Combination packer performance profile
Nov 29,2024
Composite seal is one of the most important downhole tools in petroleum engineering. In order to improve the performance of the packer, the combined type consists of a pressed rubber tube and an expanded rubber tube.
In order to understand the sealing performance of the combined rubber pipe, the stress and contact pressure of the double expansion combined rubber pipe and the expansion and contraction combined rubber pipe were compared and analyzed by ABAQUS finite element software. The analysis results show that under the setting pressure of 15 mpa, the two rubber sleeves can effectively contact the rubber hose, and the contact pressure between the rubber sleeve and the inner wall of the rubber hose is greater than that of a single rubber sleeve, so the combination can really improve the sealing and sealing effect. Among them, the sealing pressure difference of expansion and pressure combination is the highest, which is 50% higher than that of single expansion. Double expansion under the rubber sleeve and expansion pressing expansion rubber sleeve should be properly strengthened and thickened to improve the working stress of the rubber sleeve.
The combination seal is one of the most important downhole tools in petroleum engineering, which is widely used in various production links of oil and gas exploration and development. It is located between the tubing and the hose or the hose and the open hole wall, and is used to seal the annular space between the tubing and the hose or the hose and the open hole wall. Among them, the sealing elements (rubber sleeves) made of non-metallic materials such as rubber are the most important devices, and there are two types of compressed rubber sleeves that rely on axial pressure to press the seal and expanded rubber sleeves that rely on radial pressure to expand the seal. With the development of petroleum engineering technology and the increase of working pressure, in order to improve the sealing and sealing performance, the combination of compression rubber sleeve and expansion rubber sleeve has appeared. The structure of the rubber sleeve must be reasonably designed and used within the limited pressure range, otherwise it will easily lead to damage and loss of seal accidents. Because the rubber sleeve is a nonlinear material, its theoretical research is difficult, so the finite element and other numerical analysis methods are often used to analyze its related mechanical properties. By fitting the experimental data with the superelastic constitutive model in ANSYS finite element analysis software, the constitutive model which can accurately describe the stress-strain relationship of the rubber sleeve is determined, and the axial contact pressure distribution is obtained. The finite element calculation model of the contact problem between the compression and expansion components is developed, and the distribution of the contact pressure is analyzed. The influence of working length, thickness, shoulder shape and wire cord arrangement on the stress and deformation of the expanding rubber sleeve was analyzed by finite element software. Taking the contact pressure and the volume of the rubber sleeve as the optimization objectives, the structural optimization design of the rubber sleeve was carried out by using the finite element method.
Whether it is double expansion combination sealing or expansion compression combination sealing, under the expansion setting pressure of 15 mpa, the two sealing cylinders can effectively contact the hose, and the contact pressure between the combination sealing cylinder and the inner wall of the hose is greater than that of a single sealing cylinder, so the combination can indeed improve the sealing and sealing effect. Among them, the sealing pressure difference of expansion and pressure combination seal is the highest, which is 50% higher than that of single expansion.
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