Experimental research on the sealing ability of borehole packers

Dorokhov, Maksym; Kostriba, I. V.; Biletsky, Volodymyr

doi:10.15587/1729-4061.2016.74831

Cited by 11 publications

(12 citation statements)

References 9 publications

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“…Substituting boundary conditions: u r0 ¼ 0; r 0 ¼ R 0 , into formula (10), contact pressure between the CPRT inner wall and oil-pipe is shown in formula (12a):…”

Section: Free Deformationmentioning

confidence: 99%

“…€ Ongu¨n et al 9 proposed a theory for calculating the Coulomb friction-fluid Reynolds pressure penetration of the rubber ring as a highly deformed dynamic seal, which was closely related to the interaction between the deformed seal structures. Dorokhov et al 10 and Hu et al 11 built an experimental bench, constitutive and friction tests of rubber materials were carried out, and the pressure penetration mechanism was verified. The results showed that the compression deformation and endurable pressure difference increase with the increase of axial loads.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new incremental calculated approach to predict maximum contact stress of compressed packer in large deformation

Peng

Kuang

Yang

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Compressed packer rubber is large deformation material, which endures biaxial contact friction between oil-pipe and casing-pipe in sitting and sealing process. Large-deformation theory analysis of rubber brings huge difficulties to solve, this is due to the material, geometry and contact non-linearity should be considered. In this article, the deformation of compressed packer rubber tube (CPRT) is divided into free deformation, unidirectional and bidirectional constrained deformations. Based on the theory of thick-wall-cylinder and the linear constitutive of rubber material segment, the CPRT mathematical model in different deformation processes is established and the influences of axial load, axial height of CPRT and contact friction coefficient of casing inner wall etc are considered. Based on incremental calculated approach, the mathematical model is solved. By comparing the results of the theoretical model with the results of finite element method and experimental results, it is found that the theoretical maximum contact stress is more conservative than the FEM and experimental solutions, so the sealing reliability of packer effectively predicted under the premise of allowable contact stress and the theoretical results can provide a lower limit reference value for the contact stress of the packer in the actual seal process. Meanwhile, the deviation of contact stress in FEM and theoretical value at z150 height of CPRT is among 1.13%∼4.90%, which can predict the contact stress in the compressed area near the stress concentration upper end-face of CPRT under the low friction factor, the results provide a reference for the compressed packer design.

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“…Substituting boundary conditions: u r0 ¼ 0; r 0 ¼ R 0 , into formula (10), contact pressure between the CPRT inner wall and oil-pipe is shown in formula (12a):…”

Section: Free Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new incremental calculated approach to predict maximum contact stress of compressed packer in large deformation

Peng

Kuang

Yang

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Similar to a casing, the packer is taken down the well to the target location. These rubbers swell when they come in contact with different types of fluids and are categorized accordingly as oil-based or water-based swelling elastomers (Dorohov et al 2016;Akhtar et al 2018a). When exposed to water or crude oil, the elastomer segment swells and completes the seal, before the commencement of production (Akhtar et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

Design and construction of test facility for evaluation of swell packers in cased and open holes

Pervez

Qamar

Akhtar

et al. 2021

J Petrol Explor Prod Technol

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In the petroleum industry, packers refer to the components/products which are used to isolate one section in a formation from others, or to isolate the outer section of a production tubing from the inner section, which may be a casing or a liner or the wellbore itself. Mechanical packers are installed through some form of tubing movement. Permanent packers are low in cost and provide better seal. Retrievable packers have lower sealing capability but are re-usable after repair, and therefore expensive. More innovative packers made of swellable elastomers are rather new. These elastomers swell when they come in contact with different types of fluids (mostly water and oil). Like a casing, these new packers are lowered to the desired depth and allowed to swell before production or injection operations begin. Various studies have been published about the swelling and mechanical response of these elastomers. However, many questions remain about the sealing performance of swell packers, and their effectiveness in actual wellbores of rough and random profiles. This paper describes the design and development of an experimental unit for performance testing of a mix of inert and swelling elastomer seals under realistic well conditions. Actual swell packers and petroleum tubulars are housed in a concrete block that replicates open-hole and cased-hole wells through layers of varying roughness. This is a one-of-its-kind unit providing full-scale demonstration about the working of swell packers against outer casing or rock formation in a wellbore. It is also a complete testing apparatus to investigate the behavior of swell packers made of fast-swell and medium-swell elastomers, and how they seal off irregular boreholes. This work can provide basic understanding and visual corroboration to petroleum engineers and students, swelling elastomer application developers, and academic and research personnel.

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“…Temperature and pressure can cause changes in the expansion rate of production tubing and packer leading to the development of tensile or compressive or no force conditions [6]. Till the innovative use of swellable elastomers, the most commonly used packers were the ones mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Experimental Setup for Swellable Elastomers in Cased and Open Holes

Qamar¹,

Akhtar²,

Pervez³

2021

Swelling Elastomers in Petroleum Drilling and Development - Applications, Performance Analysis, and Material Modeling

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A full scale experimental setup was designed and commissioned for testing of swelling elastomer seals against a casing (cased hole) and formation (open hole). Actual replicate of wellbore was designed with varying inside diameters and roughness to reproduce the effect of actual formation. The Dynaset packer mounted on a 7-inch tubular was allowed to swell against a 9–5/8-inch casing, while the fast swell packer mounted on a 9–5/8-inch tubular was allowed to swell against the 12–1/4-inch replicated well bore. This one-of-its-kind test setup can demonstrate the way the elastomers swell out and fill the asperities against smooth outer casing (cased hole) or against rough wellbore surface (open hole). Dismantling of the test setup midway through the testing scheme revealed a severely dimpled surface of the swelled elastomer.

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Experimental research on the sealing ability of borehole packers

Cited by 11 publications

References 9 publications

A new incremental calculated approach to predict maximum contact stress of compressed packer in large deformation

A new incremental calculated approach to predict maximum contact stress of compressed packer in large deformation

Design and construction of test facility for evaluation of swell packers in cased and open holes

Experimental Setup for Swellable Elastomers in Cased and Open Holes

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