scholarly journals A Novel Micro-Nano Structure Profile Control Agent: Graphene Oxide Dispersion

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Zhong-Bin Ye ◽  
Yuan Xu ◽  
Hong Chen ◽  
Chen Cheng ◽  
Li-Juan Han ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Injection ◽  
Control Agent ◽  
Water Flooding ◽  
Sem Images ◽  
Nano Structure ◽  
Apparent Thickness ◽  
Profile Control ◽  
Potential Applications ◽  
Oilfield Water

Graphite oxide sheet, now referred to as graphene oxide (GO), is the product of chemical exfoliation of graphite and has been known for more than a century. A GO sheet is characterized by two abruptly different length scales; the apparent thickness of the functionalized carbon sheet is approximately 1 nm, but the lateral dimensions can range from a few nanometers to micrometers. In this paper, an improved method for the preparation of graphene oxide within a mild condition is described. We have found that cancelling the high-temperature stage and prolonging the reaction time of mid-temperature can improve the efficiency of oxidation process. We utilized FTIR, XRD, Ultraviolet-visible, TGA, Raman spectrum, and XPS measurements to characterize the successfully synthesized GO. SEM images were employed to reveal the interior microstructure of as-prepared GO dispersion. We also wondrously found that the GO dispersion could be used as profile control agent in the oilfield water-flooding. Flooding experiments showed that the GO dispersion has an ability to adjust water injection profile, reduce permeability ratio, and improve conformance factor. So the GO dispersion would have potential applications in oilfield exploitation.

A Streamline-Based Model of Wuliwan Oil Field Injecting Polymer Microspheres to Enhance Sweep Efficiency of Water Flooding

2011 ◽  
Vol 361-363 ◽  
pp. 451-455
Author(s):  
Zhao Qi Fan ◽  
Lin Song Cheng ◽  
Fu Dai ◽  
Jian Shen
Keyword(s):  
Water Injection ◽  
Field Tests ◽  
Control Agent ◽  
Oil Field ◽  
Water Flooding ◽  
Polymer Microspheres ◽  
Sweep Efficiency ◽  
Polymer Microsphere ◽  
Injection Wells ◽  
Profile Control

Polymer microsphere is a deep profile control agent which has been developed in recent years. Microsphere’s excellently elastic property makes it possible to be injected, or to penetrate deep into formation, and plug high permeable layers. Many laboratory investigations have been carried out on polymer microspheres by researchers, and field tests also have been done in some oilfields. The laboratory and field test results show that polymer microspheres can plug pore throats effectively, decrease permeability of high permeable channels, thus force injected water to change it’s direction and enhance water-flood sweep efficiency. In this paper, based on the mechanisms of profile modifying and plugging of polymer microsphere, Streamline models have been build abstractly to simulate the profile controlling progress of polymer microspheres, observe the transformation of streamline field, and analyze its impact on the pressure of water injection wells and performance of oil wells. In the end, the mechanisms of profile modifying and plugging of polymer microspheres have been interpreted based on the streamline field.

Pi Decision Technologys Application to Profile Control and Water Shutoff in Jiyuan Oilfield Luo27 Well Field Chang4+5 Reservoir

2013 ◽  
Vol 734-737 ◽  
pp. 393-396
Author(s):  
Meng Wang ◽  
Rui Hu ◽  
Yan Zou ◽  
Yu Jie Ma
Keyword(s):  
Water Flooding ◽  
Dynamic Adjustment ◽  
High Permeability ◽  
Water Utilization ◽  
Tight Reservoir ◽  
Profile Control ◽  
Fracture Development ◽  
Well Field ◽  
Oilfield Water ◽  
Water Cut

Jiyuan Oilfield Luo27 well field chang4+5 reservoir belongs to the typical three low" reservoir, which has tight reservoir, micro-fracture development and strong heterogeneity. After the water flooding development, there are many unusual phenomenons, such as profile absorbing water unevenly, injected water rushing in one direction seriously, block water cut rising rapidly, flooding wells increasing more. For that conventional dynamic adjustment and tracer monitoring are difficult to determine the inflow direction. In order to improve injected water utilization, Luo27 well field chang4+5 reservoir uses PI decision overall profile control technology to improve the injected water utilization, which effectively seals off the high permeability layer and eases the oilfield water cuts increasing speed and finally improves the water flooding recovery ratio.

