Preparation and degradable mechanism of self-breaking gel valve for underbalanced drilling

Ji, Renjing; Yu, Xiaorong; Yang, Huan; Wang, Xiying; Su, Gaoshen

doi:10.1016/j.geoen.2024.212705

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…At present, the water injection development mode has been generally adopted by oilfields both at home and abroad. With the deepening of development, a large number of pressurized water injection wells need string inspection and workover operations every year, and the operation demand is huge. − The traditional well-killing method uses well control fluid, which suffers from many defects including the possible pollution of the formation by the fluid, the lowering of the permeability of the reservoir, etc., and the well-killing fluid operation is exposed to great risks. ,, …”

Section: Introductionmentioning

confidence: 99%

“…1−3 The traditional well-killing method uses well control fluid, which suffers from many defects including the possible pollution of the formation by the fluid, the lowering of the permeability of the reservoir, etc., and the well-killing fluid operation is exposed to great risks. 1,4,5 Since the Tuha Engineering Institute proposed the gel plugging technology under pressure in 2007, many scholars have carried out research on this technology, and the feasibility of this technology has been verified through field experiments. 6−9 With the rise of polymer chemistry, polymer gel technology has achieved long-term development, giving birth to hydrogel materials with good pregelling rheological properties, characterized by easy injection, postgelling deformability, and adjustable plugging strength.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Performance Study of Self-Degradable Gel Plugging Agents Suitable for Medium- and Low-Temperature Reservoirs

Zou,

Wang,

et al. 2024

ACS Omega

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Aiming at the problems of current similar hydrogel plugging agents, such as poor breaking performance, nonspontaneous degradation, and reservoir pollution which have been plaguing their application in temporary plugging operations, this study has synthesized a cross-linking agent for hydrogels with dimethylaminoethyl acrylate and dibromo-p-xylene as raw materials. With Fourier transform infrared, 1 H nuclear magnetic resonance, and thermogravimetric analyses as representations of the structure and thermal stability of the crosslinking agent, a set of self-degrading hydrogel systems has been developed with the cross-linking agent as the core so as to make evaluations on the temperature resistance, plugging performance, and core damage performance of the hydrogel and conduct a study on its gelation kinetics. The research results show that the cross-linking agent shows good thermal stability. When applied in the hydrogel system, the hydrogel has shown high temperature resistance, maintaining gel strength for 5−10 days at 50−90 °C, with viscosity after complete degradation lower than 10 mPa•s. The excellent bearing strength of the hydrogel system has led to a core damage rate below 5%. The study on gelation kinetics of the hydrogel system shows that, with the increase in the concentration of the cross-linking agent, the gelation time of the hydrogel system is shortened, with the reaction order between the cross-linker concentration and the gelation time at about 0.6 under the condition of 50−90 °C.

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