40results about How to "Reduced pressure capacity" patented technology

The invention discloses a chemical grouting isolation device for downhole formation sealing, which comprises a relay container, the input end of the relay container is provided with a manual pump, and the output end of the relay container is connected with a grouting pipe through a throttle valve , the output end of the relay container is also equipped with a pressure gauge for detecting the pressure of the output end of the relay container, and a spray plug is set at the set position underground, and the spray plug at each set position is controlled by self-operated segmental pressure The valve communicates with the grouting section where the grouting pipe is located underground. Also disclosed is a chemical grouting sealing method for underground formation sealing. The invention has no damage to the casing, and easily realizes multi-layer isolation; the volume expansion rate is larger, and the downhole sealing adaptability is better, and the grouting operation at different depths can be realized through different injection pressure values ​​of a grouting pipe at the wellhead.

The invention discloses an internal high-pressure forming die for forming a pipe fitting of a step structure and a forming method thereof. The die comprises an upper die body, a lower die body, a left lining, a right lining, a left puncher pin and a right puncher pin. In the early stage of forming, an initial distance exists between the left lining and the side wall of a cavity of the pipe fitting as well as between the right lining and the side wall of the cavity of the pipe fitting, and the middle expansion portion is supplemented with materials by properly increasing the axial feeding amount through the left pincher pin and the right pincher pin. In the later stage of forming, the left pincher pin and the right pincher pin stop axial feeding, the left lining and the right lining move opposite to each other, pushing force is exerted on the middle expansion portion, and the friction force between a pipe and the die is greatly reduced since the side wall of the expansion portion is incompletely attached to the left lining and the right lining. Therefore, pressure required for forming of fillets is remarkably lowered, the wall thickness is obviously decreased, and requirements for the maximum tonnage of a die closing press, the bearing capability required for the die, the reliability of a sealing structure and pressure of a supercharger are lowered while requirements for forming the pipe fitting of the step structure are met.

A long-length hose spliced from two or more hoses containing an inner sealing layer, at least two spirally laid reinforcing plies, and a cover. A liner forming the inner sealing layer is formed by leak-tight splicing of liners of hoses to be spliced and the reinforcing plies are embedded into filling / adhesive material inside of a rigid outer sleeve, at the location of the splicing.