Burleson Energy announces status of the T2H horizontal development well
Thursday, Nov 08, 2012

Burleson Energy (BUR) provides the following update on the status of the Truchard #2 horizontal well (T2H) as at 7 November 2012 (Texas time).

The T2H well was brought on to gas sales on 27 October 2012 (condensate has been produced and stored from early in the well clean-up period). Prior to being shut-in for remedial work on 3 November, the well was flowing at a restricted rate of 1.5 mmcf gas and ~70bbl condensate per day with some 1,400 barrels of water per day (which is a manageable level with current lease equipment).

Burleson is pleased to advise that progress has been made towards identifying the source of the excess water produced during the flow back of the well. Two “spinner” surveys have been run in an effort to determine which, if any, of the six frac slots have abnormally high water flow. In both cases the spinner tool failed*, and the diagnostic information sought was not recorded. Ancillary temperature information was recorded in the first run, however, and this indicates that frac slot 6 (the slot located closest to the vertical section) is possibly producing water at abnormally high rates.

The current plan is to set a retrievable packer below frac sleeve 6 and test flow from frac slots 1 to 5 through production tubing, while waiting to see if recorded spinner data can be recovered from the first spinner tool. If the water flow is significantly reduced relative to gas flow by this procedure, then water influx into frac sleeve 6 may be able to be remediated (leaving frac sleeve 6 still open) or sleeve 6 can be “squeezed-off” and the well produced from the bottom 5 frac sleeves.

This work is expected to be completed within the next week. The cost of the work will be ~$120,000 (100% share), of which about half is already accounted for in the original well budget.Technical information Two spinner surveys were run aimed at identifying which of the 6 frac slots in the horizontal part of the well produce excess water. In these surveys, data is downloaded after the tool has been recovered from the wellbore, and just one of the surveys has provided any useful information to date. Based on this limited data, it appears that frac slot number 6 is producing excess quantities of water.

Importantly, this slot is located in the “heel” of the well bore in the highly curved part of the wellbore between the vertical and horizontal sections. It is possible that this zone has a connection “behind pipe” with known lower pressure, higher permeability water filled sands located above the T2H reservoir sands due, perhaps, to a poor quality cement bond through the bend in the wellbore.

Pressure data from various parts of the well bore support this suggestion. If this hypothesis proves correct, the problem can be rectified by squeezing cement behind the casing above frac sleeve 6.Background The T2H well is a major step in the development of the Heintschel field, a substantial gas-condensate discovery hosted by Wilcox Formation tight sand reservoirs in Colorado County, Texas. The well is located 785 metres from Burleson’s established producing Truchard #1 (vertical) well. It is the fourth well on the Heintschel gas condensate field - and is the first horizontal development well.

The well was drilled to a total length of 13,525 feet (4122 metres) including a horizontal section 2,300 feet (700 metre) long. It was initially drilled to a true vertical depth of 11,500 feet (~3,500m) where casing was set. The second phase involved drilling the horizontal section and setting casing in the horizontal leg. The final phase involved a six stage frac, which followed by a clean- up phase prior to completion and hydrocarbon sales.

Source: Burleson Energy Limited

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