Abstract
The article deals with the increase of profitability of water shutoff treatment (WST), which is used to eliminate behind-the-casing flows (cross-flow) in production and injection wells. It is presented that modern technologies of water shut-off works have low efficiency (success rate), especially in liquidation of non-perforating interval. Inefficient (wasteful) injection is currently one of the main problems in the development of oil and gas fields, as it significantly reduces the oil recovery factor in addition to the huge costs for oil companies for injection (operating costs). The article presents the results of hydrodynamic research and proposes methods for determining the presence of behind-the-casing flows (BCF) and methods for detecting wasteful injection without geophysical well-logging (a non-standard approach). The article also presents equipment for the elimination of the behind-the-casing flow and technology of its implementation.
Highlights
An alternative view on the unproductive injection is a behind-the-casing flow (BCF)
The results of early studies [1, 2, 3] revealed the existence of effective technologies for solving this problem. The applicability of these results and products is limited by their cost and conditions of use, as only the payback of the proposed technologies requires an increase of oil production no less than 250 tons/day from each well, while in the conditions that are investigated in this work, the maximum level of oil production that the company produces from one well is no more than 5-6 tons/day
The main tasks solved in this study are the analysis of optimal conditions that ensure maximum efficiency of behind-the-casing flow elimination (BCFE), as well as searching for ways to reduce the operational cost of it
Summary
An alternative view on the unproductive (wasteful) injection is a behind-the-casing flow (BCF). Oil and gas companies annually spend huge amounts of money to eliminate them, but the success rate of these works does not exceed 40% (Figure 1). ˗ lack of efficient BCFE technology; ˗ unreasonable costs for BCFE work over, since geophysical well logging methods for determination of BCF are not sufficiently informative (Figure 2). The main tasks solved in this study are the analysis of optimal conditions that ensure maximum efficiency of behind-the-casing flow elimination (BCFE), as well as searching for ways to reduce the operational cost of it. Based on the obtained results, the authors developed optimal criteria for selecting objects and effective BCFE method that is applicable both at the field studied in this paper and other similar oil and gas fields.
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