Strategic Infrastructure

Oil & Gas Extraction

Oil and gas extraction covers upstream hydrocarbon production, including onshore and offshore fields, wells, production platforms, floating production vessels and field-level gathering and separation systems. One of the capabilities of Resource Infrastructure.

International families: 38k2015 to 2024
Leading country: United States3.9× the next
All families: 194khome filings included
Over five years: Falling2020 to 2024 against the five before

Year by year

Patent families by country of origin and the year of the earliest filing, 2000 to 2025; 2025 is a part year, still filling in. International families are those for which protection was sought beyond one country.

Volume

International patent families in the capability, by the year of the earliest filing.

Source: Global Institute for National Capability (GINC), 2026. Underlying patents from 107 patent offices, IFI CLAIMS and Google

Share by country

Each country's share of the year's international families, in per cent: the capability's five largest countries of origin, 2015 to 2024, and the rest of the world.

Source: Global Institute for National Capability (GINC), 2026. Underlying patents from 107 patent offices, IFI CLAIMS and Google

Country leaderboard

International patent families, 2015 to 2024, by country of origin. Growth compares the latest five full years with the five before.

Ten largest

United States

China

Saudi Arabia

France

Norway

United Kingdom

Canada

Netherlands

Germany

Japan

17,083

4,363

2,572

1,718

1,707

1,515

1,497

1,243

1,012

794


1	United States	17,083	45.0%	0.7×	24,409
2	China	4,363	11.5%	1.8×	136,473
3	Saudi Arabia	2,572	6.8%	1.6×	3,956
4	France	1,718	4.5%	0.9×	1,967
5	Norway	1,707	4.5%	0.7×	2,251
6	United Kingdom	1,515	4.0%	0.6×	1,865
7	Canada	1,497	3.9%	0.5×	2,200
8	Netherlands	1,243	3.3%	0.9×	1,392
9	Germany	1,012	2.7%	0.7×	1,318
10	Japan	794	2.1%	0.7×	2,837
11	Australia	437	1.2%	1.0×	661
12	South Korea	421	1.1%	0.8×	4,943
13	Denmark	353	0.9%	0.9×	379
14	Sweden	336	0.9%	1.5×	373
15	Russia	307	0.8%	0.8×	4,730
16	Brazil	299	0.8%	0.9×	592
17	Italy	273	0.7%	0.6×	366
18	Switzerland	253	0.7%	0.5×	282
19	Finland	243	0.6%	1.1×	269
20	Spain	125	0.3%	0.9×	148
21	Singapore	107	0.3%	0.9×	125
22	India	90	0.2%	1.0×	113
23	Austria	73	0.2%	0.8×	88
24	Belgium	71	0.2%	0.8×	94
25	Israel	69	0.2%	0.9×	80
26	Liechtenstein	52	0.1%	0.7×	52
27	Taiwan	50	0.1%	0.6×	169
28	South Africa	48	0.1%	0.7×	51
29	Türkiye	44	0.1%	1.8×	101
30	Ireland	44	0.1%	1.4×	50
31	Mexico	44	0.1%	0.8×	177
32	Malaysia	42	0.1%	0.8×	71
33	New Zealand	38	0.1%	0.6×	55
34	Poland	26	0.1%	0.5×	259
35	Luxembourg	23	0.1%	0.0×	25
36	Cayman Islands	22	0.1%	0.3×	24
37	Portugal	15	0.0%	0.5×	21
38	Hungary	15	0.0%	0.2×	38
39	Czechia	11	0.0%	1.8×	23
40	Hong Kong	8	0.0%	1.7×	17

Applicants

The largest applicants by international patent families, 2015 to 2024: across the world, then within each of the five countries with the most families in Oil & Gas Extraction. Names are as held in the source and are not consolidated across subsidiaries.

