mud pump drilling rig for sell in the us free sample

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Not usually. Most used drilling rigs for sale that have been posted are the result of a customer interaction where the customer indicated an interest in trading or outright selling a machine.

Typically not. Most used equipment is sold as-is, where-is. Geoprobe® strongly encourages any prospective buyers thoroughly evaluate any used equipment prior to purchase. In no way does posting a machine on this website guarantee a useful product is being offered by the sellers. Restated: Do not expect any warranty.

I’m interested in purchasing a machine being posted here but would like it to be serviced before taking delivery, can the service team at Geoprobe® complete the maintenance prior to my purchase and subsequent delivery?

Absolutely. The Geoprobe® Service Team is well known for providing exceptional repair services on used equipment. Repair estimates will be provided on a case-by-case basis.

Yes. Geoprobe® maintains multiple staff with years of Geoprobe® field experience. Training fees are quoted on a case-by-case basis, depending on numerous training details including location and days required.

Typically new submittals are grouped and posted one time per week. At the same time, equipment that has been sold during that time period will be removed from the listing.

The 2,200-hp mud pump for offshore applications is a single-acting reciprocating triplex mud pump designed for high fluid flow rates, even at low operating speeds, and with a long stroke design. These features reduce the number of load reversals in critical components and increase the life of fluid end parts.

The pump’s critical components are strategically placed to make maintenance and inspection far easier and safer. The two-piece, quick-release piston rod lets you remove the piston without disturbing the liner, minimizing downtime when you’re replacing fluid parts.

Mud pumps, or mud drilling rigs, are also used as water well drilling rigs, to address water concerns at the bottom of the mines. Mud pumps, also known as mud drilling rigs, are water well drilling rigs that are used to extract water from pits, and mud drilling rigs. The mud water drilling rig is also called as water well drilling rigs, and are also called as water well drilling rigs. The mud pumps, mud drilling rigs, are also called as water well drilling rigs, for example, droplets or mud pumps. They are designed to cut slurry from pits, mud pits, and mud drilling rigs. The most common mud pumps and mud drilling rigs are also called as water well drilling rigs, to mud pits.@@@@@

A water well drilling rig can consist of a large amount of mud, which is easily drained by due to the conditions of the water being high. There is also a band of mud trucks and drilling holes that are adequate for flowing water.@@@@@

A gasoline powered pump, also known as an off-road mud drilling rig, is a good choice for people that choose either a gasoline-powered pump or a water well driller rig. Gasoline-powered water well driller rig, for example, is a type of water well drilling rig that has two or more volt engines. On the other hand, a gasoline-powered water well driller rig is hard to distinguish from one of these two. Generally speaking, a gasoline-powered water well driller rig is one with the energy of a day, it is important to consider the type of water well drilling rig that is powered by a gasoline-powered pump, for instance, is a by-product of the two types of water well drilling rig. For instance, a gasoline-powered water well driller rig is by one that is high-pressure, and a two-stroke engine.@@@@@

Choosing the mud pumps depends on the size, the course of time, and the surface of the water. For instance, a one-stroke mud pumps depends on the size and the type of mud pumps. For instance, gasoline-powered is an electric version of the water well drilling rig.

1.1.1 The rig is suitable for survey and prospecting, geophysical exploration, roads and buildings and other exploration and play blasthole drilling bits projects.

1.1.4 Rated drilling depth 100m, the deepest can not exceed 120m. Nominal hole diameter of 110mm, the maximum opening straight Diameter allowed to be 130mm, the final hole diameter of 75mm, drilling depth according to ground conditions.

In geotechnical engineering, drilling fluid, also called drilling mud, is used to aid the drilling of boreholes into the earth. Often used while drilling oil and natural gas wells and on exploration drilling rigs, drilling fluids are also used for much simpler boreholes, such as water wells. One of the functions of drilling mud is to carry cuttings out of the hole.

The three main categories of drilling fluids are water-based muds (WBs), which can be dispersed and non-dispersed; non-aqueous muds, usually called oil-based muds (OBs); and gaseous drilling fluid, in which a wide range of gases can be used. Along with their formatives, these are used along with appropriate polymer and clay additives for drilling various oil and gas formations.

The main functions of drilling fluids include providing hydrostatic pressure to prevent formation fluids from entering into the well bore, keeping the drill bit cool and clean during drilling, carrying out drill cuttings, and suspending the drill cuttings while drilling is paused and when the drilling assembly is brought in and out of the hole. The drilling fluid used for a particular job is selected to avoid formation damage and to limit corrosion.

