Well operations
AssigneeSchlumberger Technology Corporation
InventorsTimothy Lesko, Hariharan Ramakrishnan, Dmitriy Potapenko, Leland Ramsey
Life of this patent
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Abstract
The disclosure pertains to methods for completing a well may comprise lowering a coiled-tubing in the well thus forming an annulus between the casing and the coiled-tubing, pumping down said annulus a treatment fluid above the fracturing pressure of the formation while also pumping fluid through the coiled tubing. The methods may also comprise monitoring in real-time the bottom hole pressure and increasing the pump rate through the coiled-tubing if an increase of bottom hole pressure is observed.
Claims18
A method for treating a cased hole wellbore comprising:
- Lowering down a coiled tubing in the casing, thus forming an annulus between the casing and the coiled-tubing;
- Pumping a fracturing fluid through said annulus;
- Simultaneously pumping a fluid through the coiled tubing at a determined flow rate tubing while pumping the fracturing fluid down the annulus;
- Monitoring a bottom hole pressure;
- Wherein in case of an increase of bottomhole pressure corresponding to a potential screenout, the flow rate of the fluid pumped through the coiled tubing is increased.
A method for preventing screenout in a wellbore being hydraulically fractured, the wellbore comprising a casing and a coiled tubing within the casing thus forming an annulus;
- the method comprising
- Monitoring bottomhole pressure in the wellbore;
- Pumping through the annulus a fluid above the fracturing pressure of the wellbore;
- Simultaneously pumping a fluid through the coiled tubing at a determined flow rate tubing while pumping the fluid through the annulus;
- Increasing the flow rate through the coiled tubing when an increase of bottomhole pressure is observed.
A method for completing at least a zone of a well using a pin-point fracturing technique comprising a cased hole formation having a coiled-tubing disposed in the casing, the methods comprising simultaneously flowing fluid through the coiled-tubing and an annulus formed between the coiled tubing and the casing, monitoring a bottom hole pressure in real time, and increasing the flow rate through the coiled-tubing when an increase of bottom hole pressure is observed.
A method for completing a well comprising:
- (i) Installing a tubing mounted with sliding sleeve in a drilled well;
- (ii) Lowering an actuation device attached to a coiled tubing, thus forming an annulus with a casing in the well;
- (iii) Opening a sleeve;
- (iv) Pumping a fracturing fluid down the annulus at or above a fracturing pressure of a well formation while simultaneously pumping a neat fluid through the coiled tubing;
- (v) Closing the sleeve;
- (vi) Repeating steps (iii) to (v);
- Wherein the method comprises monitoring a bottom hole pressure in real time and increasing the flow rate through the coiled-tubing when screen out favorable pressure is observed.
A method for completing a well, the well having a tubing mounted with sliding sleeves, comprising:
- Lowering a bottom hole assembly (BHA) using a coiled tubing thus forming an annulus between said coiled tubing and the tubing, the BHA comprising a shifting element;
- Opening a sliding sleeve with the shifting element;
- Pumping a fracturing fluid down the annulus,
- Simultaneously pumping a neat fluid through the coiled tubing while pumping the fracturing fluid down the annulus,
- Calculating in real time a bottom hole pressure,
- Increasing the flow rate in the coiled tubing when an increase of bottom hole pressure is observed while fracturing;
- Further fracturing at least another zone;
- Wherein all steps are done without having the BHA coming out of the well.
Dependencies are inferred from the claim text.