«Onshore and offshore oil and gas well construction»

Improving the filtration and capacity characteristics of the bottomhole zone by means of acid treatment

UDC: 622.276
DOI: -

Authors:

¹ Azerbaijan State University of Oil and Industry, Baku, Azerbaijan
² Research Institute of Geotechnological Problems of Oil, Gas and Chemistry, Baku, Azerbaijan

Keywords: permeability, acid treatment, well, volumetric flow rate, formation thickness, dynamic viscosity, pore space, bottomhole zone

Annotation:

When solving numerous problems of field practice, it is necessary to clarify the main parameters that indirectly and directly affect the process of wells operation. Analysis proves the fact that by determining these parameters in advance, it is possible to calculate the volumetric flow rate of the produced liquid or to identify all the difficulties that arise during this process without additional costs. Practice shows that during drilling, a zone is formed around the well that is contaminated by clay solution. During deposits further development, especially heavy oils, further contamination of the bottomhole zone is often observed. The authors of the article proposed methods of influencing the bottomhole zone by an acid solution. The calculation methodology for the volume and time of acid solution impact is shown. The method allows increasing the permeability of the specified zone, and, ultimately, improving the formation parameters. At heavy oil fields, this process occurs in complicated conditions. Increasing the well depth, clogging the bottomhole zone with sand and clay solution negatively affect production, thus complicating the conditions for influencing the formation. Treatment by acid solution is used mainly in carbonate rocks. It should be noted that, unlike other methods – mechanical, thermal – the proposed method is simpler and does not require additional costs. At the same time, workers can use it in the field both during drilling and during operation.

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