The New Development of Amphiphilic Polymer Profile Control Agent in High Temperature and High Salinity Reservoirs

2019 ◽  
Author(s):  
Hongbin Yang ◽  
Wanli Kang ◽  
Hongwen Zhang ◽  
Bobo Zhou ◽  
Xinxin Li ◽  
...  
Keyword(s):  
High Temperature ◽  
High Salinity ◽  
Control Agent ◽  
Amphiphilic Polymer ◽  
Profile Control ◽  
New Development

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.

Successful Field Application of Delayed Water-Swelling, Flexible Gel Particles for In-Depth Waterflood Conformance Improvement in Wide Spacing of Wells with High Temperature and High Salinity

2021 ◽  
Author(s):  
Fayang Jin ◽  
Qihang Li ◽  
Yong Liu ◽  
Wanfen Pu ◽  
Chengdong Yuan ◽  
...  
Keyword(s):  
High Temperature ◽  
High Salinity ◽  
Production Performance ◽  
Wide Spacing ◽  
Gel Particles ◽  
Well Spacing ◽  
Profile Control ◽  
Reservoir Conditions ◽  
Water Swelling

Abstract The HD Oilfield, operated by PetroChina, is located in Tarim Basin. It is characterized by high temperature (112 ℃) and high salinity (291000 mg/L), and developed by wide spacing of wells (average 700 m). High vertical and areal heterogeneity lead to early water breakthrough and a poor water sweep efficiency. Effective conformance control is urgently needed, but harsh reservoir conditions, wide well spacing, and discontinuous interlayers pose great challenges for conformance treatments in this field. Because of wide well spacing and discontinuous interlayers, water channeling and crossflow in in-depth part of reservoir could still occur after conformance treatment. To prevent this, in-depth conformance improvement treatments with injecting large volumes of low-cost profile control agents were proposed. To achieve this goal, we designed delayed water-swelling, flexible gel particles that have high deformability and elasticity. Simultaneously, to meet the harsh reservoir conditions, gel particles were designed to have long-term tolerance to high temperature and high salinity. The first treatment was implemented in May 2016, and the total incremental oil by June 2019 was 17347 tons. The treatment validity is more than 36 months, and it keeps being effective. Until now, 9 treatments have been finished. The total incremental oil is 102100 tons until May 2020, and the increment is still going on. The input-output ratio for these 9 treatments is about 8.45, which indicates the treatments were an economic and technical success. In this paper, first we describe the design of gel particles and their properties evaluation by extensive experiments, including water-swelling ability, long-term tolerance to high temperature and high salinity, elasticity, tenacity, injectivity, selectivity, plugging ability, and scouring resistance, etc. Then, we present operation design and control in the field, which is especially important for the success of these treatments. Furthermore, according to production performance as well as the wellhead pressure drop curve, pressure curve of water injection, and water injectivity in injection well, treatment results are discussed in detail to evaluate if the treatment is successful or not. Finally, several important experiences with respect to how to do operation design and field control are summarized. This paper documents a successful case history of in-depth waterflood conformance improvement in wide spacing of wells. These successful field cases together with summarized experience will provide a detailed guide and an updated framework for conformance improvement treatment for operators. In addition, this paper presents an alternative agent, i.e., delayed water-swelling, flexible gel particles, for in-depth waterflood conformance improvement in high temperature and high salinity reservoirs.

Performance Evaluation for High Temperature Blocking Agent of Tannin Foam System

2012 ◽  
Vol 524-527 ◽  
pp. 1518-1525
Author(s):  
Song Yan Li ◽  
Zhao Min Li
Keyword(s):  
High Temperature ◽  
Temperature Profile ◽  
Blocking Agent ◽  
Control Agent ◽  
Interference Phenomenon ◽  
Cyclic Steam Stimulation ◽  
Profile Control ◽  
New Type ◽  
System Selection ◽  
Steam Stimulation

Cyclic steam stimulation is a kind of recover method for heavy oil. Along with steam stimulation cycles increased, steam channeling interference phenomenon will appear. To solve the problem, one of the most effective methods is high temperature profile control technology. In this paper, a new type of high temperature plugging agent of tannin foam system was researched, and the influencing factors on it were analyzed. Through foam system selection and static evaluation high temperature profile control agent of tannin foam system has been selected. The formula is: foaming agent DHG-1 for 0.5%, tannin for 7.5%, formaldehyde for 4.0%, phenol for 1.0%, CaCl2 for 1000ppm. The tannin foam system can be used in steam stimulation well.

Development and Evaluation of Salt-Resisting Polymer Gel Profile Control Agent

2013 ◽  
Vol 781-784 ◽  
pp. 426-430 ◽  
Author(s):  
Guang Yang ◽  
Jian Zhang ◽  
Xin Sheng Xue ◽  
Ying Xian Cui ◽  
Wen Sen Zhao
Keyword(s):  
High Temperature ◽  
Storage Modulus ◽  
Water Erosion ◽  
Control Agent ◽  
Polymer Gel ◽  
Laboratory Findings ◽  
Water Shutoff ◽  
Profile Control ◽  
Weak Gel

Be aimed at the characteristics of high temperature-salinity and severe heterogeneity of Bohai oilfield. This paper studies three different strength kinds of polymer gel profile control agents. Use storage modulus evaluates strength of polymer gel. the result indicate that the storage modulus of weak gel is between0.1 Pa and 1.0 Pa, the storage modulus of moderate gel is between1.0 Pa and 3.1 Pa, the maximal value of powerful gels storage modulus is11.9 Pa during 90 days. Core laboratory findings indicate that these different strength kinds of polymer gel have well formation sealing quality and endure washing out quality,40PV by water erosion , the formation sealing rate is up 90%.the experiment result of water shutoff and flooding oil indicate that the EOR is13.44% in heterogeneity core.

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