portion 21 and a box end portion 22. In between the pin end portion 21 and the box end portion 22 is cylindrical portion 23 having cylindrically shaped outer surface 24 to which tool assembly 15 is attached.
(44) In one embodiment, tool assembly 15 can be mounted to cylindrical portion 23 in between a connector end portion 21, 22 and a locking clamp 28 (see FIG. 5). However, it should be understood that the tool assembly 15 could be mounted in between a pair of locking clamps 28 which are both spaced away from either connector end portion 21 or 22.
(45) Tool assembly 15 provides a support sleeve 25. The support sleeve 25 has sleeve halves 26, 27 (see FIGS. 7-11). Centralizer rings 29 are provided at each end portion of support sleeve 25 and attached thereto with threaded connections 31. The sleeve halves 26, 27 can be connected together using bolts or bolted connections 30. In FIG. 7, split bearings 32 are shown attached to each end portion of support sleeve 25. Compression springs 33 are provided in between support sleeve 25 and centralizer ring 29 at each end portion of tool assembly 15. One or more recesses or sockets 34 are provided in between each centralizer ring 29 and support sleeve 25. These recesses or sockets 34 are receptive of conical spring 36 and grub screw 35. The grub screw 35 can be tightened to occupy recess or socket 34 of sleeve 25.
(46) Once centralizer ring 29 is threaded upon the external threads 37 of support sleeve 25, a threaded connection 31 is perfected between centralizer ring 29 and support sleeve 25. Grub screw 35 is spring loaded using conical spring 36. After the threaded connection 31 is perfected, the grub screw 35 can be backed out slightly to engage a correspondingly shaped recess or socket 43 on centralizer ring 29 (see FIGS. 7, 11). The threaded connection 31 is thus perfected by engaging the external threads 37 of sleeve 25 with the internal threads 38 of centralizer ring 29.
(47) A plurality of magnets 40 are mounted to magnet spacers 41 and magnet internal support sleeve 39. The support sleeve 25 has minimal thickness sections 42 that cover the magnets 40 as shown in FIG. 9.
(48) FIGS. 13-18 show locking clamp 28 in more detail. Locking clamp 28 has a plurality of slip segments 45 that are circumferentially spaced around pipe joint 12 cylindrical portion 23. A split cone ring 46 provides two portions that engage and surround the plurality of slip segments 45 as shown in FIGS. 13, 15 and 17. A split slip ring 47 can be a two part ring that forms a connection at interlocking connection 56 with each slip segment 45. Thus, each slip segment 45 is installed into a mating groove of the split slip ring 47 as shown. Bolted connections or bolts 48 connect the segments 53, 54 of the split slip ring 47 together. Each of the segments 53, 54 has openings 55 that receive bolts or bolted connections 48 and internally threaded openings 60 that engage the threaded end portion of a bolt 48 as shown in FIGS. 13-14, 16 and 18.
(49) A snap ring 49 is placed in between split slip ring 47 and tensioner sleeve 50. Annular grooves can be provided on the outside surface of split slip ring 47 and on the inside surface of tensioner sleeve 50. In FIG. 13, the numeral 63 designates the annular groove on the outside surface of each segment 53, 54 of split slip ring 47. In FIG. 12, the numeral 64 designates the annular groove 64 on the inside surface of tensioner sleeve 50.
(50) Each of the slips or slip segments 45 has an inner toothed portion 51 that grips the cylindrical outer surface 24 of cylindrical portion 23 of drill pipe joint 12. A gap 52 is provided in between each of the slip segments 45 (see FIG. 12). A threaded connection 57 is formed between the external threads 58 of split slip ring 47 and the internal threads 59 of tensioner sleeve 50. Correspondingly shaped and sized annular shoulders are provided on split cone ring 46 and tensioner sleeve 50. In FIG. 14, split cone ring 46 has annular shoulder 61. Tensioner sleeve 50 has annular shoulder 62.
(51) FIGS. 16-22 show a scraper or broach tool designated generally by the numeral 65. FIG. 22 shows perspective views of a scraper broach 70. As with the preferred embodiment, the scraper tool 65 provides a support sleeve 66 which can be a split support sleeve having sleeve halves 67, 68. External split bearings 69 attach to the support sleeve 66 as shown in FIGS. 22 and 25. Centralizer rings 29 connect to the support sleeve 66 with threaded connections as with the preferred embodiment. The support sleeve 66 thus provides external thread 71 (see FIG. 17). The centralizer rings 29 provide internal threads 38 (see FIG. 11). A scraper or broach 70 is a cleaning member that attaches to the outer surface of support sleeve 66, being held in position by the centralizer rings 29 which overlap it as seen in FIGS. 22 and 25. C-rings 72 are provided in between support sleeve 66 and centralizers 29 as shown. Also provided between centralizer rings 29 and support sleeve 66 are spring support ring 78 and compression spring 75. As with the preferred embodiment, grub screws 35 and conical springs 36 can be used to complete the connection between the centralizer ring 29 and support sleeve 66. External split bearings 69 form an interlocking connection with support sleeve 66 at interlocking connection 76. Snap ring 77 can be placed in between external split bearing 69 and centralizer 29.
