Document Type : Original Article
Department of Petroleum, the Faculty of Engineering, Koya University, University Park, Kurdistan Region - F.R. Iraq
This paper discusses the movement of reservoir fluids movement and shows the procedure of using field measurement unit (Slickline Unit) to determine the contacts between the reservoir fluids (oil, gas & water contacts).
In reservoir engineering, various tasks are required to be performed; one of these tasks is the monitoring of the change in the level of fluids and drive forces movement. Nowadays, field measurements unit is as an important technique for monitoring the reservoir behavior. This work is carried out as a requirement of reservoir engineering tasks in one of the oil fields in Iraq. The name of the field is not mentioned in this work due to the confidentiality of the publication and wells are named as K#. Currently oil is produced in 40 wells while the reservoir is monitored through observation wells of K#01, K#02 & K#03.
The oil production mainly has been produced from the K field for about 6 years starting with around 10,000 bbl/day for the first year and gradually increasing to 120,000 bbl/day now. Before implementing field measurement unit, there were no a reliable survey on subsurface condition of the field. Thus, to have extensive monitoring on the production, the subsurface field measurement data of these wells are processed, through entering row field data of both reservoir properties and bottom-hole configuration for each well.
This research paper includes a brief introduction to the field that is considered in this dissertation and SLICKLINE unite which used for recording bottom-hole field measurement. Followed by other sections which gives an example on indicating fluid level contacts for one well and the data for the rest of wells are been tabulated. The selected wells after processing the subsurface data for two different times, W.O.C contacts determined for K#01, K#02 & K#03 are 649 & 644 m AMSL, 637 & 638 m AMSL and 637 & 683 respectively. In addition, the cumulative oil production from the hole field is been ploted showing how the production affected the reservoir pressure declining from just belwo 1200 psig to 1170 psig at the calculated datum-level of 630 m AMSL.
Finally, a plot of contacts movement is constructed showing the G.O.C is going down from 593 m AMSL to 596 m AMSL and W.O.C rising from 657 m AMSL to 651 m AMSL, for the two different time.