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Economical Analysis of Acidizing Job by Using Coiled Tubing and Bullheading Method for Improved Well Productivity

Proceedings Title : Proc. Indon. Petrol. Assoc., 42nd Ann. Conv., 2018

Acidizing is the common way to improve production by stimulating a well which involves the pumping of acid into the formation through the wellbore to remove or reduce formation damage around the wellbore. The damage is result of deposition of minerals from water formation around the wellbore or pipe, and it is also known as scale. Coiled tubing and bullheading are the methods to place the acid into the wellbore. Each method affects the process differently and gives different result of the project. The main difference between the two methods is how to place the acid to the interval target. Coiled tubing will place acid directly to the target interval. The cost of each method is different as well. The ultimate aim of all the activities in the oil and gas industry is to maximize profit and minimize costs. It is imperative for engineers to ensure that every decision is made, will guarantee the optimal production and return a substantial income to the company. Therefore, before making a decision to select the most appropriate method, we have to consider the economics of the project in order to get maximum profit and there are many parameters that we can analyze such as the incremental well productivity and pump performance after job and also analyze Net Present Value (NPV), Discounted Profit to Investment (DPI), Pay Out Time (POT) and the Rate of Return (ROR) of each project. NPV is the difference between the present value of cash inflows and the present value of cash outflows, DPI is ratio between profit to investment of project, POT is the length of time to reach a cumulative cashflow of zero and ROR is the discount rate often used in capital budgeting that makes the net present value of all cash flows from a particular project equal zero. This paper will compare the results of analyzing those parameters and we can therefore understand the most efficient and cost effective method of using either coiled tubing and bullheading by the results of the analysis.

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