Global

37,938 international families

HALLIBURTON ENERGY SERVICES INC · United States

SCHLUMBERGER TECHNOLOGY CORP · United States

SAUDI ARABIAN OIL CO · Saudi Arabia

SCHLUMBERGER CA LTD · United States

SERVICES PETROLIERS SCHLUMBERGER · United States

SCHLUMBERGER TECHNOLOGY BV · United States

4,848

2,812

2,650

2,506

2,496

2,029

United States

17,083 international families

HALLIBURTON ENERGY SERVICES INC

SCHLUMBERGER TECHNOLOGY CORP

SCHLUMBERGER CA LTD

SERVICES PETROLIERS SCHLUMBERGER

SCHLUMBERGER TECHNOLOGY BV

BAKER HUGHES A GE CO LLC

4,840

1,671

1,503

1,466

1,272

920

China

4,363 international families

UNIV SOUTHWEST PETROLEUM

CHINA NAT PETROLEUM CORP

PETROCHINA CO LTD

UNIV CHINA PETROLEUM EAST CHINA

CHINA PETROLEUM & CHEM CORP

UNIV CHINA MINING

364

280

249

222

178

Saudi Arabia

2,572 international families

SAUDI ARABIAN OIL CO

ARAMCO SERVICES CO

ARAMCO AMERICAS

ARAMCO FAR EAST BEIJING BUSINESS SERVICES CO LTD

UNIV KING FAHD PET & MINERALS

UNIV KING ABDULLAH SCI & TECH

2,539

1,915

France

1,718 international families

SCHLUMBERGER TECHNOLOGY CORP

SERVICES PETROLIERS SCHLUMBERGER

SCHLUMBERGER CA LTD

GEOQUEST SYSTEMS BV

SCHLUMBERGER TECHNOLOGY BV

TOTALENERGIES ONETECH

528

453

317

215

179

Norway

1,707 international families

1.0% shared · 594 families in both

United States

China

Japan

South Korea

Germany

5,013

4,301

3,866

1,986

1,665

Crosswalk

How Oil & Gas Extraction is matched to the patent classifications. The entries below were chosen for it; each stands for itself and everything beneath it in the scheme, 965 Cooperative entries in all. A patent family counts when any of its codes, in either scheme and at any office, falls under one of them. Codes since retired are placed under the entries that replaced them.

Entry	Title in the scheme	Why it is chosen	CPC codes	IPC codes	Documents
E21B	Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells	Drilling, completing and producing from wells	754	388	2,247,698
C09K8/00	Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations	Drilling muds, fracturing and well-treatment fluids	110	75	357,479
E02B17/00	Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor	Fixed and jack-up offshore platforms	43	5	71,823
B63B35/44	Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices	Floating drilling and production platforms	15	1	68,392
F04B47/00	Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps	Pumps for lifting fluids from deep wells	14	8	22,158
G01V1/00	Seismology; Seismic or acoustic prospecting or detecting	Seismic surveying for subsurface exploration	102	44	243,058
G01V1/01	Measuring or predicting earthquakes	Left out

CPC and IPC codes are the codes in use on patent documents, at any office, that fall under the entry. Documents is the larger of the two schemes' counts of documents carrying one of them. An entry with no IPC codes can be told apart only in the Cooperative scheme.

The Cooperative codes in use that count towards Oil & Gas Extraction: 1,038 codes on 3,007,668 documents. The 150 most used are listed; the full list is in the cpc-to-capability.csv download.

