Slickline conveyed debris management system
View Patent ↗A wellbore cleanup tool is run on slickline. It has an onboard power supply and circulation pump. Inlet flow is at the lower end into an inlet pipe that keeps up fluid velocity. The inlet pipe opens to a surrounding annular volume for sand containment and the fluid continues through a screen and into the pump for eventual exhaust back into the water in the wellbore. A modular structure is envisioned to add debris carrying capacity. Various ways to energize the device are possible. Other tools run on slickline are described such as a cutter, a scraper and a shifting tool.
1. A debris collection assembly for downhole use, comprising:
a housing and a slickline to support said housing downhole;
a pump operated by a power supply in said housing, said pump providing continuous circulation through said housing between an inlet and an outlet to said housing;
a debris collection volume in said housing positioned outside a flow path through said housing between said inlet and said outlet;
a control system in said housing to selectively operate said pump, said control system selectively turning off the pump when said housing is moved uphole a predetermined distance.
2. The assembly of claim 1 , comprising:
an inlet tube for incoming debris carried by fluid, said inlet tube extending from said inlet and further comprising at least one opening to said debris collection volume.
3. The assembly of claim 2 , comprising:
a screen in said housing through which fluid exiting said inlet tube flows before reaching said pump.
4. The assembly of claim 2 , comprising:
a static mixer in said inlet tube to impart a swirl to debris laden fluid flowing through said inlet tube.
5. The assembly of claim 2 , wherein:
said housing comprises a plurality of modules each having an inlet tube with an opening to said debris collection volume and where fluid flow continues from one inlet tube to the next before reaching said pump.
6. The assembly of claim 5 , wherein:
debris separated from fluid in a given module stays in that module.
7. The assembly of claim 1 , comprising:
said control system starts said pump with a time delay or a sensing of depth in the wellbore.
8. The assembly of claim 1 , comprising:
a vibrator on said housing to agitate debris adjacent said inlet.