In March 2005, at Bonny Natural Gas (BNAG), Aftrac limited was again mobilized to monitor and detect sand production during well clean up and testing. The results of the process optimized production, increasing it by over 100 MMSCF/day from four different gas wells using sand rates and quantification from an improved calibration procedure.

On the 29th of March 2002 , Aftrac limited was mobilized to the NUN River field (SPDC EAST) with sole objectives of improving sensor calibration and establishing direct correlations between the acoustic sand detection and the conventional sampling methods.After some days of study, the results were outstanding. Not only was a direct correlation achieved between the two methods, the acoustic detection method was found to be a more efficient method of sand detection and quantification.

In October 2002, at SPDC EA DP-A (EAST), Aftrac limited was contracted to identify and quantify sand from sand producing wells during well clean up after completion had been carried out on these wells. The process confirmed the existence of a major sand producing well (EA-35) which has not been a regular flowing string due to its sand problem.

Since January 2004, ClampOn portable units have been deployed for Well Clean up and Testing operations for Gas wells in SPDC in the following fields: SOKU – 9 wells, BNAG – 4 wells, Utorogu – 4 wells, Assa-North – 1 well, two formations, Kolo-creek – 1 well and Zarama – 1 well. This brings the total to 20 Gas wells so far for SPDC.

There are seven permanently installed sensors on BNAG facilities, and the contract to have several sensors permanently mounted at ALAKIRI Gas well facility is already in progress.

In April 2005, at Ebughu field, Aftrac was contracted by Addax to detect and identify sand producing wells; optimize production; verify the efficiency of a self-clean up program for Well Ebughu 8HT associated with an episodic sand burst (responsible for the skin effect at the well bore) by carrying out an increasing choke changing sequence. At the end of the entire exercise a net oil of 521 BOPD (218%) was gained on Well Egbuhu 8HT after a sand outburst measuring an average of 5.71lb/mbbl and a peak of 324.76lb/mbbl was affirmed using ClampOn DSP particle monitor.

In march 2006, at Okwori field, Addax contracted Aftrac to help establish a maximum sand free production rate for well OK 8, train selected Addax personnel and use the tool as a sand management strategy to co-produce oil and sand to maximum allowable limit ensuring formation stabilization. Just as in the previous case, some barrels of oil were also gained.

In December 2005, at OML 100/102 FIELDS, Total contracted Aftrac to monitor sand production during normal well production. IME 07, IME 10 and IME 04 wells were all identified as major sand producers and were all later shut in due to excessive sand production in test separator. In August 2006, at same OML 100 field, Aftrac, using a Clamp On sand injector system identified major sand producing wells and established allowable/free sand producing rates.

Elf Petroleum Nigeria Limited (TOTAL) procured 5 portable units and 3 permanently installed units of ClampOn DSP particle monitors for their sand management plan for Amenam-Kpono (OML 99) field / facilities. With the wells completed on consolidated sandstone without any downhole sand control mechanism in place, ClampOn DSP particle monitor has been deployed since December 2003 to identify sand producers and quantify sand produced; monitor producing strings during well testing on different choke openings thereby creating a historic sand data; establish maximum sand free limits during MER test. Following the success of the portable units in use an additional 3-unit kit of permanently installed acoustic sand probes equipment have been procured for AMP1 and AMP2 platforms and the installation is currently ongoing.