通过安装封隔器、落球和套筒，明确了压力界限，整个阶段的酸化增产均取得了较好的效果。
All stages were successfully stimulated with acid, with clear pressure indications of packers setting, balls landing and sleeves shifting.
美国VTON威盾进口气动多级式降压调节阀，采用套筒导向，压力平衡式阀芯。
The United States VTON Granville shield imported pneumatic multi-stage step-down regulator valve, using the sleeve guide, pressure balanced valve.
讨论了套筒表面的喷砂处理，选择不同的磨料、时间及压力可得到套筒不同的表面形状及粗糙度。
The sleeve surface processing is discussed, choosing different abrasive, time and pressure will result in different surface shape and rough parameter.
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