Enhancing swelling rate for subterranean packers and screens
The swelling rate of a swelling packer element or a conforming foam screen material is accelerated with heat. In one variation reactants that create an exothermic reaction plus a catalyst, if needed, are allowed to come into contact upon placement at the desired location. The heat accelerates the swelling process and cuts the time to when the next operation can commence downhole.
1. A method of acceleration of swelling of an element at a subterranean location, comprising:
locating the element at a desired location using a tubular string;
generating heat within said element using reactants stored in said element during said locating to accelerate swelling of said element;
moving said element to seal against a targeted surface from said swelling.
2. The method of claim 1 , comprising:
separating said reactants until said element is located at the desired location.
3. The method of claim 2 , comprising:
using a removable barrier to separate said reactants.
4. The method of claim 3 , comprising:
using said barrier as a wall for adjacent sealed chambers that hold discrete reactants.
5. The method of claim 4 , comprising:
allowing said reactants to mix by defeating said barrier.
6. The method of claim 5 , comprising:
defeating said barrier by exposing it to differential pressure.
7. The method of claim 6 , comprising:
exposing one of said chambers to annulus hydrostatic pressure or pressure added to the annulus to defeat said barrier.
8. The method of claim 5 , comprising:
defeating said barrier with physical force.
9. The method of claim 8 , comprising:
using an advancing cutter for defeating said barrier.
10. The method of claim 9 , comprising:
driving said cutter directly or indirectly from within said tubular string.
11. The method of claim 10 , comprising:
driving said cutter with a sleeve whose movement urges said cutter into said barrier using direct contact through a wall opening in said tubular string.
12. The method of claim 10 , comprising:
creating a field within said tubular string that provides the energy to drive said cutter into said barrier without a wall opening in the tubular string.
13. The method of claim 5 , comprising:
defeating said barrier by chemical reaction or dissolving.
14. The method of claim 13 , comprising:
making one of said reactants corrosive to said barrier.
15. The method of claim 14 , comprising:
making said barrier of an electrically conductive material;
heating said barrier with an induction heater to accelerate barrier corrosion.
16. The method of claim 5 , comprising:
defeating said barrier after a predetermined time measured on a timer.
17. The method of claim 5 , comprising:
defeating said barrier with heat provided by well fluids adjacent said element.
18. The method of claim 4 , comprising:
locating said chambers wholly within said element.
19. The method of claim 1 , comprising:
locating a catalyst in said element.
20. The method of claim 19 , comprising:
locating a catalyst with at least one said reactant.
21. The method of claim 1 , comprising:
making said element impervious for packer service or porous for screen service.
22. A method of acceleration of swelling of an element at a subterranean location, comprising:
locating the element at the desired location using a tubular string;
generating heat within said element using reactants stored in said element;
separating said reactants until said element is located at the desired location;
using a removable barrier to separate said reactants;
using said barrier as a wall for adjacent sealed chambers that hold discrete reactants;
allowing said reactants to mix by defeating said barrier;
defeating said barrier by chemical reaction or dissolving;
making said barrier a sacrificial member of a galvanic pair to defeat said barrier.
23. A method of acceleration of swelling of an element at a subterranean location, comprising:
locating the element at the desired location using a tubular string;
generating heat within said element using reactants stored in said element;
separating said reactants until said element is located at the desired location;
using a removable barrier to separate said reactants;
using said barrier as a wall for adjacent sealed chambers that hold discrete reactants;
allowing said reactants to mix by defeating said barrier;
defeating said barrier by chemical reaction or dissolving;
making one of said reactants corrosive to said barrier;
providing a sacrificial anode in contact with said barrier to initially protect said barrier from corrosion;
separating said anode from said barrier to accelerate barrier corrosion.
24. The method of claim 23 , comprising:
moving a cathodic material against the barrier after said separating to accelerate corrosion of said barrier.
25. A method of acceleration of swelling of an element at a subterranean location, comprising:
locating the element at the desired location using a tubular string;
generating heat within said element using reactants stored in said element;
separating said reactants until said element is located at the desired location;
using a removable barrier to separate said reactants;
using said barrier as a wall for adjacent sealed chambers that hold discrete reactants;
allowing said reactants to mix by defeating said barrier;
defeating said barrier by chemical reaction or dissolving;
making one of said reactants corrosive to said barrier;
providing a cathodic material in one of said compartments;
moving the cathodic material against said barrier to accelerate corrosion of said barrier.