Down-hole isolation towards high-temperature reservoir using packing elements with swellable thermo-plastic vulcanizates

Zheng, Tong; Ye, Qinyou; Qian, Jie; Hao, Zhongxian; Wang, Linxiang

doi:10.1016/j.petrol.2018.09.003

Cited by 14 publications

(6 citation statements)

References 21 publications

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“…In recent years, much attention has been devoted to develop new series of TPVs to meet the needs of market requirement and broaden the application of TPVs, such as TPVs based on PA/isobutylene-isoprene rubber (IIR) blends as gas barrier materials [17,18], TPVs based on polyamide (PA)/EPDM blends for high temperature application [19,20], TPVs based on PP/nitrile-butadiene rubber (NBR) and PA/NBR blends as oil-resistance materials [21,22,23], TPV nanocomposites to improve their mechanical strength and dimensional stability or functionalized TPVs [6,24,25,26], etc..…”

Section: Introductionmentioning

confidence: 99%

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Yang

Guo

2019

Polymers

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As a special class of “green” elastomers, thermoplastic vulcanizates (TPVs) have been widely used in industries due to the combination of the excellent resilience of conventional elastomers and the easy recyclability of thermoplastics. Here, the morphology evolution of TPVs based on polyamide 6/ethylene-propylene-diene rubber (PA6/EPDM) blends was investigated by varying the content of the curing agent, phenolic resin (PF). With the incorporation of 6 wt% PF, the gel content of the EPDM phase reaches a high value of 49.6 wt% and a typical sea-island structure is formed with EPDM domain in a micro-nano size. The dynamic rheology behaviors of TPVs showed that with the curing degree of EPDM phase increasing, a denser network of EPDM particles is formed in PA6 matrix. Additionally, a lower crystal degree and crystal peak temperature are observed, indicating that there exists a growth restriction of PA6 crystal plate induced by a thinner plastic layer between the adjacent EPDM particles. However, the crystal form of PA6 is not changed with the increasing curing degree of the EPDM phase. This study provides an effective strategy to realize a new kind of TPVs, which can be easily introduced into industrial applications.

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Section: Introductionmentioning

confidence: 99%

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Yang

Guo

2019

Polymers

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“…The number and location of the packer also depend on engineering technology and well conditions. Bosnjak and colleagues [12][13][14][15] studied the use of expansion packers in the completion and fracturing of hightemperature oil deep wells or natural gas reservoirs and proposed a sealing scheme using expandable thermoplastic vulcanized elastomers. The multistage fracturing pipe with improved packers was deployed into horizontal openings, and the results showed that the new scheme exhibited high strength, heat resistance, and structural integrity in high-temperature environments compared to traditional packers.…”

Section: Introductionmentioning

confidence: 99%

Experimental and thermal‐structure coupling analysis for oil and water‐swellable packer

Huang

Liu

2023

Energy Science & Engineering

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It has been widely acknowledged that traditional packers will lose their elastic performance in the context of long periods of operation due to plastic deformation. This paper will introduce a swellable packer that can reduce the failure cases of production effectively. The deformation of the packer rubber in different media and temperatures has been analyzed. The pressure test of several packer rubber under different media is carried out in this paper. The reasonable expansion clearance between the rubber tube and the well wall is obtained by strength calculation to ensure the sealing reliability of the packer. Finally, the thermomechanical coupling calculation of the packer with different structural sizes is carried out. Experiments at different temperatures show that the higher saline concentration is associated with a lower expansion rate and a larger expansion rate in clear water. At the same time, the expansion of volume in clear water increases. In addition, the higher the external temperature is, the larger the temperature gradient is. When the temperature of the outer ring is between 100°C and 140°C, the internal temperature rises to 37°C under the thermomechanical coupling effect.

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“…With the continuous development of conventional oil and gas resources, oil fields are gradually explored and developed into deeper buried reservoirs, which usually have high temperature (higher than 120°C) 32–34 . For example, the reservoir temperature in the fourth area of Jidong Oilfield of PetroChina reaches 140 ~ 160°C 35 .…”

Section: Introductionmentioning

confidence: 99%

A gel system with long‐term high‐temperature stability for deep profile modification of high‐temperature oil and gas reservoirs

Tian,

Liu,

Liu

et al. 2023

J of Applied Polymer Sci

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Profile modification is the key for efficient development of oil and gas reservoirs, especially high‐temperature reservoirs, which requires the system to have good high‐temperature resistance. According to the characteristics of high‐temperature reservoir, a high temperature gel composed of terpolymer, modified phenolic resin, aromatic amine curing agent and thiourea was developed. The effects of different components on the properties of the gel system were clarified. Then, the long‐term thermal stability under high‐temperature conditions was studied. In addition, the plugging performance of gel system under different permeability and injection volume was studied. Finally, the gelation properties and plugging properties of gel system with the flow distance were studied by simulating the flow of porous media. The results show that the gel system has high strength and suitable gelation time, and it can be adjusted in real time according to different oilfield requirements. In the range of 75–150°C, the gel system had excellent long‐term stability. When the temperature was 75°C, no free water after 120 days, and the viscosity only decreased from 13,131 to 11,254 mPa·s. Even at 150°C, the viscosity was as high as 8350 mPa·s after 120 days, and the free water was only 5.5%. The gel system had good adhesion ability on the porous media surface and strong anti‐flooding properties. When the injection volume was 0.1 pore volume (PV in short), the plugging rate to the sand packed tube was 72.7%. When the injection volume was 0.5 PV, the plugging rate was as high as 97.6%. The plugging rate of the gel system for the sand packed tube with permeability of 500 mD was 98.7% when the injection volume was 0.5 PV. When the permeability increased to 3000 mD, the plugging rate still reached 92.3%. The gel system also had an excellent deep profile control ability, and the viscosity retention of at 60 cm was as high as 96%. When the flow distance was 2 m, the viscosity retention also reached 75%. The rheological properties also shown that the gel system had excellent shearing resistance and adsorption resistance. Finally, combined with the state of the gel system on the surface of the porous media, there was no cementation between the formation sand before the injection, and the sand particles did not stick to each other. After the gel was injected, the adhesion of gel system on the porous media surface was very strong. The 3D network structure was also very dense, the sand particles could have good cementation effect under the adhesion of gel system.

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Down-hole isolation towards high-temperature reservoir using packing elements with swellable thermo-plastic vulcanizates

Cited by 14 publications

References 21 publications

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Effect of Cross-Linking Degree of EPDM Phase on the Morphology Evolution and Crystallization Behavior of Thermoplastic Vulcanizates Based on Polyamide 6 (PA6)/Ethylene-Propylene-Diene Rubber (EPDM) Blends

Experimental and thermal‐structure coupling analysis for oil and water‐swellable packer

A gel system with long‐term high‐temperature stability for deep profile modification of high‐temperature oil and gas reservoirs

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