WEBVTT 00:00.000 --> 00:04.907 Imagine standing beside an old wooden derrick. You hear a cable tighten, 00:04.907 --> 00:09.813 a heavy tool rise, and a blow travel down into the ground. 00:09.813 --> 00:11.449 Lift. Drop. Turn. Repeat. 00:11.449 --> 00:15.409 Now move forward to a modern drilling floor. The well turns out 00:15.409 --> 00:19.369 into a long lateral. Screens show torque, weight on bit, differential pressure, 00:19.369 --> 00:23.329 and rate of penetration. Somewhere beyond the heel, where nobody can watch 00:23.329 --> 00:25.969 directly, a cutting structure is meeting fresh rock. 00:25.969 --> 00:30.300 The equipment looks completely different. The basic question has survived: how do 00:30.300 --> 00:34.631 you break the next piece of formation, clear it away, and keep 00:34.631 --> 00:35.714 the hole usable? 00:35.714 --> 00:39.559 Welcome to GeoNavigate Industry Chatter. This is the first part of our 00:39.559 --> 00:43.404 drill-bit history series. We are following the working end of the drilling 00:43.404 --> 00:47.249 system: the iron that pounded, the teeth that rolled, and the diamond 00:47.249 --> 00:48.531 that learned to shear. 00:48.531 --> 00:52.334 We will meet Howard Hughes, distinguish the father from the famous son, 00:52.334 --> 00:56.138 and find out why the history refuses to fit into a neat 00:56.138 --> 00:59.307 procession where every new bit makes the previous one disappear. 00:59.307 --> 01:03.543 A cable-tool rig breaks formation by repeated impact. A heavy steel bit 01:03.543 --> 01:07.778 hangs below the drilling tools. The mechanism lifts it and lets it 01:07.778 --> 01:12.013 strike the bottom. A small rotation between blows helps produce a round 01:12.013 --> 01:16.248 hole. Drilling pauses for cleaning, and worn cutting edges have to be 01:16.248 --> 01:20.484 dressed again. Alberta's historical account describes this rhythm of drilling, bailing, and 01:20.484 --> 01:20.837 sharpening. 01:20.837 --> 01:24.167 Picture the bit as the head of a very long, guided hammer. 01:24.167 --> 01:27.497 The geology does not care whether the force came from a modern 01:27.497 --> 01:30.827 motor or a walking beam. What matters at the contact is the 01:30.827 --> 01:34.157 stress delivered to the rock and whether a new fracture can grow. 01:34.157 --> 01:38.164 There is another limit. Broken rock still occupies the hole. If you 01:38.164 --> 01:42.171 keep striking through a bed of debris, energy goes into material you 01:42.171 --> 01:46.177 have already broken. Making fragments and removing fragments are separate jobs. A 01:46.177 --> 01:49.182 useful history of drill bits has to follow both. 01:49.182 --> 01:53.597 The spudding bit is a documented oilfield tool. A reproduced 1913 Oil 01:53.597 --> 01:58.011 Well Supply catalogue distinguishes it from the regular drilling bit and the 01:58.011 --> 02:02.425 reamer. The spudding bit opened the larger upper hole; the regular bit 02:02.425 --> 02:06.840 deepened it; the reamer restored diameter when needed. Those are different jobs 02:06.840 --> 02:08.311 within a drilling system. 02:08.311 --> 02:12.627 Spear and arrow are words that make a strong visual impression. They 02:12.627 --> 02:16.942 can describe pointed shapes. But a pointed shape alone cannot tell us 02:16.942 --> 02:21.257 what an old tool did. A 1927 patent, for example, calls its 02:21.257 --> 02:25.573 invention a spear for oil-well casing or tubing. Its job was recovery: 02:25.573 --> 02:29.529 gripping material in the well so it could be pulled out. 02:29.529 --> 02:32.944 That distinction becomes important when a row of old tools is arranged 02:32.944 --> 02:36.359 in a museum. The object that looks most like a weapon may 02:36.359 --> 02:39.774 belong to the fishing equipment. The broad, blunt object may have been 02:39.774 --> 02:41.481 the one that made the hole. 02:41.481 --> 02:44.745 A tool's purpose is more revealing than its silhouette. 