Case Studies

Gas Shut-Off for Light/Medium Oil

Based on the successful results of the AICV® in shutting off unwanted gas and increasing oil production autonomously a number of new wells have been planned and deployed in the field.

Objectives
One of the largest oil fields in the Middle East was developed in the 1960’s and the field was initially produced under natural depletion supplemented by gas injection. The high offtake rates led to a rapid displacement of the gas/oil contact, the field has been suffering from early gas/water breakthrough and uneven fluid influx along the horizontal wells. The reservoir which has been on production more than 50 years, and water and gas breakthrough from fractures are the major challenge negatively affecting the oil production rate. Due to this novel inflow control technologies were evaluated to control unwanted gas production.


Approach
After considering options such as conventional ICD and AICD from other vendors, the operator wanted to verify InflowControl’s AICV® in 2 wells. InflowControl was tasked with the challenge to stop gas production and bringing the oil production back to commercial rates.
 
Result
The AICVs was deployed in a number of wells in the field that had extremely high Gas Oil Ratio (GOR) and low oil production. The AICV® can differentiate between fluid types based on viscosity, then when unwanted gas starts to be produced; AICV starts to choke flow area gradually until completely shut-off without well intervention. The unique comparison of production data before and after installing AICVs demonstrated the benefit of installing AICV®. The results demonstrated that the AICVs is closing for zones with high gas production and favour oil rich zones. The wells evaluated demonstrated clearly that the extremely high GOR was reduced to solution GOR, and at the same time the daily oil production was increased. 

Based on the successful results a number of new wells have been planned and deployed in the field.

Figure 1:  Well A Production Performance before and after AICV installation.

Production performance before and after AICV Installation.

Figure 2:  Well B Production Performance before and after AICV Installation

Well B Production Performance before and after AICV Installation.