Design Methodology for Swellable Elastomer Packers for Well Construction Operations

Evers, Rutger; Koløy, Tom Rune; Abrahamsen, Terje

doi:10.2118/166499-ms

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…The ability of cellulose to absorb moisture well [14][15][16][17][18] allows for the use of lignocellulose raw materials as a filler in the creation of water-swelling polymer materials (PM), which have found application as sealing elements in building structures and sleeves for casing packers used in the oil and gas industry [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Influence of Partially Carboxylated Powdered Lignocellulose from Oat Straw on Technological and Strength Properties of Water-Swelling Rubber

Cherezova,

Karaseva,

Nakyp

et al. 2024

Polymers

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The work is aimed at the development of an energy-saving technique involving the partial carboxylation of powdered lignocellulose products from the straw of annual agricultural plants and the use of the obtained products in rubber compositions as a water-swelling filler. Lignocellulosе powder from oat straw (composition: ɑ-cellulose—77.0%, lignin—3.8%, resins and fats—1.8%) was used for carboxylation without preliminary separation into components. Microwave radiation was used to activate the carboxylation process. This reduced the reaction time by 2–3 times. The synthesized products were analyzed by IR spectroscopy, thermogravimetry and scanning electron microscopy. Industrial product sodium carboxymethylcellulose (Na-CMC) was used as a swelling filler for comparison. The swelling fillers were fractionated by the sieve method; particles with the size of 0–1 mm were used for filling rubber compounds. The amount of swelling filler was 150 parts per 100 parts of rubber (phr). Due to the high filling of rubber compounds, plasticizer Oxal T-92 was added to the composition of a number of samples to facilitate the processing and uniform distribution of ingredients. The rubber composition was prepared in two stages. In the first stage, ingredients without swelling filler were mixed with rubber on a laboratory two-roll mill to create a base rubber compound (BRC). In the second stage, the BRC was mixed with the swelling filler in a closed laboratory plasti-corder rubber mixer, the Brabender Plasti-Corder® Lab-Station. Vulcanization was carried out at 160 °C. For the obtained samples, the physical-mechanical and sorption properties were determined. It has been shown that the carboxylated powdered lignocellulose from oat straw increases the strength properties of rubber in comparison with Na-CMC. It has been shown that when the carboxylated powdered lignocellulose from oat straw is introduced into the rubber composition, the degree of rubber swelling in aqueous solutions of various mineralizations increases by 50 and 100% in comparison with a noncarboxylated lignocellulose.

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Section: Introductionmentioning

confidence: 99%

Influence of Partially Carboxylated Powdered Lignocellulose from Oat Straw on Technological and Strength Properties of Water-Swelling Rubber

Cherezova,

Karaseva,

Nakyp

et al. 2024

Polymers

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“…2008]. Swellable packers built with swellable elastomers offer advantages of interventionless operation, ease of deployment, adaptable for irregular wellbores, reduced rig time and costs [Evers, R., Koløy, T.R., and Abrahamsen, T. 2013].…”

Section: Introductionmentioning

confidence: 99%

Water-Swellable Elastomers for Heavy Brine Environments

Wang

Sadana

Mathur

2015

SPE Annual Technical Conference and Exhibition

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Swellable packers are widely used to create annular seals between production casing and an open hole. The popularity of swell packers is due to their ease of deployment and streamlined design, which does not have moving parts to malfunction. The current water swell packer technology meets the swelling requirement in light monovalent brines, however, falls short of swelling requirements in heavy brines and especially divalent brines like CaCl 2 and CaBr 2 . This work/paper presents the development of new swellable elastomers that exhibit superior swelling in divalent brines and enhanced mechanical properties compared to existing swellable compounds.New swellable elastomers are made by blending newly developed swellable nanocomposite microgels with nitrile butadiene rubber (NBR). Nanocomposite microgels possess a unique polymer/nano-clay network structure in which nano-clay acts as a multifunctional cross-linker and leads to the formation of higher molecular weight polymer chains. As a result of the unique structure, the nanocomposite microgels exhibit better elastomeric behavior, higher swelling ratio and faster swelling kinetics compared to the conventional super absorbent polymer (SAP). The nanocomposite microgels were synthesized through the reverse-phase suspension polymerization method to achieve a gel particle size of less than 10 m, which is essential for the fast swelling rate of the compound. A divalent brine-tolerant 2-acrylamido-2methylpropane sulfonic acid (AMPS) monomer was selected for the synthesis to achieve divalent brine-swelling capability.The new swellable elastomers exhibit a 100% volume increase within three days in 10% CaCl 2 at 200°F , and a final volume swell of more than 200% for a 1-in. button sample. This volume swell of the button sample is four times higher than the current water swellable elastomers. The new swellable elastomers also exhibit better mechanical properties than current swellable compounds.Newly developed swellable elastomers made by incorporating novel nanocomposite microgels in the base polymers offer swellable packers for heavy brine environments.

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The Hybrid Completion and Stimulation Technology Combining Sleeves with Bridge Plugs: A Case History in Ordos Basin, China

Zheng

Wei

et al. 2018

SPE Asia Pacific Oil and Gas Conference and Exhibition

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Operator planned to develop the new low-permeable sandstone gas reservoir below the mature gas layer in Ordos basin. In terms of cost reduction the wellbore was designed to pass through the undeveloped resource locating in the upper mature reservoir to obtain dual-zone commingled production. According to the well logging, there was the indication of hole collapse, enlargement and an unforseen water bearing zone found in the deviated section locating in upper zone. Packers could fail in the irregular deviated wellbore. Upon the modification of completion solution, the 4 1/2in open-hole packer-sleeve (OHPS) completion and fracturing system was deployed to treat the lower target zone. Top cementing operation using novel stage collar with swellable elements was performed to isolate the upper mature zone. "Plug and Perf" (PnP) via compact bridge plugs was carried out to enable efficient fracturing in deviated wellbore. The single-trip OHPS system employed water-swellable packers (WSPs) with corrugated packing element. The WSP and compact bridge plug were successfully evaluated by bench test. In one gas well, the operator performed cementing job and the stage collar was opened by wiper plug once the tripping of the OHPS completion with five packers was made successfully. Three bridge plugs were pumped down to the target depth. Hydraulic fracturing operation was sequentially made with all packers and bridge plugs effectively set. It is shown from the field operation that the hybrid completion is able to meet the requirements of completion and stimulation in irregular wellbore with abnormal conditions for tight reservoirs.

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Design Methodology for Swellable Elastomer Packers for Well Construction Operations

Cited by 4 publications

References 3 publications

Influence of Partially Carboxylated Powdered Lignocellulose from Oat Straw on Technological and Strength Properties of Water-Swelling Rubber

Influence of Partially Carboxylated Powdered Lignocellulose from Oat Straw on Technological and Strength Properties of Water-Swelling Rubber

Water-Swellable Elastomers for Heavy Brine Environments

The Hybrid Completion and Stimulation Technology Combining Sleeves with Bridge Plugs: A Case History in Ordos Basin, China

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