Code	Title	Under entry	How placed	Documents
E21B43/26	Methods for stimulating production by forming crevices or fractures	E21B	In the scheme	35,058
E21B47/00	Survey of boreholes or wells	E21B	In the scheme	30,430
E21B49/00	Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells	E21B	In the scheme	29,960
B63B35/44	Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices	B63B35/44	In the scheme	27,831
E21B47/06	Measuring temperature or pressure	E21B	In the scheme	25,519
E21B44/00	Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions	E21B	In the scheme	24,816
E21B47/12	Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling	E21B	In the scheme	20,456
E21B33/13	Methods or devices for cementing, for plugging holes, crevices or the like	E21B	In the scheme	19,651
E21B43/16	Enhanced recovery methods for obtaining hydrocarbons	E21B	In the scheme	19,199
E21B41/00	Equipment or details not covered by groups E21B15/00 - E21B40/00	E21B	In the scheme	19,181
E21B43/12	Methods or apparatus for controlling the flow of the obtained fluid to or in wells	E21B	In the scheme	18,249
E21B33/12	Packers; Plugs	E21B	In the scheme	17,851
E21B43/267	Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping	E21B	In the scheme	17,264
E21B34/06	Valve arrangements for boreholes or wells in wells	E21B	In the scheme	16,077
C09K8/035	Organic additives	C09K8/00	In the scheme	15,742
E21B7/04	Directional drilling	E21B	In the scheme	15,291
E21B17/042	Threaded	E21B	In the scheme	14,957
C09K8/68	Compositions based on water or polar solvents containing organic compounds	C09K8/00	In the scheme	14,517
E21B47/13	Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency	E21B	In the scheme	13,943
C09K8/584	Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants	C09K8/00	In the scheme	13,626
E21B34/10	Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole	E21B	In the scheme	13,401
E21B33/1208	Packers; Plugs characterised by the construction of the sealing or packing means	E21B	In the scheme	13,145
E21B21/08	Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure	E21B	In the scheme	13,106
E21B43/00	Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells	E21B	In the scheme	12,939
G01V1/282	Application of seismic models, synthetic seismograms	G01V1/00	In the scheme	12,922
E21B17/00	Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings	E21B	In the scheme	12,693
E21B34/14	Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools	E21B	In the scheme	12,277
E21B33/14	Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes	E21B	In the scheme	12,270
E21B43/14	Obtaining from a multiple-zone well	E21B	In the scheme	12,054
E21B43/24	Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection	E21B	In the scheme	11,790
E21B23/01	Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like	E21B	In the scheme	11,635
E21B23/00	Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells	E21B	In the scheme	11,532
G01V1/28	Processing seismic data, e.g. for interpretation or for event detection	G01V1/00	In the scheme	11,431
E21B49/08	Obtaining fluid samples or testing fluids, in boreholes or wells	E21B	In the scheme	10,984
E21B2200/20	Computer models or simulations, e.g. for reservoirs under production, drill bits	E21B	In the scheme	10,932
E21B47/07	Temperature	E21B	In the scheme	10,866
E21B2200/06	Sleeve valves	E21B	In the scheme	10,694
G01V1/306	Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles	G01V1/00	In the scheme	10,642
E21B43/103	Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like	E21B	In the scheme	10,526
E21B23/06	Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers	E21B	In the scheme	10,450
E21B43/128	Adaptation of pump systems with down-hole electric drives	E21B	In the scheme	10,328
E21B33/138	Plastering the borehole wall; Injecting into the formation	E21B	In the scheme	10,323
C09K8/588	Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers	C09K8/00	In the scheme	10,012
E21B43/2607	Surface equipment specially adapted for fracturing operations	E21B	In the scheme	9,973
E21B19/16	Connecting or disconnecting pipe couplings or joints	E21B	In the scheme	9,917
C09K8/467	Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes	C09K8/00	In the scheme	9,905
E21B47/01	Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like	E21B	In the scheme	9,790
C09K8/80	Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open	C09K8/00	In the scheme	9,786
E21B43/20	Displacing by water	E21B	In the scheme	9,764
E21B7/02	Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting	E21B	In the scheme	9,750
G01V1/30	Analysis	G01V1/00	In the scheme	9,647
