The Crissman "A" Lease is a 3 well lease producing from the Tarkio sandstone and Lansing Kansas City limestone into a common tank battery. They are located in the Gorham Field in Russell County. The wells trend in an east to west line with Crissman "A" #1, then #4 , then #2. All three wells pull negative wellhead pressure, consequently the typical fluid squeeze method which disperses oil recovery fluids into the critical matrix by developing positive fluid pressure will be modified slightly. The #2 well is thought to have slight to moderate wellbore plugging. This well initially received a near wellbore clean-up treatment followed by modified fluid squeeze treatments.
Oil and water production will be monitored for 30 days and evaluated to judge the initial treatment's effect on total fluid production. This data will help establish a baseline from which the quantity of treatment fluid and re-treatment intervals for follow-on and maintenance treatments will be determined.
INITIAL TREATMENT - Crissman "A" #1 & #4 Wells
[9/16/2009]
Modified Fluid Squeeze
Pump off wellbore fluids-observed system to be under a vacuum when bull plug was removed [9/16/2009]
Inject 20 gallons of diesel into the well annulus
Dose by injecting 50 gallons microbial EOR fluid into the well annulus
Inject 10 barrels of produced oil into the well annulus [9/16/2009]
Shut in for 2 days
Turn back into production - [9/18/2009]
Produce the well and gauge total fluid production for 30 days
Note and record any observations that deviate from the normal production pattern for this well on the gauging report
INITIAL TREATMENT - Crissman "A" #2 Well
[9/16/2009]
Modified Near Wellbore Clean-up
Pump off wellbore fluids- observed system to be under a vacuum when bull plug was removed
Inject 20 gallons of diesel into the well annulus
Inject 15 gallons of microbial EOR fluid into the well annulus
Inject 5 barrels of lease water into the well annulus [9/16/2009]
Shut in for 2 days
Turn back into production [9/18/2009]
Produce the well and gauge total fluid production for 30 days
Note and record any observations that deviate from the normal production pattern for this well on the gauging report
NOTE: When produced oil is used to create positive displacement pressure for a fluid squeeze, it plus the oil production 'lost' during shut-in are typically recovered as 'flush production' within a day or two after the well is turned back into production.
NOTE: This lease received an initial microbial EOR treatment on 9/16/2009. On 12/28/2009 replaced pump on Well #2, on 1/14/2010 pulled and steamed rods and acidized Well #1 and #4. Microbial EOR treatments were restarted on 4/14/2010 three months after workovers and acidizing to allow time to establish new baseline pre-treatment production data.
FIRST TREATMENT AFTER RESTART - Crissman "A" Lease - [4/14/2010]
All three Crissman wells received the same treatment as follows:
Pump off wellbore fluids
Inject 25 gallons of diesel into the well annulus
Inject 50 gallons microbial EOR fluid into the well annulus [4/14/2010]
Inject 25 gallons of diesel into the well annulus
Shut in for 2 days
Turn back into production [4/17/2010]
Produce the well and gauge total fluid production for 30 days
Note and record any observations that deviate from the normal production pattern for this well on the gauging report
SECOND TREATMENT AFTER RESTART - Crissman "A" Lease - [6/02/2010]
- Pump off wellbore fluids
- Inject 25 gallons of diesel into the well annulus
- Inject 50 gallons microbial EOR fluid into the well annulus [6/02/2010]
- Inject 25 gallons of diesel into the well annulus
- Shut in for 2 days
- Turn back into production [6/02/2010]
- Produce the well and gauge total fluid production for 30 days
- Note and record any observations that deviate from the normal production pattern for this well on the gauging report
Note: The third Crissman treatment will be determined after the results of the second treatment are analyzed.
CONTROL TREATMENTS
Control treatments are an important component of this field project. They will help establish baseline data to differentiate between the treating methodology alone without MEOR treatment fluid and treatments made with MEOR fluid. Ram has asked the co-operating oil producers to conduct control treatments on a cross-section of candidate wells selected for this project. Control treatments do not have to be run on every well involved in the field trials. Control treatments will be run only on single wells. Control treatments will not be conducted on enhanced waterflood projects.
Control treatments should be conducted one (1) month before actual MEOR treatments begin to enable 20 to 30 days of post-production data to be gathered before the actual MEOR treatments begin.