In an innovative action, the experts of Pezhvak Energy Engineering Services Company managed to significantly reduce the completion fluid cost of the Sepehr-Jufair oilfield project by changing the composition of the completion fluid.

Liquid Calcium Bromide was supposed to be used as completion fluid with a purify of 52%, which was unaffordable due to the lack of domestic producers. Liquid calcium bromide with a purity of 52% was to be used as the completion fluid, Since the chemistry of completion fluids plays a crucial role in success of a well, a plan was put forward by the drilling fluid manager of the Sepehr-Jufair oilfield project based on combining "calcium chloride powder" with a purity of 95% with "calcium bromide" and saturated liquid calcium chloride in certain ratios, based on pilot tests on density, turbidity, insolubility, crystallization and corrosion.

All these tests were carried out by the Research Institute of Petroleum Industry and Razi Applied Science Foundation Laboratory, and finally the feasibility of this model was confirmed.

Based on laboratory confirmations and correspondence with the client of the project, and after obtaining the necessary approvals, the proposed completion fluid was used in the second phase of Sepehr 3 oil field well completion, which resulted in a significant reduction in calcium consumption to more than 50%. It should be mentioned that in the first phase of completion of Sepehr 3 well, in the previous method, calcium bromide fluid was used with a weight of 102 PCF, and in the new method, this operation was finally carried out with a consumption of 80 IBC.

Since the consumption of calcium bromide has decreased significantly according to the project client, the proposed completion fluid will be used by other clients for future completion wells.

It is worth noting that, the application of this method has resulted in a large reduction in the cost of Sepehr-Jufair oil field completion fluid to 42 billion Tomans and it is expected to cut down expenses to 80 billion Tomans by the end of the completion of other wells.