Asbestos Exposure in Oil and Gas Drilling Crews

If you worked the rigs as a mud man, derrickman, roughneck, roustabout, or floor hand, or if someone in your family did, and a mesothelioma, lung cancer, asbestosis, or other asbestos diagnosis has now come in, this page is the place to start. The same dust reached the spouses and children who washed the work clothes, and the other hands who shared the rig floor and the mud room where the work was done.

A drilling crew breathed asbestos from more than one direction. The biggest source was the work itself: for decades, asbestos was added to drilling mud as a dry, dusty powder, and crews sacked, poured, and mixed it into the pit by hand, releasing fiber before it ever wetted down. Industrial hygiene testing during this mud-additive handling measured airborne asbestos from 0.4 up to 5.5 fibers per cubic centimeter, many times today's federal limit. The air around the crew held more, from the mud-pump packing, the gaskets, the drawworks brakes, and the insulation on the rig's hot machinery. A hand didn't have to be the one cutting the sack open to breathe it.

You don't need to remember which company's mud additive or gaskets you used, and you don't need old job records or pay stubs in hand. The bankruptcy trusts that pay many of these claims are built to compensate exactly this kind of work: for mesothelioma, even brief asbestos exposure on a worksite that used it is typically enough to qualify, so you don't have to prove a heavy dose. If you can say "I worked the rigs for thirty years" or "my husband was a mud man on the Gulf Coast," we have a starting point.

Why oil and gas drilling crews were exposed to asbestos

Drilling crews handled asbestos because of one product in particular: for decades, asbestos was mixed into drilling mud (the fluid pumped down the well) to thicken it and stop it from leaking away into the rock. It arrived at the rig as a dry, dusty powder in paper sacks, and turning that powder into mud was hands-on, repetitive work that put fiber straight into the air.

The exposure came from the ordinary, repeated motions of the job, not from anything unusual:

• Sacking and pouring the mud additive. Crews cut open the sacks and dumped the dry additive into the mud pit or hopper by hand. The powder clouded up as it poured, and the fiber went airborne before it ever touched the mud and wetted down. Testing during this dry-additive handling measured up to 5.5 f/cc, dozens of times today's federal limit.
• Mixing and treating the mud. The mud man and derrickman worked the pits through the shift, adding and blending material, often in an enclosed mud room or shaker house where the dust had nowhere to go and was breathed over and over.
• Working the pumps and the rig machinery. Repacking the mud pumps, changing gaskets, and working around the drawworks brakes and insulated steam lines released fiber from the other asbestos products around the crew.
• Breathing what hung in the air. On a rig, the mud handling, the machinery, and any insulation work shared the same air, so a hand breathed fiber whether or not he was the one handling the sacks at that moment.

Two things multiplied all of this. The dustiest work often happened in the worst possible place for it, the closed mud room, where there was little ventilation and the fiber hung and was rebreathed rather than carried away. And it happened over and over for an entire working life. A career hand opened and poured sacks, mixed mud, and repacked pumps countless times across twenty, thirty, or forty years, and tearing out old, friable (crumbly and dusty), degraded insulation and packing released far more fiber than new material did.

Through all of it, the men doing the work were given no warning and no protection. They worked bare-handed in the dust and went home in dusty clothes to their families, while the companies that made the products and ran the rigs knew what the dust was doing.

The asbestos products a drilling crew handled, and why they add up to more than one claim

Over a career, a drilling hand handled several different asbestos products, each made by a different set of companies, and that combination is what shapes the claim. Understanding the products is how we identify who's responsible and which claims you can bring.

Asbestos drilling-mud additives. This was the trade's signature exposure. The additive came to the rig as a dry, dusty powder in sacks, and crews cut it open and poured it into the pit by hand, which is when the fiber went into the air. These products were sold under names like Visbestos, Arcovis 953, and Magcobar's Flosal. Some of the makers are still in business and can be sued directly, like Union Carbide, the maker of Visbestos; others, like the Magcobar line now handled through the DII Industries bankruptcy trust, pay through trusts. See how asbestos drilling-mud additives caused exposure.

Mud-pump packing and gaskets. The mud pumps, valves, and flanged joints on the rig were sealed with asbestos packing and gaskets to hold against pressure, and repacking a pump or changing a gasket meant pulling out old material that years of heat and use had baked hard, which released fiber. The makers behind these products include companies now covered by bankruptcy trusts alongside still-solvent manufacturers you can sue directly. See how asbestos gaskets and packing caused exposure.

