【摘要】：酸化已在海上油田得到廣泛應(yīng)用,BZ25-1油田是我國目前海上已開發(fā)的較大油田,其主力儲層沙河街的酸化成敗是其降本增效的關(guān)鍵。 本文從BZ25-1油田地質(zhì)油藏資料入手,通過文獻(xiàn)資料調(diào)研,挑選出土酸、氟硼酸、多氫酸三種液體體系作為研究對象,通過室內(nèi)實(shí)驗室物理模擬,篩選出最適合BZ25-1油田的酸液體系,在“兩酸三礦物”酸化模型基礎(chǔ)上建立實(shí)際酸化作業(yè)時酸液沿井筒徑向流動的數(shù)學(xué)模型并對其進(jìn)行離散和計算： (1)論證了酸化作業(yè)在BZ25-1的可行性。通過調(diào)研國內(nèi)外砂巖酸化技術(shù)的進(jìn)展及國內(nèi)較常用的幾種酸化手段,分析BZ25-1油田沙河街儲層的儲層物性和沉積特征,證實(shí)酸化作業(yè)是可以在BZ25-1油田開展的。 (2)研究了BZ25-1油田的儲層特性及適應(yīng)的酸化方法。通過五敏實(shí)驗得出BZ25-1油田儲層潛在的傷害主要表現(xiàn)為較強(qiáng)的水敏,一定的速敏和酸敏性,儲層結(jié)構(gòu)疏松,酸化易造成粘土微粒運(yùn)移、出砂。須采用深部解堵酸化。 (3)通過室內(nèi)實(shí)驗室物理模擬,篩選出適合BZ25-1油田的酸液體系。挑選出土酸、氟硼酸、多氫酸三種液體體系作為研究對象,并優(yōu)選評價了各種酸化添加劑。 (4)建立“兩酸三礦物”酸化模型并進(jìn)行數(shù)值求解。巖芯酸化效果試驗表明優(yōu)選的酸液體系為氟硼酸體系與多氫酸體系,但是考慮礦場實(shí)際需要,依然建立砂巖土酸酸化模型。在“兩酸三礦物”理論基礎(chǔ)上建立實(shí)際酸化作業(yè)時酸液沿井筒徑向流動的數(shù)學(xué)模型并對其進(jìn)行離散和計算。 (5)對模擬結(jié)果進(jìn)行解釋并給出適合BZ25-1油田酸化的工藝參數(shù)。 本文提出的一套較為完整的沙河街儲層酸化施工工藝及相關(guān)模擬和設(shè)計方法,可指導(dǎo)設(shè)計和礦場應(yīng)用,利用模型可以計算出適合該油田酸化的工藝參數(shù)。實(shí)際施工參數(shù)還應(yīng)該根據(jù)現(xiàn)場情況進(jìn)一步調(diào)整。
[Abstract]:Acidification has been widely used in offshore oil fields. BZ25-1 oil field is a large oil field which has been developed at sea in China at present. The success or failure of acidizing the main reservoir Shahejie is the key to reduce the cost and increase efficiency. This paper starts with the geological reservoir data of BZ25-1 oilfield, selects three kinds of liquid systems of unearthed acid, fluoroboric acid and polyhydrogen acid as the research object through the research of literature data, and selects the most suitable acid liquid system for BZ25-1 oil field through laboratory physical simulation. Based on the acidizing model of "three minerals of two acids", the mathematical model of the acid fluid flowing along the radial direction of wellbore during actual acidizing operation is established and discretized and calculated. (1) the feasibility of acidizing operation in BZ25-1 is proved. By investigating the development of sandstone acidizing technology at home and abroad and several acidizing methods commonly used in China, the reservoir physical properties and sedimentary characteristics of Shahejie reservoir in BZ25-1 oilfield are analyzed. It is proved that acidizing operation can be carried out in BZ25-1 oilfield. (2) the reservoir characteristics and suitable acidizing methods of BZ25-1 oilfield are studied. Through five sensitive experiments, the potential damage of reservoir in BZ25-1 oilfield is mainly characterized by strong water sensitivity, certain speed sensitivity and acid sensitivity, loose reservoir structure, acidizing easily resulting in clay particle migration and sand production. It is necessary to adopt deep plugging and acidizing. (3) through laboratory physical simulation, the acid system suitable for BZ25-1 oilfield is selected. Three kinds of liquid systems of unearthed acid, fluoroboric acid and polyhydrogen acid were selected as the research object, and various acidizing additives were selected and evaluated. (4) the acidification model of "three minerals of two acids" was established and solved numerically. The results of core acidizing test show that the selected acid system is fluoroboric acid system and polyhydrogen acid system, but considering the actual needs of mine field, the acidification model of sandstone soil is still established. Based on the theory of "three minerals of two acids", the mathematical model of acid fluid flowing along the wellbore radial direction during acidizing operation is established and discretized and calculated. (5) the simulation results are explained and the technological parameters suitable for acidification in BZ25-1 oilfield are given. In this paper, a set of relatively complete acidizing construction technology and related simulation and design method for Shahejie reservoir can be used to guide the design and field application, and the technological parameters suitable for acidizing in the oilfield can be calculated by using the model. The actual construction parameters should be further adjusted according to the site conditions.
【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】：TE357.2

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