scholarly journals Preparation and Evaluation of a Profile Control Agent Base on Waste Drilling Fluid

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoping Qin ◽  
Haiwei Lu ◽  
Yilin Li ◽  
Tong Peng ◽  
Lijie Xing ◽  
...  
Keyword(s):  
Raw Materials ◽  
Drilling Fluid ◽  
Water Injection ◽  
Salt Resistance ◽  
Control Agent ◽  
Injection Wells ◽  
Mild Conditions ◽  
Performance Indexes ◽  
Profile Control ◽  
Preparation And Evaluation

The waste drilling fluid was treated by a flocculant and a pH regulator. And a novel profile control agent base on waste drilling fluid (PCAWDF) was prepared using polymer, formaldehyde, resorcinol, and thiourea as raw materials under mild conditions. PCAWDF was characterized by infrared (IR) spectroscopy and scanning electron microscope (SEM). Compared with the profile control agent prepared by the recirculated water (PCARW), PCAWDF exhibited comparable or better stability, salt resistance, and viscoelasticity. The results of parallel core plugging experiments showed that the profile improvement capability of PCAWDF was stronger than that of PCARW (for 3000 mg/L: 84.6% versus 83.1%; for 5000 mg/L: 91.8% versus 90.2%). The main performance indexes of PCAWDF could meet the need of profile control for the water injection wells. The method could solve the problem of waste drilling fluid treatment in an economic and environmental way.

Novel Profile Control Treatment Using Pore-Scale Polymer Elastic Microspheres

2013 ◽  
Vol 716 ◽  
pp. 413-417 ◽  
Author(s):  
Lei Li ◽  
Xue Mei Gao ◽  
Guang Lun Lei ◽  
Xiao Dong Wei
Keyword(s):  
Aqueous Solution ◽  
Oil Recovery ◽  
Water Injection ◽  
Control Agent ◽  
Control Treatment ◽  
Pore Scale ◽  
Swelling Property ◽  
Profile Control ◽  
Heterogeneous Formation ◽  
Deep Profile

In order to solve the deep profile control problem and improve oil recovery of the oilfield, a novel profile control agent pore-scale polymer elastic microspheres (PSPEMs) was synthesized. The swelling property of PSPEMs in aqueous solution was analyzed. Core flow test and double-tube sand pack models were used for studying profile control and flooding performance of PSPEMs in oil formation. The results show that PSPEMs have good swelling property in aqueous solution with high salinity, high temperature and high pressure. Fig 5 and Fig 6 show that PSPEMs are better than polyacrylamide polymer on profile control. Table 1 indicates PSPEMs can improve water injection profile of heterogeneous formation effectively and plug the high permeable layer first. The higher the concentration of PSPEMs, the shorter the time it spends to realize profile control. The results also confirm that use proper concentration of PSPEMs, the profile control efficiency can increase enormously.

scholarly journals A Novel Nanodrag Reducer for Low Permeability Reservoir Water Flooding: Long-Chain Alkylamines Modified Graphene Oxide

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Hong Chen ◽  
Lin Xiao ◽  
Yuan Xu ◽  
Xiang Zeng ◽  
Zhong-Bin Ye
Keyword(s):  
Graphene Oxide ◽  
Water Injection ◽  
Injection Pressure ◽  
Water Flooding ◽  
Oxide Surface ◽  
Low Permeability ◽  
Reservoir Water ◽  
Water Contact ◽  
Low Permeability Reservoir ◽  
Modified Graphene Oxide