Rig insulation. The boilers, steam lines, engine exhaust, and other hot equipment on the rig were lagged with asbestos insulation, and cutting into it or tearing it out to make repairs put more fiber in the air. These trace back to the largest names in the insulation industry, most of which now pay through trusts. See how asbestos pipe and block insulation caused exposure.

This is why a drilling crew's case is rarely a single claim. Because the work touched mud additives, packing, gaskets, and insulation from many different manufacturers, the typical recovery runs against several bankruptcy trusts at once, plus lawsuits against the makers still in business and the contractors and operators who controlled the worksite. You don't need to remember which company made the additive you poured in 1974 or the packing you pulled in 1981. Give us the work history, and we trace each product back to its maker, and each maker to its trust or its place in a lawsuit.

Where you worked, and why the setting still matters

A drilling crew carried the exposure from rig to rig, so the job put workers at risk across the whole oil patch. Where the work happened still matters to the case, though, because it decides which contractors and operators can be held responsible as premises defendants, and whether federal programs come into play on top of the trust and lawsuit claims.

A few settings account for much of the heaviest drilling-crew exposure:

• Land rigs across the oil patch. The Gulf Coast, Permian Basin, Mid-Continent, and California fields ran the same mud systems, and the drilling contractors and operators who controlled those sites can be premises defendants.
• Offshore platforms and drilling vessels. Offshore rigs packed machinery and mud handling into tight quarters. Work on a fixed platform on the Outer Continental Shelf (the federal waters beyond the state line) can open Longshore and Harbor Workers' Compensation Act (LHWCA) benefits, and crews who worked aboard drillships and other offshore drilling vessels may have Jones Act claims (the federal law that lets a seaman sue an employer for an injury at sea), both alongside the civil case. Shipyard and maritime asbestos exposure.
• Refineries and petrochemical plants. Crews who crossed over into refinery and plant work moved among miles of insulated, gasketed process piping. Petrochemical and refinery asbestos exposure.

If your loved one worked offshore, on the Outer Continental Shelf, or for a federal operation, tell us. Those settings often add benefit channels that run in parallel with everything else.

What the asbestos industry's own magazine said about the oil fields

The trade journal Asbestos was written for the companies that mined, made and sold asbestos. In 1932 a Tulsa writer, crediting Johns-Manville field engineers, called the oil industry "one of the largest markets for asbestos," running "from the drilling well to the loaded tank car" (Asbestos, Sept. 1932).

On the rig and the lease

The magazine described oil-field work done with asbestos in hand:

• When oil-field workers built power plant foundations, they poured a foot of concrete, laid down paper, and spread "a layer of short staple asbestos fibre" an inch deep, layer after layer. When staple fiber ran short, "floor sweepings, asbestos cuttings, etc." were used instead (Asbestos, June 1935).
• Abandoned wells were plugged with containers of plastic cement mixed with short-fiber asbestos, up to 60% of the bulk. As many as a hundred plugs were kept ready "on the average oil-lease" (Asbestos, Mar. 1941). The same article said this sealing work "is carried out by the oil-field crew without special equipment," and that asbestos waste and floor sweepings often stood in for standard fiber (Asbestos, Mar. 1941).
• In the Ohio, West Virginia and Kentucky fields, each joint of a well liner was wrapped in asbestos paper before it was run, so that steam could be sent down to clear paraffin from the oil sand (Asbestos, June 1934).
• To clean stored crude, lease operators stirred tanks with a mop made of asbestos fiber and then shook the residue off it (Asbestos, Sept. 1938).
• Drilling boilers were being covered with asbestos insulation by 1932 (Asbestos, Sept. 1932).

Brakes, packing and hose

The magazine named makers of brake lining for drilling rigs. Allbestos Corporation of Philadelphia began weaving brake lining in 1921, in sizes up to 12 by 1¼ inches "for oil-well drilling rigs" (Asbestos, Feb. 1972). Garlock's 701 brake lining, made of "asbestos cloth" and rubber, was developed for oil fields among other industries (Asbestos, Nov. 1931). In 1950 National Supply Co. took on Raybestos-Manhattan's "rubber and asbestos products" for the California oil fields, including friction material for drawworks and mechanical packings (Asbestos, Sept. 1950).

Well fires

The magazine also reported asbestos used against well fires. At a 1936 casing-top fire, the magazine said, "asbestos fibre, spread upon the derrick floor" held the burning oil, and asbestos cloth mats shielded the machinery (Asbestos, June 1936).

