Abstract
Abstract Reservoir protection in well drilling and well completion is one of the most significant challenges that have been connected with the quality of the temporary plugging zone and the recovery value of the reservoir permeability when the foreign water invaded into the reservoir copied with the temporary plugging agents. The regular temporary plugging agents are linked with high demand for the matching rate about the pore throat of formation, effect of a single, and poor environmental performance, etc. which markedly impact the operational efficiency. This work reports the synthesis and characteristic of starch-based degradable water-absorbent resin to protect the layer during drilling. Both degradable and excellent SDTA through introducing the nanometre calcium carbonate composites which used as the rigid core were synthesized, characterized, and revalued with standard methods. After purification, there were some groups including the carboxylic acid group, amide group, methyl group, and S=O which reflected the successful synthesis of the monomers. The composites displayed remarkable salt resistance and calcium resistance with 5% and 0.5% as well as thermal stability of 130°C and degradation rate of 50%, respectively. Results also demonstrated that SDTA composites could make the mud cake structure more compact and exhibit self-adaptive to the formation. The SEM images of mud cake treated SDTA revealed that the mechanism could be base on the collaborative action of the structure compact and holes plugging to form an impressive filter cake which could effectively avert the water molecules invasion into the reservoir. Hence, SDTA composites could be a suitable material as a degradable temporary plugging agent for well drilling and completion.
Highlights
Reservoir protection has been recognized as a major challenge in well drilling and well completion especially when the foreign fluid invaded into the reservoir [1, 2]
Water-absorbent resin is a kind of polymer with hydrophilic groups, which is associated with a three-dimensional network structure with a certain degree of crosslinking, can swell in contact with water but not dissolve, and exhibits variability and self-adaptability remarkably [4,5,6,7,8]
The Thermogravimetric analysis (TGA) displaying the thermal stability of starch and starch-based degradable temporary plugging agent (SDTA) is displayed in Figures 3(a) and 3(b)
Summary
Reservoir protection has been recognized as a major challenge in well drilling and well completion especially when the foreign fluid invaded into the reservoir [1, 2]. The starch-based water-absorbent resin as a crosslinked polymers connecting with a three-dimensional network structure has the starch degradability and the thermal resistance and salt resistance of monomer [15] This makes it to be integrated into diverse formations in industries such as agriculture, pharmaceuticals, foods, oil, and gas, [16]. We designed starch-based degradable temporary plugging agent (SDTA) that could serve as an excellent WBDF additive in oil and gas drilling operations. Their mode of action could be premised on the synergetic effort of the structure compact and the plugging ability that could allow prevention of foreign fluid from engrossing into the reservoir
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