E21B34/08	Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained	E21B	In the scheme	9,616
E21B43/10	Setting of casings, screens, liners or the like in wells	E21B	In the scheme	9,482
G01V1/38	Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas	G01V1/00	In the scheme	9,476
E21B17/01	Risers	E21B	In the scheme	9,382
E21B37/00	Methods or apparatus for cleaning boreholes or wells	E21B	In the scheme	9,302
G01V1/50	Analysing data	G01V1/00	In the scheme	9,287
B63B2035/446	Floating structures carrying electric power plants for converting wind energy into electric energy	B63B35/44	In the scheme	9,192
E21B21/10	Valve arrangements in drilling-fluid circulation systems	E21B	In the scheme	9,162
E21B43/08	Screens or liners	E21B	In the scheme	9,103
C09K8/52	Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning	C09K8/00	In the scheme	9,019
E21B15/00	Supports for the drilling machine, e.g. derricks or masts	E21B	In the scheme	8,935
E21B4/02	Fluid rotary type drives	E21B	In the scheme	8,935
E21B43/01	Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations	E21B	In the scheme	8,905
E21B47/10	Locating fluid leaks, intrusions or movements	E21B	In the scheme	8,685
E21B7/20	Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes	E21B	In the scheme	8,666
G01V1/3808	Seismic data acquisition, e.g. survey design	G01V1/00	In the scheme	8,649
B63B35/4413	Floating drilling platforms, e.g. carrying water-oil separating devices	B63B35/44	In the scheme	8,522
E21B47/18	Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry	E21B	In the scheme	8,397
E21B47/022	Determining slope or direction of the borehole, e.g. using geomagnetism	E21B	In the scheme	8,357
E21B47/017	Protecting measuring instruments	E21B	In the scheme	8,234
E21B47/09	Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes	E21B	In the scheme	8,110
E21B33/03	Well heads; Setting-up thereof	E21B	In the scheme	8,096
E21B7/06	Deflecting the direction of boreholes	E21B	In the scheme	8,066
E21B43/04	Gravelling of wells	E21B	In the scheme	7,980
E21B47/024	Determining slope or direction of devices in the borehole	E21B	In the scheme	7,945
E21B7/046	Directional drilling horizontal drilling	E21B	In the scheme	7,753
E21B34/063	Valve or closure with destructible element, e.g. frangible disc	E21B	In the scheme	7,749
E21B21/00	Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor	E21B	In the scheme	7,691
E21B43/34	Arrangements for separating materials produced by the well	E21B	In the scheme	7,690
E02B17/00	Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor	E02B17/00	In the scheme	7,642
E21B33/04	Casing heads; Suspending casings or tubings in well heads	E21B	In the scheme	7,636
E21B47/135	Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency using light waves, e.g. infrared or ultraviolet waves	E21B	In the scheme	7,636
G01V1/40	Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging	G01V1/00	In the scheme	7,636
E21B19/22	Handling reeled pipe or rod units, e.g. flexible drilling pipes	E21B	In the scheme	7,599
E21B7/00	Special methods or apparatus for drilling	E21B	In the scheme	7,530
E21B33/134	Bridging plugs	E21B	In the scheme	7,480
E21B17/1078	Stabilisers or centralisers for casing, tubing or drill pipes	E21B	In the scheme	7,478
C09K8/528	Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates	C09K8/00	In the scheme	7,350
E21B43/121	Lifting well fluids	E21B	In the scheme	7,313
G01V1/36	Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy	G01V1/00	In the scheme	7,312
C09K8/54	Compositions for in situ inhibition of corrosion in boreholes or wells	C09K8/00	In the scheme	7,302
E21B43/25	Methods for stimulating production	E21B	In the scheme	7,243
C09K8/524	Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes	C09K8/00	In the scheme	7,216
E21B37/06	Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances	E21B	In the scheme	7,196
E21B33/128	Packers; Plugs with a member expanded radially by axial pressure	E21B	In the scheme	7,118
E21B41/0085	Adaptations of electric power generating means for use in boreholes	E21B	In the scheme	7,056
E21B33/038	Connectors used on well heads, e.g. for connecting blow-out preventer and riser	E21B	In the scheme	6,974
E21B33/127	Packers; Plugs with inflatable sleeve	E21B	In the scheme	6,974
C09K8/74	Eroding chemicals, e.g. acids combined with additives added for specific purposes	C09K8/00	In the scheme	6,969
C09K8/685	Compositions based on water or polar solvents containing organic compounds containing cross-linking agents	C09K8/00	In the scheme	6,968
