本文選題：低滲氣藏　切入點：試井解釋　出處：《西南石油大學(xué)》2015年碩士論文

【摘要】：國內(nèi)大部分低滲致密氣藏需要經(jīng)過壓裂才能達到工業(yè)開采的要求,而壓裂效果的好壞一直是人們普遍關(guān)注的問題。本文以蘇里格氣田壓裂氣井為研究對象,結(jié)合地質(zhì)學(xué)、滲流力學(xué)、數(shù)值模擬及數(shù)理統(tǒng)計等多個學(xué)科,對蘇里格氣田進行壓后評估分析,完成的工作和取得的主要成果如下： (1)分析了蘇里格氣田的儲集巖性特征、儲集空間特征、儲層物性特征、流體性質(zhì)、溫度和壓力系統(tǒng)等特征,并對儲層進行分類評價,為后續(xù)儲層改造壓后評估提供了基礎(chǔ)材料。 (2)完成蘇里格地區(qū)20塊巖心的氣水相滲實驗,選擇若干條有代表性的相對滲透率曲線進行歸一化處理,得到能夠代表不同類別儲層的平均相對滲透率曲線,在此基礎(chǔ)上分析不同類別儲層相滲曲線特征。 (3)完成蘇里格地區(qū)8塊巖心的應(yīng)力敏感實驗,確定了不同類別儲層的滲透率敏感系數(shù),同時得到無因次滲透率隨地層壓力的變化關(guān)系。 (4)對收集到的兩口井的壓恢資料進行了試井解釋,初步確定了壓裂氣井主要裂縫參數(shù)的大小和分布范圍,為建立壓裂氣井地質(zhì)模型提供依據(jù)。 (5)利用商業(yè)軟件建立壓裂氣井地質(zhì)模型,綜合考慮壓裂裂縫的形態(tài)特征,對壓裂氣井進行生產(chǎn)動態(tài)歷史擬合,并對主要的裂縫參數(shù)進行敏感性分析,選出對壓裂效果影響最大的裂縫參數(shù)。 (6)根據(jù)考慮應(yīng)力敏感的壓裂氣井穩(wěn)態(tài)產(chǎn)能公式,結(jié)合數(shù)值模擬歷史擬合得到的裂縫半長和地層滲透率等參數(shù),對蘇里格氣田20口氣井的產(chǎn)能進行計算,并與試氣報告無阻流量進行對比分析,進一步驗證裂縫半長和地層滲透率的準確性。此外,分析了不同滲透率應(yīng)力敏感系數(shù)對壓裂氣井產(chǎn)能的影響。 (7)應(yīng)用數(shù)學(xué)理論分析方法對壓裂效果進行評價,選取裂縫半長作為壓裂效果的評價指標,施工參數(shù)作為壓裂效果的影響因素,計算影響因素的權(quán)重和關(guān)聯(lián)度,確定壓裂效果影響因素的優(yōu)先順序及影響程度大小。 本文在蘇里格氣田蘇5、蘇59、桃7區(qū)塊儲層巖石滲流實驗研究及典型井壓后試井解釋、單井?dāng)?shù)值模擬、產(chǎn)能評價的基礎(chǔ)上,確定壓裂氣井裂縫半長。在此基礎(chǔ)上,通過熵權(quán)法和灰色關(guān)聯(lián)分析理論對壓裂效果進行評價,形成了一套簡單的、系統(tǒng)的、適合蘇里格低滲氣藏的壓后評價技術(shù),為后續(xù)壓裂施工設(shè)計提供理論依據(jù)。
[Abstract]:Most of the low permeability tight gas reservoirs in China need fracturing to meet the requirements of industrial exploitation, and the quality of fracturing effect has always been a common concern. In this paper, Sulige gas well fracturing is taken as the research object, combined with geology. Seepage mechanics, numerical simulation, mathematical statistics and other disciplines, Sulige gas field post-pressure assessment analysis, the work accomplished and the main results obtained are as follows:. The characteristics of reservoir lithology, reservoir space, reservoir physical property, fluid property, temperature and pressure system of Sulige gas field are analyzed, and the reservoir is classified and evaluated. 2) complete the gas-water phase permeability experiment of 20 cores in Sulige area, select some representative relative permeability curves to normalize, and get the average relative permeability curves which can represent different types of reservoirs. On this basis, the characteristics of different reservoir facies permeability curves are analyzed. 3) the stress-sensitivity experiments of 8 cores in Sulige area are completed, the permeability sensitivity coefficients of different types of reservoirs are determined, and the relationship of dimensionless permeability pressure variation is obtained. 4) well test interpretation of pressure recovery data collected from two wells is carried out, and the size and distribution range of main fracture parameters in fractured gas wells are preliminarily determined, which provides a basis for the establishment of geological model of fracturing gas wells. 5) using commercial software to establish the geological model of fractured gas wells, considering the morphological characteristics of fracturing fractures synthetically, fitting the production history of fracturing gas wells, and analyzing the sensitivity of main fracture parameters. The fracture parameters which have the greatest influence on the fracturing effect are selected. According to the steady-state productivity formula of fracturing gas wells considering stress sensitivity, combined with the parameters of fracture half-length and formation permeability obtained by numerical simulation historical fitting, the productivity of 20 gas wells in Sulige gas field is calculated. The accuracy of fracture half-length and formation permeability is further verified by comparing and analyzing the unobstructed flow rate reported by gas test. In addition, the influence of different permeability stress sensitivity coefficient on the productivity of fractured gas well is analyzed. The fracturing effect is evaluated by the mathematical theory analysis method. The fracture half length is selected as the evaluation index of the fracturing effect, the operation parameter is taken as the influencing factor of the fracturing effect, the weight of the influencing factor and the correlation degree are calculated. The order of priority and the degree of influence of the influencing factors of fracturing effect are determined. Based on the experimental study of rock seepage in Su5, Su59 and peach blocks of Sulige gas field, the interpretation of typical well pressure test, the numerical simulation of single well, and the evaluation of productivity, the fracture length of fractured gas well is determined in this paper. Through entropy weight method and grey correlation analysis theory, a set of simple, systematic and suitable post-pressure evaluation technology for Sulige low permeability gas reservoir is formed, which provides a theoretical basis for subsequent fracturing operation design.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE37

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