A Case Study of Joule-Thomson Effect on Subsurface Safety Valve Installation for Supercritical Carbon Dioxide Injection Well BACHELOR THESIS Evan William 12219068 Submitted as partial fulfillment of the requirements for the degree of BACHELOR OF ENGINEERING in Petroleum Engineering study program PETROLEUM ENGINEERING STUDY PROGRAM FACULTY OF MINING AND PETROLEUM ENGINEERING INSTITUT TEKNOLOGI BANDUNG 2023 A CASE STUDY OF JOULE-THOMSON EFFECT ON SUBSURFACE SAFETY VALVE INSTALLATION FOR SUPERCRITICAL CARBON DIOXIDE INJECTION WELL BACHELOR THESIS Evan William 12219068 Submitted as partial fulfillment of the requirements for the degree of BACHELOR OF ENGINEERING in Petroleum Engineering study program Approved by: Thesis Adviser, Ardhi Hakim Lumban Gaol, S.T., M.Si., Ph.D. Wijoyo Niti Daton, S.T., M.T. NIP 1987063020121210001 NIP 1982092720150410001 1 A Case Study of Joule-Thomson Effect on Subsurface Safety Valve Installation for Supercritical Carbon Dioxide Injection Well Evan William*, Ardhi Hakim Lumban Gaol** and Wijoyo Niti Daton** Copyright 2023, Institut Teknologi Bandung Abstract When supercritical CO 2 injected through a well for CCS or CCUS purposes passes an insulated valve – a Subsurface Safety Valve (SSSV) – the Joule-Thomson Effect shall occur. This effect, causing temperature drop caused by the pressure drop in an isenthalpic condition, can become hazardous for our tubing, casing, and well, eventually damaging operation. As the temperature may drop to below 0°C, valves may freeze, metals and subsurface materials may embrittle – causing reduced pressure or load capability. An analysis of how the SSSV bean sizes correlates to the magnitude of each case of temperature drop of sCO 2 is done to understand how to avoid the problem. An analysis of the tubing used and how each tubing and SSSV causes sCO 2 temperature to drop is also necessary. By analyzing the temperature profile along the well depth using PIPESIM Steady State Multiphase Flow Simulator and the abnormalities occurred when the sCO 2 passes through the SSSV, we can obtain a better picture of how the sCO 2 reacts to throttling in different diameter or sizes, and in line to it, the Joule-Thomson Effect and temperature drop. Ultimately, an array of recommended SSSV and tubing sizes is expected to be obtained for our well, which offers a minimized risk of temperature drop. It is expected that with optimum SSSV and tubing size, the injection process can run smoothly without phase changes, while at the same time – by the presence of SSSV – protects our well and surface facilities from unwanted wellbore fluids and provides structural integrity from embrittlement or load capability decrease. Keywords: supercritical CO 2, injection, Joule-Thomson effect, subsurface safety valve, temperature drop Sari Ketika CO 2 superkritis yang diinjeksikan melalui suatu sumur untuk keperluan CCS atau CCUS melewati suatu katup terinsulasi – dalam hal ini suatu Subsurface Safety Valve (SSSV) – akan terjadi efek Joule-Thomson. Efek ini mengakibatkan penurunan temperatur, dikarenakan penurunan tekanan dalam kondisi isoentalpik, dan berpotensi membahayakan tubing, casing, dan sumur kita – dalam jangka panjang membahayakan operasi. Karena temperatur dapat turun mencapai di bawah 0 derajat Celsius, katup dapat membeku, material bawah permukaan dapat merapuh – mengakibatkan penurunan kemampuan maksimum menerima tekanan dan beban. Analisis tentang bagaimana ukuran SSSV berkorelasi dengan besar penurunan temperatur dilakukan untuk memahami bagaimana cara mencegah permasalahan ini terjadi. Analisis bagaimana tubing yang akan digunakan dan relasinya dengan SSSV mengakibatkan temperature sCO 2 untuk menurun juga dilakukan. Dengan menganalisis profil temperatur seiring kedalaman menggunakan PIPESIM Steady State Multiphase Flow Simulator dan abnormalitas yang terjadi Ketika sCO 2 melewati SSSV, kita dapat memperoleh gambaran yang lebih baik mengenai bagaimana sCO 2 bereaksi terhadap throttling pada diameter dan ukuran yang berbeda-beda, dan selaras dengan itu, efek Joule-Thomson dan penurunan temperature. Pada akhirannya, diharapkan dapat diperoleh satu susunan rekomendasi ukuran SSSV dan tubing untuk sumur kita, yang mana rekomendasi ini dapat meminimalisir dampak penurunan temperature. Diperkirakan dengan ukuran SSSV dan tubing optimum, proses injeksi dapat berjalan dengan lancer tanpa mengalami perubahan fasa, dan secara bersamaan – melalui keberadaan SSSV – melindungi sumur dan fasilitas permukaan kita dari aliran fluida sumuran yang tidak diinginkan, dan akhirnya memiliki ketahanan struktur tanpa mengalami perapuhan atau penurunan kapabilitas terhadap tekanan. Kata kunci: CO 2 superkritis, injeksi, efek Joule-Thomson, subsurface safety valve, penurunan temperatur *) Student of Petroleum Engineering Study Program, Institut Teknologi Bandung, 2023 batch **) Thesis Adviser in Petroleum Engineering Study Program, Institut Teknologi Bandung.