Well N-1 in Mahakam Sisi Nubi field, East Kalimantan, had a problem with water and condensate production up to 11,000 BLPD which instantly rendered the production facility overwhelmed despite the high 34 MMSCD gas rate. To solve this, reservoir production profiling using production logging tool was first carried out. Selection of existing zone isolation method was then compared, yet none satisfies the challenges in this well due to restriction and cost issues. A relatively new technology, High Expansion (HEX) Straddle Packer, was introduced as another alternative. A series of engineering design and followed by operation design was then carried out to solve the well problem safely. A dummy tool run with 2.875" OD and 30ft of length passed through the restriction safely. Caliper logging observes reduction in tubing ID from 3.9" to 3.0". Temperature of the borehole reached 115 deg C at 3417 mBRT of this well. The two water producing zones were next to each other with a total top reservoir to bottom reservoir length of 11 m. With these values, a custom 2.7" straddle packer was built and tested to required temperature and passed. Production simulation with 0.7" ID, indicated the well could still flow over its critical flow regime. After installation, the well flows with 11 MMSCFD of gas with ~1800 BLPD liquid produced, a 83% reduction over previous liquid flowrate. Despite the well flows only 30% from initial gas rate, this well can now flow at an acceptable liquid rate. The successful installation of the first HEX Straddle expands the portfolio of mechanical water shut off methods in Mahakam and in Indonesia as this was the first HEX Straddle installed in Indonesia. Further study and replications are needed, yet this method can be a viable alternative if other has failed for wells with similar problems.

A case study of hydrocarbon prospect evaluation in north Exito field by using seismic attribute and seismic inversion

Nowadays oil and gas industry are encouraging the independents and majors to take a fresh look at the technology and concepts required to develop marginal shallow water fields using a minimal platform approach. Innovation on well intervention means (lighter, smaller and less footprint) that fit for Offshore Minimalist Platform (OMP) is needed, including optimizing time and cost during well intervention activities in OMP. To achieve the objectives, well intervention innovation and technology are the main focuses. Intervention activities commonly done on campaign basis with several units (slickline, wireline, coiled tubing, testing) shall be integrated in a safe manner. The approach of integration shall signify these points:Identifying potential jobs in OMP to be done by well intervention methodsIdentifying necessary well intervention means and methods to support the jobs (combo unit, micro coil, hazardous zone redefinition, remote operation)Creating project planning and schedulingPerforming site visit and risk assessmentImplementation and operational executionEvaluation of overall project execution result The following results were obtained after the integration performed:No major safety issues during operationExemplary method and risk assessment for well intervention activities which can be applied for next campaignsTrials on well intervention new units and method (combo unit, micro coil, hazardous zone redefinition, remote operation), were safely performed with some optimization100% success ratio60% on supply boat arrangement35% efficiency in N2 consumption for CT operation45% efficiency in diesel consumption20% - 40% efficiency in Rig Up Time28% less in Job Cost compared to conventional unit These innovations are proven as reliable method to answer OMP challenges with main advantages on footprint and cost optimization. Through this paper, we would like to share lucrative well intervention breakthrough and innovation in OMP with measurable milestones.

The objective of this paper is to present the Mechanical Water Shut-Off (MWSO) strategy for multilayer reservoirs on tubingless well. With 10 open perforated reservoirs and no selectivity option, isolation on water producing reservoir will be the main challenge since production is commingled throughout the lifetime of well. Regular production tests performed through a Multiphase Flowmeter equipment on each offshore platform is a first indicator to monitor the evolution of water production in a well. JM-X well has been experiencing water breakthrough since one week after initial perforation and WGR keep increasing following gas production decline. The strategy was initiated by conducting a bottom hole monitoring survey to identify water sources. Production Logging Tool (PLT) was used to precisely monitor pressure, temperature, water holdup, and fluid rate along the wellbore for further water source and production allocation analysis. Once the water source reservoirs have been identified, MWSO operation was requested. There are several types of MWSO equipment that are commonly used in Offshore Mahakam field each of which has selective economic consideration based on the expected well reserve. Considering operation difficulties and cost, MWSO program was made then will be monitored during the operation time to ensure the operation runs safely and smoothly. MWSO strategy on well JM-X was proven to be able to reduce water production from 900 bpd to only 20 bpd with a significant gain of gas production from 3 MMscfd to 9.2 MMscfd and oil production from 200 bpd to 750 bpd.

ABSTRAKSaat ini masih banyak orang yang melakukan pemetaan 2D, tetapi seiring berkembangnya teknologi pemetaan secara 3D mulai dikembangkan. Pada studi ini kegiatan pemetaan dilakukan dengan metode terestris dengan melakukan pengukuran sudut dan jarak untuk mendapatkan posisi berupa x, y, z dan data keruangan berupa panjang, lebar, dan tinggi. Pada studi ini, pemetaan 3D lebih dikembangkan dengan melakukan pengukuran metode terestris dengan menggunakan alat Electronic Total Station (ETS). Namun, tidak semua objek dapat diukur menggunakan alat ETS, dikarenakan wilayah pengukuran terletak pada daerah yang padat dengan bangunan gedung sehingga membatasi ruang gerak pengukuran. Dari hasil studi ini dapat disimpulkan sebagai berikut: (1) pengambilan data detail situasi tidak hanya mengambil batas-batas atap dari setiap objek, melainkan setiap detail objek-objek seperti pilar, pintu, jendela, tangga, atap, rangka atap, ventilasi; (2) titik-titik detail situasi yang diukur adalah sudut-sudut dari setiap detail objek di mana titik-titik detail situasi yang diukur menggunakan metode seperti metode polar dan metode trigonometri; (3) data detail situasi yang diolah adalah posisi vertikal (z) untuk mendapatkan beda tinggi. Beda tinggi tersebut digunakan untuk penggambaran objek 3D; (4) peta 3D yang dihasilkan sesuai dengan posisi, ukuran, dan bentuknya.Kata kunci : Pemetaan 3D, ETS, Level of Detail, Metode TrigonometriABSTRACTCurrently there are many people who do 2D mapping, but as the development of a 3D mapping technology was developed. In this study mapping exercise carried out by terrestrial methods by measuring the angle and distance to get the position in the form of x, y, z and spatial data such as length, width and height. In this study, the 3D mapping is developed by measuring the terrestrial method by using the Electronic Total Station (ETS). However, not all objects can be measured using the ETS, because the measuring region lies in a dense area with buildings that limits the space of measurement. The results of this study can be summarized as follows: (1) retrieval of detailed data of the situation not only take the roof boundaries of each object, but every detail of objects such as pillars, doors, windows, stairs, roof, roof truss, ventilation; (2) the detail points of the situation measured are the angles of each detail of the object in which the detail points of the situation are measured using methods such as polar methods and trigonometric methods; (3) the processed data of detail situation is vertical position (z) to obtain a height difference, which used for 3D object depiction; (4) the resulting 3D map matches the position, size, and shape.Keywords: 3D Mapping, ETS, Level of Detail, Trigonometry Method