(52) Pins 74 attaches to sleeve 66 and to broach or scraper 70 as shown in FIGS. 19 through 22. Pins 74 attached to corresponding holes 93 on scraper broach 70. Pins 74 are attached to the support sleeve 66 by welding and become an integral part of the support sleeve 66.
(53) FIGS. 22-26 show various scraper and brush type broaches. In FIG. 24, three different configurations of longitudinal cuts are shown for a broach 89. These can include helical longitudinal cut 90, straight longitudinal cut 91 and tortuous longitudinal cut 92. FIG. 24 shows a brush type broach 89. FIG. 25 illustrates a concentric ID for the broach 89 whereas FIG. 26 shows an eccentric ID for the broach 89. In FIG. 22, the broach 89 is shown having a mating hole 93 for a pin 74, scraper teeth 94 and helical bypass grooves 95. The longitudinal cut 90 is shown in FIG. 22. However, it should be understood that the FIG. 22 configuration could have the straight longitudinal cut 91 or the tortuous longitudinal cut 92 of FIG. 23.
(54) FIGS. 27-31 show a brush tool 80 that can be used to brush the wellbore. Brush tool 80 provides a support sleeve 81 that has a helical split 87 as shown in FIG. 27. Support sleeve 81 has split bearings 82 at its end portion (see FIG. 29). Each end portion of support sleeve 81 has external threaded sections 86 for forming a connection with a centralizer ring 29 as with the earlier embodiments (see FIG. 27). Grub screws 35 and conical springs 36 can be used to form a connection between the support sleeve 81 and centralizer ring s 29 as shown in FIGS. 23 and 25. Compression spring 83 is placed in between centralizer ring 29 and sleeve 81 at interlocking connection 88 which can be in the form of correspondingly shaped annular shoulders provided on both the sleeve 81 and centralizer 29. Compression spring 83 is provided in between the annual shoulders at the interlocking connection 88 as shown in FIG. 29.
(55) A plurality of brush segments 84 are mounted to support sleeve 81 at provided mating grooves 85 (see FIGS. 28 and 29).
(56) FIG. 32 provides a sectional view of a wellbore cleaning tool having integral centralizers which are non-rotating. The well cleaning tool 96 of FIG. 32 is shown mounted to drill pipe section 12. The well cleaning tool 96 provides a split housing or split support sleeve 97 having integral centralizers 98. Cleaning members 99, such as a brush, scraper and/or magnet are mounted to the split housing or support sleeve 97. External rings 100 are provided. The split housing or split support sleeve 97 is placed on drill pipe 12 in between locking clamps 28.
(57) FIG. 33 shows an additional embodiment of the apparatus of the present invention which provides free rotating centralizers or centralizer rings 103. Well cleaning tool 101 has a split housing 102 to which is affixed cleaning members 104. Bolted connections 30 can be used to secure the halves of the split housing together as with the preferred and other embodiments. The centralizer rings 103 engage the outer surface of the split housing 102 and are held in position with a locking ring 105 or 106. The locking ring 105 is a threaded type that engages threads provided on the split housing 102. The locking ring 106 is a lock wire type. Cleaning members 99, such as a brush, scraper and/or magnet are mounted to the split housing or support sleeve 97.
(58) FIG. 34 shows a well cleaning tool designated generally by the numeral 110. The well cleaning tool 110 provides centralizers that are attached with grub screws 35. In FIG. 34, split housing 111 carries cleaning members 112. External rings 113 are secured to split housing 111 using grub screws 35 and conical springs 36. Split housing 111 can provide a recess or socket portion 114 that aligns generally with the recessed or socket portion 115 on external ring 113. The aligned recesses or sockets 114, 115 can be occupied with a grub screw 35 and conical spring 36.
(59) FIG. 35 shows a well cleaning tool 116 wherein centralizers are attached with a spline. In FIG. 35 there is provided well cleaning tool 116 which has a split housing 117 that carries a plurality of cleaning members 118. External centralizer rings 119 are attached to split housing 117 with splines 120. Locking clamps 28 are placed on either side of split housing 117 to maintain its position upon drill pipe joint 12.
(60) FIGS. 36A through 36C show a well cleaning tool 121 with various secondary attachment methods. FIG. 36A shows a version of the secondary attachment method of the external ring to the slip housing using grub screws. FIG. 36B shows a version of the secondary attachment method of the external ring to the slip housing using a snap ring. FIG. 36C shows a secondary attachment method of the external ring to the slip housing using a locking ring and lock wire. In FIGS. 36A, 36B, and 36C there are seen split housing 123, external rings 122, cleaning members 124 and locking clamps 28. Bolted connections 30 are also shown for holding the locking clamp 28 to the drill pipe 12 as well as for securing the split housing 123 to the drill pipe 12.
