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Blast joint assemblies are used for integral prevention of erosion of a production string crossing a production zone and simultaneous protection of hydraulic, electric and/or optical lines which need to cross same zones to operate and retrieve data from downhole operated tools. Each assembly is comp

Blast joint assemblies are used for integral prevention of erosion of a production string crossing a production zone and simultaneous protection of hydraulic, electric and/or optical lines which need to cross same zones to operate and retrieve data from downhole operated tools. Each assembly is composed by one or more modular joint bodies having each at least one longitudinal slot on its outer surface; protecting covers shielding the longitudinal slots to house control lines housed in each of the longitudinal slots, with the protecting covers being properly retained on the related tubular joint body. The tubular joint bodies are precision machined to be connected by male and female threads granting an exact alignment of all slots in the blast joint(s) and allowing any combination of lengths for coping with any required assembly.

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1. A blast joint assembly for preserving a production tubing placed in a production zone in an oil or gas well, comprising: at least one tubular joint body having at least one longitudinal slot on its outer surface and having male and female end threaded connections allowing a precise metal to me

1. A blast joint assembly for preserving a production tubing placed in a production zone in an oil or gas well, comprising: at least one tubular joint body having at least one longitudinal slot on its outer surface and having male and female end threaded connections allowing a precise metal to metal make up between different modular joint bodies of the same assembly; at least one protecting cover shielding said longitudinal slot, capable of protecting control lines housed in said longitudinal slot(s), and means for retaining the protecting cover on the tubular joint. 2. A blast joint assembly according to claim 1, wherein each tubular joint body has two to four longitudinal slots evenly phased on the cross section. 3. A blast joint assembly according to claim 1, wherein said male and female threads are machined to have identical thread starting points in all joint bodies. 4. A blast joint assembly according to claim 3, wherein a make up torque range is foreseen for the connection of the male and female threads of two adjacent joint bodies, and wherein said torque is kept within said range for a precise alignment of the slots. 5. A blast joint assembly according to claim 1, wherein materials of the blast joint components comprise any suitable metallurgies exhibiting erosion/corrosion resistant properties. 6. A blast joint assembly according to claim 5, wherein the materials comprise a minimum hardness of 34 HRC. 7. A blast joint assembly for preserving a production tubing placed in front of a production zone, comprising: at least one tubular joint body having at least one longitudinal slot on its outer surface; at least one protecting cover shielding said longitudinal slot, capable of protecting control lines housed in said longitudinal slot(s), and means for retaining the protecting cover on the tubular joint, wherein said protecting cover is provided with a recess at the bottom end and an overlap at the top end for the protection of said control lines underneath at each cover joining point. 8. A blast joint assembly for preserving a production tubing placed in front of a production zone, comprising: at least one tubular joint body having at least one longitudinal slot on its outer surface; at least one protecting cover shielding said longitudinal slot, capable of protecting control lines housed in said longitudinal slot(s), and means for retaining the protecting cover on the tubular joint, wherein said protecting cover when used in end blast joint positions on assembled sequences of tubular joint bodies, has a bevelled outer surface. 9. A blast joint assembly for preserving a production tubing placed in front of a production zone, comprising: at least one tubular joint body having at least one longitudinal slot on its outer surface and having male and female end threaded connections allowing a precise metal to metal make up between different modular joint bodies of the same assembly; at least one protecting cover shielding said longitudinal slot, capable of protecting control lines housed in said longitudinal slot(s), and means for retaining the protecting cover on the tubular joint, wherein materials of the blast joint components comprise any suitable metallurgies exhibiting erosion/corrosion resistant properties. 10. A blast joint assembly according to claim 9, wherein the materials comprise a minimum hardness of 34 HRC.