Wellbore isolation forms a critical segment of well-completion workflows for unconventional hydrocarbon reservoirs. Magnesium dissolvable plug eliminates mechanical milling operations by undergoing controlled electrochemical degradation once assigned isolation tasks complete. Selection of such hardware demands alignment with physical and chemical states existing within wellbore cavities. Variations across subsurface environments create distinct boundary conditions that shape mechanical retention and degradation kinetics. Operators gather reservoir datasets to narrow material grades and structural configurations before tool deployment. This paper lays out structured evaluation dimensions to support specification definition for field deployment.

1.Assessment of subsurface thermal and pressure boundary conditions

1.1 Reservoir temperature mapping

Temperature exerts measurable influence over alloy reaction rates inside closed wellbore spaces. Thermal readings collected from target intervals set baseline constraints for candidate hardware. Materials formulated for moderate-temperature zones show accelerated degradation when placed in high-temperature compartments. Material grain structures and trace-element ratios undergo adjustment to offset thermal-driven rate shifts. Data acquisition shall cover static bottom-hole temperature and transient thermal fluctuations generated during pumping cycles.

1.2 Differential pressure capacity matching

Pressure differentials emerge across plug assemblies throughout stimulation pumping cycles. Every Magnesium dissolvable plug carries documented pressure ratings derived from laboratory hydrostatic testing. Calculated peak differential values from fracturing simulation output define minimum threshold values for component specification. Structural geometry, alloy tensile performance and sealing unit composition collectively define pressure-holding limits. Mismatch between field pressure loads and component rating triggers seal loss before operational objectives finish.

2.Analysis of wellbore fluid chemical properties

2.1 Salinity and chloride ion concentration

Electrolyte composition of formation and injected fluids modulates magnesium alloy dissolution pathways. Chloride ions act as reaction activators for magnesium matrix corrosion. High-salinity brine environments shorten retention windows, while low-chloride fluid surroundings extend the full-breakdown timeline. Laboratory compatibility testing reproduces well fluid chemistry to record strength decay curves. These test outputs serve as reference benchmarks for grade screening.

2.2 PH value and injected treatment fluid

Acid-containing stimulation fluids introduce additional variables for material assessment. Acidic environments raise electrochemical activity and shorten functional retention cycles. Formulation adjustment offsets accelerated degradation for wells scheduled for acid treatment. Operators document all injected fluid recipes when submitting technical requirements for Magnesium dissolvable plug procurement.

3.Validation of operational retention and degradation windows

Time sequencing divides the service cycle into two distinct phases. The isolation phase requires stable mechanical integrity to maintain zonal separation. The degradation phase allows progressive material breakdown into fine particles removable through flowback channels. Operators calculate time spans covering setting, multi-stage pumping and post-treatment standby periods. Alloy formulation tunes retention spans to cover the full operational sequence. Deviation creates two undesirable scenarios: premature structural failure during pumping, or persistent solid residues obstructing wellbore passages after work concludes. Laboratory coupon testing under replicated well conditions provides quantifiable degradation profiles for specification confirmation.

4.Review of casing geometry and physical installation constraints

Internal casing dimension sets dimensional limits for tool outer profiles. Casing steel grade governs bite performance of slip components integrated on plug assemblies. Horizontal wellbores bring extra considerations for running-in friction and setting reliability. Hardware dimensions must maintain clearance against casing inner walls throughout descent. Dimensional mismatch produces setting malfunctions or casing surface damage during field execution. Datasets for casing size, weight grade and well trajectory feed into final configuration confirmation.

5.Evaluation of downhole flow and sand carrying conditions

Subsurface flow dynamics and solid particle content constitute key factors affecting the working stability of isolation tools during construction. Downhole fluid flow rates and scouring intensity impact the surface integrity of alloy components in long-term isolation operations. Formation sand particles carried by circulating fluids produce continuous micro-abrasion on plug surfaces, which may affect structural stability and regular degradation rhythms. Operators need to collect actual flow parameter data and formation sand content indicators of target reservoirs to select tailored structural designs and alloy formulas. Reasonable matching of tool wear resistance and anti-scouring performance ensures the Magnesium dissolvable plug maintains stable working performance throughout the whole construction cycle without abnormal structural damage.

Complete understanding of subsurface thermal, pressure, chemical and geometric parameters underpins rational Magnesium dissolvable plug specification. Each parameter interacts with alloy metallurgy and component structure to shape on-site performance. Reliable tool performance draws from systematic collection of reservoir data and cross-reference against verified laboratory test records. Meiyin Technology maintains material-development partnerships with academic research institutions for magnesium-alloy system optimization, offering configurable hardware matched against diversified downhole datasets for global well-completion projects.