DOE的常規(guī)能源辦公室宣布:美國能源部在阿拉巴馬與當(dāng)?shù)睾献鏖_始現(xiàn)場試驗(yàn)，對地質(zhì)二氧化碳存貯的潛力與提高煤層甲烷開采率相結(jié)合。

　　FEO說：東南部碳的深埋隔離合作(Secarb)的成員在Tuscaloosa縣，正在把二氧化碳注入到一個(gè)CBM的井里，以確定精心設(shè)計(jì)的水庫是否能接受和吸附大容量的二氧化碳。參加者在實(shí)地試驗(yàn)，這是以黑戰(zhàn)士命名的二氧化碳存貯項(xiàng)目，包括南部的公司、帕索探險(xiǎn)&生產(chǎn)公司、阿拉巴馬的地質(zhì)勘測、和阿拉巴馬的大學(xué)。

　　參加者在6月15日開始灌注二氧化碳，根據(jù)DOE,計(jì)劃在45-60天內(nèi)灌注240噸。據(jù)報(bào)道帕索管理的井為了二氧化碳注入，E&P早被轉(zhuǎn)換了，并且為了監(jiān)測水庫壓力、氣體構(gòu)成、水質(zhì)和二氧化碳流動情況又鉆了四口井。
 

　　DOE認(rèn)為選擇該場地，因?yàn)樗谴砹税⒗婉R西北部和密西西比東北部23,000平方英里的黑色戰(zhàn)士盆地。DOE說盆地中的煤炭有潛力深埋1.1-2.3GT的二氧化碳，或者深埋阿拉巴馬的燃煤電廠在約20年期間的排放總額。DOE并建議提高CBM開采率結(jié)合二氧化碳存貯可能另外擠出1.5tcf煤層氣。

　　該項(xiàng)目將在表面及表面之下監(jiān)測被注入的二氧化碳，確保二氧化碳的存貯是安全和永久的，DOE說。三口深表層下面的監(jiān)視井將使用壓力傳感器和流動性取樣管監(jiān)測各組煤炭。如果二氧化碳保持在原始的煤層中，當(dāng)二氧化碳被注射入一個(gè)煤層時(shí)，其它組應(yīng)該有一個(gè)最小的壓力反應(yīng)。

　　井內(nèi)的壓力也將被監(jiān)測，以確保沒有泄漏，DOE說。并指出淺層地水和土壤氣體的監(jiān)視將提供重要信息，可以用于評估黑戰(zhàn)士盆地碳的深埋和提高CBM開采率對于環(huán)境是安全的。

　　2003年DOE創(chuàng)造它的地區(qū)性碳深埋隔離項(xiàng)目，以確定在許多碳存貯方法中，對于國家的不同的地區(qū)哪種是最適合的。2005年合作項(xiàng)目完成了它的特性化階段，并且是在它的檢驗(yàn)階段，從2005年到2010年經(jīng)營Sunoco，并一般包括小規(guī)模實(shí)地試驗(yàn)，例如黑戰(zhàn)士盆地二氧化碳存貯項(xiàng)目。最后階段，介入發(fā)展期，從2007年到2018年，并且包括大容量的碳存貯測試。國家能量技術(shù)實(shí)驗(yàn)室為FEO管理合作項(xiàng)目。

 

DOE project tests combining carbon dioxide storage, CBM recovery

Jun 21, 2010 (2010-01-21)
Nick Snow
OGJ Washington Editor  

WASHINGTON, DC, June 21 -- A US Department of Energy regional partnership has begun field testing the potential for combining geologic carbon dioxide storage with enhanced coal-bed methane recovery at an Alabama site, DOE’s Fossil Energy Office announced.

FEO said members of the Southeast Regional Carbon Sequestration Partnership (Secarb) are injecting CO2 into a CBM well in Tuscaloosa County to determine if mature CBM reservoirs are capable of receiving and adsorbing significant CO2 volumes. Participants in the field test, known as the Black Warrior CO2 Storage Project, include Southern Co., El Paso Exploration & Production Co., the Geological Survey of Alabama, and the University of Alabama.
 

The participants began injecting CO2 on June 15, and plan to inject 240 tons over 45-60 days, according to DOE. It said that a well operated by El Paso E&P had been converted earlier for CO2 injection, and four wells were drilled to monitor reservoir pressure, gas composition, water quality, and the CO2 plume.

DOE said the site was selected because it was representative of the 23,000-sq-mile Black Warrior basin in northwestern Alabama and northeastern Mississippi. Coal in the basin has the potential to sequester 1.1-2.3 GT of CO2, or about the amount emitted by Alabama’s coal-fired power plants over 20 years, it said. Enhanced CBM recovery combined with CO2 storage could squeeze another 1.5 tcf of gas from these coal seams, it suggested.

The project will monitor injected CO2 at and below the surface to ensure that storage is safe and permanent, DOE said. Three deep subsurface monitoring wells will use pressure transducers and fluid sampling tubes to monitor the coal groups. While CO2 is injected into one coal seam, the others should display a minimal pressure response if the CO2 remains in the original coalbed.
 

Pressures will also be monitored inside the well to ensure that there are no leaks, DOE said. Shallow groundwater and soil gas monitoring will provide important information which can be used to evaluate whether Black Warrior basin carbon sequestration and enhanced CBM recovery is environmentally safe, it indicated.

DOE created its regional carbon sequestration program in 2003 to determine which of numerous carbon storage approaches are best suited for different regions of the country. The partnership program completed its characterization phase in 2005 and is in its validation phase, which runs from 2005 to 2010 Sunoco and generally includes small-scale field tests such as the Black Warrior Basin CO2 Storage Project. The final phase, involving development, will run from 2007 to 2018 and include large-volume carbon storage tests. The National Energy Technology Laboratory manages the partnership program for FEO.
 

Contact Nick Snow at nicks@pennwell.com.