초록 ▼

A wellhead isolation tool comprises a threaded drive rod coaxially aligned with a tubular mandrel having a smooth outer surface. A motor displaces the threaded drive rod vertically without rotating the drive rod to move the tubular mandrel through a wellhead into a tubular element in a well. The low

A wellhead isolation tool comprises a threaded drive rod coaxially aligned with a tubular mandrel having a smooth outer surface. A motor displaces the threaded drive rod vertically without rotating the drive rod to move the tubular mandrel through a wellhead into a tubular element in a well. The lower end of the tubular mandrel will sealingly engage the tubular element in the well so that treating fluids or other substances such as, but not limited to, chemicals and erosive flows, can be displaced therethrough at high pressures into the well to fracture or otherwise treat the well without damaging the wellhead.

대표청구항 ▼

A wellhead isolation tool comprises a threaded drive rod coaxially aligned with a tubular mandrel having a smooth outer surface. A motor displaces the threaded drive rod vertically without rotating the drive rod to move the tubular mandrel through a wellhead into a tubular element in a well. The low

A wellhead isolation tool comprises a threaded drive rod coaxially aligned with a tubular mandrel having a smooth outer surface. A motor displaces the threaded drive rod vertically without rotating the drive rod to move the tubular mandrel through a wellhead into a tubular element in a well. The lower end of the tubular mandrel will sealingly engage the tubular element in the well so that treating fluids or other substances such as, but not limited to, chemicals and erosive flows, can be displaced therethrough at high pressures into the well to fracture or otherwise treat the well without damaging the wellhead. ording to claim 2, further comprising, drawing a temperature distribution graph of said plurality of temperature measurement points based on the results of said measurements, and appropriately selecting conditions including positions of said nozzle, heat radiation means and said heating means on said nozzle so as to ensure that the temperature distribution graph has at least one portion where a gradient of the graph becomes gentle or substantially flat so that the substantially flat portion is defined as said optimum temperature region. 4. A method for manufacturing a mold according to claim 1, wherein said metal is a magnesium alloy, and said optimum temperature region ranges between 520° C. and 560° C. 5. A method for manufacturing a mold according to claim 2, wherein said metal is a magnesium alloy, and said optimum temperature region ranges between 520° C. and 560° C. 6. A method for manufacturing a mold according to claim 1, wherein heat insulating means or heat radiation means is formed on the nozzle for regulating the temperature gradient of the metal from a portion where the heating means is formed to the tip of the nozzle. 7. A method for manufacturing a mold according to claim 2, wherein heat insulating means or heat radiation means is formed on the nozzle for regulating the temperature gradient of the metal from a portion where the heating means is formed to the tip of the nozzle. ing is performed through a vacuum device connected to core marks. 8. The method pursuant to claim 1, further comprising cooling the casting mold after and/or during the filling of the casting mold in the displacing step. vered fibers into twisted yarns having a pre-determined color which will be imparted to the toweling product; 7. accumulating the yarns on a loom beam following warping/slashing the yarns in preparation for the weaving process; 8. weaving said colored yarn into the ground warp, the fill and the pile warp yarns in the toweling product which preferably is a continuous process; 9. bleaching and subsequently washing and drying said toweling product prior to finishing; wherein the color in the imparted to the institutional toweling product is obtained by the weaving of said draw blended yarn only with no subsequent dying process being necessary and wherein the resulting products have: viii) a minimum color variation from batch to batch, ix) improved colour fastness, the color being imparted to the toweling product by the pre-dyed polyester fiber allowing all institutional towels resulting from this process to be able to be washed and handled together, x) a significantly longer life expectancy of the toweling product imparted by the pre-dyed polyester fiber, and the ability of the toweling product to be manufactured into a matching set of toweling products having minimum color variation from product to product wherein a ratio of less than or equal to about 8% of the pre-dyed polyester fibers with the balance being the cotton fiber is utilized in manufactured the yarns imparting the color to said product. 11. A process for manufacturing institutional terry/toweling products having improved colour fastness and durability comprising the steps of: 1. providing cotton fibers; 2. providing pre-dyed polyester fibers; 3. orienting the fibers of the cotton in substantially a uniform parallel direction by carding; 4. orienting the pre-dyed polyester fibers in substantially parallel direction by a carding process; 5. draw blending the cotton and pre-dyed polyester fibers in a slivering process; 6. following the intimate draw blending of the pre-dyed polyester and cotton fibers spinning the slivered fibers into twisted yarns having a pre-determined color which will be imparted to the toweling product; 7. accumulating the yarns on a loom beam following warping/slashing the yarns in preparation for the weaving process; 8. weaving said colored yarn into the ground warp, the fill and the pile warp yarns in the toweling product which preferably is a