本文選題：隴東地區(qū)　切入點(diǎn)：巖石力學(xué)參數(shù)　出處：《西南石油大學(xué)》2015年碩士論文

【摘要】：鄂爾多斯盆地隴東地區(qū)古生界二疊系氣藏埋藏較深,地質(zhì)情況復(fù)雜,為典型的低孔、低滲、低壓油氣臧。鉆井過程中經(jīng)常發(fā)生井眼崩落與坍塌等井下事故,為了防止井壁失穩(wěn),確保安全鉆進(jìn),選擇合理的泥漿密度窗口就顯得非常重要。另外,工區(qū)內(nèi)大部分井自然產(chǎn)能較低,必須通過壓裂改造措施方能獲得工業(yè)產(chǎn)能。目前,隴東地區(qū)積累了大量的常規(guī)測(cè)井和偶極橫波測(cè)井資料,充分利用測(cè)井資料可以準(zhǔn)確地計(jì)算巖石力學(xué)參數(shù)、地應(yīng)力和地層三壓力及預(yù)測(cè)儲(chǔ)層壓裂縫參數(shù)等,這對(duì)優(yōu)質(zhì)高效安全鉆井和采油工程具有重要的指導(dǎo)意義。 本文以隴東地區(qū)上古生界二疊系石盒子組盒8段和山西組山1段氣藏為研究對(duì)象,以彈性力學(xué)、巖石力學(xué)和壓裂改造機(jī)理為理論基礎(chǔ),重點(diǎn)開展了五個(gè)方面的研究工作：①聲波時(shí)差提取和巖石力學(xué)參數(shù)的測(cè)井計(jì)算；②地應(yīng)力、地層三壓力的計(jì)算及剖面建立；③儲(chǔ)層壓裂縫的測(cè)井預(yù)測(cè)方法研究；④壓前預(yù)測(cè)與壓后結(jié)果的測(cè)井對(duì)比分析；⑤優(yōu)化編程及多井資料分析處理。通過以上工作,取得了以下主要研究成果和認(rèn)識(shí)： (1)整理分析了工區(qū)巖石力學(xué)、鉆井、地質(zhì)、測(cè)井?dāng)?shù)據(jù),從偶極橫波測(cè)井資料中提取縱橫波時(shí)差,歸納了巖石力學(xué)參數(shù)計(jì)算方法并建立了其動(dòng)靜態(tài)轉(zhuǎn)換關(guān)系,獲得了工區(qū)巖石力學(xué)特性剖面； (2)針對(duì)隴東地區(qū)氣層“三低”特征,采用改進(jìn)的地應(yīng)力計(jì)算模型和優(yōu)選的地層三壓力計(jì)算公式,建立了地應(yīng)力和地層三壓力剖面并確定了合理的鉆井液密度窗口； (3)優(yōu)選了水力壓裂縫高和縫寬預(yù)測(cè)模型,并探索了壓裂縫縫長(zhǎng)的測(cè)井預(yù)測(cè)方法,將預(yù)測(cè)結(jié)果同壓后結(jié)果及FracproPT模擬結(jié)果對(duì)比分析,準(zhǔn)確地評(píng)價(jià)壓裂增產(chǎn)效果； (4)基于Forward.NET解釋平臺(tái),編制了地應(yīng)力、地層三壓力計(jì)算和水力壓裂縫延伸預(yù)測(cè)程序,處理了多口井資料,建立了5口井的巖石力學(xué)參數(shù)、地應(yīng)力和地層三壓力剖面,給出了目的層段的鉆井液密度窗口,并預(yù)測(cè)對(duì)比了口井的裂縫擴(kuò)展情況。 通過上述研究,建立了套利用測(cè)井資料計(jì)算地應(yīng)力、地層三壓力和壓裂縫延伸預(yù)測(cè)的方法和技術(shù),可確定合理鉆井液密度窗口并預(yù)測(cè)壓裂縫延伸情況,處理結(jié)果合理可靠,與常用的測(cè)井解釋和壓裂預(yù)測(cè)軟件具有良好的可比性。
[Abstract]:Permian gas reservoirs of the Paleozoic in Longdong area of Ordos Basin are deeply buried and complicated in geological conditions. They are typical low porosity, low permeability and low pressure oil and gas reservoirs. Borehole caving and collapse and other downhole accidents often occur during drilling, in order to prevent wellbore instability. To ensure safe drilling, it is very important to select a reasonable mud density window. In addition, the natural productivity of most wells in the working area is low, and only through fracturing measures can industrial production be obtained. A large amount of conventional logging and dipole shear wave logging data have been accumulated in Longdong area, which can accurately calculate rock mechanics parameters, ground stress and formation three pressures, and predict reservoir fracturing parameters, etc. It has important guiding significance for high-quality and high-efficient and safe drilling and oil recovery engineering. In this paper, the gas reservoirs of the Upper Paleozoic Permian Shihezi formation No. 8 and Shanxi formation Shan 1 are taken as the research objects, and the theory of elasticity, rock mechanics and fracturing mechanism are taken as the theoretical basis. Five aspects of research work have been carried out emphatically, namely, extracting the acoustic time difference from 1 to 1 and logging the rock mechanics parameters to calculate the in-situ stress. The calculation of formation three pressure and the Establishment of profile the logging Prediction method for the pressure fracture of the reservoir No. 3; A study on the log correlation analysis of the pre-pressure-prediction and post-fracturing results of No. 4 reservoir A _ (5) optimized programming and multi-well data analysis and processing. The following main research findings and understandings have been achieved:. 1) the rock mechanics, drilling, geology and logging data in the working area are analyzed, the P-S wave time difference is extracted from the dipole shear wave logging data, the calculation method of rock mechanics parameters is summarized and the dynamic and static transformation relations are established. The rock mechanical characteristic profile of the working area is obtained. (2) in view of the "three low" characteristics of gas reservoir in east Gansu, using the improved calculation model of in-situ stress and the optimum formula of three pressures of formation, the section of ground stress and formation three pressure is established and the reasonable window of drilling fluid density is determined. The prediction model of hydraulic pressure fracture height and fracture width is selected, and the logging prediction method of fracturing fracture length is explored. The results after same pressure and FracproPT simulation results are compared and analyzed to evaluate the effect of fracturing production increase accurately. (4) based on the Forward.NET interpretation platform, a program for prediction of in-situ stress, formation three pressures and hydrostatic fracture extension is developed. The data of multiple wells are processed, and the rock mechanics parameters, in-situ stress and formation three pressure profiles of five wells are established. The drilling fluid density window of the target interval is given, and the fracture propagation of the well is predicted and compared. Through the above research, the method and technology of calculating ground stress, formation three pressure and fracturing extension with well logging data are established. The reasonable drilling fluid density window can be determined and the fracturing extension can be predicted, and the treatment result is reasonable and reliable. It has good comparability with the commonly used well logging interpretation and fracturing prediction software.
【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
【分類號(hào)】：TE31;P631.81

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