Horizontal Drilling Technology Review, Current Applications, and It s Future in Developing Kansas Petroleum Resources
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1 Horizontal Drilling Technology Review, Current Applications, and It s Future in Developing Kansas Petroleum Resources W. Lynn Watney Kansas Geological Survey Lawrence, KS lwatney@kgs.ku.edu
2 Outline 1. Types of horizontal wells 2. Basic engineering and geology that define drainage radius in horizontal wells, design, and evaluation 3. Statistics on current horizontal drilling in Kansas and types of reservoirs being drilled with laterals 4. Case study in Kansas New lateral in Hunton dolomite, Unger Field, Marion County 5. Expectations for horizontal drilling in the future
3 1. Types of horizontal wells Naturally fractured reservoir Gas-bearing shale Niobrara Chalk (NW KS) Chattanooga Shale (OK) Completion vertical well with induced lateral fractures horizontal well with induced vertical fractures Arbuckle, Hunton Mississippian, Morrow Coal Bed Methane Southeast Kansas Cherkee Joshi Technologies International, Inc.
4 History of Horizontal Wells Short Radius Medium radius, downhole motors, 1985 Re-entry drilling, 1995 Coil tubing drilling underbalanced Rotary steerable system Fracture stimulation of horizontal wells Joshi Technologies International, Inc.
5 Extended Reach Option 1 Water-Jetted Laterals Comparing Radial Drilling Penetration vs. Conventional Perforation Conventional Perforation Average Average: Up to 300 ft. Radial Drilling Perforation Average Up to 300 ft. Radcan Energy Services, Inc.
6 Extended Reach Option 2 Coil-tubing conveyed horizontal lateral --First Highly Efficient Hybrid CT Rig Rapid mob/demob Four trailer loads 2800 ft completed in <24 hrs Important in Niobrara play >1 TC Lateral drilling capability Built and Operating on U.S. Soil World Oil Awards 2005 New Horizons Nominee Colorado Oil & Gas Conservation Commission 2005 Operator Advanced of the Year Drilling Nominee Technology, Yuma, CO & Rosewood Resources, Inc. About 300,000 feet of hole in 7 months Niobrara Chalk, NW Kansas Photo courtesy Tom Gipson, Advanced Drilling Technologies, LLC
7 Extended Reach Option 3 Lateral Drilling with Conventional Tools Minimal technical risk mature technology used world wide Tight directional control Unlimited lateral length to drain multiple karst compartments Cost-effective in mature field environment Relative ease to contract conventional rigs low mobilization costs Easy to get directional tools, drillers, and, tool push logging tools from OK Highest operator comfort least steep learning curve Post-drilling tool-push logging helps quantify production potential of the horizontal well and assess level of success
8 Horizontal Drilling in Kansas Definitions & Terms Common terms used to describe horizontal wells MWD - Measurement While Drilling Azimuth, Inclination, Measured Depth LWD - Logging While Drilling most standard vertical hole e-logs PIF - Productivity Improvement Factor multiplier of production increase over offset vertical wells Gerlach (2000)
9 Well plan Target Geosteering Formation evaluation Completion Drilling tools, methods - limitations, costs Production equipment Horizontal Well Planning
10 Measurement While Drilling (MWD) Halliburton GABI Sensor - Gamma/At-Bit Inclination Azimuthal gamma ray detect and avoid shale roof rock at top of the oil reservoir
11 Completion of Horizontal Wells Open hole Slotted liners Case and perforate to isolate oil and gas bearing intervals Install sensor and valves in multilaterals to control flow as laterals water out Acidizing Fracture stimulation Sidetrack to top of pay zone
12 Lateral drilled in Chester sandstone most recently released report
13 Multilaterals with conventional horizontal drilling technology
14 Example of Complex Laterals Idd el Shargi Oil Field,Qatar J. Rush, KGS
15 Idd El Shargi, J. Rush -KGS 300 ft thick limestone reservoir with oil accumulation on broad structural trap Laterals drilled from offshore platforms Field produces ~135,000 BOPD
16 Idd El Shargi, J. Rush -KGS
17 Idd El Shargi, J. Rush -KGS
18 2) Basic engineering and geology that define drainage radius in horizontal wells, design, and evaluation
19 Joshi Technologies International, Inc.
20 Joshi Technologies International, Inc. Note extended drainage area off ends of the lateral
21 Models used to predict recovery of a horizontal well DRILL HERE!
22 Simulation modeling of drainage and oil recovery from horizontal well -- Ness City North Field Ness City North Horizontal Infill Well Production Potential, Drainage & Interference on Existing Wells Horizontal well Oil saturation before horizontal well drilled (Sept 03) Oil saturation after horizontal well drilled (Sept. 13) Ummel 1 (U1) - Prod Loss (Interferrence) Ummel 1 Ummel 1 Cum Oil, BO Cum Oil, BO Ummel 1 No Infill Infill E-W Prod loss, BO Jan Jan Jan Jan Pf2A-24 - Prod Loss (Interferrence) Pf2A-24 Pf2A-24 Cum Oil, BO Cum Oil, BO Pf2A-24 No Infill Infill E-W Prod loss, BO Jan ,362 Jan ,181 42,952 10,229 Jan ,475 47,448 17,027 Jan ,750 53,537 30,213 Production Gain from Infill EW (Infill) Year end Cum Oil, BO Cum Wtr, BW , , , , ,137 1,226, ,675 1,798, ,272 2,847,120
23 Reservoir properties strongly affect how horizontal wells behave Drilling Outcome -- Ness City North
24 3. Statistics on current horizontal drilling and types of reservoirs being drilled with laterals
