元284區(qū)塊長6油藏多輪次調(diào)驅(qū)技術(shù)研究與應用
發(fā)布時間：2018-11-10 13:08
【摘要】：長慶油田元284區(qū)塊長6油藏為超低滲透裂縫性油藏,基質(zhì)滲透率在0.34-1.53mD之間,儲層段砂巖裂縫視密度介于0.02-2.94條/m之間。該油藏在注水開發(fā)過程中油井單井產(chǎn)量低、產(chǎn)量遞減快、井組見水方向性明顯,且在實施深部調(diào)剖技術(shù)后,爬坡壓力低,井組含水率下降不明顯,現(xiàn)場應用效果不理想。 本文針對區(qū)塊開發(fā)現(xiàn)狀,研究了適用于該油藏的多輪次調(diào)驅(qū)技術(shù)。對多輪次調(diào)驅(qū)體系進行優(yōu)選與性能評價；利用數(shù)值模擬技術(shù)優(yōu)化多輪次調(diào)驅(qū)注入?yún)?shù)并通過巖心流動實驗對其進行評價；制作兩種平面可視化模型對多輪次調(diào)驅(qū)機理進行初步探討；對典型井組開展多輪次調(diào)驅(qū)的方案設計,并實施現(xiàn)場應用。本文取得以下研究成果： (1)調(diào)驅(qū)體系為預交聯(lián)顆粒和弱凝膠的復合段塞。其中優(yōu)化后的弱凝膠配方為：聚合物HPAM濃度1500mg/L+交聯(lián)劑濃度100mg/L+調(diào)節(jié)劑TJ濃度100mg/L,成膠時間2-3d,成膠強度可控。室內(nèi)評價實驗表明,預交聯(lián)顆粒和弱凝膠調(diào)驅(qū)體系具有良好的抗溫性、抗鹽性和較好的吸水剖面改善能力。體系注入方式和段塞尺寸為先注0.15PV預交聯(lián)顆粒后注0.3PV弱凝膠。 (2)調(diào)驅(qū)參數(shù)優(yōu)化實驗中,在中含水階段(40%-70%)進行多輪次調(diào)驅(qū),井組增油效果會更好,所注弱凝膠在后續(xù)水驅(qū)的推動下沿高滲帶不斷突破并即將失效時開始下一輪次調(diào)驅(qū),調(diào)驅(qū)效果最佳,最佳調(diào)驅(qū)輪次為三輪調(diào)驅(qū)。 (3)巖心流動實驗中,多輪次調(diào)驅(qū)較單次調(diào)驅(qū)產(chǎn)生的爬坡壓力更高、吸水剖面更均勻、調(diào)驅(qū)劑運移更規(guī)律、提高采收率更高(單次調(diào)驅(qū)可提高采收率17.98%、多輪次調(diào)驅(qū)可提高采收率26.8%)。 (4)多輪次調(diào)驅(qū)機理中,減小單輪調(diào)驅(qū)劑用量可提高封堵微小裂縫的幾率、有效改善驅(qū)油路徑并擴大波及效率。 (5)對元294-53井組進行了調(diào)驅(qū)方案設計并實施現(xiàn)場應用后,含水率從措施前的89.8%下降到措施后的79.8%,單井平均日產(chǎn)量從0.6t增加到1.14t。 本文取得的多輪次調(diào)驅(qū)技術(shù)研究成果,對元284區(qū)塊長6油藏提高采收率技術(shù)的現(xiàn)場應用具有一定的指導意義,并可對同類油藏調(diào)驅(qū)方案設計提供一定的借鑒作用。
[Abstract]:Chang6 reservoir in Yuan284 block of Changqing oilfield is an ultra-low permeability fractured reservoir with matrix permeability between 0.34-1.53mD and apparent fracture density of sandstone between 0.02-2.94 / m. In the process of water injection development, the single well production is low, the production decreases rapidly, the directivity of the well group is obvious, and after the deep profile control technology, the slope climbing pressure is low, the water cut of the well group is not obvious, and the field application effect is not ideal. In view of the current situation of block development, this paper studies the multi-cycle flooding technology suitable for this reservoir. The optimal selection and performance evaluation of multi-cycle control flooding system are carried out, and the injection parameters of multi-cycle modulation flooding system are optimized by numerical simulation technology and evaluated by core flow experiment. Two kinds of plane visualization models are made to discuss the mechanism of multi-cycle modulation flooding, and the scheme design of multi-round control drive for typical well groups is carried out, and the field application is carried out. In this paper, the following results have been obtained: (1) the control flooding system is a composite slug of pre-crosslinked particles and weak gels. The optimized weak gel formula is as follows: polymer HPAM concentration 1500mg/L crosslinking agent concentration 100mg/L modifier TJ concentration 100 mg / L gelation time 2-3 d gel strength controllable. The laboratory evaluation results show that the pre-crosslinked particles and the weak gel modified flooding system have good temperature resistance, salt resistance and the ability to improve the water absorption profile. The injection mode and slug size of the system were pre-mixed 0.15PV particles and then 0.3PV weak gel. (2) in the experiment of adjusting and flooding parameters optimization, in the middle water cut stage (40% -70%), the oil increasing effect of well group will be better, Under the promotion of subsequent water flooding, the injected weak gel continuously breaks through along the high permeability zone and is about to fail. When the next round of adjusting and flooding is started, the effect of adjusting and flooding is the best, and the best cycle is three rounds of modulation and flooding. (3) in the core flow experiment, the climbing pressure, the water absorption profile and the oil recovery are higher and more regular, and the oil recovery is higher in the multi-cycle modulation flooding than in the single modulation flooding, and the oil recovery is increased by 17.98%, the oil recovery is 17.98%, and the oil recovery is higher than that of the single modulation flooding, the water absorption profile is more uniform, and the displacement of the flooding agent is more regular. The oil recovery can be increased by 26.8%. (4) reducing the amount of single wheel control agent can improve the probability of plugging tiny fractures, improve the displacement path and expand the sweep efficiency. (5) the water cut of Yuan294-53 well group has been reduced from 89.8% before the measure to 79.8%, and the average daily output of single well has been increased from 0.6 t to 1.14 t. The research results obtained in this paper have a certain guiding significance for the field application of oil recovery enhancement technology in Chang6 reservoir of Yuan 284 block, and can be used for reference to the design of similar reservoirs.