Many types of drilling fluids are used on a day-to-day basis. Some wells require different types to be used in different parts of the hole, or that some types be used in combination with others. The various types of fluid generally fall into broad categories:

Air/polymer: A specially formulated chemical, typically a type of polymer, is added to the water and air mixture to create specific conditions. A foaming agent is a good example of a polymer.

Water-based mud (WBM): Most water-based mud systems begin with water, then clays and other chemicals are added to create a homogeneous blend with viscosity between chocolate milk and a malt. The clay is usually a combination of native clays that are suspended in the fluid while drilling, or specific types of clay processed and sold as additives for the WBM system. The most common type is bentonite, called "gel" in the oilfield. The name likely refers to the fluid viscosity as very thin and free-flowing (like chocolate milk) while being pumped, but when pumping is stopped, the static fluid congeals to a "gel" that resists flow. When adequate pumping force is applied to "break the gel," flow resumes and the fluid returns to its free-flowing state. Many other chemicals (e.g. potassium formate) are added to a WBM system to achieve desired effects, including: viscosity control, shale stability, enhance drilling rate of penetration, and cooling and lubricating of equipment.

Oil-based mud (OBM): Oil-based mud has a petroleum based fluid such as diesel fuel. Oil-based muds are used for increased lubricity, enhanced shale inhibition, and greater cleaning abilities with less viscosity. Oil-based muds also withstand greater heat without breaking down. The use of oil-based muds has special considerations of cost, environmental concerns such as disposal of cuttings in an appropriate place, and the exploratory disadvantages of using oil-based mud, especially in wildcat wells. Using an oil-based mud interferes with the geochemical analysis of cuttings and cores and with the determination of API gravity because the base fluid cannot be distinguished from oil that is returned from the formation.

Synthetic-based fluid (SBM) (Otherwise known as Low Toxicity Oil Based Mud or LTOBM): Synthetic-based fluid is a mud in which the base fluid is a synthetic oil. This is most often used on offshore rigs because it has the properties of an oil-based mud, but the toxicity of the fluid fumes are much less. This is important when the drilling crew works with the fluid in an enclosed space such as an offshore drilling rig. Synthetic-based fluid poses the same environmental and analysis problems as oil-based fluid.

On a drilling rig, mud is pumped from the casing, where it emerges from the top. Cuttings are then filtered out with either a shale shaker or the newer shale conveyor technology, and the mud returns to the mud pits. The mud pits allow the drilled "fines" to settle and the mud to be treated by adding chemicals and other substances.

The returning mud may contain natural gases or other flammable materials which will collect in and around the shale shaker / conveyor area or in other work areas. Because of the risk of a fire or an explosion if they ignite, special monitoring sensors and explosion-proof certified equipment is commonly installed, and workers are trained in safety precautions. The mud is then pumped back down the hole and further re-circulated. After testing, the mud is treated periodically in the mud pits to ensure it has desired properties that optimize and improve drilling efficiency and borehole stability.

Drilling fluid carries the rock excavated by the drill bit up to the surface. Its ability to do so depends on cutting size, shape, and density, and speed of fluid traveling up the well (annular velocity). These considerations are analogous to the ability of a stream to carry sediment. Large sand grains in a slow-moving stream settle to the stream bed, while small sand grains in a fast-moving stream are carried along with the water. The mud viscosity is an important property, as cuttings will settle to the bottom of the well if the viscosity is too low.

Most drilling muds are thixotropic (viscosity increases when static). This characteristic keeps the cuttings suspended when the mud is not flowing during, for example, maintenance.

High density fluids may clean holes adequately even with lower annular velocities (by increasing the buoyancy force acting on cuttings) but may have a negative impact if mud weight exceeds that needed to balance the pressure of surrounding rock (formation pressure), so mud weight is not usually increased for hole cleaning.

Higher rotary drill-string speeds introduce a circular component to annular flow path. This helical flow around the drill-string causes drill cuttings near the wall, where poor hole cleaning conditions occur, to move into higher transport regions of the annulus. Increased rotation speed is the one of the best methods for increasing hole cleaning in high angle and horizontal wells.

Heavy material that settles is referred to as sag, which causes a wide variation in the density of well fluid. This more frequently occurs in high angle and hot wells.

