«Oilfield engineering»

Control of chemical reagent usage during well stimulation operations by simulating friction pressure losses

UDC: 622.276.6
DOI: -

Authors:

¹ TatNIPIneft, PJSC "Tatneft", Almetyevsk, Russia
² KRS-Service, Almetyevsk, Russia

Keywords: geological and engineering activities, acid fracturing, efficiency analysis, mathematical model, friction pressure losses, supervising

Annotation:

The purpose of the work is to provide conditions for technologically correct geological and engineering activities (GEA) with the help of an additional tool for controlling chemicals consumption based on comparison of calculated and actual wellhead pressure curves. Building of an approximate calculation curve is based on the relative constancy of friction pressure losses for a certain process fluid flowing at a definite speed through a pipeline of a given diameter. In such a case, deviation from the design curve is possible only when the effective pressure changes, which, as a rule, changes smoothly. Thus, wellhead pressure sharp changes can be compared with changes of friction pressure loss coefficient and then the calculation of process fluid volumes based on the data in the model can be performed.

The use of an additional calculation tool of control is relevant, because in a number of cases, when analyzing the conducted GEA, the insufficient data for unambiguous interpretation of the results are observed. For example, during wells treatments, such as acid hydraulic fracturing, technological fluid compositions are injected into the well. Chemical reagents are used to prepare these compositions, the volume of which is GEA important parameter. At the same time, the actual volumes of chemicals used may differ from the planned volumes for a number of reasons, including technical ones. A standard GEA set includes control of chemical reagent use during movement from storage sites to the well site and supervision of geological and engineering operations.

In some cases, when analyzing the work performed, an additional source of data is required to confirm the actual volume of chemicals used. The authors of the article propose a method that allows modeling of friction pressure losses to capture actual transitions of GEA stages and to obtain chemical reagents volumes calculated using actual wellhead pressure measurements.

The scientific novelty of the work lies in the application of wellhead pressure digital records during well stimulation to calculate the actual volume of used compositions and to confirm the use of reagents planned volumes. For the first time a mathematical model of reagents actual volumes estimation, which does not require specialized software for application, was proposed. The proposed model makes it possible to confirm the actually used volume of reagents or, in case of deviations, can become the basis to claim activities and analysis of the conducted GEA efficiency.

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