油气藏评价与开发
油氣藏評價與開髮
유기장평개여개발
Reservoir Evaluation and Development
2015年
5期
50-54
,共5页
致密砂岩气藏%压裂水平井%应力敏感%滑脱效应%高速非达西%井筒压降
緻密砂巖氣藏%壓裂水平井%應力敏感%滑脫效應%高速非達西%井筒壓降
치밀사암기장%압렬수평정%응력민감%활탈효응%고속비체서%정통압강
tight sandstone gas reservoir%fractured horizontal well%stress sensitivity%slippage effect%high velocity non-Darcy%wellbore drawdown
致密砂岩气藏储层非达西渗流特征使得其不同于常规气藏，准确预测致密砂岩气藏压裂水平井产能至关重要。基于致密砂岩气藏压裂水平井渗流机理，考虑应力敏感、滑脱效应、气体高速非达西流以及井筒压降对产能的影响，定义气体广义拟压力，建立了致密气藏储层—裂缝—井筒耦合产能计算新模型。实例分析表明，利用新模型计算无阻流量结果与产能测试结果相对误差仅为3.08%，相对误差较小，说明新模型具有较高的准确性。研究表明，随着裂缝条数、裂缝半长以及滑脱因子的增大，无阻流量增大，而随着应力敏感指数的增大，无阻流量逐渐减小，且井底流压较小时更加明显。研究为致密气藏压裂水平井流入动态研究以及裂缝参数优化设计提供了理论依据。
緻密砂巖氣藏儲層非達西滲流特徵使得其不同于常規氣藏，準確預測緻密砂巖氣藏壓裂水平井產能至關重要。基于緻密砂巖氣藏壓裂水平井滲流機理，攷慮應力敏感、滑脫效應、氣體高速非達西流以及井筒壓降對產能的影響，定義氣體廣義擬壓力，建立瞭緻密氣藏儲層—裂縫—井筒耦閤產能計算新模型。實例分析錶明，利用新模型計算無阻流量結果與產能測試結果相對誤差僅為3.08%，相對誤差較小，說明新模型具有較高的準確性。研究錶明，隨著裂縫條數、裂縫半長以及滑脫因子的增大，無阻流量增大，而隨著應力敏感指數的增大，無阻流量逐漸減小，且井底流壓較小時更加明顯。研究為緻密氣藏壓裂水平井流入動態研究以及裂縫參數優化設計提供瞭理論依據。
치밀사암기장저층비체서삼류특정사득기불동우상규기장，준학예측치밀사암기장압렬수평정산능지관중요。기우치밀사암기장압렬수평정삼류궤리，고필응력민감、활탈효응、기체고속비체서류이급정통압강대산능적영향，정의기체엄의의압력，건립료치밀기장저층—렬봉—정통우합산능계산신모형。실례분석표명，이용신모형계산무조류량결과여산능측시결과상대오차부위3.08%，상대오차교소，설명신모형구유교고적준학성。연구표명，수착렬봉조수、렬봉반장이급활탈인자적증대，무조류량증대，이수착응력민감지수적증대，무조류량축점감소，차정저류압교소시경가명현。연구위치밀기장압렬수평정류입동태연구이급렬봉삼수우화설계제공료이론의거。
The non-Darcy seepage characteristic makes tight sandstone gas reservoir be different from conventional gas reservoir. It is important to accurately predict productivity of fractured horizontal wells in tight sandstone gas reservoir. According to percola?tion mechanism, considering the influence of stress sensitivity, slippage effect, high velocity non-Darcy and wellbore drawdown on productivity, gas generalized pseudopressure is defined. Moreover, new productivity calculation model of reservoir, fracture, well?bore coupling in tight sandstone gas reservoir is established. Example analysis shows that compared with productivity test results, relative error is only 3.08 % by using this new model. The small error indicates that this new model has good accuracy. Research shows that as the increasing of fracture number, fracture half length and slippage factors, absolute open flow(AOF) increases. How?ever, as the increasing of stress sensitivity index, the AOF decreases, especially when bottom hole flowing pressure(BHFP) is low. The researches provide theoretical basis for studying inflow performance relationship(IPR) and fracture parameter optimization of fractured horizontal wells in tight sandstone gas reservoir.
