Tight Gas Sands

Tight Gas Description ImageThe term tight gas sands refers to low-permeability sandstone reservoirs that produce primarily dry natural gas. A tight gas reservoir is one that cannot be produced at economic flow rates or recover economic volumes of gas unless the well is stimulated by a large hydraulic fracture treatment and/or produced using horizontal wellbores. This definition also applies to coalbed methane, shale gas, and tight carbonate reservoirs. Tight sands produce about 6 tcf of gas per year in the United States, about 25% of the total gas produced. The Energy Information Administration estimates that 310 tcf of technically recoverable tight gas exists within the US, representing over 17% of the total recoverable gas. Worldwide, more than 7,400 tcf of natural gas is estimated to be contained within tight sands, with some estimates as large as 30,000 TCF.

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Tight Gas News

TIGHT GAS SANDS DRILLING BUOYING U.S. E&D ACTIVITY

Nov 2, 1992 Patrick Crow Washington Editor A.D. Koen Gulf Coast News Editor U.S. federal tax credit for drilling wells in tight gas sands formations has contributed significantly to U.S. exploration and development activity. The credit, due to expire for new wells at yearend, has been a key factor in the rebounding U.S. active rig count in second half 1992. Drilling in tight gas sands currently accounts for as much as one third of the active U.S. rig count.

RUSSIAN VENTURES-1 EVALUATING OIL, GAS OPPORTUNITIES IN WESTERN SIBERIA-LOG AND CORE DATA

Nov 23, 1992 William Connelly Pangea International Inc. Golden, Colo. Jack Krug Questa Engineering Corp. Golden, Colo. Wells drilled in Russia are broadly classified as "research" wells and "production" wells. Research wells are drilled by the local geologic institutes, known as geologia, and include exploration and delineation wells. Production wells are drilled by the local production institutes, called neft, for the purpose of developing and producing delineated fields.

ASHLAND TO BOOK TIGHT GAS CREDITS

Nov 30, 1992 Officials of Ashland Oil expect to accrue as much as $67 million of Section 29 tax credits for gas produced from qualified U.S. tight sands and Devonian shale wells through 2002, when availability of the credit expires. The credit in the company's 1992 fiscal year ended last Sept. 30 added $9 million to net income, During 1989-92, Ashland drilled 182 shallow development wells to qualified nonconventional formations in the Appalachian basin. With deadline for drilling qualified wells

INDUSTRY BRIEFS

Dec 28, 1992 TRANSCO ENERGY CO. will seek Federal Energy Regulatory Commission approval to restructure its gas marketing businesses into a single organization. Transco Gas Marketing Co. (TGMC) would handle certificated sales currently made by Transcontinental Gas Pipe Line Corp. (TGPL) and Texas Gas Transmission Corp. units and uncertificated services offered by Transco Energy Marketing Co. and TXG Gas Marketing Co. TGMC would provide TGPL and Texas Gas systems merchant service under FERC Order 636 and

U.S. INDUSTRY TRIES TO FATHOM ROUTES TO CLINTON ENERGY GOALS

Feb 2, 1993 PATRICK CROW Washington Editor Now that Bill Clinton has taken office as U.S. president, he must cross the chasm between his promises for change and fulfillment of those promises. There's not much doubt about what direction the Clinton administration will take on energy issues (OGJ, Oct. 12, 1992, p. 21), particularly on use of natural gas, increased conservation, and environmental policy. But it's risky for outsiders to predict what precise routes the new administration might choose to

NEW GAS INFORMATION CENTER OPENS

Apr 12, 1993 The Gas Research Institute (GRI) recently opened a fourth natural gas supply information center that allows gas producers ready access to GRI's most recent research results. Located in the reference library of Allied Geophysical Laboratories at the University of Houston, the center is open to everyone.

