Surestrong Machinery Co.,Ltd is one of the leading China casing scraper manufacturers and suppliers, welcome to check casing scraper price and design with us, and also we are always able to offer you casing scraper for sale. SpecificationsCasing Scraper is ideal for the removal of dirt which may be left over the inside walls of casing. Casing Scraper specs:Before run into downhole,the max. installation size of blade shall be bigger the inside diameter,after run into downhole,the blade is pressed to press the spring down,theradial force is given by spring. When hard materials need to be scrapped,scrapping for several times must be done before scrapped to casing inside diameter. The scraper is connected on the low end of drill string,the moving of drill string up and down make an axially feeding in the scrapping operation.It is showed in the structure that each spiral blade has two internal and external curved scrapping edges. When the blade is working for reciprocating scrapping,the internal edge and external edge are working in turn,and there is a wider transverse edge band between two scrapping edges stands a cutting and milling action to the cut surface.The strap blades are uniform distributed on the scraper so that the returned mud can take the scraped substances away. When ordering please specify:*Casing Scraper Model;*Connection, if nonstandard;*Casing size and weight. specifications - Casing Scraper1.UseCasing Scraper is used in drilling or repairing well. It can scrape off the dirt,cement scale,deposit of wex and salt,perforation burr and rust on the face inside casing, so that every tool can be freely through he casing. In drilling or repairing Job, scraping casing have been a necessary process to promote efficiency (for instance: raise sealing function of packer).2.StructureSpring Casing Scraper is made up mainly of body ,scraper,block,screw and spring. Please see figure. Body has drill pipe box and pin screw at the top and bottom of it, and a bore used for circulating mud. The face of scraper is round and has screw edges on it. Both ends of scraper are taper so as to make it smoothly pass through the hole of casing collar. There are four springs between he other face of scraper and body; Reacting force of the pressed springs makes scraper keep close to casing wall.3. principle of workCasing Scraper Works in the hole of casing pipe. When Casing Scraper comes into the hole of casing pipe, the springs of it are compressed by scraper. The scraper Keeps close to casing wall because of reacting force of the compressed springs.There are two way to scrape casing wall .One is that you make Casing Scraper go up and down many times. You can scrape up and down, because many edges of scraper face upward and others face down ward. If the deposit on the casing wall was very hard, you have to scrape up and down many times to scrape off all of it. Another way is that you make Casing Scraper go up and down repeatedly and revolve in right-hand direction at the same time until Casing Scraper does not go. Advantage scraping way as above is able to promote scraping efficiency and keeps drilling tool in safety because the joint of drilling string can not screw off.4.Operation and Note things(1)OperationSelect a Casing Scraper fitting to the size of casing pipe to be scraped and determine the depth to be scraped.Put the Casing Craper down in the hole of casing pipe slowly to the place to be scraped and start circulating mud.When circulating mud keeps normally, revolve drilling string in right-hand direction slowly while making the Casing Scraper go up and down repeatedly slowly.When the weight of drilling string does not change with going up and down, make known the deposit on the casing wall having been scraped off.(2)Note thingsMust screw on every joint of drilling string firmly to prevent screwing off.The screw pin of Casing Scraper can be upward or downward.You ought to make drilling string revolve right hand some revolutions when it is prevented from going down, and then go on putting it down.5,Maintaining(1)Wash Casing Scraper after working and inspect it. If any part isdamaged or any spring is out of shape, must change them.(2)Main parts or positions of Casing Scraper apply antirust greaseand put it in a dry room.
