Well operations

Patent metadata

Field	Value
Publication number	US-10119378-B2
Application number	US-201514639770-A
Country	US
Kind code	B2
Filing date	Mar 5, 2015
Priority date	Mar 5, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

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.

First claim

What is claimed is:

1. 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.

2. The method of claim 1 , wherein the determined flow rate in the coiled tubing is from about 0.3 to about 0.8 bbl/min.

3. The method of claim 1 , wherein flow rate through coiled tubing after increase is from about 3 to about 6 bbl/min.

4. The method of claim 1 , wherein the increase of bottom hole pressure is at least of about 100 psi.

5. The method of claim 1 wherein the fluid pumped through coiled tubing is a neat fluid.

6. The method of claim 1 wherein the fluid pumped through coiled tubing is a Newtonian fluid.

7. 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.

8. The method of claim 7 , wherein the determined flow rate in the coiled tubing is from about 0.3 to about 0.8 bbl/min.

9. The method of claim 7 , wherein flow rate through coiled tubing after increase is from about 3 to about 6 bbl/min.

10. 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.

11. The method of claim 10 wherein the casing comprises a plurality of reclosable sleeves at desired locations and the wellbore is cemented.

12. The method of claim 11 further comprising conveying an actuation device to one of the plurality of reclosable sleeves, actuating the device to open a sleeve and performing the fracturing operation.

13. The method of claim 12 further comprising closing the sleeve, conveying the actuation device to another of the plurality of reclosable sleeves, actuating the device to open another sleeve, and performing a further fracturing operation.

14. The method of claim 12 , wherein the other sleeve is downhole from the one of the plurality of reclosable sleeves.

15. The method of claim 12 , wherein the other sleeve is uphole from the one of the plurality of reclosable sleeves.

16. 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.

17. The method of claim 16 , wherein no sealing element is used.

18. 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.

Assignees

• Schlumberger Technology Corp

Inventors

• Lesko Timothy
• Ramakrishnan Hariharan
• Potapenko Dmitriy
• Ramsey Leland

Classifications

• E21B17/20

  Flexible or articulated drilling pipes {, e.g. flexible or articulated rods, pipes or cables} · CPC title

• E21B2200/06

  Sleeve valves · CPC title

• E21B47/06

  Measuring temperature or pressure · CPC title

• E21B43/26 Primary

  by forming crevices or fractures · CPC title

• E21B2034/007

  Fixed Constructions · mapped topic