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Abstract The Oil Industry is actively involved in screening new technologies to solve a common problem: to reduce capital expenditures as well as to minimise environmental impact. Budget reduction has forced several Oil Companies to identify new solutions: for example, in onshore applications, slim hole drilling has been recently seen as a suitable tool for cost reduction In a variety of applications such as frontier basins and prospect evaluation, reentries, production from marginal fields and so on. An overview is presented on low cost drilling for marginal fields production in mature areas. In relation to this particular scenario, appropriate technologies have been investigated with the above aim. An innovative drilling rig. particularly tailored for marginal fields development, is presented in the paper along with the preliminary results of field applications. Introduction The project features and the relevant technical solutions have been identified considering the current company scenario, consisting of minor gas fields in mature areas. The reservoir size is typically up to a few hundreds million m3 of gas; vertical depth usually ranges from 1300-2500m. Expected production rates are from 50-70.000 m3/d (max 120.000); water production is possible, whilst sand production, temperature and sour gas do not create any particular problem. The total number of prospects is remarkable: some 60-80 have been identified over the years, but no development has been considered. The profitability is critical using standard rigs and technology and also strongly depends on existing nearby facilities. Generally speaking, 300 million m3 is close to the limit for economical exploitation using standard technology. With such constraints technical innovations must be found in order to enhance marginal field profitability. It is commonly believed that only an overall approach could give good results. This means that particular attention must be paid to:–well downsizing –footprint reduction –fast moving concepts –reduced personnel and rig automation –minimum waste production –integration of services (i.e. cementing data acquisition etc.) P. 475
- Europe (0.95)
- North America > United States > Texas (0.28)
Reliability Methods Applied to Drilling Operations
Ligrone, Angelo (Agip S.p.A.) | Botto, Giovanni (Agip S.p.A.) | Calderoni, Angelo (Agip S.p.A.)
SPE Members Abstract Managing drilling operations requires a careful and skilled use of all the information available. In most cases, the information is processed by statistical methods. However, sometimes there is the risk of neglecting some part of the information, thus biasing the decision-making process. In our opinion, the reliability approach can overcome this problem. This paper aims at showing how it is possible to effectively manage the performance of the drillstring by constantly monitoring the reliability of every single drillstring component. Introduction Approaching the end of the 20th century, operators are under stress to reduce costs related to field operations, whilst hydrocarbon E&P moves towards the exploitation of more risky and difficult reservoirs. Reliable technology and its skilled use can meet these requirements. Once this statement is accepted, two - non mutually exclusive - paths can be suggested.To provide, new, high-level technological standards. To optimize use of the available technology. Although in the past the former solution seemed to be the one widely practiced by operators, current trends force them towards the latter option. This means that the reliability of the technology should be constantly monitored and, if it is not deemed satisfactory, corrective actions should be taken. In the following, we will be introducing the reliability of items, and therefore it is worthwhile giving a definition of reliability. Reliability has two connotations: one is probabilistic and the other is deterministic. In this work we will be with dealing the former aspect and define reliability of an item as its ability to operate under designated operating conditions for a designated period of time. According to what was previously stated, the ability of an item will be designated as a probability. Case history The analysis focuses attention on failures which occurred during the drilling of some HTHP deep and ultra-deep wells in the Po Valley, Italy. The operating conditions were challenging. The two reservoirs were located at a depth of between 5,500 m and 6,500 m. Temperatures over 180 C and pressures over 1,000 bar were measured downhole. P. 227
- Europe (0.48)
- North America > United States (0.47)