(61) In FIG. 36A, the secondary attachment method is in the form of grub screws 35. The grub screws 35 can be provided with conical springs 36.
(62) In FIG. 36B, the secondary attachment method of the external ring 122 to the slip housing 123 using a snap ring 125.
(63) In FIG. 36C, the second method of attaching the external ring to the slip housing uses a locking ring and lock wire 126.
(64) FIGS. 37A through 37C show various brush insert and attachment methods on a well cleaning tool 130. In FIG. 37A, a dove tail groove and crimped style brush insert is shown designated as 131. In FIG. 37B, a crimped bullet style brush insert is designated by the numeral 132. In FIG. 37C, a stuffed style brush insert is shown, designated by the numeral 133. In each of the FIGS. 37A, 37B, there can also be seen locking clamp 28, a split housing 134 and external centralizer rings 135. It should be understood that any of the brush inserts of FIGS. 37A, 37B, 37C can be used with any embodiment of the brush tool.
(65) FIG. 38 shows a generic mountable wellbore cleaning tool designated by the numeral 140. The well cleaning tool 140 provides a split housing 141, cleaning member or members 142, external rings 143, locking clamps 28 and bolts or bolted connections 30.
(66) FIGS. 39 and 40 show the well cleaning tool that provides a hinged housing. Well cleaning tool 145 is attached to a section of drill pipe 12 using split housing 146 that includes a pair of halves 147, 148. The split housing halves 147, 148 are pivotally attached at hinge 149 and are connectable using bolted connections 30. As with other embodiments, the well cleaning tool 145 provides cleaning members 150, external rings 151, bolted connections 30, and locking clamps 28.
(67) FIG. 41 shows a well cleaning tool 155 that is shown attached to a customized tool mandrel 156. In FIG. 50 there is provided tool mandrel 156 holding split housing 157. Shown on split housing 157 are cleaning members 158 and external rings 159.
(68) The following is a list of Reference Numerals used in the present invention:
LIST OF REFERENCE NUMERALS
Reference Number Description
(69) 1 derrick 2 block 3 elevator 4 tugger line 5 rotary table with slips 6 finger boards 7 mouse hole 8 Vee door 9 catwalk 10 wellbore 11 drill string 12 drill pipe joint/section 13 arrow 14 arrow 15 tool assembly 16 arrow 17 platform 18 arrow 19 arrow 20 tool apparatus 21 pin end portion/connector end portion 22 box end portion/connector end portion 23 cylindrical portion/connector end portion 24 cylindrical outer surface 25 support sleeve 26 sleeve half 27 sleeve half 28 locking clamp 29 centralizer ring 30 bolt/bolted connection 31 threaded connection 32 split bearing 33 compression spring 34 recess/socket 35 grub screw 36 conical spring 37 external threads 38 internal threads 39 magnet internal support sleeve 40 magnet 41 magnet spacer 42 minimal thickness section 43 socket/recess/bolt hole 44 bypass slot 45 slip segment 46 split cone ring 47 split slip ring 48 bolt/bolted connection 49 snap ring 50 tensioner sleeve 51 toothed portion 52 gap 53 segment 54 segment 55 opening 56 interlocking connection 57 threaded connection 58 external threads 59 internal threads 60 internally threaded opening 61 annular shoulder 62 annular shoulder 63 annular groove 64 annular groove 65 scraper tool 66 support sleeve 67 sleeve half 68 sleeve half 69 external split bearing 70 scraper/broach 71 external thread 72 C-ring 73 split bearing 74 pin 75 compression spring 76 interlocking connection 77 snap ring 78 spring support ring 79 annular end portion 80 brush tool 81 support sleeve 82 split bearing 83 compression spring 84 brush segment 85 mating groove 86 external thread 87 helical split 88 interlocking connection 89 broach 90 helical longitudinal cut 91 straight longitudinal cut 92 tortuous longitudinal cut 93 hole 94 scraper teeth 95 helical bypass groove 96 well cleaning tool 97 split housing/support sleeve 98 integral centralizer 99 cleaning member 100 external ring 101 well cleaning tool 102 split housing 103 centralizer ring 104 cleaning member 105 locking ring, threaded type 106 locking ring, lock wire type 110 well cleaning tool 111 split housing 112 cleaning member 113 external ring 114 recess/socket 115 recess/socket 116 well cleaning tool 117 split housing 118 cleaning member 119 external centralizer ring 120 spline 121 well cleaning tool 122 external ring 123 split housing 124 cleaning member 125 snap ring 126 locking ring/lock wire 130 well cleaning tool 131 dovetailed and crimped style brush insert 132 bullet style brush insert 133 stuffed style brush insert 134 split housing 135 external centralizer ring 140 well cleaning tool 141 split housing 142 cleaning member 143 external ring 145 well cleaning tool 146 split housing 147 half 148 half 149 hinge 150 cleaning member 151 external ring 155 well cleaning tool 156 tool mandrel 157 split housing 158 cleaning member 159 external ring
(70) The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.
