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Monthly Archives: March 2014

High quality mud gas separator from DC Machinery

Mud/Gas Separators are ideal for use where drilling is likely to encounter large volumes of gas. The technology is especially beneficial in sour gas environments or when drilling with an underbalanced mud column. Mud gas separator is extremely reliable and vital safety equipment for nowadays drilling operations. It is used to separate and safely vent large pockets of free gas that may include toxic gases such as hydrogen sulfide, etc. from the drilling fluids processing system.

Mud gas separator_


High process efficiency during continued drilling.
Promotes safe drilling environment.
Efficient removal of free gas.
Built to match drilling program and application.
Control delivery of gas to the flare line.
Control of retention time of gas-cut mud in the vessel.
Optimizes process effectiveness and efficiency.
Easy transportation, rig-up and rig-down.
Adaptable for different drilling height or other conditions.

The working principle of the poor boy degasser is simple. The drilling mud with gas mixture in the bore hole is transferred by mud return lines to the inlet of the mud gas separator, allowing it to impinge on a series of baffles which separates gas from drilling mud. The free gas flows into the flare line to be burned and the mud discharges to the shale shaker and to the mud tank.

DC International Engineering mud gas separators are supplied with top quality temperature and pressure sensing equipment where requested. These instruments can provide local displays at the separator, a display at the choke and kill control system and give repeated signals for the drilling control system. DC can also provide loop seal pressure monitors and alarms. All this can be achieved through an DC hazardous area certified, control system.

Brandt COBRA™ Shale Shaker VS Dachuan DCS700-3 Shaker




Dachuan DCS700-3 Shaker


 (L x W x H)

94⅝ in x 66⅛ in x 61 in

107 in x 63 in x 65 in

2403.6 mmx1679.7 mmx1549.4 mm

2730 mmx1600 mmx1640 mm

Screen Quantity



Deck Angle

0°, +5°, +5°

Adjustable -1° to +5°

Motor Type


Long Vibra-Motors

Motor Power (1 each)

1.75hp (1.3kw)@ 380V/50Hz

2.04hp (1.5kw)@ 380V/50Hz

Screen Type

Pretension, repairable

Pretension, repairable

Screen Dimensions

 (L x W x H)

49.25 in x 25 in x 1 in

41.34 in x 27.56 in x 1 in

(1251 mm x 635 mm x 25.4 mm)

(1050 mm x 700 mm x 25.4 mm)

Screen Area

25.4 ft² (2.4m²)

23.7 ft² (2.2m²)


5.4 Nominal G’s

7.0 Nominal G

Vibration Motion



Features and Benefits of Dachuan Linear Motion Shale ShakerDachuan DCS700-3 Shaker



Unique, rugged basket design

Provides optimal mud coverage of screen surface

Few replacement parts

Small parts inventory provides costs savings

Linear Motion

Solids are separated and discharged with minimum attrition

Adjustable deck angles -1° to +5°

Keeps the mud pool volume small, which helps to increase screen life

Utilizes three (3) repairable, pretension screens

25.4 ft² (2.2 m²) of screen area which is repairable, thus offering cost savings

Individual seals on every screen

Screen seals eliminate screen leakage

Pin-and-hole screen securing system

Screens fit snugly and will not slip or slide once secured

DC Solid control Mud agitator sales

Mud Agitator is used in surface mud systems to suspend solids and maintain homogeneous mixture throughout the system. A mechanical agitator is driven by an explosion-proof motor, coupled to a gear box that drives the impeller shaft. The impellers (turbines) transform mechanical power into fluid circulation or agitation. The objective is to obtain a uniform suspension of all solids.

Mud agitator

Principle of mud agitators

Agitators play an important role in the surface treatment of drilling fluid. Impeller type mixers provide both axial and radial flow, which lowers mud costs and improves mud properties. Impeller-type mixers are basically low-shear and low energy, inexpensive to operate and easy to maintain. Low- shear mixers are used to suspend and mix mud additives minimizing particles size degradation and polymer shear.

Mud agitators serve three purposes:

1.Ensure mud additives are homogeneously mixed, preventing spot over treatment of chemicals, dilution water or weighting agents.
2.Prevents the pits from” gelling” by keeping the active mud system moving when the mud pumps are disengaged.
3.When drilling with weighted mud, properly sized agitators will keep the weighting agents in suspension, minimizing solids from settling in corners or dead spots of the pit.

