碎软煤储层产气潜力定量评价——以晋城赵庄矿淮北芦岭矿为例
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摘要
为对碎软低渗透煤储层产气潜力进行有效的定量评价,在等温吸附实验基础的基础上,以临储压差、临废压差、有效解吸量、有效解析效率为指标,对晋城赵庄矿淮北芦岭矿区三口直井煤层气产出潜力进行了定量评价,同时结合煤层气井的排采历史进行了分析验证。研究结果表明:(1)赵庄矿区X-163井的临储压差为1. 52MPa,有效解吸量为5. 35～12. 89m~3/t。芦岭矿区WLG-01井的临储压差为4. 20MPa,有效解吸量介于8. 01～9. 43 m~3/t。芦岭矿区WLG-03井的临储压差为1. 77 MPa,有效解吸量介于9. 48～11. 20 m3/t。说明有效解吸量决定煤层气采收率,临储压差反映见气难易程度,临废压差体现地层能量。临废压差越大,地层能量越强,驱动能力越强,解吸量越大,煤层气井产气潜力越高(2)比较X-163-3井、WLG-01井和WLG-03井煤层气产出潜力及排采历史,验证了芦岭比赵庄研究区的煤储层具有煤层气开发产气潜力和较高产气量的原因,也说明在施工过程中控制较低的井底流压,实现压降漏斗的稳定扩展,压降漏斗完美,并采用二氧化碳伴注压裂工艺,有利于碎软低渗透煤储层煤层气的抽采。
To carry out quantitative assessment for clastic,soft and low permeability coal reservoir gas production potential effectively,on the basis of isothermal adsorption test results,taking the critical reservoir differential-pressure,critical abandonment differentialpressure,effective desorption volume and effective adsorption efficiency as indices,carried out quantitative assessment of CBM production potential for 3 straight wells in the Zhaozhuang coalmine,Jincheng and the Luling coalmine,Huaibei,combined with CBM well drainage history carried out analytical validation. The result has shown:( 1) Critical reservoir differential-pressure is 1. 52 MPa in the well X-163,Zhaozhuang mine area,with effective desorption volume 5. 35 ～ 12. 89 m~3/t; those of WLG-01 in Luling mine area are4. 20 MPa and 8. 01 ～ 9. 43 m~3/t and in well WLG-03 1. 77 MPa and 9. 48 ～ 11. 20 m~3/t respectively. That shows effective desorption volume determines CBM recovery ratio; critical reservoir differential-pressure reflects difficulty of gas breakthrough; critical abandonment differential-pressure reflects producing energy. The larger the critical abandonment differential-pressure,the stronger the producing energy; the stronger the driving force,the larger the desorption volume; all of those can bring about higher CBM well producing potential.( 2) Comparing the CBM production potential and drainage history of wells X-163,WLG-01 and WLG-03 have verified the causation of CBM exploitation potential and higher gas production of Luling study area better than Zhaozhuang study area; also explained during the operation process to control of lower bottom well flow pressure,realize pressure drawdown distribution stable propagation and perfect,together with CO2 injection fracturing technology are favorable to clastic and soft coal reservoir CBM drainage.
To carry out quantitative assessment for clastic,soft and low permeability coal reservoir gas production potential effectively,on the basis of isothermal adsorption test results,taking the critical reservoir differential-pressure,critical abandonment differentialpressure,effective desorption volume and effective adsorption efficiency as indices,carried out quantitative assessment of CBM production potential for 3 straight wells in the Zhaozhuang coalmine,Jincheng and the Luling coalmine,Huaibei,combined with CBM well drainage history carried out analytical validation. The result has shown:( 1) Critical reservoir differential-pressure is 1. 52 MPa in the well X-163,Zhaozhuang mine area,with effective desorption volume 5. 35 ～ 12. 89 m~3/t; those of WLG-01 in Luling mine area are4. 20 MPa and 8. 01 ～ 9. 43 m~3/t and in well WLG-03 1. 77 MPa and 9. 48 ～ 11. 20 m~3/t respectively. That shows effective desorption volume determines CBM recovery ratio; critical reservoir differential-pressure reflects difficulty of gas breakthrough; critical abandonment differential-pressure reflects producing energy. The larger the critical abandonment differential-pressure,the stronger the producing energy; the stronger the driving force,the larger the desorption volume; all of those can bring about higher CBM well producing potential.( 2) Comparing the CBM production potential and drainage history of wells X-163,WLG-01 and WLG-03 have verified the causation of CBM exploitation potential and higher gas production of Luling study area better than Zhaozhuang study area; also explained during the operation process to control of lower bottom well flow pressure,realize pressure drawdown distribution stable propagation and perfect,together with CO2 injection fracturing technology are favorable to clastic and soft coal reservoir CBM drainage.
引文
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[14]拜文华,赵庆波,刘锐娥.山西沁水煤层气田采收率预测[J].现代地质,2001,15(4):438-444.
[15]丁安徐,龚月,叶建国.贵州织金地区龙潭组煤层等温吸附特征研究及应用[J].油气藏评价与开发,2011,1(3):76-80.
[2]蔚远江.准噶尔盆地低煤级煤储层及煤层气成藏初步研究[D].北京:中国地质大学(北京),2003.
[3]许耀波,朱玉双,张培河.紧邻碎软煤层的顶板岩层水平井开发煤层气技术[J].天然气工业,2018,38(9):70-75.
[4]许耀波,朱玉双,张培河.沁水盆地赵庄井田煤层气产出特征及其影响因素[J].天然气地球科学,2019,30(01):119-125.
[5]李彬刚.芦岭煤矿碎软低渗煤层高效抽采技术[J].煤田地质与勘探,2017,45(4):81-84+93.
[6]张群,葛春贵,李伟,等.碎软低渗煤层顶板水平井分段压裂煤层气高效抽采模式[J].煤炭学报,2018,43(1):150-159.
[7]陈贞龙.解吸阶段划分对延川南煤层气田开发的指示意义[J].油气藏评价与开发,2017,7(5):80-84.
[8]Zhang Z,Qin Y,Wang G X,et al. Numerical description ofcoalbed methane desorption stages based on isothermal adsorption experiment[J].Science China:Earth Sciences,2013,56:1029-1036.
[9]康永尚,王金,姜杉钰,等.量化指标在煤层气开发潜力定量评价中的应用[J].石油学报,2017,38(06):677-686.
[10]秦勇,郑长东,王博洋,等.基于等温吸附曲线的煤储层产气潜力定量评价———以黔北地区长岗矿区为例[J].天然气工业,2018,38(9):40-47.
[11]孟艳军,汤达祯,许浩,等.煤层气解吸阶段划分方法及其意义[J].石油勘探与开发,2014,41(5):612-617.
[12]夏鹏.西山煤田古交矿区煤层气富集规律及产能主控因素研究[D].太原:太原理工大学,2017.
[13]傅雪海,秦勇,韦重韬.煤层气地质学[M].江苏徐州:中国矿业大学出版社,2007.
[14]拜文华,赵庆波,刘锐娥.山西沁水煤层气田采收率预测[J].现代地质,2001,15(4):438-444.
[15]丁安徐,龚月,叶建国.贵州织金地区龙潭组煤层等温吸附特征研究及应用[J].油气藏评价与开发,2011,1(3):76-80.
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