TIGHT GAS DRILLING BRINGS COLORADO'S WATTENBERG FIELD ITS BUSIEST YEAR

Jun 21, 1993 Drilling in northeastern Colorado's Wattenberg field shows no sign of slowing down even though the federal tax credit applicable to tight sand gas wells was not extended, says a report by Petrie Parkman & Co., Denver. Wattenberg's main operators plan to drill more than 1,000 wells in the field this year, making it one of the busiest in the U.S. Most present drilling targets gas in Cretaceous Codell and Niobrara low permeability sands at 6,700-8,200 ft, but the field has seven potential

EIA LISTS DECLINE IN U.S. OIL, GAS, GAS LIQUIDS

Oct 4, 1993 A tally by the Energy Information Administration shows U.S. proved reserves of oil, gas, and gas liquids declined in 1992 due to low oil and gas prices that reined drilling. EIA said oil reserves were down 937 million bbl, or 3.8%, to 23.745 billion bbl, largely because low prices pushed oil well completions down 28% to 8,640, a 20 year low. The 3.8% drop was more than twice the average decline of 1.7%/year for the past decade. While most areas had declines, two areas accounted for 73% of the

SIMULATION VERIFIES ADVANTAGES OF MULTIPLE FRACS IN HORIZONTAL WELL

Nov 29, 1993 Richard F. Walker, Erwin Ehrl, Mahmoud Arasteh Mobil Erdgas-Erdol GmbH Celle, Germany Simulation studies indicate that the emerging technology of multiple fractured horizontal wells (MFHW) is a strong candidate for economic development of tight gas reserves in Germany. Mobil Erdgas Erdol GmbH (MEEG) conducted the feasibility study for the exploitation of low-permeability gas sands in the Sohlingen field in northwest Germany (Fig. 1). In this area, MEEG has identified the presence of large

GAS DEMAND HELPS SPARK DRILLING ACTIVE IN U.S.

Apr 11, 1994 A strong U.S. gas market signals sustained drilling for gas through first quarter 1994, laying the groundwork for continued growth in the gas industry. Seven solid years of growing gas consumption, coupled with dwindling U.S. deliverability, have brought U.S. gas supply and demand into a precarious balance. At a time when low oil prices are prompting many producers to trim oil directed capital and exploration spending, almost 4 years of consistently higher U.S. gas prices except for first

TIGHT GAS SANDS STUDY BREAKS DOWN DRILLING AND COMPLETION COSTS

Jun 6, 1994 Barry Brunsman Gas Research Institute Chicago Bryan Saunders S.A. Holditch & Associates Inc. College Station, Tex. Given the high cost to drill and complete tight gas sand wells, advances in drilling and completion technology that result in even modest cost savings to the producer have the potential to generate tremendous savings for the natural gas industry.

MERRILL LYNCH ASSESSES RESERVE ADDITION COSTS

Jul 18, 1994 A group of 15 major companies chalked up increased costs per equivalent barrel to find, develop, and buy U.S. oil and gas reserves last year. But those costs showed a moderate decline worldwide, says a review by Merrill Lynch, Pierce, Fenner & Smith Inc. The New York investment firm's review of the group's unweighted finding, development, and acquisition costs shows an average $5.71/barrel of oil equivalent (BOE) in the U.S. during 1993. The figure was $4.69/BOE in 1992.

SERVICE COMPANY ALLIANCE REDUCES TIGHT SANDS FRAC COSTS

Aug 15, 1994 Jeffrey L. Hunter Pennzoil Exploration & Production Co. Houston Stephen G. Stuchly Halliburton Energy Services Houston Smaller, multiple-stage fracture treatments, worked out by an alliance between a producing and a service company, were a significant element in reducing costs for fracturing Carthage Cotton Valley infill wells in Panola County, Texas. The 1991-1992 study 1 made by Pennzoil Exploration & Production Co. and Halliburton Energy Services, allowed Pennzoil to lower fracturing costs

MANAGEMENT PERSPECTIVE WHY GAS PRODUCERS SHOULD CAPE ABOUT POWER INDUSTRY DECONTROL

Jan 2, 1995 Vinod K. Dar Chairman Jefferson Gas Systems Inc. Washington, D.C. and Senior Adviser RCG/Hagler, Bailly Inc. The business of producing and selling natural gas seems remote from deregulation and restructuring of the U.S. electricity industry. Gas producers are busy enough understanding and managing technological, capital market, and regulatory changes rippling through the gas industry to fret about what appears to be a completely different enterprise: electricity.

OPTIMIZED FRAC PAD AND GEL IMPROVE WELL PRODUCTIVITY

Mar 20, 1995 To Help optimize pad size and gel loading for hydraulic fracturing, R. Lacy Inc. used a net pressure calculation based on observations made during minifracs run before each fracture stage. Optimized pad volume and gel loading yielded greater fracture length and improved productivity of these Cotton Valley gas wells in East Texas. Although these mature reservoirs have lower bottom hole pressure, recently developed techniques have lessened production decline compared to offsets drilled earlier on

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