Isnu Daryanto

EVALUASI MASALAH KEPASIRAN DAN WATER CONING PADA SUMUR MINYAK VERTIKAL, LAPANGAN “ID”, KALIMANTAN TIMUR

Introduction

Evaluasi masalah kepasiran dan water coning pada sumur minyak vertikal, lapangan “id”, kalimantan timur. Evaluasi masalah kepasiran & water coning pada sumur minyak vertikal di Lapangan 'ID', Kalimantan Timur. Analisis data produksi, laju alir kritis & breakthrough time untuk optimasi perolehan minyak.

Abstract

AbstrakKelebihan produksi air dan pasir merupakan salah satu masalah yang umum dalam memproduksikan minyak bumi. Analisa terhadap masalah ini kemudian menjadi asset berharga dalam memaksimalkan usaha perolehan minyak bumi. Berangkat dari alasan tersebut, penulis mengajukan penelitian masalah kepasiran dan water coning di Blok Sanga-Sanga, Kalimantan Timur. Analisa yang berupa evaluasi ditargetkan pada reservoir dengan limitasi seperti karakteristik reservoir lensa dengan lingkungan pengendapan delta yang dibor secara vertikal menembus beberapa reservoir minyak bumi. Dimana, secara umum reservoir yang ada adalah batuan pasir yang memiliki drive mechanism kombinasi yang didominasi Water Drive.Untuk masalah water coning dilakukan pengamatan terhadap data produksi, khususnya water cut dimana kenaikan yang signifikan merupakan ciri terjadinya water coning. Kemudian, dilakukan Chan’s Diagnostic Plot dengan membandingkan WOR/WOR’ terhadap waktu yang akan dianalisa lebih lanjut dengan perhitungan laju alir kritis. Dari hasil plot tersebut, nantinya akan dapat dibedakan mana sumur yang mengalami water coning atau water channeling. Hasil tersebut akan divalidasi dengan perhitungan laju alir kritis. Ada beberapa metode yang digunakan dalam perhitungan laju alir kritis sumur vertikal, yaitu Metode Meyer-Garder, Metode Schols, Metode Chaperson, Metode Hoyland-Papatzacos-Skjaeveland, Metode Chierici-Ciucci dan Metode Chaney dkk. Jika laju alir produksi atau aktual berada diatas laju alir kritis maka dapat dipastikan reservoir mengalami masalah water coning. Terakhir, akan diperkirakan breakthrough time melalui metode Sobocinski-Cornelius.Kata kunci: Water coning, Water Channeling, Laju Alir Kritis, Breakhthrough Time, Masalah Kepasiran. AbstractOverproduction of water and sand is one of several common issues in producing oil. Analysis towards this problem becomes a valuable asset in maximizing oil recovery. Based on this reason, writer pursues research of sand problem and water coning at Sanga-Sanga Block, East Kalimantan. Analysis as the evaluation is targeted on reservoir by certain limitations such as lenses reservoir characteristic with deltaic precipitation environment which was drilled vertically through several reservoirs. In general, the reservoir is sandstone which has combination drive mechanism which is dominated by water drive.Then, calculation is held towards critical rate that will be further analyzed with Chan’s Diagnostic Plot by comparing WOR/WOR’ versus time. From the plotting, later we will able to differentiate which well encountered water coning and/or just water channeling In water coning analyses, observation was done towards production data, spesifically water cut where significant rise marks the existence of water coning. Then, Chan’s Diagnostic plot was conducted by comparing WOR/WOR’ to time which will be analyse in advance by the critical rate. From the plot, later on will be able to differentiate wells that experienced water coning or water channeling. The result will be validated with the critical rate calculation. There are several methods on calculating critical rate in vertical well, which are Meyer-Garder Method, Schols Method, Chaperson Method, HoylandPapatzacos-Skjaeveland Method, Chierici-Ciucci Method dan Chaney et al Method. If production rate or actual rate over the critical rate then it divined the existence of water coning in the reservoir. Last, by the method of Sobocinski-Cornelius will be calculated the breakthrough time. Keyword: Water coning, Water Channeling, Critical Flow Rate, Breakhthrough Time, Sand Problem.

Review

This manuscript proposes an evaluation of sand production and water coning issues in vertical oil wells, specifically targeting the "ID" field within the Sanga-Sanga Block, East Kalimantan. The problem of excessive water and sand production is a critical challenge in petroleum engineering, significantly impacting oil recovery and operational costs. The research is focused on analyzing reservoirs characterized by a lenticular sandstone formation, deposited in a deltaic environment, exhibiting a combination drive mechanism primarily dominated by water drive. This focus on practical field problems makes the study highly relevant for optimizing oil recovery strategies in similar geological settings. The methodology outlined for addressing water coning is quite comprehensive. The authors intend to utilize production data, particularly significant increases in water cut, as an initial indicator of coning. Further diagnostic analysis will involve Chan’s Diagnostic Plot, comparing WOR/WOR' against time to distinguish between water coning and water channeling. This will be rigorously validated through critical flow rate calculations using a variety of established methods, including Meyer-Garder, Schols, Chaperson, Hoyland-Papatzacos-Skjaeveland, Chierici-Ciucci, and Chaney et al. The core criterion for confirming water coning will be when the actual production rate exceeds the calculated critical flow rate. Additionally, the study aims to estimate the breakthrough time using the Sobocinski-Cornelius method, providing crucial information for proactive management. While the proposed methodology for water coning is robust and detailed, a notable limitation arises regarding the "masalah kepasiran" (sand problem), which is prominently featured in the title, objective, and keywords. The abstract, however, provides no specific methods or analyses for evaluating sand production. This omission is significant, as a comprehensive evaluation of both problems as suggested by the title would require dedicated methodologies for sand quantification, prediction, or mitigation analysis. Despite this, the detailed approach to water coning, employing multiple diagnostic and predictive tools, demonstrates a strong potential to yield valuable insights for reservoir management. Should the final work address the sand problem with similar rigor, it would significantly enhance the practical contribution of this research to maximizing oil recovery in the specified field.

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