Horizontal Well to Optimized Production from Low Quality Reservoir
Tara Puspita Hapsari (a,b), Muhammad Afif Ikhsani (a), Muhamad Ravi (a,b), Rizki Arya Putra (a), Muhammad Taufiq Fathaddin (b*)

a) PT. Pertamina Hulu Rokan, Pekanbaru 28263, Indonesia
b) Universitas Trisakti, Jakarta 11440, Indonesia
*muh.taufiq[at]trisakti.ac.id

Abstract

X Field is one of mature light oil field that being discovered in 1972 and started its first waterflood campaign in 1992 and its first horizontal well campaign in 1998, the field is currently developed from 560 wells with 21 of it is horizontal wells targeted 6 different sands (T, D9, D10, B135 and B150 sand) with low quality reservoir sandstone characteristic. Two of the first horizontal wells is targeted T sand with cemented liner completion added with fracturing job at initial completion, gave cumulative production of 39.44 MBO and 222.36 MBO before being abandon in 2011 and 2021. Other wells consist of 19 wells with 14 of it still being active targeted D9, D10, B135 and B150 sand was completed with open hole liner without having any fracturing stimulation in its life span. Six wells targeted D9 sand is diagnosed having high water cut levels since the first production and currently having low pressure problem that gave average EUR only 46.62 MBO. Other package targeted D10 sand has gradually increased water cut level and still good performance in even low-pressure area with average EUR of 127.63 MBO from 6 wells. The only one horizontal wells with B135 sand as its target has low water cut production even after being produced since 2015 with EUR of 261.41 MBO. Last package of horizontal wells in X Field is targeted B150 sand from 6 wells have good performance with stable production with average EUR of 308.91 MBO. Lookback analysis has been performed with conclusion that the new horizontal well campaign will adopt successful completion strategy with open hole liner with swelling packer to segmentized the well when the segmented section identified as wet zone. Pressure map overlaid with HPT area was modelled to find area of interest combined with swab test from surrounding wells to assure only area with adequate pressure, good oil opportunity and low water cut is continued to drainage area assessment. Last step of the assessment is forecasting using Joshi Equation to determine fluid production capability then using water cut and decline trend of analog wells, EUR of proposed wells can be estimated.

Keywords: Horizontal well, Low quality reservoir- Opportunity assessment- Completion strategy- Joshi Equation

Topic: Engineering