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Oil field Calculation about Area, Volume and Capicity

For any oilfield analysis, it is necessary to understand how to calculate areas, volumes and capacities. Fortunately, areas and capacities of tubing and casing are in most field handbooks and in the engineering tables of this site. Most readers of this site will remember how to calculate areas and volumes from grade school, so only a brief review is presented here. The engineering tables at the back of this site provide all the necessary data to determine well capacities quite easily. The first few sample problems are solved manually to show how the tables were generated. Thereafter, the tables will be used as much as possible to simplify the problem solving. Understanding how the data was generated will make the calculations more meaningful and the tables easier to use. In any case, a clear understanding of the basic principles is necessary before proceeding as subsequent concepts will build on prior ones.
Oil Field Calculation


Most oilfield problems involve circular areas. The area of a circle is proportional to the square of its diameter.
The annulus is the space between two circles of different diameter. Most oilfield problems involve determining annular areas such as the cross sectional area of the tubing or finding the annular area between the tubing and casing. In the simplest terms, the annular area between two circles is the difference between the two areas.


Volume is arguably the most important quantity in solving oilfield problems. It is essential to estimating forces on downhole tools, timing arrival of plugs and calculating downhole pressures. In one form or another, all of these concepts rely on being able to calculate the volume of a column of fluid. Volume is the amount of space something occupies in three dimensions. Calculating volume is a simple matter once the area is known. Multiplying area (space in two dimensions) by height will give volume in three dimensions. The unit types of the two different quantities (area and height) must be the same (i.e. inches, feet, etc.). The units of volume then, will be inches3, feet3, etc. To avoid confusion, always use compatible units when doing any calculations.

For most service operations it is necessary to know the tubing, drill pipe or casing capacity. To place fluid at the proper depth during well servicing, it is important to know how much fluid to pump. As well, after adding a known amount of fluid to a well, determining the fluid level is possible using the techniques shown here. Determining well capacity is a straight forward application of the previous section. The units for well capacity are barrels (bbl), gallons (gal) and cubic feet (ft3). Since barrels are the most common American unit in the oil industry, most example problems will be in barrels.

Oil field Calculation about Area, Volume and Capicity Reviewed by Admin Industri Migas on 11:25 AM Rating: 5

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