Synthesis and Plugging Performance of Poly (MMA-BA-ST) as a Plugging Agent in Oil-Based Drilling Fluid

Yang, Jian; Lei, Zhen; Dong, Bin; Ai, Zhongqiang; Lin, Pei; Xie, Gang

doi:10.3390/en15207626

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…The integrity of the molecular chain remains unaffected. The initial decomposition temperature of SAANM is determined to be 296 °C based on the intersection point of the tangent at the TG step and the tangent at the curve inflection point [53]. In addition, the peak value of the DTG curve indicates that SAANM experiences the fastest decomposition rate at a temperature of 411 °C [54].…”

Section: Thermogravimetric Analyses (Tga)mentioning

confidence: 99%

Study of a novel cross linked graft copolymer starch in water-based drilling fluid

You

Hou

et al. 2023

Mater. Res. Express

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In the drilling industry, the demand for environmentally friendly additives with high thermal stability is increasing due to the dual factors of increasing environmental pressure and high-temperature oil layers. However, commonly used non-toxic and biodegradable additives, such as etherified modified starch, cannot withstand temperatures higher than 150 °C. Additionally, natural polymers with better thermal stability obtained through graft modification with sulfonated monomers face challenges in meeting the standards of toxicity and biodegradability. To address these technical problems, a novel graft and crosslink copolymer, St-AA/AM/NVP/MBA (SAANM), was synthesized from corn starch by combining graft modification with a non-sulfonated monomer and cross-linking modification. Laboratory evaluation results confirm that the thermal stability of SAANM in a nitrogen atmosphere was close to 300 ℃, and it exhibits excellent temperature resistance up to 170 °C in bentonite-based mud, while also retaining the non-toxic and biodegradable characteristics of starch. The water-based drilling fluid (WBDF), added with SAANM, demonstrated outstanding rheological properties, fluid loss control performance, and environmental friendliness after aging at 170 °C and being polluted by high concentrations of NaCl or CaCl2. The successful application of SAANM in a high-temperature directional well in an offshore oil field confirms its potential for borehole cleaning and wellbore stability.

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Section: Thermogravimetric Analyses (Tga)mentioning

confidence: 99%

Study of a novel cross linked graft copolymer starch in water-based drilling fluid

You

Hou

et al. 2023

Mater. Res. Express

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“…In comparison with conventional Polyacrylamide gel plugging agents of the same type [40][41][42][43][44], DPGs exhibit superior plugging efficiency and still retain a certain plugging ability at a distance from the injection well. The cost-effectiveness analysis suggests that DPGs hold considerable potential for practical applications.…”

Section: Formula Of Bulk Gelsmentioning

confidence: 99%

Probing the Effect of Young’s Modulus on the Reservoir Regulation Abilities of Dispersed Particle Gels

Wang,

Zhu,

Jiang

et al. 2023

Gels

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The mechanical strength of dispersed particle gels (DPGs), which can be directly characterized by Young’s modulus, is an important parameter affecting reservoir regulation performance. However, the effect of reservoir conditions on the mechanical strength of DPGs, as well as the desired range of mechanical strength for optimum reservoir regulation performance, have not been systematically studied. In this paper, DPG particles with different Young’s moduli were prepared and their corresponding migration performances, profile control capacities and enhanced oil recovery abilities were studied by simulated core experiments. The results showed that with increase in Young’s modulus, the DPG particles exhibited improved performance in profile control as well as enhanced oil recovery. However, only the DPG particles with a modulus range of 0.19–0.762 kPa could achieve both adequate blockage in large pore throats and migration to deep reservoirs through deformation. Considering the material costs, applying DPG particles with moduli within the range of 0.19–0.297 kPa (polymer concentration: 0.25–0.4%; cross-linker concentration: 0.7–0.9%) would ensure optimum reservoir control performance. Direct evidence for the temperature and salt resistance of DPG particles was also obtained. When aged in reservoir conditions below 100 °C and at a salinity of 10 × 104 mg·L−1, the Young’s modulus values of the DPG particle systems increased moderately with temperature or salinity, indicating a favorable impact of reservoir conditions on the reservoir regulation abilities of DPG particles. The studies in this paper indicated that the practical reservoir regulation performances of DPGs can be improved by adjusting the mechanical strength, providing basic theoretical guidance for the application of DPGs in efficient oilfield development.

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“…During the completion phase, they can cause difficulties in filter cake removal ( Figure 1 ) [ 19 ], weak bonding strength between cement and formation, and challenges in handling oil-laden cuttings [ 20 , 21 , 22 ]. Water-alkaline drilling fluids are evidently superior to oil-alkaline during the completion phase [ 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…During the completion phase, they can cause diffi in filter cake removal (Figure 1) [19], weak bonding strength between cement mation, and challenges in handling oil-laden cuttings [20][21][22]. Water-alkaline dril ids are evidently superior to oil-alkaline during the completion phase [23][24][25]. Reversible emulsified drilling fluid systems can achieve the conversion betwe and O/W emulsions by controlling the system's acidity and alkalinity.…”

Section: Introductionmentioning

confidence: 99%

Study on the Properties Changes of Reversible Invert Emulsion during the Process from O/W to W/O with Alkali

Liu,

Li,

et al. 2023

Molecules

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The reversible emulsion drilling fluid system combines the advantages of both oil-based and water-based drilling fluids, which can achieve ideal results in different stages of drilling and completion, and the system can be reused to effectively reduce costs. However, the research on reversible emulsions mainly focuses on the development of new reversible emulsifiers, while the specific phase transformation mechanism of reversible emulsion systems is still unclear. In this paper, a stable reversible emulsion was prepared using the reversible emulsifier DMOB as a raw material, and the reversible emulsion performance of the alkali response from the O/W emulsion phase to the W/O emulsion was studied. The microstructure of reversible emulsions was studied by a microscope, a cryogenic transmission electron microscopy, and a laser particle size analyzer. The changes in macroscopic properties of reversible emulsions in the process of alkali conversion were studied by pH, conductivity, demulsification voltage, static stability, viscosity, rheology, and other indicators, and the conversion mechanism of reversible emulsions from O/W emulsion ⟶ bicontinuous structure ⟶ O/W/O emulsion ⟶ W/O emulsion was clarified. The details are as follows: in the first stage, when the amount of NaOH ≤ 0.43 vol.%, the overall particle size of the emulsion decreases first and then increases with the increase in NaOH dosage. In the second stage, when the amount of NaOH was 0.45 vol.%, a double continuous structure was formed inside the emulsion. In the third stage, when the amount of NaOH is 0.48 vol.%, the O/W/O emulsion is formed, and with the increase in stirring time, the internal oil droplets gradually accumulate and are discharged from the water droplets, and finally, the W/O emulsion is formed. In the fourth stage, when the dosage of 0.50 vol.% ≤ NaOH ≤ 5.00 vol.%, the W/O emulsion was formed, and with the increase of NaOH dosage, the structure and compactness between water droplets increased first and then decreased. In the whole process, with the increase in the amount of NaOH solution, the total particle size of the emulsion first decreased and then increased.

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Synthesis and Plugging Performance of Poly (MMA-BA-ST) as a Plugging Agent in Oil-Based Drilling Fluid

Cited by 6 publications

References 25 publications

Study of a novel cross linked graft copolymer starch in water-based drilling fluid

Study of a novel cross linked graft copolymer starch in water-based drilling fluid

Probing the Effect of Young’s Modulus on the Reservoir Regulation Abilities of Dispersed Particle Gels

Study on the Properties Changes of Reversible Invert Emulsion during the Process from O/W to W/O with Alkali

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