Preparation and Application of J-F Profile Control Agent

2014 ◽  
Vol 962-965 ◽  
pp. 727-730
Author(s):  
Zhan Shuang Xu
Keyword(s):  
Ph Value ◽  
Injection Pressure ◽  
Binary Compound ◽  
Salt Resistance ◽  
Temperature Tolerance ◽  
Economic Benefits ◽  
Control Agent ◽  
Utilization Rate ◽  
Profile Control ◽  
Liaohe Oilfield

In Liaohe oilfield Xing 28 block before and during the alkali/polymer binary compound flooding process, there are heterogeneity contradictions on vertical and plane formation. In order to solve this contradiction, improve the utilization rate of oil displacement agent, J - F profile control agent was developed successfully, the profile control agent is not restricted by formation pH value and gel time, of good resistance to flushing, temperature tolerance and salt resistance. Through the field test, using J-F profile control agent the injection profile changed significantly and the injection pressure increased, a remarkable economic benefits and social benefits are gained.

The Preparation and Characterization of AM/2-EHA/VTEOS Copolymer as Profile Control Agent

2012 ◽  
Vol 602-604 ◽  
pp. 732-738
Author(s):  
Ming Tian ◽  
Yong Jun Xu
Keyword(s):  
Oil Recovery ◽  
Thermo Gravimetric Analysis ◽  
Salt Resistance ◽  
Temperature Tolerance ◽  
Control Agent ◽  
Structure Characterization ◽  
Gravimetric Analysis ◽  
Free Radical Copolymerization ◽  
Good Thermal Stability ◽  
Profile Control

In order to enhance oil recovery and avoid the profile control agents degradation in the alkali/surfactant/polymer composite solution in the oil layer, the copolymer of AM (basic monomer), 2-EHA (salt resistance monomer with large lateral group) and VTEOS(temperature tolerance monomer) was prepared by free radical copolymerization method as the profile control agent. FT-IR and 1H-NMR were used for the structure characterization. Thermo gravimetric analysis, Core/Sand pack experiments and water drive displacement tests of copolymer particles were used to evaluate the properties. The results shows that the copolymer particles have good thermal stability, alkaline resistance, anti-salt property and excellent blocking property as profile control agent.

Improvement Research of Organic Phenolic Gel being Used to be an Organic Deep Profile Control Agent

2014 ◽  
Vol 908 ◽  
pp. 46-50
Author(s):  
Yu Li Liu ◽  
Yi Qin
Keyword(s):  
Crosslinking Agent ◽  
Gelation Time ◽  
High Water ◽  
Salt Resistance ◽  
Control Agent ◽  
Water Soluble ◽  
Water Control ◽  
Profile Control ◽  
Weak Gel ◽  
Deep Profile

Organic phenolic gel is commonly used to be a deep profile control agent which applies to use in the high water cut oilfields where heterogeneity is severe, improve the contradiction of inter-reservoir layer and inner layer, expand water sweeping zone, and achieve the purpose of stable oil production and water control. Organic phenolic weak gel is mainly affected by the concentration of each component and reaction temperature. In this paper, formaldehyde was replaced by urotropin, which is not only delaying the gelation time, but also avoiding pollution. In addition, a water-soluble phenolic resin oligomer has been synthesized by the method of two-step alkali catalysis with appropriate mole ratio as an auxiliary crosslinking agent. Considering the concentration of each reactant as the factor, the orthogonal experiments have been designed to optimize the traditional organic HPAM-phenolic weak gel. We have found that the optimized weak gel has a better stability, longer gelation time, better salt resistance and environment friendly. It can better meet the needs of oilfield deep profile control.

scholarly journals Development and Performance Evaluation of Steam Channeling Plugging Agent of Thermal Oil Recovery

2015 ◽  
Vol 8 (1) ◽  
pp. 58-63
Author(s):  
Wang Chunsheng ◽  
Sun Yingfan ◽  
He Chenglin ◽  
Zhang Haipeng ◽  
Du Qiuying
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Oil Recovery ◽  
Ph Value ◽  
Control Agent ◽  
Formation Condition ◽  
Cross Linking ◽  
Profile Control ◽  
High Efficient ◽  
And Performance

Under the constraints of high temperature and heterogeneity, the common profile control agent can not effectively plug the steam channeling. To address this issue, it is necessary to develop the high temperature resistance steam channeling plugging agent to improve the steam suction profile in the heavy oil reservoir. This paper used Simple Variable Method to optimize the content of the components of the high temperature resistant plugging agent. Static performances evaluation aims to study the influence rules of the formation condition (temperature, salinity and pH value). Dynamic evaluation is used to study its performance (plugging ratio, residual resistance factor, scouring resistance and thermal stability) in the sand-filled pipe to testify its applicability. The ratio of the component and the injection sequence are shown as follows: 0.03% coagulant +2.2% cross-linking agent I + 1.2% cross-linking II + 6% high efficient main agent. The evaluation experiment results show that the gel can resist at least 280ºC, the plugging ratio is above 93.1%. The plugging ratio only have a 8.43% reduction after scoured by 15 PV steam (280ºC). After a 10-day thermal stability experiment (280 ºC), the plugging ratio is still above 80%. The result indicated that the plugging agent is suitable for the improvement of steam suction profile. The suggested way of injection is also provided.

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.

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.

