Handil field is a giant mature oil field in Indonesia. It’s been producing since 1975, being the current recovery factor for oil 49% and 57% for gas. Cumulatively, the total oil produced is around 855 MMstb and gas around 1.68 Tcf. Today, oil is being produced at 20,000 bopd, gas at 75 mmscfd and water at 130,000 bwpd. Enhanced oil recovery projects, infill wells and light workover of existing wells are key elements to maintain field production. This paper describes an innovative light workover intervention, called Annular Squeeze Cement that helps keeping Handil field production performance at its best level. It covers the field study analysis that led to this the technique, some precautions and current challenges concerning the cementing operation as part of light workover activity. It also share lessons learnt from the field execution and evaluation. A case study is also presented for a full understanding how this cementing placement technique contributes to the field performance. This technique was successfully implemented and acts also as one of the important element to extend the life of a giant mature field where economic and success ratio becoming a paramount parameter.

After decades of field and laboratory studies, when compared to primary cementing, squeeze cementing defies standardization as a general practice. Each candidate for remedial cementing presents a unique challenge to the engineer, therefore, to address the variety of problems that may occur, a wide range of techniques has been developed combining placement methods, specific slurry formulations, and execution procedures. Recent advancement in workover techniques in brown fields which requires well intervention without pulling out or replacing the existing completion mostly for economic reasons, have added extra complications to the remedial cementing operations that makes the job success more challenging. It is a multidisciplinary field requiring knowledge and skills in geo-mechanics, fluid mechanics, and of course, cement-slurry systems. Handil field is a giant mature oil field in Indonesia that has been producing since 1975 with the current recovery factor of 49% for oil and 57% for gas. Cumulatively, the total oil produced is around 855 MMstb and gas around 1.68 Tcf with the current production of oil at 20,000 bopd, gas at 75 mmscfd and water at 130,000 bwpd. Applying enhanced oil recovery techniques, infill well drilling and light workover operations performed on existing wells are key elements to maintain field production. This paper outlines the field study analysis with the focus of improving the squeeze cementing success rate from the previous campaigns and will cover innovative solutions specially a novel placement technique that was adopted on a recent campaign. Successful results helped the operator to extend the life of the mature field by maintaining the production at its best level. Also a case history will be covered for the aim of better understanding the challenges being faced for properly isolating the compartmentalized sand reservoirs with different characteristics where proper analysis and innovative approach helped the operator achieving the objectives.

No abstract

TX 75083-3836, U.S.A., fax +1-972-952-9435. AbstractGas fields in the Mahakam Delta are the most prolific in Indonesia. TOTAL E&P Indonesia operates Tunu, Tambora, Handil, Peciko, Bekapai and Sisi Nubi fields. To meet the increased production requirements while enhancing economic development, the operator is reducing drilling costs as much as possible. Slim hole well is the optimal gas well configuration being applied in Tunu and Tambora fields. The slim hole design diminishes the size and number of casing strings to produce the low pressure gas reserves economically.The latest well design, known as the light slim hole well, reduces the number of casing strings from previously four, to become three strings: conductor, surface, and production tubingless. In light slim hole well, the 24-in. conductor casing is hammered to 130 m depth, similar to the previous design. The 9 5/8-in. surface casing is set at 1,300 m TVD. The well then is completed with 4 ½-in. production tubing, which is set at around 4,000 m TVD.Like all gas wells, light slimhole requires adequate zonal isolation along the production section. Cement sheath failure will result in sustained casing pressure and, in the worst case, loss of the well. A long open hole section has to be cemented from bottom across the production zones to 300 m above surface casing shoe. Placing a nearly 3,000 meters column of cement slurry along production casing is therefore one of the most challenging operations done on the well.The long cement column translates into large temperature differences between the bottom hole and the top of cement and high circulating pressure during slurry placement. In this case, the temperature difference can reach 90 degC [162 degF]. Design and selection of the cement slurry requires specific and tailored approach to ensure the cement sets uniformly along the long column, ensuring proper zonal isolation. By using advance software resources, the temperature of the cement particle is analyzed precisely during the cement placement. This paper outlines cement design approach for this long section hole, describes the overall cementing process, and shows field results of light slim hole wells in the Mahakam Delta.

No abstract