02:44.745 --> 02:49.500 Rotary drilling moves the problem from repeated blows toward continuous rotation. The 02:49.500 --> 02:54.255 drillstring turns the cutting structure, and circulation can move fluid down through 02:54.255 --> 02:59.010 the system and return cuttings toward the surface. During the Turner Valley 02:59.010 --> 03:03.765 era, cable-tool and rotary rigs overlapped; Alberta's history describes rotary equipment becoming 03:03.765 --> 03:05.747 more prevalent during the 1920s. 03:05.747 --> 03:10.243 That overlap matters. An invention date is not the date every crew 03:10.243 --> 03:14.740 changes equipment. People use what they can obtain, repair, power, transport, and 03:14.740 --> 03:17.363 operate in the formations they actually face. 03:17.363 --> 03:21.415 Think about a new tool arriving at a remote location. Its advantage 03:21.415 --> 03:25.467 on paper is only one part of the decision. The crew also 03:25.467 --> 03:29.519 needs the supporting machinery, spare parts, and experience. An improvement at the 03:29.519 --> 03:32.220 cutting face can demand changes throughout the operation. 03:32.220 --> 03:36.540 The first lesson in our timeline is practical: technology spreads through working 03:36.540 --> 03:39.061 systems, not through dates on a wall. 03:39.061 --> 03:43.496 Early rotary fishtail bits scraped formation. That worked much better in some 03:43.496 --> 03:47.931 conditions than in others. In harder rock, wear and lost diameter could 03:47.931 --> 03:52.367 make progress painfully slow. The Hughes two-cone design answered with rotating toothed 03:52.367 --> 03:56.802 cutters that chipped and crushed as the bit turned. ASME identifies the 03:56.802 --> 03:59.390 1909 design as a major engineering landmark. 03:59.390 --> 04:03.487 The Howard Hughes in this part of the story is Howard Robard 04:03.487 --> 04:07.585 Hughes Senior. The patents name the father. The later aviator and filmmaker 04:07.585 --> 04:11.683 was his son, Howard Hughes Junior. The company and the money it 04:11.683 --> 04:14.415 generated became central to the son's business empire. 04:14.415 --> 04:18.346 There is a reason the inventor's name belongs in a drilling podcast. 04:18.346 --> 04:22.277 A formation that is expensive to penetrate can limit the value of 04:22.277 --> 04:26.208 everything beneath it. Changing the cutting mechanism changes what becomes practical to 04:26.208 --> 04:26.535 explore. 04:26.535 --> 04:30.691 The story includes a documented design, a hard drilling problem, and the 04:30.691 --> 04:34.847 business built around a useful solution. It also reminds us to distinguish 04:34.847 --> 04:38.656 an invention from the much larger industry that develops around it. 04:38.656 --> 04:43.383 Hughes filed two related applications on November twentieth, nineteen-oh-eight. Both patents were 04:43.383 --> 04:48.110 issued on August tenth, nineteen-oh-nine. The familiar two-cone arrangement appears in patent 04:48.110 --> 04:52.838 nine hundred thirty thousand, seven hundred fifty-nine. The adjacent patent, ending in 04:52.838 --> 04:56.777 seven hundred fifty-eight, describes another arrangement with three cutting members. 04:56.777 --> 05:01.027 Those two documents preserve experimentation, not just a finished legend. The inventor 05:01.027 --> 05:05.277 was considering how cutting members could fit inside a strong head, how 05:05.277 --> 05:09.527 their bearings could be supported, and how fluid and lubrication could reach 05:09.527 --> 05:11.298 the places they were needed. 05:11.298 --> 05:15.682 Imagine turning two toothed rollers against the rock. New edges keep arriving 05:15.682 --> 05:20.066 at the contact. The complete bit rotates, while its cutters rotate on 05:20.066 --> 05:24.451 their own supports. There are two movements to follow, and both matter. 05:24.451 --> 05:28.548 A sharp tooth is only part of the machine. Something must carry 05:28.548 --> 05:32.645 its load. Something must keep its motion possible. An impressive cutting edge 05:32.645 --> 05:36.742 becomes useful only when the rest of the tool can deliver it 05:36.742 --> 05:38.107 to the rock repeatedly. 05:38.107 --> 05:42.233 The familiar three-cone story has another pair of names. Floyd Scott and 05:42.233 --> 05:46.358 Lewis Garfield appear as inventors on the Hughes Tool Company patent filed 05:46.358 --> 05:50.484 in April nineteen-thirty-three and issued in December nineteen-thirty-four. Its tooth rows interfit, 05:50.484 --> 05:54.610 allowing the cutters to work across the bottom without their teeth colliding. 