For effective solids controls, drill solids must be removed from mud on the 1st circulation from the well. If re-circulated, cuttings break into smaller pieces and are more difficult to remove.

If formation pressure increases, mud density should be increased to balance pressure and keep the wellbore stable. The most common weighting material is barite. Unbalanced formation pressure will cause an unexpected influx (also known as a kick) of formation fluids into the wellbore possibly leading to a blowout from pressurized formation fluid.

Hydrostatic pressure = density of drilling fluid * true vertical depth * acceleration of gravity. If hydrostatic pressure is greater than or equal to formation pressure, formation fluid will not flow into the wellbore.

Hydrostatic pressure also controls the stress from tectonic forces, which can render wellbores unstable even when formation fluid pressure is balanced.

In practice, mud density should be limited to the minimum necessary for well control and wellbore stability. If too great it may fracture the formation.

Mud column pressure must exceed formation pressure, in this condition mud filtrate invades the formation, and a filter cake of mud is deposited on the wellbore wall.

Depending on the mud system in use, a number of additives can improve the filter cake (e.g. bentonite, natural & synthetic polymer, asphalt and gilsonite).

Chemical composition and mud properties must combine to provide a stable wellbore. Weight of the mud must be within the necessary range to balance the mechanical forces.

Wellbore instability = sloughing formations, which can cause tight hole conditions, bridges and fill on trips (same symptoms indicate hole cleaning problems).

If the hole is enlarged, it becomes weak and difficult to stabilize, resulting in problems such as low annular velocities, poor hole cleaning, solids loading and poor formation evaluation

In sand and sandstones formations, hole enlargement can be accomplished by mechanical actions (hydraulic forces & nozzles velocities). Formation damage is reduced by conservative hydraulics system. A good quality filter cake containing bentonite is known to limit bore hole enlargement.

In shales, mud weight is usually sufficient to balance formation stress, as these wells are usually stable. With water base mud, chemical differences can cause interactions between mud & shale that lead to softening of the native rock. Highly fractured, dry, brittle shales can be extremely unstable (leading to mechanical problems).

Various chemical inhibitors can control mud / shale interactions (calcium, potassium, salt, polymers, asphalt, glycols and oil – best for water sensitive formations)

To add inhibition, emulsified brine phase (calcium chloride) drilling fluids are used to reduce water activity and creates osmotic forces to prevent adsorption of water by Shales.

Lubrication based on the coefficient of friction.("Coefficient of friction" is how much friction on side of wellbore and collar size or drill pipe size to pull stuck pipe) Oil- and synthetic-based mud generally lubricate better than water-based mud (but the latter can be improved by the addition of lubricants).

Poor lubrication causes high torque and drag, heat checking of the drill string, but these problems are also caused by key seating, poor hole cleaning and incorrect bottom hole assemblies design.

Drilling fluids also support portion of drill-string or casing through buoyancy. Suspend in drilling fluid, buoyed by force equal to weight (or density) of mud, so reducing hook load at derrick.

Hydraulic energy provides power to mud motor for bit rotation and for MWD (measurement while drilling) and LWD (logging while drilling) tools. Hydraulic programs base on bit nozzles sizing for available mud pump horsepower to optimize jet impact at bottom well.

Mud loggers examine cuttings for mineral composition, visual sign of hydrocarbons and recorded mud logs of lithology, ROP, gas detection or geological parameters.

Mud should have thin, slick filter cake, with minimal solids in filter cake, wellbore with minimal cuttings, caving or bridges will prevent a good casing run to bottom. Circulate well bore until clean.

Mud low viscosity, mud parameters should be tolerant of formations being drilled, and drilling fluid composition, turbulent flow - low viscosity high pump rate, laminar flow - high viscosity, high pump rate.

Water based drilling fluid has very little toxicity, made from water, bentonite and barite, all clay from mining operations, usually found in Wyoming and in Lunde, Telemark.

There are specific chemicals that can be used in water based drilling fluids that alone can be corrosive and toxic, such as hydrochloric acid. However,

Caustic (sodium hydroxide), anhydrous lime, soda ash, bentonite, barite and polymers are the most common chemicals used in water based drilling fluids.

