CBM drilling

Shale shaker is the act as the first stage solids control equipment. Its performance important to the whole system. If the shale shaker can work well, it can greatly improve the lifetime of next stage equipment.

Shale shaker vibration

Vibration of the shaker basket creates G-forces which help drive shear thinning fluids such as drilling mud through the screens. Vibration also conveys solids off the screens. Most linear motion shakers operate in the range of 3 to 4 G’s to balance throughput with screen life. G-force is a function of vibration frequency (rpm) and stroke length.

Top brand Linear motion shale shaker

Top brand Linear motion shale shaker

But there are alway some misunderstanding on shale shaker performance, it should be avoided :

• “High-Speed” should not be equated with “high performance”.

Laboratory tests indicate that, in the normal operating range for linear motion shale shakers, lower frequency vibration and longer stroke lengths improve throughput capacity. Most linear motion shakers operate at 1200 to 1800 rpm.

• Avoid deck inclinations above 3˚.

High deck angles reduce solids conveyance and increase the risk of grinding soft or friable solids through the screens.

• Shakers are designed to accept either hookstrip or rigid frame screen panels.

Hookstrip screen panels are the most common and are usually cheaper, although cuttings wetness can be a concern due to deck curvature. Flat, rigid frame panels promote even fluid coverage, but can cost more.

• Shakers may have single or tandem screening decks. Single deck shakers offer mechanical simplicity and full access to the screening surface. Single deck shakers may be arranged to process mud sequentially as a “cascading” system to improve performance under high solids loading conditions. Tandem deck shakers offer improved processing capacity under high solids loading conditions when space is limited.

 

 

About microtunneling

Microtunnelling is a nature method of construction using pipe jacking. In many countries and areas, it also defined as a “Trenchless Construction Method”.

Slurry separation system for microtunneling

Microtunnelling project usually takes in urban district. In this case mud system matched for microtunneling request compact and a very small footprint recirculation slurry system with different capacity. This kind of mud system usually called as “slurry separation system”.

TBM Slurry Separation System In Oman

Features of slurry separation system

1) Steel Frame Screen with large open microns usually used.

As the solids usually bigger than oil and gas drilling, solids content higher and many bigger size sands / solids. And it is big diameter well with smaller depth, no higher request for mud quality. It is no need to separate very fine. And steel frame have a longer lifetime for microtunneling.

2) Compact system with smaller footprint: all separation equipment combined together, a storage tank and a mixing tank.

Usually, GN only offer separation plant and equipment for mixing part. And recommend users to build storage / mixing tank locally to save cost.

3) Big size hydro cyclones for large capacity. And it is not easy to be blocked.

GN Solids Control have exported 9 mud system to Australia from last year, for coal bed methane drilling and HDD (horizontal directional drilling).  The feedback is very exciting. More and more Australian companies are going to buy from us. And we are going to attend the No-dig exhibition in October, 2011.

Coal Bed Methane Drilling Exploration in AustraliaCBM drilling mud system

Although the presence of methane has been known ever since coal mining began, separate commercial production of CBM is a relatively recent step. This commenced in the USA in the 1970’s, and exploration for CBM in Australia began in 1976 in Queensland’s Bowen Basin when Houston Oil and Minerals of Australia Incorporated drilled two unsuccessful wells. In February 1996 the first commercial CMM operation commenced at the Moura mine in Queensland methane drainage project (then owned by BHP Mitsui Coal Pty Ltd). In the same year at the Appin and Tower underground mines (then owned by BHP Pty Ltd) a CMM operation was used to fuel on-site generator sets (gas fired power stations). The first stand alone commercial production of CBM in Australia commenced in December 1996 at the Dawson Valley project (then owned by Conoco), adjoining the Moura coal mine.

Coal Bed Methane Drilling Mud System

Very similar to systems for HDD, but higher required about the electricity. Now we are learning very well about this part, that is why we are competitive, our manager usually says. Very Thankful for the clients which are patient, and help us to know all these very well.

Here is a list of some exciting news, if you want to know more, kindly contact us.

2 Sets 500GPM Mud Recycling System with Hydraulic Jack up to Australia Brisbane

GN500 GPM Drilling fluid system for coal seam Methane and HDD

GN 500GPM Mud Recycling System to Australia