Erd 6e5o1i

GROUP 5 ERD ( Extended Reach Drilling ) 1. Harits Aditya Pratama 2. Henna Farhanah 3. I Ketut Bakti Suseno 4. Ilham Rachmad Yuda 5. Irfan Nurrohman 6. Jeffry Martua 7. Kukuh Eka Wijaya 8. M. Iban Iswandi 9. M. Aldio Mahdi 10.M. Zidni Sofwan 11.Marsa Aprilia 12.Mayshithah Zahrani Nurseha 13.Mochamad Rafi Agung 14.M. Abdul Hakim

The Purpose & The Reason why we use ERD

The Advantage & The Weakness of ERD

Definition of ERD

ERD Problems

ERD Equipment

Definition of ERD • ERD wells are generally associated with accessing reservoirs at locations remote from a drill site. Generally, a well is defined as extended reach if it has a Step‐Out Ratio of 2 or more. Step‐out Ratio is defined as the horizontal displacement (HD) divided by the true vertical depth (TVD) at total depth. • ERD well is a well with the Horizontal Displacement more than 4000 m.

Definition of ERD • Even though there are so many definition about ERD. Basicly, ERD is same as with the other horizontal well. We could find the different from the inclination angle ( among 75 o until 80o ) and the horizontal displacement ( up to 4000 meter )

The Purpose of ERD • To improve oil and gas productivity more efficient. • Decreasing the platform unit.

• Developing offshore reservoir which is recognized as non-profit reservoir. • Alternative method for offshore drilling

Why we use ERD? • to reach the deep and far reservoir • When we couldn’t access the reservoir with vertical drilling. • To get the horizontal permeability from a reservoir. • To increase the productivity of oil and gas. • Make a new innovation technically, change the impossibility to possibility.

The Advantage of ERD •  reach the target reservoir which is far from the facility equipment in the surface •  reduce the need for a platform on offshore drilling 

• reach the target reservoir that cannot be achieved by gas drilling vertical because there was a hitch surface as city , lake , mountain, etc Change wet tree technique with dry tree technique

• reach the target a reservoir located under the surface of the sea meanwhile the platform located on the land

The Weakness of ERD • The unstable wellbore because the differential pressure between formation pressure and hydrostatic pressure. It makes the torque increase suddenly • drill string will not extends down the hole for drag excessive It caused because ERD’s limit reached when the friction factor exceed the force which is needed to pull down the drillstring

ERD Equipments

RIG

Drilling Fluid

Drillstring

Casing

RIG Rig is the important equipment for each drilling process. In ERD, the rig called Slant Rig. Slant Rig was designed to provide the inclination angle in wellbore from the surface. It helps to decrease the torque and drag while drilling process. Rig specification (conventional rig or slant rig): • Hookload rig • Drawwork capacity • Drilling fluid pumps capacity

Drillstring Drillstring can affect many factors to the process of gas drilling . Both the quality drillpipe , BHA and a combination of a series of its components is very influential . There ares some factors that influence in drillstring design is as follows: • Drillpipe Quality • HWDP Quality • BHA components

Drillstring (2) 1. Drillpipe The quality of drillpipe is really important because the properties of the pipe itself can hold excessive load as the effect of tension, torque and axial. It needs drillpipe design that can be compared between maximum load drillpipe and internal strength of pipe. 2. Heavy Weight Drillpipe quality HWDP likely to be used in ERD as “er to push” while drilling process. It also can minimize tripping in-out. But due to the heavy weight, hookload of the rig increases and drag at tangent section can be disadvantages of this HWDP. 3. Bottom Hole Assembly Drillpipe quality Important BHA components: MWD and Rotary Steerable System (RSS). MWD used to gives information about TVD, inclination, azimuth, drag and torque. RSS used to direct wellbore and it has better hole cleaning than sliding drilling, especially in build up section.

Casing Largest burden to be borne by rig happens during the installation of the casing. In general the series of pipes are on the condition of tension at the surface. While Insert the very long casing into a drill hole, hence the series of pipes in the surface are on tensile condition because the burden of compression drag very large . This resulted in the rigs not having thrust to degrade casing . Therefore design casing very influential on ERD method.

Casing (2) Casing flotation is a new technology to increase the success of ERD operation. The main benefit of casing flotation is to reduce casing load due to the super massive length of ERD. This method is performed with closing several parts at very bottom of the casing t, so that mud not allowed to fill in hole of the casing. This make the bouyancy effect will be greater in casing to make casing installation easier and can be easily pushed into to the casing depth.

Drilling Fluid ( Mud ) Drilling fluid has many influences in the circulation process of drilling. There are some important parameters of mud in ERD process, •

Viscosity To bring the cutting from the wellbore to surface.

•

Density Create Bouyancy Effect to drillstring.

•

Lubricity to decrease the friction koefisient, then the drag and torque will be

decreasing too. Usually Oil Based Mud (OBM) or Synthetic Based Mud used as drilling fluid

ERD Problems

TORQUE

DRAG

HOLE CLEANING HOOKLOA D

TORQUE Torque levels in ER wells are generally more dependent on wellbore length and tortuousity than tangent angle. Yet, higher angle wells do tend to reduce overall torque levels while drilling since more of the drill string is in compression, and the tension profile in the build section is reduced. However, higher torque values and associated problems such as accelerated casing wear and key seats are seen during back‐reaming operations .

DRAG If the friction force in horizontal section plus WOB is more bigger than the pipe ability. The pipe will buckling. To avoid that, we have controlled the drag force according the pipe ability and hookload of the rig. Drag divided into 2 types, there are: 1. Compressive Drag 2. Tensile Drag

HOOKLOAD Hookload is a burden need to be able to ed by the rig .This burden is accumulation of heavy tubular ( drill pipe or casing ) and drag experienced a series of pipe . The largest hookload happened when the pipe was tripping or stucking.

HOLE CLEANING Hole Cleaning is very important. We have to circulated te mud to wellbore to cleaning the wellbore from cuttings Poor hole cleaning has resulted in problems of: • Inability to transfer weight to the bit • Unexplained and unplanned changes in direction • Lost mud in the pay zone, which limits ultimate productivity due to formation damage • Stuck pipe problems

To reduce some problems • • •

To To To

reduce reduce reduce

torque and drag hole cleaning hookload

To reduce torque and drag • By using TRS (torque reduce sub)

• TRS

• By using LoTAD

Problem hole cleaning

• To enhance hole cleaning, drillstring rotation is used while drilling and backreaming, and with the pipe off the bottom.

Reduction hookload

• By using bouyancy effect from drilling fluid • By using Slant RIG

Reduction drag when running casing • By using bouyancy effect from drilling fluid • Close some part of casing

CONCLUSION ERD is not different with the other horizontal well. ERD is little bit different. It has some characteristic which the ratio of TVD with HD is more than 2. in simple way we can say the ERD has the longest horizontal displacement. Torque, Drag, Hole Cleaning, and Hookload must be controlled because those could occur problems.

Thank you