Embed Size (px)
Citation preview
1
Horizontal [email protected] member of SPE 4353073
RAO MUBARAK ALI
INSTITUTE OF PETROLEUM & NATURAL GAS ENGINEERING MEHRAN UNIVERSITY OF ENGINEERING & TECHNOLOGY
JAMSHORO, SINDH, PAKISTAN
2What is Horizontal Drilling
Horizontal drilling is a technique which drills the well at 900 from the vertical angle.(A vertical well is one with zero inclination angle).
3Historical Background
1950s Russians drilled 43 horizontals 1978 Esso, modern horizontal, Alberta. 1979 Arco drilled to overcome high GOR’s and gas coning. 1979-83 Elf test 3 onshore horizontals; Elf and Agip drill firstOffshore horizontal. 1986 50 horizontals worldwide. Cost 1.5-2 times greater than vertical wells 1987-88 Horizontal well test theory and productivity assessment Guidelines.
Numberof horizontals increased dramatically 1989 265 horizontals drilled worldwide. 1990 1000 horizontals drilled. 1991 First Australian horizontal drilled 1992 Over 2,500 horizontals drilled worldwide - 75% in North America (mostly low
permeability, gas/water coning regions) Developments in hydraulic fracturing, perforating, computer models and screen completion failures in unconsolidated formations
1993-2000 Horizontal wells are drilled world-wide and become routine wells
4Objectives
To avoid gas conning and water conning. In case of Natural Fracture or Induced fracture we use Horizontal
Drilling Technique. Reduce Shale oil. Increase flow rate (because of greater well bore length). Increase contact area in low permeable zones.
5Types of Horizontal Drilling
Ultra-Short radius well Short radius well Medium radius well Large radius well
6Ultra-Short radius well
Technique used: CTD Rig (coil tubing drilling) used well drilled through jetting effect
Specification: Build Angle 450 to 900 per 100 ft Tubing Dia: 1 to 2 inch Turning radius 1 to 2 ft
7Short radius well
Technique used: Wiggly collars used which are flexible, whose Dia is 4 ¾ to 6 inch.
Specification: Build Angle 20 to 50 per 100 ft
Turning radius 20 to 40 ft
Length 250 to 450 ft
Maximum Horizontal Section 889 ft yet
8Medium radius well
Technique used: Special Designed Machines are used or some time RSS(Rotary Steerable
Systems) is used.
Specification: Build Angle 60 to 200 per 100 ft
Turning radius 300 to 800 ft
Maximum Horizontal Section 2000 ftto 4000 ft
9Large radius well
Techniqueused: Common RSS(Rotary Steerable Systems) is used.
Specification: Build Angle 20 to 60 per 100 ft
KOP(kick off point) to Build-up Section 1000 to 3000 ft
Length 1000 ft
10
Thank You
