A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells

Wang, Yang; Fan, Yu; Wang, Tianyu; Ye, Jiexiao; Luo, Zhifeng

doi:10.3390/gels8070449

Cited by 11 publications

(10 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, the most used materials are acrylamide, phenolic resin, and epoxy resin gel temporary plugging agents; however, these gels have the disadvantages of poor temperature resistance, high cost, and difficult‐to‐solve plugging after curing. Many scholars have solved these problems by exploring new polymer temporary plugging materials and adopting composite temporary plugging methods 14–18 …”

Section: Introductionmentioning

confidence: 99%

Establishment of temperature‐strength response prediction model of supramolecular gel temporary plugging agent by response surface method analysis

Lai,

Tian,

Wang

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this study, response surface methodology (RSM) was applied to optimize the preparation of a supramolecular gel temporary plugging agent. According to single‐factor experiments, results showed that the gelling temperature was preset at 100°C, and the gelling strength reached the maximum. Three‐factor RSM model prediction was carried out to explore the determination coefficient (R2) of the gelling temperature and strength and their degree of influence, and the predicted results were verified by experiments. No difference was found between the experimental results and the predicted results, indicating that this model could be used to optimize the preparation of DMF supramolecular gels. DSC, FT‐IR, XRD, and SEM were used to investigate the formation mechanism of the optimized supramolecular gel temporary plugging agent (CD‐Da), and its compatibility, stability, rheology, and plugging performance were evaluated. Experimental results showed that CD‐Da has the characteristics of good injectability in low‐permeability rock cores, strong plugging capacity, self‐breaking, and less damage to the formation. Therefore, this study not only provides a stable and efficient supramolecular gel plugging agent for tight oil and gas reservoirs, but also establishes a prediction model between each component and supramolecular gel, providing a new optimization method for the preparation of supramolecular gel.

show abstract

Section: Introductionmentioning

confidence: 99%

Establishment of temperature‐strength response prediction model of supramolecular gel temporary plugging agent by response surface method analysis

Lai,

Tian,

Wang

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Processes 2023, 11, 3002 2 of 12 temperature), and at high temperatures (120~150 • C), the acid production rate is fast, which cannot effectively delay the acid-rock reaction rate [3,4]. Moreover, the final released acid concentration is low, limiting its role in reservoir transformation [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Authigenic Acid Suitable for Acidification of Deep Oil and Gas Reservoirs at High Temperatures

Duan,

Chen,

2023

Processes

View full text Add to dashboard Cite

During the acid pressure conversion process in high-temperature, deep oil and gas reservoirs, a number of challenges are encountered that hinder the effectiveness of acid fracturing. These obstacles include significant corrosion of acidized pipe strings, rapid reaction rates of acid with rock, limited reach of acid liquids, and shallow penetration depth of active acids. Additionally, the transportation of highly corrosive acids presents safety risks, necessitating surface conditions that are free of acidity. However, underground conditions require strongly acidic liquids to meet enhanced ecological and environmental protection requirements. To address these limitations, experimental investigations have been conducted to examine the reaction rates of low-corrosive and low-acid rocks in alkaline systems involving halides and carbonyl compounds. Through meticulous assessments of reaction rates and dissociation effects in acid rocks, parameters have been successfully optimized to incorporate erythropoiesis and other compounding agents into acid-pressing designs. The experimental findings indicate that the concentration of released H⁺ ions after 60 min exceeded that of the conventional acid solution processed for 15 min. Enhanced dissolution was observed when erythropoietin content was increased to 20%. Furthermore, combining 10% acetic acid with 20% caustic acid resulted in a significant increase of 6.08% in the dissolution rate from 10 to 120 min, while exhibiting lower dissolution values compared with other types of acids. The development of naturally occurring acids with reduced rates of dissolution and acid–rock reaction holds significant potential for enhancing the efficacy of high-temperature, deep oil and gas reservoirs through acid fracturing stimulation.

show abstract

“…With the development of the global economy and society, the demand for oil and gas resources in various industries is increasing day by day [1][2][3]. At present, conventional oil and gas resources are becoming increasingly scarce, and the importance of unconventional oil and gas resources in the energy supply is becoming increasingly apparent.…”

Section: Introductionmentioning

confidence: 99%

A New Fracturing Method to Improve Stimulation Effect of Marl Tight Oil Reservoir in Sichuan Basin

Wang,

Fan,

et al. 2023

Processes

Self Cite

View full text Add to dashboard Cite

China’s argillaceous limestone reservoir has a lot of oil and gas resources, and hydraulic fracturing of the argillaceous limestone reservoir faces many difficulties. The first problem is that the heterogeneity of the argillaceous limestone reservoir is strong, and it is difficult to optimize fracturing parameters. The second problem is that there are a lot of natural fractures in the argillaceous limestone reservoir, which leads to a lot of fracturing fluid loss. The third problem is that the closure pressure of the argillaceous limestone reservoir is high, and the conductivity of fractures decreases rapidly under high closure pressure. The last problem is that the fracture shape of the argillaceous limestone reservoir is complex, and the law of proppant migration is unclear. The main research methods in this paper include reservoir numerical simulation, fluid-loss-reducer performance evaluation, flow conductivity tests and proppant migration visualization. To solve the above problems, this paper establishes the fracturing productivity prediction model of complex lithology reservoirs and defines the optimal hydraulic fracturing parameters of the argillous limestone reservoir in the Sichuan Basin. The 70/140 mesh ceramide was selected as the fluid loss additive after an evaluation of the sealing properties of different mesh ceramides. At the same time, the hydraulic fracture conductivity test is carried out in this paper, and it is confirmed that the fracture conductivity of 70/140 mesh and 40/70 mesh composite particle-size ceramics mixed according to the mass ratio of 5:5 is the highest. When the closure pressure is 40 MPa, the conductivity of a mixture of 70/140 mesh ceramic and 40/70 mesh ceramic is 35.6% higher than that of a mixture of 70/140 mesh ceramic and 30/50 mesh ceramic. The proppant migration visualization device is used to evaluate the morphology of the sand dike formed by the ceramsite, and it is clear that the shape of the sand dike is the best when the mass ratio of 70/140 mesh ceramsite and 40/70 mesh ceramsite is 6:4. The research results achieved a good stimulation effect in the SC1 well. The daily oil production of the SC1 well is 20 t, and the monitoring results of the wide-area electromagnetic method show that the fracturing fracture length of the SC1 well is up to 129 m.

show abstract

A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells

Cited by 11 publications

References 46 publications

Establishment of temperature‐strength response prediction model of supramolecular gel temporary plugging agent by response surface method analysis

Establishment of temperature‐strength response prediction model of supramolecular gel temporary plugging agent by response surface method analysis

Experimental Evaluation of Authigenic Acid Suitable for Acidification of Deep Oil and Gas Reservoirs at High Temperatures

A New Fracturing Method to Improve Stimulation Effect of Marl Tight Oil Reservoir in Sichuan Basin

Contact Info

Product

Resources

About