56results about How to "Safeguard Resilience" patented technology

A pipe body structure of a step type hole protecting pipe for a gas extraction hole in a soft coal bed, and belongs to the hole protecting pipe. The hole protecting pipe comprises multiple groups of pipes, which are connected from the front end to the tail end in sequence; the diameters of the pipes in different groups are different, the diameters of the pipes in each group of pipes from the front end to the tail end of the hole protecting pipe are reduced in sequence, and every two adjacent pipes in different groups are connected through a reducer pipe; the whole profile of the hole supporting pipe is of a step type structure with a gradually changed diameter; the diameters of the pipes in the same group are the same, and the lengths of the pipes are the same; sieve pores are not formed in the pipe walls of one group of pipes at the most front end but are formed in the pipe walls of the rest groups of pipes, and the pore diameters of the sieve pores in the pipes in the same group are the same; the number of the sieve pores in each group is reduced from the front end to the tail end in sequence; the diameters of the sieve pores in each group are reduced from the front end to the tail end in sequence, the minimal diameter is 4 mm, and the maximal diameter is 10 mm; and the sieve pores are externally wound with gauzes. The pipe body structure has the advantages as follows: the structure is simple, the hole protecting pipe is not easily blocked and is more easily fed in a deflected drilled hole due to large flexibility, the hole protecting length is long, and the gas extraction efficiency is high at the same time. Therefore, the pipe body structure is suitable for the gas extraction hole in the soft easily-collapsed coal bed.