本文選題：斜井 + 井壁崩落��； 參考：《斷塊油氣田》2017年05期

【摘要】：準(zhǔn)確獲取深部地層的地應(yīng)力大小和方向,對于安全鉆井作業(yè)、控制井筒出砂和壓裂增產(chǎn)至關(guān)重要。利用井壁破壞信息計算地應(yīng)力的方法已得到廣泛認(rèn)同,甚至已建立了利用井壁崩落寬度計算最大水平地應(yīng)力的模型,但是該計算模型僅限于直井井壁破壞。為此,根據(jù)線性多孔彈性巖石力學(xué)理論,確定了任意斜井井壁崩落位置和張性裂縫位置,找出了間接計算最大水平地應(yīng)力的方法,即利用斜井井壁崩落和張性裂縫建立地應(yīng)力和巖石強(qiáng)度的關(guān)系圖版,根據(jù)實(shí)際巖石強(qiáng)度確定最大水平地應(yīng)力。利用該方法對川西南部斜井成像測井觀測到的井壁破壞信息進(jìn)行了實(shí)例分析,分析結(jié)果表明,該地區(qū)垂深4 663.5 m處的最大水平地應(yīng)力為178.9~180.3 MPa。川西南部地區(qū)正處于逆斷層地應(yīng)力狀態(tài),在較強(qiáng)的水平擠壓應(yīng)力作用下,該地區(qū)的原生斷層接近摩擦極限應(yīng)力狀態(tài),斷層容易滑動,因此該地區(qū)地震頻發(fā)。利用該方法可以根據(jù)任意斜井井壁的破壞情況計算最大水平地應(yīng)力,擴(kuò)展了斜井成像測井資料的應(yīng)用范圍。
[Abstract]:It is very important to accurately obtain the magnitude and direction of in-situ stress in deep formation for the safe drilling operation and the control of wellbore sand production and fracturing production. The method of calculating in-situ stress based on wellbore failure information has been widely accepted, and even a model has been established to calculate the maximum horizontal in-situ stress using wellbore caving width, but the calculation model is limited to vertical wellbore failure. Therefore, according to the theory of linear porous elastic rock mechanics, the caving position and tensile fracture position of arbitrary inclined shaft wall are determined, and the method of indirectly calculating the maximum horizontal stress is found. The relationship between in-situ stress and rock strength is established by using inclined shaft wall caving and tensile fracture, and the maximum horizontal in-situ stress is determined according to the actual rock strength. By using this method, the damage information of borehole wall observed by imaging logging in southwestern Sichuan is analyzed. The results show that the maximum horizontal stress at 4 663.5 m vertical depth in this area is 178.9 m 180.3 MPA. The southern part of Sichuan is in the state of in-situ stress of the reverse fault. Under the action of strong horizontal compression stress, the primary fault in this area is close to the state of frictional limit stress, and the fault is easy to slip, so the earthquake occurs frequently in this area. By using this method, the maximum horizontal stress can be calculated according to the failure of the sidewall of any inclined well, and the range of application of the imaging logging data in the inclined well can be extended.
【作者單位】： 西南石油大學(xué)石油與天然氣工程學(xué)院;
【基金】：國家科技重大專項(xiàng)“準(zhǔn)噶爾盆地致密油開發(fā)示范工程”(2017ZX05070)
【分類號】：TE21
，

本文編號：2070878