Straddle packer with fluid pressure packer set and velocity bypass

A straddle packer with fluid pressure packer set and velocity bypass, comprising:

• a multicomponent mandrel having a central passage that extends from an upper end to a lower end of the multicomponent mandrel, the multicomponent mandrel having a completion string connection mandrel component at an upper end of the straddle packer to permit the connection of a tubing string to the straddle packer and a velocity bypass crossover at a lower end of the straddle packer to permit the connection of a velocity bypass sub;
• an upper packer element and a lower packer element that respectively surround the multicomponent mandrel in a spaced apart relationship;
• a modular pressure cylinder that reciprocates within a restricted range on an active mandrel tube component of the multicomponent mandrel, the modular pressure cylinder including a plurality of interconnected pressure cylinder modules connected end-to-end;
• an upper compression bell that compresses the upper packer element and a lower compression bell that compresses the lower packer element when fluid is pumped into the straddle packer at a flow rate that exceeds a flow rate threshold, the upper compression bell being connected to an upper end of a sliding sleeve that is connected by a crossover to an upper end of interconnected cylinder walls of the modular pressure cylinder, and the lower compression bell being connected to a lower end of interconnected pistons of the modular pressure cylinder;
• an upper and a lower mandrel tube of the multicomponent mandrel, the upper mandrel tube being connected on a top end to the completion string mandrel component and on a lower end to a mandrel flow sub, and an upper end of the lower mandrel tube being connected to a lower end of the mandrel flow sub and on a lower end to the active mandrel tube component of the multicomponent mandrel, the mandrel flow sub including at least one mandrel flow sub nozzle;
• and
• the velocity bypass sub having a central passage in fluid communication with the central passage of the multicomponent mandrel and housing a velocity bypass valve having the flow rate threshold, whereby fluid pumped through the completion tubing string into the multicomponent mandrel flows through the at least one mandrel flow sub nozzle and the velocity bypass valve until a flow rate of the fluid exceeds the flow rate threshold, after which the velocity bypass valve closes and the fluid flows only through the at least one mandrel flow, sub nozzle and into fluid ports of the modular pressure cylinder, urging pressure pistons of the modular pressure cylinder in a first direction and pressure cylinder walls of the modular pressure cylinder in an opposite direction along an axis of the active mandrel tube component to compress the respective packer elements to a packer set condition.

A straddle packer with fluid pressure packer set and velocity bypass, comprising:

• a multicomponent mandrel having a completion string connection component which is threadedly connected to an upper mandrel tube;
• a mandrel flow sub connected to a downhole end of upper mandrel tube;
• at least one mandrel flow sub nozzle in the mandrel flow sub;
• a lower mandrel tube connected to a downhole end of the mandrel flow sub;
• a mandrel tube crossover component connected to a downhole end of the lower mandrel tube;
• the active mandrel tube component connected to a downhole end of the mandrel tube crossover component;
• a lower packer element mandrel sleeve component connected to a downhole end of the active mandrel tube component;
• a lower crossover sub connected to the downhole end of the lower packer element mandrel sleeve component;
• an upper packer element and a lower packer element that respectively surround the multicomponent mandrel in a spaced apart relationship;
• a modular pressure cylinder that reciprocates within a restricted range on an active mandrel tube component of the multicomponent mandrel, the modular pressure cylinder including a plurality of interconnected pressure cylinder modules connected end-to-end, each modular pressure cylinder including:
• a pressure cylinder wall;
• a pressure piston with a pressure piston seal that seals against an inner surface of the pressure cylinder wall;
• each pressure piston reciprocating within a pressure cylinder chamber;
• pressure cylinder seals that respectively inhibit the migration of fluid out of the respective pressure cylinder chambers;
• each pressure piston having a pressure cylinder male coupling sleeve and a pressure cylinder female coupling sleeve;
• the respective pressure cylinder male coupling sleeves having an external thread that engages an internal thread in the respective pressure cylinder female coupling sleeves to connect the respective pressure pistons together;
• respective pressure cylinder coupling seals to inhibit any migration of fluid between the pressure cylinder male coupling, sleeves and the pressure cylinder female coupling sleeves;
• a pressure cylinder fluid port to let the high pressure fluid flow through the active mandrel tube fluid ports into the respective pressure cylinder chambers;
• and pressure cylinder pressure equalization ports in the respective pressure cylinder walls to equalize pressure behind the respective pressure pistons with ambient wellbore pressure;
• an upper compression bell that compresses the upper packer element and a lower compression bell that compresses the lower packer element when high pressure fluid is pumped into the straddle packer at a flow rate that exceeds a predetermined flow rate threshold, the upper compression bell being connected to an upper end of a sliding sleeve that is connected by a crossover to an upper end of interconnected cylinder walls of the modular pressure cylinder, and the lower compression bell being connected to a lower end of interconnected pistons of the modular pressure cylinder;
• an upper and a lower mandrel tube of the multicomponent mandrel, the upper mandrel tube being connected on an upper end to the completion string mandrel component and on a lower end to a mandrel flow sub, and an upper end of the lower mandrel tube being connected to a lower end of the mandrel flow sub and on a lower end to the active mandrel tube component of the multicomponent mandrel, the mandrel flow sub including at least one mandrel flow sub nozzle;
• and
• a velocity bypass sub connected to the velocity bypass sub crossover, the velocity bypass sub having a central passage in fluid communication with the central passage of the multicomponent mandrel and housing a velocity bypass valve having the flow rate threshold, whereby fluid pumped through the completion tubing string into the multicomponent mandrel flows through the at least one mandrel flow sub nozzle and the velocity bypass valve until a flow rate of the fluid exceeds the flow rate threshold, after which the fluid flows only through the at least one mandrel flow sub nozzle and into fluid ports of the modular pressure cylinder, urging pressure pistons of the modular pressure cylinder in a first direction and pressure cylinder walls of the modular pressure cylinder in an opposite direction along an axis of the active mandrel tube component, to compress the respective packer elements to a packer set condition.