Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10895210.54859/kjogi108952ASSESSMENT OF THE EFFECTIVENESS OF CAPEX/OPEX ASSOCIATED WITH THE UPGRADE OF TECHNOLOGICAL FACILITIES WITHIN THE FRAMEWORK OF THE DEVELOPMENT OF FIELD XSuleimenYerlan Melsulysyerlan75@yandex.ruhttps://orcid.org/ORCID 0000-0002-5959-4013SatenovKurmet<p>Сandidate of chemical sciences, Expert of Major Projects Support Department</p>K.Satenov@kmge.kzhttps://orcid.org/0000-0002-6396-913XKynyrtaiMira Sabetkhanqyzy<p>Engineer of&nbsp;</p> <p>Major Projects Support Department</p>M.Kynyrtai@kmge.kzhttps://orcid.org/0009-0000-5075-9283SalimgereyevAset Malikovich<p>Director of the PSA Project Support Department</p>A.Salimgereyev@kmge.kzhttps://orcid.org/0009-0008-6453-2416KMG Engineering LLP“KMG Engineering” LLP831102202630072026Copyright © , Suleimen Y.M., Satenov K., Kynyrtai M.S., Salimgereyev A.M.<p><strong>ABSTRACT</strong></p> <p>The expiration of the design service life of production facilities at Field X necessitates an assessment of the economic efficiency of capital (CAPEX) and operating (OPEX) expenditures associated with the upgrade of process facilities, as well as the development of recommendations for optimizing investment decisions, taking into account the forecasted decline in production and the prospects for further field development.</p> <p>This study is based on data from the development project of Field X and is aimed at substantiating optimal technical and economic solutions that ensure the efficient utilization of existing infrastructure and an increase in the overall profitability of field development.</p> <p>In the course of the research, a new concept for the development of Field X was formulated, forecast values of CAPEX and OPEX were calculated, and an economic assessment was performed using incremental analysis.</p>field Xliquid hydrocarbonCAPEXOPEXinfrastructure upgradenew development conceptincremental analysis.Х кен орнысұйық көмірсутектер (СК)CAPEXOPEXинфрақұрылымды жаңғыртуигерудің жаңа тұжырымдамасыинкременттік талдау.месторождение Хжидкие углеводороды (ЖУ)CAPEXOPEXмодернизация инфраструктурыновая концепция освоенияинкрементный анализ.1.1. Vadetsky Yu.V. Drilling of oil and gas wells. Moscow: Academy, 2013. C. 352.2.2. Order of the Minister of Energy of the Republic of Kazakhstan No. 17131 dated June 28, 2018, “On the Approval of Uniform Rules for the Rational and Comprehensive Use of Subsoil Resources.” Access mode: https://adilet.zan.kz/rus/docs/V1800017131. Date of access: February 3, 2026.3.3. Lysenko V.D. Development of oil fields. Design and analysis. Moscow: Nedra, 2003. P. 638.