Riser TechINNOVATIVE|RELIABLE|ECONOMIC

A PRODUCT BY :

JUSTIN JOSEKON AGUEK DENGRESHU AGARWALVIJAY AMARNATH

INTRODUCTION

More than 50 different riser concepts are under development today for use in deep and ultra-deep water regions.

Currently, the cost of a drilling riser amounts to tens of millions of dollars and

additional costs also add up during the non-productive trip-time.

Every minute counts in the total bill of the rig.

This model is essentially designed to save the non-productive time (tripping time proportional to water depth) in drilling operations.

ECONOMIC IMPORTANCE

On an average, there are 850 operational offshore rigs.

The rent for an offshore rig amounts to $300,000/day.

$255 million/day is spent by oil companies on offshore rigs.

Our design :• Reduces the non-productive time by 5%• Considerably reduces the manpower and capital

expenditure.

“We can save about $12.75 million per day.”

USPWHAT MAKES OUR DESIGN UNIQUE?

“OUR DESIGN”Cross-sectional shape : Changed from circle to elliptical shape. To make more room for drilling string to hold the casing pipes along with the drill bit saving tripping time during

operations.

Helical shape : The water currents in deep and ultra deep water are very high acting as a drag force on the riser increasing the

displacement of the riser from the wellbore.

Increase in diameter : Leaving enough margin for variable riser wall thickness which is necessary for deep and ultra deep waters due to change

in pressures from the surface to the seabed.

Thickness increased: For each riser string it is computed from shut in pressure, drilling and completion mud weights (hoop and axial stresses in

deep water also governs the thickness )

More buoyancy materials: The riser and the drilling string which contain the drilling fluids make a significant weight which has to be supported by it

own weight and not by the drilling vessel buoyancy materials are used to maintain the riser weight .

DESIGN CROSS SECTION

PRACTICAL IMPLICATIONS

Our design is able to :

Hold a drill pipe and a casing string at the same time which considerably reduces the non-productive trip time during casing operations.

Combat the high underwater pressures and water currents more efficiently than conventional risers.

To significantly remove the problem of displacement of the riser with the new helical design.

Stabilize the riser with the inbuilt hydraulic tension system thereby making for a safer design.

WHY SHOULD THE O&G INDUSTRY USE OUR DESIGN?

Safety First.

Displacement of drilling riser leads to innumerable problems on the drilling vessel because of which keeping the risers stable in all kinds of environments is of high priority.

Lesser recoil as the riser is heavy.

Time is Money.

Reducing the non-productive and trip time of the drilling string from the sea floor to the drilling vessel is presented to save millions of dollars.

Operating in Harsh Environments.

This design has been optimally planned to combat the harsh and hostile underwater environments. For e.g. High subsea pressure and high velocity water current etc.

OPERATIONAL MECHANISM

The riser is installed with the BOP after the conductor casing has been installed During drilling operations the drill string is lowered from the platform to the sea flower and drilling is

performed. During this time the void area of the riser is filled with the drilling mud. The rotatory motion of the drill bit is provided by rotary table or the top drive through the drilling

string which passing through the riser. Casing starts with removing the drill pipe. The pipe is removed only up to the seabed level i.e. when the bit comes on the level of the seabed it is

laterally shifted to the side-wards and put off in the void area of risers. Drill bit is placed in the depression provided in the bottom-most riser to stop its vibrations due to

harsh environment conditions. On the platform the drill string is hanged off with the help of roughneck leaving enough area in the

riser to perform casing and cementing operations.

MARKETING STRATEGY

WHY OUR BRAND?

INNOVATION DESIGNHELICAL

ELLIPTICAL

RELIABILITY STABLE DEEP WATER

ECONOMIC TRIP TIMESAVE

MILLIONS

THE OUTREACHWHERE WILL THIS DESIGN WORK?

Our design applies not only to newly discovered unconventional deep water oil reservoirs but also to the present-day reserves under exploitation.

It is carefully designed to face underwater pressures, stresses and water currents for the optimal production of crude from these reserves.

COMPETITION

More than 1,550 production risers and 150 drilling risers in use today on floating units

85% of the production risers are flexibles. More than 90% of the drilling risers are "low pressure" with flange/dog type

couplings. Flexibles are in use today in water depths up to 4500 ft, and top tensioned risers

(TTR) and steel catenary risers (SCR) are being used in depths up to 4,800 ft.

“Our riser works to a depth of 10000 ft.”

RISER MARKET - THE FUTURE

As field developments progress into increasingly greater water depths, the ability of the riser systems to drill, produce, and export fluids between the seabed and floating platforms will provide the principal challenge to the industry.

The riser contractors are actively engaged in design and development of a variety of innovative, robust, and competitive new riser systems, as well as improving the existing systems.

Riser solutions have evolved to the point that the challenge now is how to select the best riser solution for the application.

CONCLUSION

Considering the current scenario of the oil and gas industrial market, we can conclude that our design is probably the best in hand proposal we have for performing deep as well as ultra deep water drilling operations.

THANK YOU

RISER TECH

INNOVATIVE|RELIABLE|ECONOMIC