河南油田深度调剖物理模型实验研究
发布时间：2018-07-24 17:51
【摘要】：河南双河油田北块Ⅳ5-11层系非均质性严重,层间水驱动用程度差异大,主力层与非主力层共用一套注采井网,非主力层动用难度很大；吸水剖面不均匀,层间干扰严重,主力层通过水驱扩大波及体积提高采收率余地小；综合含水高,水驱采出程度低,注采井网不完善,多向受效井数少,液流方向难以改善,提高采收率难度大。经过多年的水驱开发,目前已进入中高含水期,产量递减速度加快,局部区域存在注入水沿高渗带窜流、突进,油井含水上升快,动用程度降低,控水稳油形势十分严峻。近几年,河南油田针对砾岩油藏进行了深部调剖技术攻关研究,通过现场试验,形成了一系列深部调剖相关技术,但试验过程存在产出液产聚浓度上升过快,部分井压力上升较高,试验井组效果差异较大等问题,因此有必要加深认识调剖体系在油藏深部的运移、封堵规律,优选出与油藏适应性较好的调剖体系。调剖堵水技术的深入研究就显得尤其重要。弱凝胶调剖技术在三次采油中提高采收率,现在在各大油田中应用的已经比较广泛。其主要作用机理为：应用不同的技术措施将弱凝胶的调剖剂注入到高渗透层,堵住主要的液流通道,液流改道以后就可以更好的进入中低渗透层,从而来提高波及系数和原油的洗油效率。同时弱凝胶在地层中的成胶时间较长,便于长期的进行调剖。由于现在弱凝胶的调剖技术手段都已经比较成熟,成本就变的比较低,对油藏的深度调剖在经济效益的方面来看就非常可观。岩心流动实验,研究了弱凝胶体系的注入性、阻力系数、封堵能力和剖面调剖效果等。刚配制的弱凝胶溶液,当其注入岩心时,具有很好的流度控制能力、在多孔介质中具有良好的的注入性能和传播性能；注入地层成胶后,具有较强的粘附性和韧性以及良好的应力形变能力,易进入高渗透层,起到封堵作用,使后续注入水流改向而进入低渗透层,增大了注入水的扫油面积,提高了注入水的波及效率。文中,第一步是针对该油藏储层特征来建立合适的深部调剖适应性研究的方法,优选出了最适合该油藏的调剖配方(聚合物2000 mg/L+交联剂200mg/L),调剖体系与油藏适应性的标准是：高渗水流优势通道得到封堵,中低渗通道得到动用。第二步,确立深度调剖物模实验的具体设计方案,最终选择用3根lm长的填砂管并联,每根管填砂的渗透率不同,分为高、中、低渗这样可以更好模拟真实地层的非均质性。通过三管并联实验来考察各调剖体系的封堵选择性和提高采收率效果。第三步,调剖之前的准备阶段,包括选择合适的石英砂粒径、摸索填砂的过程、抽真空以及测量孔隙度、渗透率、饱和度等实验内容。第四步,进行物模实验,测量基础数据,通过分析采收率,分流率,残余阻力系数等相关参数优选出注入半径。第五步,通过实验测得的结果与实际地层的基本参数相结合,优化现场作业所用到的调剖半径。
[Abstract]:The IV 5-11 layer of the North block of Shuanghe Oilfield in Henan is of serious heterogeneity, the difference of interlayer water flooding is very different, the main layer and non main layer share a set of injection and production well network, the non main layer is difficult to use, the water absorption section is uneven, the interlayer interference is serious, the main layer is small in the water flooding Kuo Dabo and the volume, and the comprehensive water cut is high and water is water. After many years of water flooding development, it has already entered the middle and high water cut period, the production decline speed is quickening, the injection water is flowing along the high permeability zone, and the water cut is rising rapidly in the oil well, the use degree is reduced and the water control is controlled. The situation of oil stabilization is very severe. In recent years, Henan oilfield has carried out deep profile control research on conglomerate reservoir. Through field test, a series of deep profile control related technologies have been formed, but there are some problems in the test process, such as high rise of production concentration, high pressure rise in some wells and great difference in test well group. It is necessary to deepen the understanding of the migration of the profile control system in the deep reservoir, the law of plugging and the best selection of the profile control system with good adaptability to the reservoir. The deep study of the technique of profile control and water plugging is particularly important. The weak gel profile control technique improves the recovery rate in the three oil recovery, and is now widely used in the major oil fields. It is as follows: using different technical measures to injecting the profile control agent of the weak gel into the high permeable layer and blocking the main flow channel, the liquid flow can be better into the middle and low permeability layer after the diversion of the fluid, thus improving the wave sum coefficient and the oil efficiency of the crude oil. Since the technique of profile control for the weak gel has been mature and the cost is relatively low, the depth profile control of the reservoir is very considerable in the economic benefit. The core flow experiment has studied the injectivity of the weak gel system, the resistance coefficient, the blocking ability and the profile profile control effect. When the core is injected into the core, it has good flow control ability and has good injection and propagation properties in porous media. After injection formation, it has strong adhesion and toughness and good stress deformation ability. It is easy to enter the high permeability layer and play a plugging effect, which makes the following injection flow into low permeable layer. In this paper, the first step is to establish a suitable method to study the adaptability of deep profile control for the reservoir characteristics and optimize the profile of profile control (polymer 2000 mg/L+ crosslinker 200mg/L) for the reservoir. The standard of the profile control system and the adaptability of the reservoir is high. The seepage flow dominant channel is blocked and the medium and low permeability channel is used. Second steps, the concrete design scheme of the depth profile control experiment is established. Finally, 3 LM long sand filling pipes are used in parallel. The permeability of each pipe is different, which can be divided into high, middle and low permeability, which can better simulate the heterogeneity of the real formation. Through the three tube parallel experiment, the experiment can be carried out. The third step, the preparation stage before profile control, including selecting suitable quartz grain diameter, exploring the process of sand filling, vacuum pumping and measuring the porosity, permeability, saturation and other experimental contents. The fourth step, the model experiment, the measurement of the basic data, and the analysis of recovery yield. The injection radius is optimized by the relative parameters such as the diversion rate and the residual resistance coefficient. The fifth step, through combining the experimental results with the basic parameters of the actual formation, optimizes the profile control radius used in the field operation.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357