Water-based drilling mud most commonly consists of bentonite clay (gel) with additives such as barium sulfate (barite), calcium carbonate (chalk) or hematite. Various thickeners are used to influence the viscosity of the fluid, e.g. xanthan gum, guar gum, glycol, carboxymethylcellulose, polyanionic cellulose (PAC), or starch. In turn, deflocculants are used to reduce viscosity of clay-based muds; anionic polyelectrolytes (e.g. acrylates, polyphosphates, lignosulfonates (Lig) or tannic acid derivates such as Quebracho) are frequently used. Red mud was the name for a Quebracho-based mixture, named after the color of the red tannic acid salts; it was commonly used in the 1940s to 1950s, then was made obsolete when lignosulfonates became available. Other components are added to provide various specific functional characteristics as listed above. Some other common additives include lubricants, shale inhibitors, fluid loss additives (to control loss of drilling fluids into permeable formations). A weighting agent such as barite is added to increase the overall density of the drilling fluid so that sufficient bottom hole pressure can be maintained thereby preventing an unwanted (and often dangerous) influx of formation fluids

Freshwater mud: Low pH mud (7.0–9.5) that includes spud, bentonite, natural, phosphate treated muds, organic mud and organic colloid treated mud. high pH mud example alkaline tannate treated muds are above 9.5 in pH.

Water based drilling mud that represses hydration and dispersion of clay – There are 4 types: high pH lime muds, low pH gypsum, seawater and saturated salt water muds.

Low solids mud: These muds contain less than 3–6% solids by volume and weight less than 9.5 lbs/gal. Most muds of this type are water-based with varying quantities of bentonite and a polymer.

Oil based mud: Oil based muds contain oil as the continuous phase and water as a contaminant, and not an element in the design of the mud. They typically contain less than 5% (by volume) water. Oil-based muds are usually a mixture of diesel fuel and asphalt, however can be based on produced crude oil and mud

"Mud engineer" is the name given to an oil field service company individual who is charged with maintaining a drilling fluid or completion fluid system on an oil and/or gas drilling rig.mud engineer, or more properly drilling fluids engineer, is critical to the entire drilling operation because even small problems with mud can stop the whole operations on rig. The internationally accepted shift pattern at off-shore drilling operations is personnel (including mud engineers) work on a 28-day shift pattern, where they work for 28 continuous days and rest the following 28 days. In Europe this is more commonly a 21-day shift pattern.

In offshore drilling, with new technology and high total day costs, wells are being drilled extremely fast. Having two mud engineers makes economic sense to prevent down time due to drilling fluid difficulties. Two mud engineers also reduce insurance costs to oil companies for environmental damage that oil companies are responsible for during drilling and production. A senior mud engineer typically works in the day, and a junior mud engineer at night.

The cost of the drilling fluid is typically about 10% (may vary greatly) of the total cost of drilling a well, and demands competent mud engineers. Large cost savings result when the mud engineer and fluid performs adequately.

The compliance engineer is the most common name for a relatively new position in the oil field, emerging around 2002 due to new environmental regulations on synthetic mud in the United States. Previously, synthetic mud was regulated the same as water-based mud and could be disposed of in offshore waters due to low toxicity to marine organisms. New regulations restrict the amount of synthetic oil that can be discharged. These new regulations created a significant burden in the form of tests needed to determine the "ROC" or retention on cuttings, sampling to determine the percentage of crude oil in the drilling mud, and extensive documentation. No type of oil/synthetic based mud (or drilled cuttings contaminated with OBM/SBM) may be dumped in the North Sea. Contaminated mud must either be shipped back to shore in skips or processed on the rigs.

A new monthly toxicity test is also now performed to determine sediment toxicity, using the amphipod L. plumulosus to determine its effect on the animals.

Clark, Peter E. (1995-01-01). "Drilling Mud Rheology and the API Recommended Measurements". SPE Production Operations Symposium. Society of Petroleum Engineers. doi:10.2118/29543-MS. ISBN 9781555634483.

The report covers comprehensive information about market trends, volume (Units) and value (US$ Mn) projections, competition and recent developments and market dynamics in the global mud pumps market for the study period of 2013 to 2026.

The global mud pumps market is expected to reach a little over US$ 1,085 Mn over the forecast period, registering a CAGR of 4.4%. Growth in drilling activities in the oil & gas Industry to increase hydrocarbon production and ease of the mud circulation operation in drilling holes are some of the factors expected to lay a robust foundation for the growth of the global mud pumps market.

Mud pumps can be classified on the basis of the number of pistons into duplex, triplex and quintuplex, which consist of two, three and five pistons respectively. The triplex segment is expected to dominate the mud pumps market in terms of value as well as volume during the entire forecast period.

