【摘要】：河南雙河油田北塊Ⅳ5-11層系非均質性嚴重,層間水驅動用程度差異大,主力層與非主力層共用一套注采井網,非主力層動用難度很大；吸水剖面不均勻,層間干擾嚴重,主力層通過水驅擴大波及體積提高采收率余地小；綜合含水高,水驅采出程度低,注采井網不完善,多向受效井數少,液流方向難以改善,提高采收率難度大。經過多年的水驅開發(fā),目前已進入中高含水期,產量遞減速度加快,局部區(qū)域存在注入水沿高滲帶竄流、突進,油井含水上升快,動用程度降低,控水穩(wěn)油形勢十分嚴峻。近幾年,河南油田針對礫巖油藏進行了深部調剖技術攻關研究,通過現(xiàn)場試驗,形成了一系列深部調剖相關技術,但試驗過程存在產出液產聚濃度上升過快,部分井壓力上升較高,試驗井組效果差異較大等問題,因此有必要加深認識調剖體系在油藏深部的運移、封堵規(guī)律,優(yōu)選出與油藏適應性較好的調剖體系。調剖堵水技術的深入研究就顯得尤其重要。弱凝膠調剖技術在三次采油中提高采收率,現(xiàn)在在各大油田中應用的已經比較廣泛。其主要作用機理為：應用不同的技術措施將弱凝膠的調剖劑注入到高滲透層,堵住主要的液流通道,液流改道以后就可以更好的進入中低滲透層,從而來提高波及系數和原油的洗油效率。同時弱凝膠在地層中的成膠時間較長,便于長期的進行調剖。由于現(xiàn)在弱凝膠的調剖技術手段都已經比較成熟,成本就變的比較低,對油藏的深度調剖在經濟效益的方面來看就非常可觀。巖心流動實驗,研究了弱凝膠體系的注入性、阻力系數、封堵能力和剖面調剖效果等。剛配制的弱凝膠溶液,當其注入巖心時,具有很好的流度控制能力、在多孔介質中具有良好的的注入性能和傳播性能；注入地層成膠后,具有較強的粘附性和韌性以及良好的應力形變能力,易進入高滲透層,起到封堵作用,使后續(xù)注入水流改向而進入低滲透層,增大了注入水的掃油面積,提高了注入水的波及效率。文中,第一步是針對該油藏儲層特征來建立合適的深部調剖適應性研究的方法,優(yōu)選出了最適合該油藏的調剖配方(聚合物2000 mg/L+交聯(lián)劑200mg/L),調剖體系與油藏適應性的標準是：高滲水流優(yōu)勢通道得到封堵,中低滲通道得到動用。第二步,確立深度調剖物模實驗的具體設計方案,最終選擇用3根lm長的填砂管并聯(lián),每根管填砂的滲透率不同,分為高、中、低滲這樣可以更好模擬真實地層的非均質性。通過三管并聯(lián)實驗來考察各調剖體系的封堵選擇性和提高采收率效果。第三步,調剖之前的準備階段,包括選擇合適的石英砂粒徑、摸索填砂的過程、抽真空以及測量孔隙度、滲透率、飽和度等實驗內容。第四步,進行物模實驗,測量基礎數據,通過分析采收率,分流率,殘余阻力系數等相關參數優(yōu)選出注入半徑。第五步,通過實驗測得的結果與實際地層的基本參數相結合,優(yōu)化現(xiàn)場作業(yè)所用到的調剖半徑。
[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.
【學位授予單位】：長江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357

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本文編號：2142176