本文编号：2142176
[Abstract]:The IV 5-11 layer of the North block of Shuanghe Oilfield in Henan is of serious heterogeneity, the difference of interlayer water flooding is very different, the main layer and non main layer share a set of injection and production well network, the non main layer is difficult to use, the water absorption section is uneven, the interlayer interference is serious, the main layer is small in the water flooding Kuo Dabo and the volume, and the comprehensive water cut is high and water is water. After many years of water flooding development, it has already entered the middle and high water cut period, the production decline speed is quickening, the injection water is flowing along the high permeability zone, and the water cut is rising rapidly in the oil well, the use degree is reduced and the water control is controlled. The situation of oil stabilization is very severe. In recent years, Henan oilfield has carried out deep profile control research on conglomerate reservoir. Through field test, a series of deep profile control related technologies have been formed, but there are some problems in the test process, such as high rise of production concentration, high pressure rise in some wells and great difference in test well group. It is necessary to deepen the understanding of the migration of the profile control system in the deep reservoir, the law of plugging and the best selection of the profile control system with good adaptability to the reservoir. The deep study of the technique of profile control and water plugging is particularly important. The weak gel profile control technique improves the recovery rate in the three oil recovery, and is now widely used in the major oil fields. It is as follows: using different technical measures to injecting the profile control agent of the weak gel into the high permeable layer and blocking the main flow channel, the liquid flow can be better into the middle and low permeability layer after the diversion of the fluid, thus improving the wave sum coefficient and the oil efficiency of the crude oil. Since the technique of profile control for the weak gel has been mature and the cost is relatively low, the depth profile control of the reservoir is very considerable in the economic benefit. The core flow experiment has studied the injectivity of the weak gel system, the resistance coefficient, the blocking ability and the profile profile control effect. When the core is injected into the core, it has good flow control ability and has good injection and propagation properties in porous media. After injection formation, it has strong adhesion and toughness and good stress deformation ability. It is easy to enter the high permeability layer and play a plugging effect, which makes the following injection flow into low permeable layer. In this paper, the first step is to establish a suitable method to study the adaptability of deep profile control for the reservoir characteristics and optimize the profile of profile control (polymer 2000 mg/L+ crosslinker 200mg/L) for the reservoir. The standard of the profile control system and the adaptability of the reservoir is high. The seepage flow dominant channel is blocked and the medium and low permeability channel is used. Second steps, the concrete design scheme of the depth profile control experiment is established. Finally, 3 LM long sand filling pipes are used in parallel. The permeability of each pipe is different, which can be divided into high, middle and low permeability, which can better simulate the heterogeneity of the real formation. Through the three tube parallel experiment, the experiment can be carried out. The third step, the preparation stage before profile control, including selecting suitable quartz grain diameter, exploring the process of sand filling, vacuum pumping and measuring the porosity, permeability, saturation and other experimental contents. The fourth step, the model experiment, the measurement of the basic data, and the analysis of recovery yield. The injection radius is optimized by the relative parameters such as the diversion rate and the residual resistance coefficient. The fifth step, through combining the experimental results with the basic parameters of the actual formation, optimizes the profile control radius used in the field operation.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357
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