油气藏评价与开发
油氣藏評價與開髮
유기장평개여개발
2014年
1期
21-25
,共5页
低渗透气藏%直井%压裂%有效井径%产能评价
低滲透氣藏%直井%壓裂%有效井徑%產能評價
저삼투기장%직정%압렬%유효정경%산능평개
low permeability gas reservoir%vertical well%fracturing%effective wellbore radius%deliverability evaluation
在拟径向流阶段，有效井筒半径是无因次裂缝导流能力的一个函数。在此基础之上，提出了新的简单实用压后气井产能评价公式。通过文献中两个实例的计算对比验证了该公式的可靠性。分析了多种因素对气井产能影响的强弱程度，结果表明由强到弱的因素依次为地层压力、地层温度、有效厚度、渗透率、裂缝半长、表皮系数、裂缝导流能力。要提高气井产能，行之有效的手段是通过酸化压裂等增产措施来解除近井地带表皮污染和建立高导流能力的渗流通道。
在擬徑嚮流階段，有效井筒半徑是無因次裂縫導流能力的一箇函數。在此基礎之上，提齣瞭新的簡單實用壓後氣井產能評價公式。通過文獻中兩箇實例的計算對比驗證瞭該公式的可靠性。分析瞭多種因素對氣井產能影響的彊弱程度，結果錶明由彊到弱的因素依次為地層壓力、地層溫度、有效厚度、滲透率、裂縫半長、錶皮繫數、裂縫導流能力。要提高氣井產能，行之有效的手段是通過痠化壓裂等增產措施來解除近井地帶錶皮汙染和建立高導流能力的滲流通道。
재의경향류계단，유효정통반경시무인차렬봉도류능력적일개함수。재차기출지상，제출료신적간단실용압후기정산능평개공식。통과문헌중량개실례적계산대비험증료해공식적가고성。분석료다충인소대기정산능영향적강약정도，결과표명유강도약적인소의차위지층압력、지층온도、유효후도、삼투솔、렬봉반장、표피계수、렬봉도류능력。요제고기정산능，행지유효적수단시통과산화압렬등증산조시래해제근정지대표피오염화건립고도류능력적삼류통도。
In the pseudoradial flow period, an effective wellbore radius is like a function for dimensionless fracture diverting capaci-ty (FCD). On this basis, a new simple and practical deliverability evaluation formula of fractured gas well is proposed. The reliabili-ty of the formula was proved by comparing two examples calculation in literatures, thereby analyzing the degree of various factors in-fluencing gas well deliverability. The results show that the order of factors from strong to weak is formation pressure, formation tem-perature, effective thickness, permeability, fracture half-length, skin factor, fracture conductivity. In order to improve gas well pro-ductivity, the effective means are using stimulation treatment of fracturing and acidizing, which can resolve near-well formation damage and establish flow channel with high flow conductivity.