05:54.610 --> 05:58.735 The patent also describes a twisting component of action; a roller cone 05:58.735 --> 06:02.517 is not simply a set of perfect wheels rolling without slip. 06:02.517 --> 06:06.616 ASME dates commercial introduction of the Tricone to nineteen-thirty-three. That is why 06:06.616 --> 06:10.716 a timeline can legitimately show a commercial milestone in one year and 06:10.716 --> 06:12.765 a patent grant in the next. 06:12.765 --> 06:17.005 To picture the movement, first hold the bit body still and turn 06:17.005 --> 06:21.244 the individual cones in your mind. Then rotate the whole assembly. Each 06:21.244 --> 06:24.070 tooth follows a path through a changing contact. 06:24.070 --> 06:27.947 Watch the coverage. A bit must deal with the centre, the surrounding 06:27.947 --> 06:31.823 bottom, and the outer diameter. Leaving a ring or a central pedestal 06:31.823 --> 06:35.700 of unbroken formation is a different problem from merely owning a sharp 06:35.700 --> 06:36.023 tooth. 06:36.023 --> 06:39.729 Here is the twist in the chronology. Diamond drilling did not begin 06:39.729 --> 06:40.655 after the tricone. 06:40.655 --> 06:45.407 Rodolphe Leschot's United States patent for a diamond rock-boring tool was issued 06:45.407 --> 06:50.160 in July eighteen-sixty-three. It describes diamonds mounted around a tubular crown, cutting 06:50.160 --> 06:54.912 an annular groove and leaving a central core. Water carries away the 06:54.912 --> 06:58.080 debris. That is decades before Hughes's two-cone patents. 06:58.080 --> 07:02.256 Imagine a narrow ring being removed around a cylinder of rock. The 07:02.256 --> 07:06.432 centre remains available as a sample. That goal differs from reducing the 07:06.432 --> 07:07.825 entire bottom to cuttings. 07:07.825 --> 07:11.885 The distinction is especially useful for a geologist. A bit can be 07:11.885 --> 07:15.945 judged by how efficiently it makes a full hole, or by how 07:15.945 --> 07:20.006 well it helps recover material that preserves geological relationships. A continuous core 07:20.006 --> 07:24.066 and a bag of cuttings answer overlapping questions, but they are not 07:24.066 --> 07:25.082 the same evidence. 07:25.082 --> 07:30.752 So imagine the history as several branches: percussion, roller cones, natural-diamond coring, 07:30.752 --> 07:36.423 and later synthetic-diamond cutting. Useful ideas can develop alongside one another and 07:36.423 --> 07:38.786 meet again in different applications. 07:38.786 --> 07:43.571 A polycrystalline diamond compact, or PDC cutter, combines a diamond cutting layer 07:43.571 --> 07:48.355 with a supporting carbide substrate. On a conventional PDC bit, cutters are 07:48.355 --> 07:53.139 mounted in the bit's blades and shear rock as the assembly rotates. 07:53.139 --> 07:57.358 A very hard cutting material is promising. But the surrounding engineering decides 07:57.358 --> 07:59.115 whether it survives a run. 07:59.115 --> 08:04.042 Callin Joe Kerr's technical history traces PDC development from the nineteen-seventies. Early 08:04.042 --> 08:08.969 field testing exposed practical weaknesses: cutter attachment, impact damage, inadequate cutter exposure, 08:08.969 --> 08:13.895 and cleaning problems. The history describes improvements in cutter support and brazing 08:13.895 --> 08:18.822 as the technology developed. It is evidence of a difficult engineering progression, 08:18.822 --> 08:22.517 rather than instant success when synthetic diamond first appeared. 08:22.517 --> 08:26.273 Think of a good knife held in a weak handle. Improving the 08:26.273 --> 08:30.029 edge alone does not make the complete tool reliable. The cutter has 08:30.029 --> 08:33.785 to remain attached, its support has to survive, and broken rock has 08:33.785 --> 08:37.542 to leave the cutting area. Each successful run tests the whole arrangement. 08:37.542 --> 08:41.507 When someone says matrix-body PDC, they are describing the body that supports 08:41.507 --> 08:45.472 the cutting structure. They are not naming a separate cutting mechanism that 08:45.472 --> 08:47.454 comes after PDC on the timeline. 08:47.454 --> 08:52.488 Steel and tungsten-carbide matrix bodies offer different balances of strength, wear resistance, 08:52.488 --> 08:57.521 and design freedom. SLB's technical overview explains why steel supports relatively tall 08:57.521 --> 09:02.555 blades and open flow paths, while matrix bodies provide wear resistance but 09:02.555 --> 09:05.071 require attention to brittleness and geometry. 