Apparatus and method for abrasive perforating and cleanout

摘要

An apparatus and a method of performing a plurality of operations in a wellbore with one direction of flow. A multicycle open/close valve (MCOCV) responsive to a plurality of flow rates is placed in a bottom hole assembly (BHA) and is used to perform abrasive perforating of a wellbore or cleanout of the wellbore using one direction of flow. At one or more first flow rates, the MCOCV is configured to operate in a first operating mode to abrasive perforate the wellbore. At one or more second flow rates, the MCOCV is configured to operate in a second operating mode to cleanout the wellbore. In an embodiment, the MCOCV includes a J-slot sequencing mechanism responsive to a sequence of flow rates to cycle the MCOCV through a plurality of operating modes.

主权项

1. A method of completing a wellbore using a bottom hole assembly requiring only one direction of flow, the wellbore having been lined with a string of production casing along a subsurface formation, and the method comprising:
running a bottom hole assembly into the wellbore on a lower end of a string of coiled tubing, the bottom hole assembly comprising:
a tubular housing providing an elongated bore through which fluids may flow, the tubular housing having one or more jetting nozzles disposed therein,a piston disposed at an upstream end of the housing, the piston forming a pressure shoulder downstream from the coiled tubing and having at least one orifice delivering fluids from an internal bore of the coiled tubing to the elongated bore of the housing,a tubular mandrel slidably positioned within the housing, the mandrel having a proximal end connected to the piston, and at least one flow port along a body of the mandrel,a plunger disposed along the mandrel, and providing a seal for the distal end of the mandrel, anda seat residing at a distal end of the tubular housing dimensioned to sealingly receive the plunger when the piston and connected mandrel slide from a first open valve position to a second closed valve position; locating the bottom hole assembly at a selected zone of interest in the subsurface formation; injecting fluids down the coiled tubing and into the bore of the tubular housing at a first flow rate, thereby causing the fluids to flow through the at least one orifice in the piston, through the at least one flow port in the mandrel, around the distal end of the mandrel, through the seat, and back up an annular region defined between the bottom hole assembly and the surrounding production casing; further injecting a fluid down the coiled tubing and into the bore of the tubular housing at a second flow rates that is higher than the first flow rate, thereby increasing a hydraulic force acting on the pressure shoulder of the piston and causing the mandrel to slide from its open position to its closed position wherein the plunger is landed on the seat, thereby forcing the injected fluid to flow through the nozzles in the tubular housing; and injecting a jetting fluid through the nozzles in the tubular housing, thereby jetting one or more perforations through the production casing at the selected zone of interest along the wellbore.