【摘要】：以塔中順南地區(qū)碳酸鹽巖儲(chǔ)集層為例,分析碳酸鹽巖儲(chǔ)集層鉆井井涌特征,建立井涌風(fēng)險(xiǎn)定量評(píng)價(jià)方法,并進(jìn)行算例分析。依據(jù)鉆井地質(zhì)資料,分析塔中順南地區(qū)碳酸鹽巖儲(chǔ)集空間特點(diǎn)與氣體侵入井筒機(jī)制,發(fā)現(xiàn)儲(chǔ)集層裂縫及孔洞發(fā)育,氣體主要以壓差與氣液置換方式侵入井筒。綜合考慮氣體侵入井筒機(jī)制、氣體在井筒中運(yùn)移規(guī)律和井筒溫度-壓力場(chǎng),并引入井筒氣相體積分?jǐn)?shù)密度函數(shù),建立了井涌風(fēng)險(xiǎn)定量評(píng)價(jià)方法和井控風(fēng)險(xiǎn)分級(jí)方法。算例分析結(jié)果表明:可采用施加井口回壓法判定井底氣體侵入方式;碳酸鹽巖儲(chǔ)集層孔縫洞發(fā)育特征和酸性氣體對(duì)井筒氣相體積分?jǐn)?shù)影響較大,易引發(fā)難監(jiān)測(cè)、高強(qiáng)度井涌;井深、井徑、鉆井液密度、鉆井液排量、鉆井液黏度和鉆速對(duì)井涌風(fēng)險(xiǎn)的影響依次減弱。
[Abstract]:Taking carbonate reservoir in Shunan area of Tazhong as an example, the characteristics of well bore in carbonate reservoir are analyzed, and the quantitative evaluation method of well bore risk is established. Based on drilling geological data, the characteristics of carbonate reservoir space and the mechanism of gas intrusion into wellbore in Shunnan area of Tazhong are analyzed. It is found that reservoir fractures and holes are developed, and gas mainly invades the wellbore by pressure difference and gas-liquid replacement. Considering the mechanism of gas intrusion into wellbore, gas migration law and wellbore temperature-pressure field in wellbore, and introducing gas phase volume fraction density function of wellbore, a quantitative evaluation method of wellbore outburst risk and a well control risk classification method are established. The result of example analysis shows that the method of applying wellhead back pressure can be used to determine the invasion mode of bottom-hole gas, the characteristics of pore fracture and cavity development in carbonate reservoir and acid gas have great influence on gas phase volume fraction of wellbore, which is easy to lead to difficult monitoring and high intensity wellbore. The effects of well depth, well diameter, drilling fluid density, drilling fluid displacement, drilling fluid viscosity and drilling speed on wellbore risk are weakened in turn.
【作者單位】： 中國(guó)石油大學(xué)(華東)石油工程學(xué)院;中海油能源發(fā)展股份有限公司工程技術(shù)深圳分公司;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2015CB251200) 國(guó)家科技重大專項(xiàng)(2016ZX05020-006) 長(zhǎng)江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(IRT_14R58)
【分類號(hào)】：TE28

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