Chemical modification of graphene oxide (GO) by grafting hydrophobic chains on the surface has drawn much attention nowadays in the academic world, and it was suggested that modified GO could lead to new functionalized materials with specific structure and different properties. In this paper, modified GO (M-GO) were synthesized by chemically grafting alkylamines with varying chain lengths on the graphene oxide surface. Successful grafting of alkylamines was confirmed using Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and Raman spectroscopy measurements. In addition, we investigated the properties of M-GO as nanodrag reducer in low permeability reservoir water flooding. Water contact angle (CA) measurements revealed that the hydrophobic nature of GO depended on the chain length of the grafted alkylamines. And flooding experiments showed that the hexadecylamine- and octadecylamine-modified GO had an ability to reduce water injection pressure and improve water-phase permeability of the low permeability reservoirs during water flooding. So the M-GO would have potential applications in oilfield exploitation.

scholarly journals Experimental investigation on reservoir damage caused by clay minerals after water injection in low permeability sandstone reservoirs

2021 ◽  
Author(s):  
Yazhou Zhou ◽  
Wenbin Yang ◽  
Daiyin Yin
Keyword(s):  
Clay Mineral ◽  
Mineral Content ◽  
Water Injection ◽  
Damage Mechanism ◽  
Water Flooding ◽  
Formation Damage ◽  
Low Permeability ◽  
Sem Images ◽  
Porosity And Permeability ◽  
Sandstone Reservoirs

AbstractWater injection is an effective method for developing low permeability sandstone reservoirs. In the process of water flooding, reservoir damage can occur due to clay mineral content changes and it will significantly affect oil production. There are few investigations on the changes in clay mineral content and the degree of reservoir damage after injecting the water into low permeability sandstone reservoirs with different permeabilities and lithologies. In this study, low permeability natural cores from different lithological strata were collected from 4 wells in the Daqing sandstone reservoir, and clay mineral components and contents were measured through X-ray diffraction. Changes in the clay mineral content were determined after water injection. The reservoir damage mechanism by clay mineral migration was determined by analyzing scanning electron microscopy (SEM) images after water injection. Meanwhile, the porosity and permeability of the cores were tested after water injection, and the degree of reservoir damage in different lithological strata was determined. The clay mineral content ranges from 6.78 to 14.14% in low permeability sandstone cores and declines by 49.73% after water flooding. Illite, chlorite and illite/smectite mostly decrease, and kaolinite decreases the least. Due to the large particle size of kaolinite, kaolinite migration will block the pore-throats and cause formation damage after water flooding. In argillaceous siltstone and siltstone, kaolinite particles blocking pore-throats are very serious, and the permeability decreases greatly by 21.87–36.89% after water injection. With increasing permeability, the permeability decreases greatly after water injection. The findings of this study can help to better understand the mechanisms of formation damage after injecting water into low permeability sandstone reservoirs.

Research on Degradation of Flocculating Stemming Contained Polymer and Clay Used for Profile Control

2014 ◽  
Vol 912-914 ◽  
pp. 297-300
Author(s):  
Wei Zhang ◽  
Shuang Yan Zhang ◽  
Deng Feng Ju ◽  
Hai Jun Yan ◽  
Guo Qing Fu ◽  
...  
Keyword(s):  
Yellow River ◽  
Sol Gel ◽  
Water Injection ◽  
Injection Pressure ◽  
Control Agent ◽  
Oil Wells ◽  
Control Technique ◽  
Injection Wells ◽  
Fracture Pressure ◽  
Profile Control

Since Menggulin reservoir fully been developed in1990, profile control technique is widely used for improving water swept volume. After multiple rounds and large-scales of polymer flooding by materials mixed with sol-gel and Yellow River clay, the formation damage such as depth blockage and stemming become more and more serious.According to statistics, in 2012 there are respectively 10 and 11 water injection wells happened with back flow of profile control agent and wells pressure higher than fracture pressure that without injection. The original reservoir permeability is good, and individual well production has the capacity of 40 to 50m3/d. Yet recently several oil wells almost have fewer even no liquid output due to the blockage and stemming. Estimated by a typical well group,the speed of sol-gel drive increased from 10 m/year to 50~60 m/year, and average water injection pressure were up to 16MPa which almost double original pressure while the only 2MPa pressure corresponding to oil wells. Hence, it show that the severe depth blockage of the formation exactly exit in Menggulin reservoir.

