中国煤炭地质
中國煤炭地質
중국매탄지질
COAL GEOLOGY OF CHINA
2013年
7期
13-17
,共5页
黄少华%孙同英%冀昆%邹婧
黃少華%孫同英%冀昆%鄒婧
황소화%손동영%기곤%추청
柿庄南区块%排水采气机理%早期生产特征%开采建议
柿莊南區塊%排水採氣機理%早期生產特徵%開採建議
시장남구괴%배수채기궤리%조기생산특정%개채건의
Shizhuang southern block%mechanism of gas well production with water withdrawal%early stage production characteristics%exploitation proposal
从水文地质的角度揭示了不同情况下单井的排水采气机理。在此基础上结合柿庄南区块59口井的实际排采数据,综合分析了气水产量，井底流压，套压及动液面随时间的变化曲线；并将早期生产特征归纳为3种类型：①低产水-高产气型，见气早，产气量高（>1000 m3/d）、产量递减缓慢、峰值产量高，日产水量小（<2m3/d），套压高；②低产水-中低产气型，日产气小于1000 m3，产量衰减明显且波动大，排水期较长；③高产水型，产气极少或无，日产水量大（>10m3/d），动液面下降缓慢，套压很低或为零。最后针对不同类型的低产井，提出相应的开采建议：低产水-低产气型井可采用二次压裂措施，改善煤层渗透率；高产水井可通过无机堵水或加大排采强度等方式排采；煤层气井排采要勇于实践，探索适合该区不同煤层的成功排采方法。
從水文地質的角度揭示瞭不同情況下單井的排水採氣機理。在此基礎上結閤柿莊南區塊59口井的實際排採數據,綜閤分析瞭氣水產量，井底流壓，套壓及動液麵隨時間的變化麯線；併將早期生產特徵歸納為3種類型：①低產水-高產氣型，見氣早，產氣量高（>1000 m3/d）、產量遞減緩慢、峰值產量高，日產水量小（<2m3/d），套壓高；②低產水-中低產氣型，日產氣小于1000 m3，產量衰減明顯且波動大，排水期較長；③高產水型，產氣極少或無，日產水量大（>10m3/d），動液麵下降緩慢，套壓很低或為零。最後針對不同類型的低產井，提齣相應的開採建議：低產水-低產氣型井可採用二次壓裂措施，改善煤層滲透率；高產水井可通過無機堵水或加大排採彊度等方式排採；煤層氣井排採要勇于實踐，探索適閤該區不同煤層的成功排採方法。
종수문지질적각도게시료불동정황하단정적배수채기궤리。재차기출상결합시장남구괴59구정적실제배채수거,종합분석료기수산량，정저류압，투압급동액면수시간적변화곡선；병장조기생산특정귀납위3충류형：①저산수-고산기형，견기조，산기량고（>1000 m3/d）、산량체감완만、봉치산량고，일산수량소（<2m3/d），투압고；②저산수-중저산기형，일산기소우1000 m3，산량쇠감명현차파동대，배수기교장；③고산수형，산기겁소혹무，일산수량대（>10m3/d），동액면하강완만，투압흔저혹위령。최후침대불동류형적저산정，제출상응적개채건의：저산수-저산기형정가채용이차압렬조시，개선매층삼투솔；고산수정가통과무궤도수혹가대배채강도등방식배채；매층기정배채요용우실천，탐색괄합해구불동매층적성공배채방법。
From the perspective of hydrogeology revealed single well gas production with water withdrawal mechanism under different conditions. On this basis, combined with actual production data from 59 wells of Shizhuang southern block has comprehensively ana-lyzed gas and water yields, bottom flow pressure, casing pressure and dynamic liquid level time variation. The early stage production characteristics have been reduced to 3 types:①low water and high gas yield type, characterized by early gas breakthrough, high gas yield (>1 000m3/d), slower yield diminishing, high peak production, smaller daily water yield (<2 m3/d) and high casing pressure;②low water and medium low gas yield type, characterized by daily gas yield less than 1 000m3, obvious yield diminishing with fluctuation, and longer drainage period;③high water yield type, characterized by very few gas yield or no, large daily water yield (>10 m3/d), slow dy-namic liquid level decline, and casing pressure very low or zero. Finally aiming at different typed low yield wells put forward correspond-ing exploitation proposals:for low water and medium low gas yield type wells can use secondary fracturing to promote coal seam permea-bility;high water yield type wells can use inorganic water plugging or to increase drainage intensity. CBM well drainage should have the courage to practice, explore successful drainage method propitious to different coal seams in the area.