A Design Model of Technological Parameter for Multi-Layer Reservoir Profile Control

2013 ◽  
Vol 734-737 ◽  
pp. 1328-1337
Author(s):  
An Gang Zhang ◽  
Zi Fei Fan ◽  
Heng Song ◽  
Jiang Yuan Yao
Keyword(s):  
Injection Pressure ◽  
Control Agent ◽  
Time Step ◽  
Injection Process ◽  
Injection Parameters ◽  
Profile Control ◽  
Pressure Equilibrium ◽  
Target Layer ◽  
Injection Mechanism ◽  
Control Layer

Following the criterion of zero pollution for non-target layer, an optimization model for multi-layer reservoir profile control was established by reservoir engineering method. Combining the selective injection mechanism of profile control agent, the whole injection process of profile control agent was simulated by the iteration calculation method of time step splitting. Firstly, the activated range of profile control layer was judged by means of threshold pressure of each formation; secondly, the flow rate of profile control agent was distributed by the water absorption index of each layer; finally, the wellhead injection pressure was calculated base on the pressure equilibrium mechanism. The model not only can be used to optimize the injection displacement and total injection volume of profile control, but also to predict the grading pressure during the process of profile control. In addition, the sensitivity of parameters in this model was analyzed, such as injection displacement, viscosity and resistance factor. Ultimately, the optimal design of injection parameters of profile control for an actual well group was put into practice.

MFR High Temperature Profile Control Agent Experimental Evaluation

2012 ◽  
Vol 602-604 ◽  
pp. 1250-1254
Author(s):  
Zhen Zhong Fan ◽  
Li Feng Zhang ◽  
Qing Wang Liu
Keyword(s):  
High Temperature ◽  
Temperature Profile ◽  
Gelation Time ◽  
Salt Resistance ◽  
Control Agent ◽  
Heating Time ◽  
The Core ◽  
Profile Control ◽  
Stable Performance ◽  
Breakthrough Pressure

MFR high temperature profile control agent consisted of 6.5% wood Fortunately sulfonic acid calcium (Ca-LS) and 6.5% crosslinker modified furfural resin (MFR),and the gel solution formed a stable performance gel in the 150~300°C.The higher the temperature, the shorter the gelation time; and the longer the heating time, the higher the gel strength. The gel is very stable at 300°C, and is well in acid and salt resistance. The core experiments showed that the blocking agent's blockage ratio is more than 99% ; the units of the breakthrough pressure was greater than 100 kPa / cm,which the gel solution is a good performance of high-temperature profile control agent.

scholarly journals Experiment and Analysis of Wedge Cutting Angle on Cutting Effect

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Deqiang Yang ◽  
Xuguang Wang ◽  
Yinjun Wang ◽  
Huaming An ◽  
Zhen Lei
Keyword(s):  
Construction Cost ◽  
Economic Benefits ◽  
Tunneling Rate ◽  
Vibration Velocity ◽  
Utilization Rate ◽  
Engineering Practice ◽  
Blasting Vibration ◽  
Cutting Depth ◽  
Vertical Side ◽  
Cutting Angle

In the process of tunnel excavation, large charge wedge cutting blasting is widely used to improve the effect of cut blasting and speed up the excavation rate, which is tantamount to increasing the construction cost. In order to save economic cost and improve cutting blasting effect, wedge cutting models with five different cutting angles were experimented and studied by using concrete materials on the basis of similarity theory analysis. The relationships among cutting depth, blasting volume, blasting fragment, and cutting angle are studied and deduced by the dimensional analysis method. The polynomial fitting of cutting depth, blasting volume, blasting fragment, and cutting angle is carried out according to the experimental data, and the corresponding fitting formula is obtained. The optimum cutting depth, hole utilization rate, blasting volume, and blasting fragment were obtained when the wedge cutting angle was 67° under the same charge. The values were 1.665 × 10−1 m, 92.5%, 8.390 × 10−3 m3, and 49.07 mm, respectively. With the use of TC4850N type blasting vibration meter, the blasting vibrations on the wedge in four directions are tested and analyzed. The results show that when wedge cutting inclination is 65 degrees, the peak vibration velocity is the minimum and the vibration intensity of the wedge cutting inclined side is generally smaller than that of the vertical side. Considering the cutting depth, blasting volume, blasting fragment, blasting vibration hazard, drilling error, tunneling construction cost, and other factors, the 65°∼69° wedge cutting blasting in engineering practice can improve the blasting tunneling rate and increase economic benefits. The experimental results show that the blasting tunneling rate is increased and the economic benefit is increased with the minimum construction tunneling cost, which has certain engineering significance.

Effect of Dissolved Oxygen Content on Gelling Strength of Chromium Gel in Block Hai 1

2014 ◽  
Vol 1008-1009 ◽  
pp. 243-246
Author(s):  
Peng Fei Yuan ◽  
Guang Sheng Cao ◽  
Xiao Ma ◽  
Xiao Ping Wang ◽  
Xin Tian
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Good Effect ◽  
Factors Affecting ◽  
Profile Control ◽  
Liaohe Oilfield ◽  
Weak Gel ◽  
Main Factors ◽  
Implementation Effect ◽  
Gelling Time

Jinma company of Liaohe oilfield has carried out weak gel flooding in-depth in block Hai1 and achieved good effect. But in the process of profile and flooding, problems of gelation fluctuating and gelling rate declining seriously affected the implementation effect of the profile control and flooding project. It is researched that one of main factors affecting gelling effect of profile and flooding system is the dissolved oxygen. Aiming at this problem, this paper studies critical value affecting gelling in combination with the actual situation of polymer displacement in block Hai 1. The experimental results show that, content of dissolved oxygen affects both gelling strength and gelling time of weak gel in the way that when dissolved oxygen content is between 0mg/L and 3mg/L, low gelling strength and long gelling time are obtained, while in the range of 4mg/L-10mg/L, gelling effect is good. Two critical values are respective 1.5mg/L and 7mg/L.

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