09:05.071 --> 09:09.296 That makes a useful question for our next episode: what problem is 09:09.296 --> 09:11.408 this particular body intended to solve? 09:11.408 --> 09:15.190 Consider blade shape, the space between blades, and the routes available for 09:15.190 --> 09:18.973 fluid and cuttings. A bit that looks solid and impressive on a 09:18.973 --> 09:22.755 display stand still has to function at the bottom of a well. 09:22.755 --> 09:25.592 The empty spaces are part of its design too. 09:25.592 --> 09:29.625 Now zoom in from the entire bit to one cutter. Back rake 09:29.625 --> 09:33.657 and side rake describe different parts of its orientation. Changing that orientation 09:33.657 --> 09:36.345 changes how the cutting face meets the rock. 09:36.345 --> 09:40.940 A published single-cutter study by Rajabov and colleagues tested more than one 09:40.940 --> 09:45.535 hundred fifty combinations. It found that rake angles, depth of cut, rock 09:45.535 --> 09:50.131 type, and pressure affected cutting energy and aggressiveness. Lower back rake improved 09:50.131 --> 09:54.726 cutting efficiency in the reported comparisons, while cutter durability remained a tradeoff. 09:54.726 --> 09:59.321 Those results are experiments under stated conditions, not a universal instruction to 09:59.321 --> 10:01.619 select one angle for every bit. 10:01.619 --> 10:05.659 Picture the cutter from the side, then from above. Its backward lean 10:05.659 --> 10:09.699 and its sideways orientation are different adjustments. A number beside it means 10:09.699 --> 10:13.739 little until we know the reference from which that angle was measured. 10:13.739 --> 10:17.624 Now add a second cutter. The design question changes again. Does it 10:17.624 --> 10:21.510 meet fresh rock, a ridge left by its neighbour, or material that 10:21.510 --> 10:25.395 has already fractured? A complete bit is an arrangement of interacting contacts, 10:25.395 --> 10:28.956 not a photograph of one ideal cutter repeated around a circle. 10:28.956 --> 10:33.811 Hybrid bits bring roller-cone and fixed PDC cutting elements into the same 10:33.811 --> 10:38.666 design. Baker Hughes describes its Kymera family as combining crushing with shearing, 10:38.666 --> 10:43.521 with intended benefits in difficult and interbedded applications. Manufacturer performance claims need 10:43.521 --> 10:48.377 their operating context; the existence of both mechanisms is the essential point 10:48.377 --> 10:48.781 here. 10:48.781 --> 10:52.885 The story has come full circle. An older mechanism can remain useful 10:52.885 --> 10:54.254 inside a newer tool. 10:54.254 --> 10:58.694 The better comparison asks what the formation demands, how the assembly behaves, 10:58.694 --> 11:03.134 and what evidence shows that the bit completed the intended interval effectively. 11:03.134 --> 11:07.428 Sometimes the most impressive figure is speed. Sometimes it is a section 11:07.428 --> 11:11.722 completed without another trip. Sometimes it is the ability to maintain the 11:11.722 --> 11:14.943 planned trajectory while the cutting structure survives changing rock. 11:14.943 --> 11:19.856 Across this history, the same conversations keep returning. How does the rock 11:19.856 --> 11:24.770 break? What supports the cutter? Where do the fragments go? What does 11:24.770 --> 11:28.455 the tool cost over the interval it actually completes? 11:28.455 --> 11:32.742 For the wellsite geologist, that creates a useful habit. Treat a change 11:32.742 --> 11:37.029 in drilling response as evidence that needs context. Put the lithology, cuttings, 11:37.029 --> 11:41.316 GR, drilling parameters, and operating changes beside one another before telling the 11:41.316 --> 11:43.816 story of what the bit has encountered. 11:43.816 --> 11:47.812 In the next part, we will move inside the modern PDC bit: 11:47.812 --> 11:51.807 steel versus matrix, back rake and side rake, blade and cutter geometry, 11:51.807 --> 11:55.802 and the difference between a design that cuts aggressively and a system 11:55.802 --> 11:56.801 that drills efficiently. 11:56.801 --> 12:01.876 This is GeoNavigate Industry Chatter. From the spudding bit to synthetic diamond, 12:01.876 --> 12:05.682 the tool changes. The formation still gets a vote.