Mud agitator impeller

Mud Agitator Features & Benefits

1. Helical-bevel gearbox
2. Explosion-proof electric motor
3. Able to process 20 ppg drilling fluid
4. Power available ranging from 2.2 to 22KW
5. Compact, quiet, smooth and easy to maintain.

If you have requirements of the mud agitator, please fell free to contact us, believe we will provide you the matural service and best price.

Why increasing coal seam gas supply will result in higher gas prices

coal seam gas

A coal seam gas processing plant in the Surat basin, Queensland.

Australia is increasing its supply of liquefied natural gas – mostly through coal seam gas production. Usually, increasing supply should mean lower prices but for those living in the eastern and southern states the impact will certainly be higher gas prices.

While this seems illogical the reason is because, as the Australia Institute noted in its report, Fracking the Future, the reduction in price would occur only if “all others things are equal”. And very soon all other things in the LNG industry are not going to be equal.

At present, the eastern gas market services domestic consumption only. And there is plenty of supply to meet the demand for both commercial and household use.

But this year this market – which includes Queensland, New South Wales, the Australian Capital Territory, Victoria, Tasmania and South Australia – will become linked to the rest of the world when exports of LNG from Queensland will start.

Once a market becomes connected to an international market, the domestic price will move to the international price because that is the bigger market. Among Asia/Pacific nations (to whom we export) Australia’s consumption of natural gas accounts for only about 4%:

So the market will be completely swamped by the demand from overseas. The Australian energy market operator predicts demand for LPG from overseas will be more than twice the domestic demand by 2017: And the problem for those living in the eastern states is that the overseas gas price is much higher than the domestic price.

There is no actual “world price” of LNG. The easiest way is to break the prices up into three areas: Europe, Japan and the US:

The boom in prices in the Japan/Asian market since 2003 (ignoring the drop due to the global financial crisis) is the reason for the boom in gas mining in Queensland.

The import price of LNG in Japan is now just above US$16 a gigajoule. By contrast prices in the eastern states of Australia are between US$2-$4 a gigajoule.

There are those who suggest that we can be just like the US, where the price for LNG has dropped drastically since 2008 (when it was roughly the same as Japan and Europe) due to the massive increase in production of shale gas. Thus they argue all we need to do is increase our production of CSG and prices here will also fall.

Alas such misty-eyed views of the gas industry rather fail to acknowledge that the US’s domestic demand for LNG is the biggest in the world. It accounts for nearly 22% of all LNG consumption in the world; Australia accounts for just 0.8%.

Similarly the US produces about 21% of all LPG in the world. Australia by contrast produces about 1.5%: Also very little of the US’s gas is exported – due to significant export restrictions. Thus the US experience would work here in Australia only if, like in the US, our massive increase in CSG was to service just the domestic market.

The Grattan institute last year also looked at the issue of gas and noted that domestic gas prices should not increase all the way up to the Japan price. The Japan price includes the cost of shipping it from here to there – about $5 to $6 a gigajoule. So the “export parity” price would be presently about $11 a gigajoule – still well over double the present price in the eastern network.

The Grattan institute suggested this would see household gas prices in Victoria (the state with the highest household consumption) to rise by about 20% – or about $170 a year for the average household. But given this year NSW gas retailers are already pushing for a 20% increase in gas prices, I’d suggest the $170-a-year increase is on the low side.

The big problem for NSW is it will have a supply problem in a few years – not because of increased domestic demand outstripping supply but because, as the Bureau of Resources and Energy Economics notes, “a large number of wholesale gas supply contracts are set to expire between 2014 and 2018. By 2018, less than 15% of New South Wales’ demand will be met by existing contracts.”

The problem being that suppliers from now on can sell overseas rather than sign another contract at the lower prices being offered in NSW.

So what to do?

Sure we could increase supply through CSG, but it will have no significant impact on prices here, though it may ensure domestic supply – but only if the extra production is not exported. And even then the impact on prices may only be to keep them equal or marginally below the export price.

In WA the government has a policy that reserves supplies of gas for domestic use. This policy has not however kept prices down to eastern network levels, but they remain below the export parity price.

Such a policy in effect subsidises households and gas-consuming businesses. This has the negative impact of allowing inefficient business (and industries) to continue to operate. But keeping the price artificially low also has the impact of reducing the incentive to switch to more expensive renewable energy.

But without a carbon price (and possible changes to the renewable energy target), if the gas price increases, coal-fired electricity will be more economic and our emissions will almost certainly rise.

The Grattan institute recommends against governments reserving supply for domestic use. Rather it recommends allowing the price we pay for gas to be set on the international market much like is the case for petrol.

