石油钻采工艺
石油鑽採工藝
석유찬채공예
OIL DRILLING & PRODUCTION TECHNOLOGY
2015年
3期
61-65
,共5页
页岩气%滑脱%压裂%水平井%产能%渗流
頁巖氣%滑脫%壓裂%水平井%產能%滲流
혈암기%활탈%압렬%수평정%산능%삼류
shale gas%slippage%fracturing%horizontal well%productivity%seepage
页岩气储层的纳米级孔隙中滑脱效应使渗流机理更加复杂，通过建立解析解模型定量分析其影响程度具有实际意义和理论价值。以页岩气藏压裂水平井三线性渗流理论为基础，通过分析滑脱对渗透率影响规律及计算关系，构建了考虑滑脱渗流的数学模型，并对模型进行求解，得到了可用于现场生产预测的压裂水平井产能方程；根据对渗透率增加幅度和产量增加值界定了受滑脱效应影响孔隙阈值；应用所建立模型通过实例计算分析了不同孔隙直径、不同生产压差下滑脱效应分别对产能的增加值，定量地评价了滑脱效应的影响程度，结果表明初期产能增加值可达到1500 m3/d，后期生产也可达到400 m3/d。因此，当页岩气储层孔隙较小进行产能预测时滑脱效应需要被考虑，以便更能科学全面地反映其渗流规律。
頁巖氣儲層的納米級孔隙中滑脫效應使滲流機理更加複雜，通過建立解析解模型定量分析其影響程度具有實際意義和理論價值。以頁巖氣藏壓裂水平井三線性滲流理論為基礎，通過分析滑脫對滲透率影響規律及計算關繫，構建瞭攷慮滑脫滲流的數學模型，併對模型進行求解，得到瞭可用于現場生產預測的壓裂水平井產能方程；根據對滲透率增加幅度和產量增加值界定瞭受滑脫效應影響孔隙閾值；應用所建立模型通過實例計算分析瞭不同孔隙直徑、不同生產壓差下滑脫效應分彆對產能的增加值，定量地評價瞭滑脫效應的影響程度，結果錶明初期產能增加值可達到1500 m3/d，後期生產也可達到400 m3/d。因此，噹頁巖氣儲層孔隙較小進行產能預測時滑脫效應需要被攷慮，以便更能科學全麵地反映其滲流規律。
혈암기저층적납미급공극중활탈효응사삼류궤리경가복잡，통과건립해석해모형정량분석기영향정도구유실제의의화이론개치。이혈암기장압렬수평정삼선성삼류이론위기출，통과분석활탈대삼투솔영향규률급계산관계，구건료고필활탈삼류적수학모형，병대모형진행구해，득도료가용우현장생산예측적압렬수평정산능방정；근거대삼투솔증가폭도화산량증가치계정료수활탈효응영향공극역치；응용소건립모형통과실례계산분석료불동공극직경、불동생산압차하활탈효응분별대산능적증가치，정량지평개료활탈효응적영향정도，결과표명초기산능증가치가체도1500 m3/d，후기생산야가체도400 m3/d。인차，당혈암기저층공극교소진행산능예측시활탈효응수요피고필，이편경능과학전면지반영기삼류규률。
The slippage effect in nano-level pores in shale gas reservoirs makes the seepage mechanism even more complex, and that an analytical solution model was built to quantitatively analyze its inlfuence is of practical signiifcance and theoretical values. Based on trilinear seepage theory for fractured horizontal wells in shale gas reservoirs and analyzing the law of slippage effect on permeability and its calculating relations, a mathematical model was built taking into account the slipped seepage, and a solution was made on the model to obtain an equation of fractured horizontal well productivity, which can be used to forecast the well production. The pore threshold affected by slippage effect is deifned based on the increase range of permeability and the value of production increase. The model was used, through example calculations, to analyze the slippage effect on the increase of productivity under different pore diameters, different production pressure differential, and quantitatively evaluate the magnitude of slippage effect. The result shows that the initial productivity may reach 1 500 m3/d, and the production at later stage may also reach 400 m3/d. Therefore, the slippage effect should be taken into consideration in productivity forecast when the pores of shale gas reservoir are small, as to relfect its seepage regularity more scientiifcally and comprehensively.
