  Self-propelled droplets serve as ideal model systems to delve deeper into
understanding of the motion of biological micro-swimmers by simulating their
motility. Biological microorganisms are renowned for showcasing a diverse array
of dynamic swimming behaviors when confronted with physical constraints. This
study aims to elucidate the impact of physical constraints on swimming
characteristics of biological microorganisms. To achieve this, we present
observations on the individual and pair-wise behavior of micellar solubilized
self-propelled 4-Cyano-4'-pentyl-biphenyl (5CB) oil droplets in a square
capillary channel filled with a surfactant trimethyl ammonium bromide (TTAB)
aqueous solution. To explore the effect of the underlying P\'eclet ($Pe$)
number of the swimming droplets, the study is also performed in the presence of
additives such as high molecular weight polymer Polyethylene oxide (PEO) and
molecular solute glycerol. The capillary confinement restricts droplet to
predominantly one-dimensional (1D) motion, albeit with noticeable differences
in their motion across the three scenarios. Through a characterization of the
chemical and hydrodynamic flow fields surrounding the droplets, we illustrate
that the modification of the droplets' chemical field due to confinement varies
significantly based on the underlying differences in the P\'eclet number ($Pe$)
in these cases. This alteration in the chemical field distribution notably
affects the individual droplets' motion. Moreover, these distinct chemical
field interactions between the droplets also lead to variations in their
pair-wise motion, ranging from behaviors like chasing to scattering.
