Abstract: In order to meet the requirements for the complex field conditions for oil and gas extraction,it is proposed to employ the hot-extrusion process to produce small-sized,heavy-wall 110S-13Cr seamless steel pipe that is to be used as the coupling blank.Described here in the paper are the main aspects of the said hot-extrusion process,including the deformation characteristics,the extrusion mill proper and design of the extrusion tools and dies. Also detailed are the hot-extrusion manufacturing process flow for the 110S-13Cr heavy-wall seamless steel pipe,and relevant production control tips. The small-sized seamless steel pipe as made with the above mentioned hot-extrusion process features surface quality and dimension tolerance superiorities,and has all of its properties satisfactory to applicable technical requirements,being widely applicable to the industrial fields like oil and gas production.