25 Kansas Joshi Technologies International, Inc.
26 Horizontal Wells Drilled Completion Dates - Horizontal Wells Kansas More 1-Jan-84 1-Jan-87 1-Jan-90 1-Jan-93 1-Jan-96 1-Jan-99 1-Jan-02 1-Jan-05 1-Jan-08 Frequency
27 Horizontal Wells in Kansas (October 2010) Mississippian highlighted Cherry Creek & Goodland Gas Areas (Niobrara) Warsaw & Osage (Mississippian) Dolomite and chert Bradshaw & Hugoton Fields Gas Wells (Chase Group) Osage (Mississippian) Cherty dolomitic oil reservoirs Coal-bed methane Wells (Cherokee Group) Morrow/Chester Arbuckle
28 HORIZONTAL WELLS IN KANSAS Wells with Total 238 oil production producing oil wells 20 Success rate (%) 8.4 Niobrara chalk shallow gas 61 Chase-Council Grove 10 Lansing-Kansas City 2 0 Cherokee CBM 15 McLouth Sandstone 9 0 Morrow-Chester 16 4 Mississippian carbonates 22 6 Viola 7 0 Arbuckle 8 3 October ,430 bbls -- Best horizontal well drilled in Kansas to date an infill well drilled in 1997 by Ensign Operating Company in Mississippian Warsaw Dolomite in Aldrich NE Field, Ness County ft lateral drilled and completed open hole by Halliburton services. initially, low productivity due to mud damage; cleaned up with acid for excellent well
29 4. Case studies in Kansas - Mississippian Warsaw dolomite reservoir in Ness County and Hunton dolomite in Marion County
30 Unger Field Marion County, Kansas Unger Field American Energies Corporation Alan DeGood
31 NW Proposed Location of Lateral Section 19 Unger Field Structure map and cross section index Contour Interval = 5 ft Upper blue number = thickness of Hunton reservoir ft (O/W) DST SI BHP, psi SE Sec 19-T21S-R3E Bottom hole pressure derived from DST /1/1955 1/1/ /31/ /31/ /31/ /31/1959 DST data from: Slocombe 5, 6 Mellot 4 Rood 1, 2, 3, 4, 5, 7 Original O/W ~-1420 ft
32 NW-SE Structural Cross Section #1 Porous Mississippian limestone/ chert Kinderhook Chattanooga Shale Hunton reservoir Target zone for lateral Paralleling cross section 900 ft SP-Caliper-Microlog curves shown SP depicted in color delimiting magnitude
33 Horizontal Drilling Plan Unger Field, Marion County, Kansas 1,700 ft lateral
34 Partners in Unger Field Drilling Design and well site supervision on over 300 horizontal wells drilled including multi-laterals in Oklahoma Hunton, Arbuckle, Barnett Shale and others up to 8,000 lateral displacement Focus Gamma (sensor) -- To avoid shale caprock above reservoir
35 5. Expectations for horizontal drilling in the future
36 Northwest Shelf Shallow gas Niobrara Chalk West Flank CKU Mississippian Osage, Warwaw chert and dolomite reservoirs Central Kansas Uplift Lansing-Kansas City Arbuckle Sedgwick Basin Mississippian Viola & Hunton Hugoton Embayment Hugoton Gas Field Chester, Morrow sandstones, St. Louis limestone Pratt Anticline Mississippian Chert Oil Reservoirs Cherokee Basin CBM Pennsylvanian oil sands
37 Producibility problems addressed with horizontal wells Mature fields often have high water cut, strong water drive Current production practice use conventional vertical wells Limited lateral drainage in vertical well Significant variation in producibility between adjacent wells Residual pockets of oil possibly located in the interwell areas outside the drainage reach of vertical wells Often reservoirs are compartmentalized (karstification and subcropping strata) Wells located in small compartment have short production life, uneconomic cumulative volumes Wells located (by chance) in large compartments long production life Effective pay zones in Kansas are thin (less than 20 ft) Limited resource-reach of operators financial and technical
38 Proposed solution cost-effective extended reach horizontal lateral Has to be cost-effective drilling, logging, and completion Has to be have minimal technical risks for independent operators to be interested and apply for infill drilling Must have tight directional control to -- Reach and drain targeted pockets of remaining reserves in the inter well region Have trajectory constrained within thin pay Would have significant added advantage, if one targeted well could drain multiple karst compartments Needs to produce economic volumes under constrained drawdown in order to reduce water cut Low water cut helps keep oil relative permeability high in the near well region Results in better sweep of residual oil
Slocombe Rood #1 19. Unger Field, Marion County Enhancing Oil Recovery from Mature Reservoirs Using a Lateral with Gamma Ray
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