BZ25-1油田砂岩酸化技术研究

发布时间：2018-08-20 20:27

【摘要】：酸化已在海上油田得到广泛应用,BZ25-1油田是我国目前海上已开发的较大油田,其主力储层沙河街的酸化成败是其降本增效的关键。本文从BZ25-1油田地质油藏资料入手,通过文献资料调研,挑选出土酸、氟硼酸、多氢酸三种液体体系作为研究对象,通过室内实验室物理模拟,筛选出最适合BZ25-1油田的酸液体系,在“两酸三矿物”酸化模型基础上建立实际酸化作业时酸液沿井筒径向流动的数学模型并对其进行离散和计算： (1)论证了酸化作业在BZ25-1的可行性。通过调研国内外砂岩酸化技术的进展及国内较常用的几种酸化手段,分析BZ25-1油田沙河街储层的储层物性和沉积特征,证实酸化作业是可以在BZ25-1油田开展的。 (2)研究了BZ25-1油田的储层特性及适应的酸化方法。通过五敏实验得出BZ25-1油田储层潜在的伤害主要表现为较强的水敏,一定的速敏和酸敏性,储层结构疏松,酸化易造成粘土微粒运移、出砂。须采用深部解堵酸化。 (3)通过室内实验室物理模拟,筛选出适合BZ25-1油田的酸液体系。挑选出土酸、氟硼酸、多氢酸三种液体体系作为研究对象,并优选评价了各种酸化添加剂。 (4)建立“两酸三矿物”酸化模型并进行数值求解。岩芯酸化效果试验表明优选的酸液体系为氟硼酸体系与多氢酸体系,但是考虑矿场实际需要,依然建立砂岩土酸酸化模型。在“两酸三矿物”理论基础上建立实际酸化作业时酸液沿井筒径向流动的数学模型并对其进行离散和计算。 (5)对模拟结果进行解释并给出适合BZ25-1油田酸化的工艺参数。本文提出的一套较为完整的沙河街储层酸化施工工艺及相关模拟和设计方法,可指导设计和矿场应用,利用模型可以计算出适合该油田酸化的工艺参数。实际施工参数还应该根据现场情况进一步调整。
[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.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.2

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