Blank casing is usually used to clean out sand, but when bottom - hole pressure is low, this may result in no fluid flowing at wellhead and recharging of removed sand, which may affect sand removal or even lead to failure.
油田生产中,经常出现井底砂埋现象,影响采油或注水,通常的做法是下光管冲砂,但这种方法在井底压力较低时可能造成井口不返液及冲起的砂液回灌地层,影响清砂效果甚至可能造成清砂作业失败。
Application of PIG cleanout sands in the underground oil pipeline on Sudan District Six
清管器在苏丹六区地下输油管线清砂中的应用
Sand and rusts removing of large-sized cast iron,cast steel,steel structures,large-sized forging and surface freatment of oxidized workpieces.
大型铸铁、铸钢件，钢结构件、大型锻件，热处理件的清砂、除锈去除氧化皮表面清理等。
open-pressure blasting
露天压风喷砂清理法
chain continuous sling shot blasting shakeout machine
吊链连续抛丸落砂清理机
sand and varnish a chair
用砂纸把椅子打磨光再涂上清漆
powdered sugar
(作清凉饮料用的)粉末砂糖
They proceeded at once to extract the interior mould, clearing out the boring of the piece.
他们立时动手掘砂模，掏清炮筒。
Researches on Decolorization of Remelt Syrup of Brown Granulated Sugar
赤砂糖回溶糖浆澄清脱色方法的研究
A place where a placer deposit is washed to extract its mineral content.
砂矿开采地一个用来清洗出有用矿物的砂矿开采地
Use a vacuum cleaner to remove dust, sand residue, and other contaminants.
用真空清洁器除去粉尘、残砂和其他污染物。
Clean process of animal protein glue mold and core sand foundry
铸造动物蛋白质胶型芯砂的清洁生产工艺
Study on Manufactured Sand Fair-faced Concrete and Its Apparent Quality Evalution;
人工砂清水混凝土的研究及其外观质量评定
Clarifying Historical Facts and Correcting Mistakes by the Original;
廓清史实,正本驳讹——唐诗《井栏砂宿遇夜客》研究
Determination of the Content of Bilirubin and HgS in Wanshi Niuhuang Qingxin tablets
万氏牛黄清心片中胆红素和朱砂的含量测定
Fine sand cloth or emery cloth may be used with the same precautions.
细砂布或金刚砂布可以采用，但和采用钢丝刷一样也要避免对金属过分清除。
It is not allowed to clean up cooling fluid and abrasive dust or to replace work-piece before the grinding wheel comes to a standstill.
砂轮未完全处于静止状态时，不许清理冷却液，磨屑或更换工件。
A mini-sized sand-blasting gun of ejection-and absorption type, used to clean and roughen the metallic surfaces for thermal spraying.
一种小型的射吸式喷砂枪，可用作喷涂喷焊前的表面清洁毛化处理。
Ingredients: pure olive essential oil, gingko essence, liquorice essence, codonopsis pilosula, peony, allantoin, tea tree oil etc.
成份：清纯橄榄精油、银杏精华、甘草精华、砂参、芍药、尿囊素、茶树油等。
