本文關(guān)鍵詞： 川東北 陸相地層 漏層性質(zhì) 密度窗口 漏失機(jī)理 測(cè)井　出處：《西南石油大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：川東北陸相地層,地質(zhì)構(gòu)造十分復(fù)雜,地層破碎、裂縫發(fā)育,幾乎所有探井在鉆井過(guò)程中都存在不同程度的漏失問(wèn)題,嚴(yán)重制約了鉆井效率的提高。為實(shí)現(xiàn)安全快速鉆井,井漏問(wèn)題亟待解決,而認(rèn)識(shí)鉆井過(guò)程中的鉆井液漏失機(jī)理是防漏和堵漏的關(guān)鍵。 由于測(cè)井資料隱含著豐富的地層巖石物理信息,所以根據(jù)動(dòng)、靜巖石力學(xué)參數(shù)的轉(zhuǎn)換模型,利用測(cè)井資料計(jì)算出地層的巖石力學(xué)參數(shù),建立地層壓力剖面,計(jì)算出符合該地層的鉆井液安全密度窗口,并驗(yàn)證所使用的實(shí)際鉆井液密度是否合理；還可以利用測(cè)井曲線(xiàn)對(duì)漏失層的響應(yīng)特征,來(lái)具體劃分出漏失層位,并對(duì)漏失層位中的漏失通道性質(zhì)加以描述,明確漏失地層的漏失機(jī)理。論文劃分出了川東北陸相地層裂縫性漏失地層,建立了易漏失地層鉆井液安全密度窗口,發(fā)現(xiàn)某些漏失地層密度窗口較窄或者為負(fù)；并根據(jù)雙側(cè)向測(cè)井資料評(píng)估了裂縫產(chǎn)狀,計(jì)算了裂縫的寬度、孔隙度、滲透率和徑向延伸度等參數(shù),明確了漏失地層的漏失機(jī)理,為堵漏施工措施的優(yōu)化、堵漏材料的優(yōu)選提供依據(jù)。 在明確了工區(qū)漏失層位的漏失機(jī)理之后,針對(duì)工區(qū)地質(zhì)構(gòu)造特征,將裂縫性易漏失層漏失壓力劃分為裂縫性自然漏失壓力、壓裂縫性漏失壓力和裂縫擴(kuò)展性漏失壓力三種類(lèi)型,并給出了相應(yīng)的計(jì)算模型�？紤]到工區(qū)漏失通道性質(zhì)、漏失壓力類(lèi)型及鉆井液流體性質(zhì),本文根據(jù)非牛頓流體力學(xué)和裂縫變形行為,建立了裂縫性自然漏失和裂縫擴(kuò)展性漏失數(shù)學(xué)模型,并將模型模擬結(jié)果與裂縫性自然漏失評(píng)價(jià)實(shí)驗(yàn)和現(xiàn)場(chǎng)實(shí)際漏失進(jìn)行對(duì)比,其誤差范圍基本在25%以?xún)?nèi),在一定程度上驗(yàn)證了所建立漏失模型的合理性。 最后,本文形成了一套以測(cè)井資料為基礎(chǔ)的漏失層位劃分、漏失通道性質(zhì)解釋的方法,并根據(jù)所得出的漏失機(jī)理劃分建立了符合工區(qū)特點(diǎn)的鉆井液漏失模型,為堵漏施工措施的優(yōu)化、堵漏材料的優(yōu)選提供依據(jù)。
[Abstract]:In the continental strata of northeast Sichuan, the geological structure is very complex, the formation is broken and the fractures are developed, almost all the exploration wells have different degree of leakage problem in the drilling process. In order to realize safe and fast drilling, the problem of well leakage is urgent to be solved, and it is the key to recognize the leakage mechanism of drilling fluid in drilling process. Because the log data contain abundant physical information of formation rock, according to the transformation model of dynamic and static rock mechanics parameters, the rock mechanics parameters of formation are calculated by logging data, and the formation pressure profile is established. The safe density window of drilling fluid in accordance with the formation is calculated, and the actual density of drilling fluid used is verified to be reasonable or not. We can also use the response characteristics of logging curve to the leakage layer to divide the leakage layer and describe the properties of the leakage channel in the leakage layer. In this paper, the fractured loss formation in the continental strata of northeast Sichuan is divided, and the safe density window of the drilling fluid is established. It is found that some of the leakage formation density windows are narrow or negative. According to the dual lateral logging data, the fracture occurrence is evaluated, the width, porosity, permeability and radial extension of the fracture are calculated, and the leakage mechanism of the lost formation is determined, which is the optimization of plugging construction measures. To provide the basis for optimal selection of plugging materials. After clarifying the leakage mechanism of the leakage layer in the working area, according to the geological structure characteristics of the work area, the leakage pressure of the fractured vulnerable layer is divided into the natural leakage pressure of the fracture type. There are three types of fracturing leakage pressure and fracture propagating leakage pressure, and the corresponding calculation model is given. Considering the properties of leakage channel, leakage pressure and fluid of drilling fluid in the working area. According to non-Newtonian fluid mechanics and fracture deformation behavior, the mathematical models of natural leakage and propagation leakage of fracture are established in this paper. The simulation results of the model are compared with the experimental results of natural fissure leakage evaluation and the actual leakage in the field. The error range is within 25%, which verifies to a certain extent the rationality of the model. Finally, this paper forms a set of methods to divide the loss layer and explain the nature of the leakage channel based on the logging data, and establishes the drilling fluid leakage model according to the characteristics of the working area according to the leakage mechanism obtained. It provides the basis for the optimization of the construction measures and the optimal selection of plugging materials.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TE28

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