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357
本文編號：2322558
[Abstract]:Chang6 reservoir in Yuan284 block of Changqing oilfield is an ultra-low permeability fractured reservoir with matrix permeability between 0.34-1.53mD and apparent fracture density of sandstone between 0.02-2.94 / m. In the process of water injection development, the single well production is low, the production decreases rapidly, the directivity of the well group is obvious, and after the deep profile control technology, the slope climbing pressure is low, the water cut of the well group is not obvious, and the field application effect is not ideal. In view of the current situation of block development, this paper studies the multi-cycle flooding technology suitable for this reservoir. The optimal selection and performance evaluation of multi-cycle control flooding system are carried out, and the injection parameters of multi-cycle modulation flooding system are optimized by numerical simulation technology and evaluated by core flow experiment. Two kinds of plane visualization models are made to discuss the mechanism of multi-cycle modulation flooding, and the scheme design of multi-round control drive for typical well groups is carried out, and the field application is carried out. In this paper, the following results have been obtained: (1) the control flooding system is a composite slug of pre-crosslinked particles and weak gels. The optimized weak gel formula is as follows: polymer HPAM concentration 1500mg/L crosslinking agent concentration 100mg/L modifier TJ concentration 100 mg / L gelation time 2-3 d gel strength controllable. The laboratory evaluation results show that the pre-crosslinked particles and the weak gel modified flooding system have good temperature resistance, salt resistance and the ability to improve the water absorption profile. The injection mode and slug size of the system were pre-mixed 0.15PV particles and then 0.3PV weak gel. (2) in the experiment of adjusting and flooding parameters optimization, in the middle water cut stage (40% -70%), the oil increasing effect of well group will be better, Under the promotion of subsequent water flooding, the injected weak gel continuously breaks through along the high permeability zone and is about to fail. When the next round of adjusting and flooding is started, the effect of adjusting and flooding is the best, and the best cycle is three rounds of modulation and flooding. (3) in the core flow experiment, the climbing pressure, the water absorption profile and the oil recovery are higher and more regular, and the oil recovery is higher in the multi-cycle modulation flooding than in the single modulation flooding, and the oil recovery is increased by 17.98%, the oil recovery is 17.98%, and the oil recovery is higher than that of the single modulation flooding, the water absorption profile is more uniform, and the displacement of the flooding agent is more regular. The oil recovery can be increased by 26.8%. (4) reducing the amount of single wheel control agent can improve the probability of plugging tiny fractures, improve the displacement path and expand the sweep efficiency. (5) the water cut of Yuan294-53 well group has been reduced from 89.8% before the measure to 79.8%, and the average daily output of single well has been increased from 0.6 t to 1.14 t. The research results obtained in this paper have a certain guiding significance for the field application of oil recovery enhancement technology in Chang6 reservoir of Yuan 284 block, and can be used for reference to the design of similar reservoirs.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357
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