Triplex mud pumps find extensive usage in circulating drilling fluid with high pressure for deep oil well drilling application. These usage characteristics make them preferable for use, primarily in onshore and offshore oil well drilling applications.

By the end of 2026, the triplex segment is projected to grow 1.42X its size in 2018 by value, creating an absolute dollar opportunity of nearly US$ 234 Mn during the forecast period.

Mud pumps are widely utilized in the oil & gas industry. On the basis of the mode of operation, mud pumps can be classified as electric and fuel engine mud pumps.

Fuel engine mud pumps use petroleum oils as the key liquefying agent. These types of mud pumps release hazardous gases into the environment. In order to contain the hazardous impact of fuel engine mud pumps on the environment, regulatory authorities are compelling manufacturers and consumers to opt for electric mud pumps, which do not emit volatile organic compounds and operate with low noise and low vibration. Electric mud pumps offer smooth operations in drilling rigs and are environment-friendly, which is why they dominate the market for mud pumps.

The electric mud pumps segment is projected to grow with a 4.5% CAGR during the forecast period in view of the tightening emission control regulations and is expected to create an absolute $ opportunity worth US$ 134 Mn between 2018 and 2026.

Among all the applications analyzed in this global mud pumps market study, the onshore application of mud pumps is expected to register about 1.43X growth in terms of value between 2018 and 2026. The offshore application of mud pumps is projected to register moderate growth during the entire forecast period, led by land oil field discoveries.

In terms of incremental $ opportunity, onshore and offshore segments are expected to compete within large margins. The onshore application of mud pumps is expected to occupy over an 86% share in terms of value by the end of 2026.

Increasing oil-well exploration activities, stable economic conditions and consistent growth in oil well drilling rig sales in the region are expected to drive the demand for mud pumps in the region.

The comparatively well-established production sector in the region and increasing oil and gas industry and hydrocarbon consumption will create a healthy platform for the growth of the mud pumps market. Some regions including China and Europe are expected to gain traction in the latter half of the forecast period, owing to the anticipated growth of the oil & gas industry in these regions. North America is expected to register above-average 1.1X growth in the market. All the other regions are anticipated to exhibit moderate growth during the same period.

Apart from Europe and China, all other regions are anticipated to lose market value share over the forecast period. China and Europe are collectively expected to register a CAGR of 4.3% by value.

The global mud pumps market is consolidated with limited market players holding considerable double-digit market shares as of 2017. Globally, the top 12 players in the mud pumps market collectively hold between 53% and 58% of the market share.

Over the past few years, the mud pumps market has witnessed significant technological advancement from the competition perspective. Acquisitions, collaborations and new product launches are some of the key strategies adopted by prominent players to expand and sustain in the global mud pumps market.

In 2018, National Oil Varco signed a deal with Dubai Saudi Armaco to form a joint venture for the manufacturing of onshore rigs and equipment in Saudi Arabia

In 2015, Flowserve opened a new pump manufacturing plant in Coimbatore, India. Through this new facility, the company aims to provide pump products for the oil and gas industry in Asia Pacific

Some of the key players involved in this market study on the global mud pumps market include National Oil Varco Inc., Schlumberger Limited, Gardner Denver Inc., Weatherford International Plc., China National Petroleum Corporation, Trevi-Finanziaria Industriale S.p.A., MhWirth, BenTech GmbH Drilling Oilfield systems, American Block Inc., Honghua Group Limited, White Star Pump Company LLC, Flowserve corporation, Ohara Corporation, Mud King Products, Inc. and Herrenknecht Vertical GmbH.

Browse through our substantial offering of geotechnical & environmental drill rigs for sale, and find exactly what you need to successfully complete your drilling jobs. Rig Source offers both new and used auger drilling rigs as well as environmental direct push units. We proudly offer, Diedrich, CME, Mobile, Acker and Geoprobe®.

At Rig Source, all of our geotechnical & environmental drill rigs have been selected based on their reputation of excellence. If you’re opting to purchase geotechnical & environmental drill rigs used, they are available “as is,” or can be restored by our service department to make them, “like new.” Regardless, our expertise in the geotechnical & environmental drill rig industry will allow you to rest assured that we will get you into the auger drill rigs or direct push units appropriate for you.

Due to the high demand for auger drill rigs and direct push units, our inventory is constantly changing. It is highly recommended that if you don’t see the geotechnical & environmental drill rigs you are looking for below, that you give us a call to speak with our highly knowledgeable sales team that is up to date with our inventory.

