Successful Stimulation of Sandstones in the Dulang Field, Malaysia, Using 
Surfactant-Based Diverter: A Novel Solution for Mature Fields

Ali, Azhar; Hashim, Abdul Hamid; Hashim, Fazil; Said, Rifat; Nair, Devan; Chan, Keng Seng; Samuel, Mathew

doi:10.2523/96309-ms

Cited by 3 publications

(2 citation statements)

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“…This case study is related to an acidizing job on a producing oil well in the Dulang oil field in Malay Basin Malaysia (Ali et al 2005). This is a shaly sandstone reservoir with original oil in place estimated at 700 million STB, and with a crude gravity averaging 39°API.…”

Section: Case No 3: Dulang Oil Fieldmentioning

confidence: 99%

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Automating sandstone acidizing using a rule-based system

Ebrahim

Garrouch

Lababidi

2014

J Petrol Explor Prod Technol

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An expert system for automating sandstone acidizing has been developed in this study. The system consists of six stages, which were built following an acidizing logic structure that is presented in the form of decision trees. The six stages consist of formation oil displacement, formation water displacement, acetic acid, HCl pre-flush, main acid, and over-flush stage. The acid blends recommended by the system are damage-type specific, and account for the compatibility between the injected acid and the in situ crude in order to avoid formation of asphaltene sludge, or emulsions. The acidizing expert system has been implemented as an online web-based application. Applicability of this expert system to acidizing design has been illustrated using three documented actual field cases spanning the Niger Delta region, Algyo Oil field in Hungary, and the Dulang oil field in Malaysia. For Niger Delta field and the Algyo field cases the expert system produced an optimal main acid job design with recommended preand post-flushes that are in perfect agreement with successful field treatment. For the Dulang oil field, in actual practice, an organic clay acid was injected for removing problems of fines migration in a reservoir that has a high calcite content, with a moderate amount of feldspar and chlorite clay. The acidizing expert system recommended a chelant-based acid, which is a recent innovation that is considered a more cost-effective acid solution for dissolving fines in presence of calcite and other sensitive clay minerals.

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Section: Case No 3: Dulang Oil Fieldmentioning

confidence: 99%

“…Stage Six: Over-flush stage: inject 8 % NH 4 Cl. The actual treatment fluid, which was reported by Ali et al (2005), consisted of a 10 % acetic acid pre-flush, an organic clay acid and an organic mud acid as the main acid. The well showed an insignificant production improvement of approximately 100 bbl/day production.…”

Section: Case No 3: Dulang Oil Fieldmentioning

confidence: 99%

Automating sandstone acidizing using a rule-based system

Ebrahim

Garrouch

Lababidi

2014

J Petrol Explor Prod Technol

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Influencing factors of viscoelastic surfactant diverting acid: a review

Du,

Shi,

Liu

et al. 2024

Petroleum Science and Technology

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Successful Use of Multipurpose Vessel for Well Intervention and Stimulation, The Means to Manage Brownfield: Case History

Al-Araimi

Queiros

Chan

et al. 2006

SPE Asia Pacific Oil &Amp; Gas Conference and Exhibition

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The continuous and increasing demand for oil and gas coupled with already recognized Brown Field stage of many of the major producing reservoirs led the operating companies to re-focus their attention on quick incremental production gains to supplement the drilling activity. These conditions promoted the interest for well intervention and stimulation in Brunei. The arrival of a multipurpose rig capable of handling the operating environment facilitated this intervention in the shallow water offshore of Brunei. This paper demonstrates the impact on the so called Brown Field of shifting the focus from field development to incremental production recovery. It will address the importance of vessel and well candidate selection processes, fluid selection and in particular, the well flow back as a critical stage to maximize well performance. Case histories are used to formulate and offer technical process recommendations for well intervention activities with consolidated experience of project undertaken by Brunei Shell Petroleum (BSP) during the Coil Tubing Stimulation campaign of 2004/05, assisted by the multipurpose service vessel BIMA. It discusses the challenges encountered, the advantages of selected operating vessel and its impact on delivering the expected results. Background Brunei Shell Petroleum (BSP) is a company partnered by the Government of Brunei and Shell International and has surpassed 75 years of drilling life and is well into the billion barrel mark of produced oil from over 2000 wells drilled. As most of the wells are maturing, a stimulation campaign is planned to meet the company production targets. Generally the petroleum industry has relatively low focus on production recovery through well intervention and matrix stimulation, compared to drilling new wells. The uncertainty and risk are perceived to be too high to justify the investment on stimulation business in comparison with drilling. An intervention campaign typically requires a detailed study of shut-in, and under performing wells to identify the right candidates for stimulation.1 Potential gaps in well data may increase the uncertainty, and make the choice of the right technique and fluids for achieving the "set out" objective for the production recovery of the well more difficult. The first step and perhaps the most critical one during well intervention is the right candidate selection. This initial process of identifying the right well is very critical for a number of reasons, the most obvious being the classification of the well based on production potential. The study and proposal of the optimum treatment technique to match available economics and resources must also be addressed at the candidate selection stage. Gaps in Well data are the biggest obstacle to the initial stage of well intervention. In many cases this is due to the fact that the well ownership is temporarily transferred to the operations teams (drilling, completion or well services). The details in the Well History File are usually on the completion hardware changes and intervention history. It is quite often that the well data details of the reservoir mineralogy, well testing and production (hydrocarbon and water) data are lacking. Data gaps described above are a result of the well construction focus on field development when the lifting costs are less favorable to the operator. Data gaps are not common-place, however, a single event can and in most cases will, result in failure to achieve the "set out" objective. The expertise required for well intervention activities combined with multi-discipline knowledge base is difficult to be found in a single environment. Bringing together and promoting the collaboration between the different discipline champions from operators and contractors are of paramount importance for achieving objectives.

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Successful Stimulation of Sandstones in the Dulang Field, Malaysia, Using Surfactant-Based Diverter: A Novel Solution for Mature Fields

Cited by 3 publications

References 0 publications

Automating sandstone acidizing using a rule-based system

Automating sandstone acidizing using a rule-based system

Influencing factors of viscoelastic surfactant diverting acid: a review

Successful Use of Multipurpose Vessel for Well Intervention and Stimulation, The Means to Manage Brownfield: Case History

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