It acknowledges this will increase costs to consumers and businesses. To compensate it argues that commonwealth and state governments “should ensure that there is an efficient tax regime in place for the gas industry, and that the gains are distributed appropriately”.

A tax on mining to redistribute profits? Anyone care to bet on the likelihood of that occurring?

Petrobras Confirms Deepwater Oil Discovery in Potigur Basin off Brazil

Petroleo Brasileiro S.A. reported Wednesday that it has completed drilling wildcat well 1-BRSA-1205-RNS (1-RNS-158), located in deep-waters of the Potiguar Basin off  Brazil. The results confirm the discovery of intermediate oil (24 degree API), as previously announced to the market Dec. 17, 2013.

The well, informally referred to as Pitu, is located at a water depth of 5,679 feet (1,731 meters), 34 miles (55 kilometers) off the coast of the state of Rio Grande do Norte.

The well reached the total depth of 17,562 feet (5,353 meters) and detected a hydrocarbon column of 616 feet (188 meters). A formation test was carried out, which confirmed the reservoir’s satisfactory permeability and porosity.

Based on the results obtained, the consortium will proceed with the exploratory activities, with the aim of proposing a Discovery Evaluation Plan to Brazil’s National Petroleum, Natural Gas and Biofuels Agency.

Petrobras is the operator of concession BM-POT-17, with an 80 percent interest, in partnership with Petrogal Brasil S.A., which holds 20 percent.

As a result of the on-going farm-out process and after obtaining the necessary approval from Brazilian authorities, BP Energy do Brasil Ltda will join as a concessionaire and the interests of the consortium members in BM-POT-17 will be as follows: Petrobras – 40 percent (operator), BP Energy do Brasil Ltda – 40 percent and Petrogal Brasil S.A – 20 percent.

How to Solve the Low Discharging of Linear Motion Shale Shakers

linear motion shale shakerDuring the daily treating operation of shale shakers, there may occur the situation of low discharging, now let me introduce how Dachuan suggest to solve this problem.

Firstly, check if the shaker screen and the discharge port are horizontal or overhigh, it should be 5 mm higher under normal circumstance, heights of the discharge ports are not the same depending on different materials.

Secondly, when operating, check if the screen surface or discharge port is horizontal, which directly related to the screening effect of the device; if it is not horizontal, it is necessary to timely adjust over. Linear motion shale shakers produced by Dachuan Machinery all have supporting feet, customers can make the shaker to be horizontal by adjusting the feet.

Finally, in addition to the above situations, the key point is the angle of eccentric blocks of vibration motor can be adjusted. Small angle is to make the material spread outward more quickly, and large angle can make the material spread outward slowly. Adjustment of the angle of vibration motor eccentric blocks should be arround 5 degrees, if you have strict requirement on the accuracy of screening, the motor angle should not be too small, otherwise the material will spread outward soon, which is bad for the screening effect, the default angle of linear motion shale shaker vibrating motor is 45 ° before they leave the factory.

Impact of Gas-cutting Drilling Fluid to Shale Shakers

shale shaker

Shale shaker screening is dependent on a constant flow of drilling fluid with cuttings. The fluid must pass through the screen, and the cuttings must either pass through or be rejected by the screen. Gas cutting in the drilling mud can have up to three different effects that upset the screening process.

  1. Gas heading can cause volume surges in the mud flow that exceed the ability of the screen to handle fluid flow. This is usually from gas, intermixed in the mud, rapidly expanding at the surface and pushing large surges of drilling fluid out the flowline.Vacuum degassers and mud gas separators are the solutions to this problem.
  2. Gas cutting from tiny gas bubbles entrained in the drilling fluid can cause screen blinding when the bubbles expand to fill the area between the screen wires. This problem is usually handled by a degasser that removes the entrained gas from the drilling fluid.
  3. Foaming associated with gas cutting leaves a film of very light, wet foam on the shaker screen. The foam is too light to be gravity-pulled through the screen and carries extra liquid off the end of the shaker. Often the fluid loss is not significant and can be ignored. In other cases shaker sprays and defoamers are needed to break the foam. However, shaker sprays tend to wash extra cuttings through the screen.
  4. A fourth problem, not related to gas, is an extreme rise in the viscosity of the drilling fluid from saltwater or salt. This may cause the drilling fluid to flow over and not pass through the shaker screen. This problem often requires the bypassing of the contaminated mud to a reserve tank.
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