Fractured Reservoir Blocking Dosage Calculation Method

2012 ◽  
Vol 268-270 ◽  
pp. 772-775
Author(s):  
Shuo Liang Wang ◽  
Yang Ming Liao ◽  
Huang Chang Xie
Keyword(s):  
Program Design ◽  
Water Injection ◽  
Blocking Agent ◽  
Water Flooding ◽  
Fluid Loss ◽  
Fractured Reservoir ◽  
Sweep Efficiency ◽  
Reservoir Properties ◽  
Dosage Calculation ◽  
Profile Control

Fractured reservoir development process are often faced with the angle wells flooded serious and side wells don’t get the effect of water injection. In order to increase the water flooding sweep efficiency. Profile control plugging is a measure that is frequently used. Traditional plugging program design does not take into account the fluid loss, Program design of the blocking agent dosage is always small, the result is not satisfactory. In this paper, the classic percolation theory is used, seepage equation of the fracture system and matrix system is established, the blocking agent Filtrate analytical solution that considers the different reservoir properties and different blocking agent performance is obtained, that can be used to guide the design of profile control water plugging program and can calculate the best blocking agent dosage. Through the actual implementation of the effect, the proposed method can be more substantial increase in the effect of plugging.

Investigation on Circulating Path of Injected Water for High Water-Cut Oilfield

2014 ◽  
Vol 1073-1076 ◽  
pp. 2201-2204
Author(s):  
Sui Ting Zhao ◽  
Qi Li ◽  
Xiao Ru He ◽  
Kao Ping Song ◽  
Ji Cheng Zhang
Keyword(s):  
Mathematical Model ◽  
Fuzzy Theory ◽  
Water Injection ◽  
High Water ◽  
Water Flooding ◽  
Profile Control ◽  
Production Wells ◽  
High Water Cut ◽  
Water Cut ◽  
Swept Volume

In this paper, the indexes have been determined for identifying ineffective injection-production circulation and corresponding mathematical model was constructed with fuzzy theory. Application examples show that this method is simple, fast and accurate. For high and extra-high water cut oilfields, because of the long-term erosion of injected water, there are some high penetrative channels between the injection and production wells, resulting in most injected water along the channel to cause the invalid injection and production, for which it is hard to increase water flooding swept volume, causing flooding and high water cut well and reducing oil production. To improve the effectiveness of water injection to achieve stable yields, it is important to take the measures of ineffective injection-production wells profile control, plugging and so on for fast and accurate identifying ineffective injection-production wells. To that end, this paper applied fuzzy theory to establishing the mathematical model for identifying ineffective injection-production wells.

A Fuzzy Method to Judge Water Passages with Ineffective Injection-Production for Heterogeneous Sandstone Reservoir

2012 ◽  
Vol 524-527 ◽  
pp. 1306-1309 ◽  
Author(s):  
Peng Xiao Sun
Keyword(s):  
Mathematical Model ◽  
Fuzzy Theory ◽  
Water Injection ◽  
High Water ◽  
Water Flooding ◽  
Profile Control ◽  
Production Wells ◽  
High Water Cut ◽  
Water Cut ◽  
Swept Volume

In this paper, the indexes have been determined for identifying ineffective injection production circulation and corresponding mathematical model was constructed with fuzzy theory. Application examples show that this method is simple, fast and accurate. For high and superhigh water cut oilfields, because of the long-term erosion of injected water, there are some high penetrative channels between the injection and production wells, resulting in most injected water along the channel to cause the invalid injection and production, for which it is hard to increase water flooding swept volume, causing flooding and high water cut well and reducing oil production. To improve the effectiveness of water injection to achieve stable yields, it is important to take the measures of ineffective injection-production wells profile control, plugging and so on for fast and accurate identifying ineffective injection-production wells. To that end, this paper applied fuzzy theory to establishing the mathematical model for identifying ineffective injection-production wells.

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