A well-placed suction stabilizer can also prevent pump chatter. Pump chatter occurs when energy is exchanged between the quick opening and closing of the reciprocating pump’s valves and the hammer effect from the centrifugal pump. Pump isolation with suction stabilizers is achieved when the charge pumps are isolated from reciprocating pumps and vice versa. The results are a smooth flow of pumped media devoid of agitating energies present in the pumped fluid.

Suction stabilizer units can mitigate most of the challenges related to pulsations or pressure surges, even in the most complex piping conditions. The resulting benefits prevent expensive unplanned downtime and decrease costs and inconvenience associated with system replacements and repairs.

The land drilling market worldwide is structured primarily as a rental market, not a sales market, where land drilling companies lease their rigs to E&P companies for an agreed period of time – weeks, months, or years – at a day-rate. The rigs are then used to drill wells and execute the E&P’s drilling programs.

Drilling opportunities are analysed and explored in order, leaving a series of dry holes, until a discovery is made. It is rare for an E&P company to actually own the rigs which they operate, but there are some exceptions such as Chesapeake, who will purchase their own fleet of rigs.

Under these rental contracts, a turnkey cost is paid by an E&P business to a middleman. This includes an insurance premium, which is returned if nothing goes wrong, but may be lost if there are difficulties. Higher specification equipment commands a larger premium.

Investors require a minimum level of return for their investment dollars in drilling operations, and typically equate cost with risk. These turnkey drilling contracts may limit risk by guaranteeing a minimum number of wells that can be drilled with the rig. The contract will also outline how the rig can be used – including the pieces of equipment, when to change pieces, temperature and pressure tolerances and the weight of mud.

The International Association of Drilling Contractors (IADC) lists 547 members in the category of Land Drilling Contractors. According to Statista, the key US land drilling contractors are: Nabors Industries Ltd, Helmerich & Payne Inc, Patterson-UTI Energy Inc, Precision Drilling Corporation and Pioneer Energy Services Corp.

Nabors operates the world’s largest land drilling rig fleet, with around 500 rigs operating in over 25 countries – in almost every significant O&G basin on the planet. It also has the largest number of high-specification rigs (including new AC rigs and refurbished SCR rigs) and custom rigs, built to withstand challenging conditions such as extreme cold, desert and many complex shale plays.

Headquartered in Tulsa, Oklahoma, H&P is a global business with land operations across the US, as well as offshore operations in the Gulf of Mexico. It is engaged primarily in the drilling of O&G wells for E&P companies, and recognised for its innovative FlexRig technology.

Patterson-UTI operates land based drilling rigs, primarily in O&G producing regions of the continental US, and western Canada. The company also provides pressure pumping services to US E&P companies and specialist technology, notably pipe handling components, to drilling contractors globally.

Precision is an oilfield services company and Canada’s largest drilling rig contractor, with over 240 rigs in operation worldwide. The Company has two segments. The Contract Drilling Services segment operates its rigs in Canada, the United States and internationally. The Completion and Production Services segment provides completion and workover services and ancillary services to O&G E&P companies in Canada and the US.

Pioneer operates a modern fleet of more than 24 top performing drilling rigs throughout onshore O&G producing regions of the US and Colombia. The company also offers production services include well servicing, wireline, and coiled tubing services – supported by 100 well-servicing rigs, and more than 100 cased-hole, open-hole and offshore wireline units.

Together these five companies dominate the US rental market. Other smaller but prominent contractors include: Parker Drilling, Unit Corp, Independence Contract Drilling, Seventy Seven Energy, Schramm and Ensign Drilling. Beyond these players, the market is highly fractured, with many “mom & pop” style drillers.

In Texas, generally considered to be the centre of US land drilling, RigData reports that there are currently 678 active rigs – split between Helmerich & Payne (160), Patterson-UTI (85), Nabors (64), Precision Drilling (39) and 77 other drillers (330).

Most new onshore rigs, both drilling and work over rigs, are built by OEMs in China. In the US, the larger vertically integrated land drillers have in-house manufacturing operations, so they will outsource some equipment construction, but assemble the new rigs at their own facilities. The leading provider of US newbuild rigs is National Oilwell Varco.

The secondary market, where existing rigs are sold, is largely auction dominated with mostly older rigs changing hands. As a rule, the big land drillers do not sell their newbuild rigs, as each has their own flagship designs.