E21B7/061	Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock	E21B	In the scheme	6,967
C09K8/62	Compositions for forming crevices or fractures	C09K8/00	In the scheme	6,836
E02B2017/0091	Offshore structures for wind turbines	E02B17/00	In the scheme	6,814
E21B3/02	Surface drives for rotary drilling	E21B	In the scheme	6,788
E21B34/142	Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons	E21B	In the scheme	6,744
E21B33/06	Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers	E21B	In the scheme	6,696
E21B34/066	Valve arrangements for boreholes or wells in wells electrically actuated	E21B	In the scheme	6,694
E21B33/035	Well heads; Setting-up thereof specially adapted for underwater installations	E21B	In the scheme	6,682
E21B43/305	Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well	E21B	In the scheme	6,630
E21B2200/05	Flapper valves	E21B	In the scheme	6,601
E21B2200/04	Ball valves	E21B	In the scheme	6,579
E21B2200/22	Fuzzy logic, artificial intelligence, neural networks or the like	E21B	In the scheme	6,537
E21B7/28	Enlarging drilled holes, e.g. by counterboring	E21B	In the scheme	6,535
E21B23/02	Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing	E21B	In the scheme	6,508
E21B43/105	Expanding tools specially adapted therefor	E21B	In the scheme	6,483
E21B4/14	Fluid operated hammers	E21B	In the scheme	6,481
C09K8/512	Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents	C09K8/00	In the scheme	6,442
C09K8/46	Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement	C09K8/00	In the scheme	6,440
G01V1/364	Seismic filtering	G01V1/00	In the scheme	6,378
E21B19/14	Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole	E21B	In the scheme	6,326
E21B41/0007	Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations	E21B	In the scheme	6,279
E21B17/02	Couplings; joints	E21B	In the scheme	6,257
E21B10/46	Drill bits characterised by wear resisting parts, e.g. diamond inserts	E21B	In the scheme	6,226
C09K8/58	Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids	C09K8/00	In the scheme	6,216
E21B43/164	Injecting CO2 or carbonated water	E21B	In the scheme	6,095
E21B21/065	Separating solids from drilling fluids	E21B	In the scheme	6,057
E21B17/003	Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings with electrically conducting or insulating means	E21B	In the scheme	6,040
E21B7/025	Rock drills, i.e. jumbo drills	E21B	In the scheme	6,023
C09K8/805	Coated proppants	C09K8/00	In the scheme	6,016
E21B33/0355	Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads	E21B	In the scheme	5,995
C09K8/602	Compositions for stimulating production by acting on the underground formation containing surfactants	C09K8/00	In the scheme	5,933
E21B17/07	Telescoping joints for varying drill string lengths; Shock absorbers	E21B	In the scheme	5,884
G01V1/301	Analysis for determining seismic cross-sections or geostructures	G01V1/00	In the scheme	5,863
E21B34/16	Control means therefor being outside the borehole	E21B	In the scheme	5,862
C09K8/03	Specific additives for general use in well-drilling compositions	C09K8/00	In the scheme	5,861
E21B3/022	Top drives	E21B	In the scheme	5,859
E21B7/18	Drilling by liquid or gas jets, with or without entrained pellets	E21B	In the scheme	5,778
E21B47/005	Monitoring or checking of cementation quality or level	E21B	In the scheme	5,766
E21B47/04	Measuring depth or liquid level	E21B	In the scheme	5,766
C09K8/36	Water-in-oil emulsions	C09K8/00	In the scheme	5,756
E21B21/01	Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes	E21B	In the scheme	5,725
G01V1/303	Analysis for determining velocity profiles or travel times	G01V1/00	In the scheme	5,711
E21B10/567	Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts	E21B	In the scheme	5,681
E21B49/10	Obtaining fluid samples or testing fluids, in boreholes or wells using side-wall fluid samplers or testers	E21B	In the scheme	5,602
E21B49/0875	Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters	E21B	In the scheme	5,585
E21B19/00	Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables	E21B	In the scheme	5,528
E21B17/08	Casing joints	E21B	In the scheme	5,490
E21B43/2401	Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity	E21B	In the scheme	5,475
E21B21/003	Means for stopping loss of drilling fluid	E21B	In the scheme	5,454

Match: Direct

The capability is itself a technology or a kind of physical system, and the classification names it. E21B also covers water and geothermal wells, and E02B17/00 also covers offshore wind foundations. The crosswalk is a first pass that nobody has reviewed.

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