In order to reduce the failure accidents of conventional packers, a kind of sealing structure of retrievable packers is designed, which can provide reference for optimizing the sealing performance and pressure capacity of packers. And theoretical calculation and experimental research on their sealing performance and pressure capacity are carried out through the finite element analysis on the contact with large deformation based on Abaqus and experimental study. The results show that the upper packer is subjected to greater stress and mainly plays a sealing role in the sealing process. In order to improve the sealing performance of the packer, the height of the upper and lower packer should be preferentially selected about 60 mm, the height of the middle rubber cylinders should be about 50 mm, and the thickness of the packer should be about 21 mm. The newly designed rubber cylinders can meet 150°C. The newly designed rubber cylinders can meet the sealing function and pressure bearing function under the condition of 10,000 Psi and 150°C. The newly designed rubber cylinder can satisfy the function of sealing and pressure-bearing under 140°C and 10,000 Psi. The whole experiment shows that the capacity of bearing pressure and sealing is stable, which can better meet the requirements of field use.

/pdf/design-and-experimental-research-on-sealing-structure-for-a-6dfq31texx.pdf

Design and Experimental Research on Sealing Structure for a Retrievable Packer

Partial discharge performance improvement of covered conductor (CC)/high voltage insulator based electrical distribution systems

Continuous Preparation of Water-in-Heavy Oil Emulsion Without Emulsifier by Sic Membranes at High Temperature and its Micro-Explosion Performance

Thermogravimetric analysis of co-combustion of a bituminous coal and coffee industry by-products

Micro-explosion characteristics and mechanism of multi-component fuel droplet with high volatility differential

A new shift mechanism for micro-explosion of water-diesel emulsion droplets at different ambient temperatures

Insight into the chemical reaction process of coal during the spontaneous combustion latency

This paper reports experimental and analytical results of partial discharge degradation of silicone rubber sheets in accordance with proposed procedures. Considering the actual usage condition of silicone rubber as an insulating material of polymer insulators, an experimental procedure is established to evaluate long-term surface erosion caused only by partial discharge. Silicone rubber is subjected to partial discharge for 8 h using an electrode system with air gap. Voltage application is stopped for subsequent 16 h for recovery of hydrophobicity. The 24 h cycle is repeated 50 or 100 times. Deterioration of sample surface is evaluated in terms of contact angle and surface roughness. It is confirmed the proposed experimental procedure has advantage of no arc discharge occurrence, good repeatability of results, and possible acceleration of erosion. Surface erosion of silicone rubber progresses gradually and finally breakdown of silicone rubber occurs. Alumina trihydrate (ATH), an additive to avoid tracking and erosion by discharge, is not necessarily effective to prevent breakdown caused by partial discharge when localized electric field in air is enhanced by adding ATH. In such a situation, lower permittivity and higher resistance of silicone rubber seem dominant factors to prevent partial discharge breakdown and a careful insulation design should be required.

Hao Liu

Papers

A new shift mechanism for micro-explosion of water-diesel emulsion droplets at different ambient temperatures

Insight into the chemical reaction process of coal during the spontaneous combustion latency

Assessment of Surface Degradation of Silicone Rubber Caused by Partial Discharge

Combustion of biomass pyrolysis gas: Roles of radiation reabsorption and water content

Thermogravimetric analysis of co-combustion of a bituminous coal and coffee industry by-products