Asbestos in drilling mud

The magazine's patent columns list drilling-fluid recipes built on asbestos. Patents are inventions, not proof of what went down a given hole, but they show who was working on it. Continental Oil patented an oil-base drilling mud of "petroleum and asbestos," naming Johns-Manville fiber (Asbestos, May 1958). A National Lead patent called for 5 to 50 pounds of chrysotile asbestos "per barrel of fluid" (Asbestos, Sept. 1961). Phillips Petroleum (1966), Pan American Petroleum (1971), Standard Oil of Indiana (1978) and Dresser Industries (1980) patented asbestos lost-circulation slurries or drilling-fluid additives (Asbestos, July 1966; Jan. 1972; Feb. 1979; Aug. 1980). By 1981 the magazine reported that short asbestos fibers made up "5% of the composition of drilling mud" used for oil and gas (Asbestos, Mar. 1981).

None of these pages says anything about dust or about the health of the men who did this work.

How a drilling crew's case can come together

The following is a composite example, not a real client, but it reflects how these cases typically come together in our experience.

Roy spent twenty-eight years on drilling crews, working his way from roustabout to derrickman and mud hand across the Gulf Coast, the Permian Basin, and a stretch of years on offshore rigs. The work was the same wherever the rig stood: cut open the sacks of dry mud additive and dump them into the pit, mix and treat the mud through the shift, and keep the pumps and pits running, often in a closed mud room where the powder hung in the air. He pulled packing out of the mud pumps and worked around insulated steam lines and the drawworks brakes without ever thinking about what the dust was. In early 2026, after a season of breathlessness and chest pain he'd blamed on a lifetime of hard work, a biopsy confirmed pleural mesothelioma of the epithelioid type.

For Roy's family, the case moves on several tracks at once, which is typical for the trade. Trust claims go in against the makers of the mud additives and the other asbestos products he handled across his career, several different companies and several different trusts. Lawsuits go against the additive makers still in business and against the drilling contractors and operators who controlled the rigs where he worked. Because he spent several years offshore, his time on the Outer Continental Shelf may open Longshore benefits, and any years aboard a drilling vessel may support a seaman's claim, both running parallel to the civil case. Mesothelioma is treated at a handful of specialized centers, and getting Roy to the right one may mean travel, so the firm advances the cost of travel and lodging when the best center isn't close to home. How legal recovery funds mesothelioma treatment access. Roy's wife, who shook out and laundered his dust-heavy work clothes for years, is eligible for free asbestos health screening as part of the representation. The screening is a chest X-ray read by a B-reader, with a CT scan if needed; it looks for asbestos-related changes in the lungs and isn't a diagnosis or a reliable way to find mesothelioma early.

This example is general. Every case depends on the diagnosis, the exposure history, the dates, the defendants, the applicable law, and the available evidence.

Sources of compensation for oil and gas drilling crews

A drilling crew's recovery usually comes from more than one place, and the different channels run in parallel without canceling one another out. We file across all of them that apply.

• Asbestos bankruptcy trusts. The companies that made the mud additives and other asbestos products he handled and later went bankrupt set aside money in trusts to pay the people they harmed, including the trust that now handles the Magcobar line (DII Industries). These are paper claims that don't require a lawsuit or a courtroom, and a single career often supports filings against several trusts at once. How asbestos trust claims work.
• Lawsuits against solvent manufacturers. Many asbestos product makers are still in business and can be sued directly, including Union Carbide, the maker of the Visbestos mud additive, for making and selling a product they knew was dangerous. How product liability lawsuits work.
• Premises liability against the site owners. The drilling contractors, rig owners, and operators who controlled the worksites can be held responsible for the conditions they allowed, separate from the companies that made the products. How premises liability claims work.
• Federal and disability benefits. These depend on where and how the work was done, and they're paid in addition to the trust and lawsuit recovery. Work on a fixed platform on the Outer Continental Shelf can support Longshore (LHWCA) benefits; crews who worked aboard offshore drilling vessels may have Jones Act seaman claims; military service can support VA disability benefits; and Social Security disability is available to anyone whose illness stops them from working. How asbestos disability and benefit claims work.

When a drilling crew's case goes to court, the makers raise the same handful of defenses they raise in most asbestos cases, and none of them is new to us. The short version is that the arguments describe a cleaner, smaller version of the job than the one your loved one actually did, and the evidence answers them. The detail is below for anyone who wants it.

All of this applies only to the lawsuit side of a case. The trust claims are a paper process: no opposing lawyer raises defenses, no one is deposed, and no one goes to court.