Dagang oilfield belongs to typical multi-layer system, heterogeneity of complex fault block reservoir, reservoir and the large difference of physical property of crude oil, water, etc, the longitudinal permeability difference is obvious, separate injection interval is not detailed, The existing bridge eccentric note, bridge concentric injection technology can’t meet the needs of the fine water injection, real-time measurement and control because of drift, well depth, pressure and other factors, and there is poor adaptability, measuring problem of long time and low efficiency. Cable type fine intelligent water injection technology in underground intelligent water distributor, the ground controller as the core tools, cable as transmission medium, the computer network communication technology, intelligent control technology combined with oil field water injection demand, developed a new and reliable water injection system, realized the layered injection allocation under different deviation, full automatic control and monitoring data, and direct reading test. The technology in the implementation of 5 Wells in dagang oilfield, the implementation of maximum deviation 80 °, the maximum depth of 3661.52 m, the highest water flooding pressure 25 mpa, construction success rate reaches 100%, downhole test times 5 Wells, inspection accuracy of 100%. The results show that the cable type intelligent water flooding technology can not only realize downhole data real-time monitoring, real-time traffic regulation, and can complete the packer direct reading test, and the measurement process is reliable and efficient, at the same time solve the high Angle well, horizontal well can’t test the technical problem, provides the high Angle well, horizontal well fine water injection technology support.
SHAD oilfield, located in one of the fields with the highest onshore production in the Middle East; more than 70% of its production wells are flowing wells, with an average single well production capacity of more than 3000 bbl/d. Its main oil production formation is loose sandstone reservoir. The completion style of its production wells are generally completed casing perforation, and sand production is obvious after a period of exploitation. In the process of production, sand cleaning and sand discharging are often needed in the perforated section of oil well; however, after 3-5 years of production, serious sand burial still forces developers to give up the original production formation. In addition to the problem of sand production, there are many complex layers, some of them are oil-water layer, and the increase of water in the liquid production gradually affects the well flowing. Fishable and sectional expandable sand screen (ESS) completion technology is developed to deal with sand production and the increase of water production. The upper of the original production formation of the old wells is as the new production formation. The new formation is divided into several sections due to different physical properties. Perforation is carried out at the same time for all sections. After this, each the ESS completion string is run into each section. The top sealing hanger and the bottom packer will seal each ends of the annular between ESS and perforating casing, thus to form independent production section. In later process of production, plugging tools is run for sections if needed, so as to realize selective open/ close of different sections. Special fishing tools are developed, combined with the mechanical plastic characteristics of ESS, which can realize the fishing of the completion string. This solves the problem of fishing long string, and provides good conditions for subsequent operations. The research results show that two good results are obtained. One is that arranging several sections of ESS completion strings in the old well bore gives full play to the characteristics of ESS with strong flow capacity, good sand control effect, and is suitable for sand control in high-yield wells. The other is that selective open/close is realized for different sections which meets the sand control and production needs of in SHAD oilfield. The research results have applied to 9 wells in SHAD oilfield, and the success rate is 100%. Among them, one single well is divided into three sections, and the production is stable, the sand production is near to 0, and the sand control effect is significant. The successful application of this technology fills up the gap of multi-stage ESS completion in the Middle East.
With its advantages of a shorter construction period, a less cost and a higher production, multilateral drillingtechnology has become widespreadthroughout the petroleum industry. Multi-stage hydraulic fracturing technology is also widely used in the field to deal with poor reservoir conditions such as layers with low pressure and permeability. However, conventional hydraulic fracturing technology used in multilateral well encounters difficulties. Not only has itcalled for a complicated operation of accurate re-entry, but also significantly extends the completion time while having to controlthe well, thus greatly increasing the risk of making a dead well and limiting the development of the technology. In order to deal with those difficulties, the authors of this study researched this new technology which can achieve the goal of self-orientating control, accurate re-entry control and fracturing multilaterals without having to controlthe well. The first aim is to achieve the goal of a single trip self-orientating control system during drilling different multilaterals, thus means drilling tools will enter the lateral we choose only by the self-orientating control system while without any other tools or instruments in this process. To get this, a self-orientating system is studied which provides a base for subsequent operations and it is kept at the bottom of the hole perpetually. In other words, the self-orientating control system functions as the root of the whole system. The other aim is to achieve the goal of selective re-entry. During the processes of washing and fracturing, the BHA must re-entry the lateral designed, thus a special tool is needed to work as a guide to lead the BHA into the right hole. The special tool we designed is called junction. It works as a bridge between the bottom lateral hole and the running BHA. The re-entry system will enter the hole selectively based on the mechanical parts onthe junction. The last but the most important is to fracture the multilaterals together without having to controlthe well. Compared with conventional operation, fracturing/killing/bridging operationsare not needed for the lower lateral before starting to drill the upper lateral, thus not only one trip has been decreased, but also no risk to lead to a dead hole. A Fieldtest has been performed on an abandoned well, showing the success of the technology. Special tools and operation procedures were involved. The two laterals were fractured only in one trip which demonstrates its superior performance compared to conventional multi-stage hydraulic fracturing that requires two or more trips for multilateral wells.
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