Advantages to Running Multiple Howitzer Toe Sleeves Within A Single Wellbore

Challenge

• For many Operators, the limiting factor for casing integrity pressure tests is the toe initiation sleeve. 

• With the depth of high pressure, high temperature (HPHT) well designs, the hydrostatic pressure can limit the maximum applied pressure from surface against the toe initiation sleeves 

Solution

• The Howitzer pressure testable toe sleeve design supports higher applied pressure for testing requirements - all ports will independently open on bleed down 

• Multiple toe ports can be run as a redundancy option 

• Multiple toe ports in a wellbore reduces the risk of debris (e.g. cement stringers) plugging off the injection ports 

• Eliminates the need for perforating the first stage of a well 

• Can be used as the first stimulation stage if desired 

• Meets all regulatory pressure testing and casing integrity requirements 

Results

• Running multiple Howitzer toe sleeves is more economical than running other commercial options, and it can also be used as a limited entry frac stage 

• Savings to customers can exceed greater than $50k per well and 6 – 12 hours of coiled tubing run time

• More flow area than competing commercial toe ports 

• Optional ball seat configuration allows for multiple casing integrity tests

Interra Energy’s Thermal Overshot Resolves Casing Failure in SAGD Environment

Challenge

• An operator was experiencing casing failures in SAGD environments and wanted a solution to put their existing wells back on steam injection with minimal intervention required. 

• Fishing operations to recover the remainder of the string was becoming increasingly expensive due to the casing being structurally compromised in multiple locations and the completion being fished out in pieces. 

Solution

• Within a 6-week time period, Interra Energy developed the Thermal Overshot allowing operators to re-connect the existing completion string to surface and resume steam injection. 

• The Thermal Overshot is designed to function without tension or compression, which enables it to maintain a thermal seal for the life of the well. 

• Through a proprietary slip mechanism, the tool creates a thermal seal around the existing casing, resulting in a continuous flow of steam from surface to the toe of the well.

Results

• As of April 2020, Interra Energy has run 10 Thermal Overshot tools with 100% success, all of which are still in operation with the earliest installation being May 2016. 

• The Thermal Overshot eliminated the risk of costly fishing operations or potentially even losing portions of the well if the completion could not be fished.

Interra Energy Successfully Deploys 16,000 AccuJet® Toe Initiation Sleeves

Challenge

• Within the design of conventional burst ports, once one port is activated, pressure can travel outside the port and equalize, preventing other ports from opening. 

Solution

• Interra Energy challenged itself to create a new toe sleeve that incorporated the proven accuracy of burst discs, while guaranteeing 100% opening of the flow area. This reduced the limitations that were commonly seen with burst ports while injecting into the toe. 

Results

• The AccuJet toe initiation sleeve design, released by Interra Energy in 2013, uses multiple burst discs that only require one to be activated. This allows a sleeve to shift exposing all of the injection windows to the formation. 

• As of June 2020, there have been over 16,000 successful deployments of the AccuJet’s technology in such formations as the Viking, Montney, Cardium, Duvernay, Permian, Bakken, Haynesville and the Eagle Ford.

Interra Energy’s Howitzer Pressure Testable Toe Sleeve Enables Casing Integrity Test After Extended Periods Downhole

Challenge

• Marcellus Shale frac crew availability results in installations being left downhole over 200 days before successful operation.

Solution

• The Howitzer pressure testable toe sleeve was installed in the Marcellus Shale for a major Operator.

Result

• After 202 days, the Operator successfully performed a maximum casing pressure test to 12,800 psi for 30 minutes before the Howitzer pressure testable toe sleeve activated and established communication to formation.