What is re-fracking’
Re-fracking is the oil companies ‘ practice of returning to older shale oil and shale gas wells they have worked in the recent past to capitalize on new, more effective extraction technology. Re-fracking can be effective, especially in hard deposits where the shale produces low yields, as it can increase their performance and extend their life expectancy.
For example, the organization of re-fracturing in the Bakken shale fields of North Dakota to review a number of wells drilled between 2008 and 2010 in connection with the improvement of fracking technology. According to the North Dakota pipeline authority, organization re-fracture of more than 140 wells in the Bakken as of mid-2017, and most saw an increase in production volumes as a result. Similarly, the company re-fracturing other well-established, large shale formations in the U.S., such as Eagle Ford and the Barnett, in Texas.
Re-fracking in its basic form-is shooting a mixture of sand and water behind and to increase production. Companies use this feature in some degree for decades. The mixture can help to keep the cracks open after they form, which allows oil to flow more quickly, increasing the amount that the company can extract from the reservoir.
Re-fracking to the fore recently, the company is now working is a long-used method with vertical drilling processes and technologies, providing access to deposits, which they previously could not access.
To this end, the company is now re-fracking some wells in as little as three years ago. One of the methods in the re-fracking process involves sealing cracks in the shale wells small plastic balls, so that the new proppant can find its way into tighter cracks using high pressure.
The pros and cons of re-fracturing
Wells can cost many millions of dollars to drill and complete, and some of them have very low rates of return, as well as large areas of the deposits which produce either nothing, or almost nothing. The attractiveness of re-fracking is that it may allow new technologies to extend the life of existing wells, where exploration and production companies have already found some success.
Another advantage for exploration and production of the company is that of re-fracking projects often cost much less than new vertical wells.
As in the case of hydraulic fracturing in General, however, re-fracking is controversial because the amount of natural resources, as well as more noticeable because the negative effects it could have on air, water and soil in areas where fracking has taken place. For example, one of the main chemicals used in the fracking process is methane that enters the atmosphere during mining. Because methane is 25 times stronger than carbon dioxide in terms of trapping heat, the release of this gas have a negative impact on air quality in the vicinity of the incident scene.
(For more, see: Fracking can’t happen without these companies) and (why Schlumberger is a name you should know.)