The Jade Fieldi sl ocated inBlock 30/2ci nt he UK CentralNorthS ea andwasdiscovered byw ell 30/2c-3in1 996. Itw ast henappraised byw ell 30/2c-4 in1 997,withfi rst production in2 002. The decision to develop the fieldafteronly oneappraisalwell led to adegree ofuncertainty inthe fieldreservesandestimated production profiles. Consequently,the development programmewasdesigned to include anelement off urther appraisal. The development planincluded simultaneous drillingandproduction operationssoreservoirpressure depletion,dueto production,wasrecognized asasignificant projectchallenge.Detailed contingencyplans were formulated to ensurethatwell objectiveswereachieved, despitethe potentially problematic reservoirconditions. The fieldproducesgasandc ondensatef rom the Triassic Joannea ndJ udySandstonesandi sclassified asa high-pressure, high-temperaturefield, withawetgas-in-place estimatefor the JoanneSandstoneofaround1000 BCF andfor the JudySandstoneof150BCF.Thispaperoutlinesthe petroleum geologyanddevelopment history ofthe fieldandthe current understandingofthesecomplexreservoirs.
We present experimental results on three dynamic properties of very strong double layers observed in a triple plasma device. First, it is observed that when an inductance of sufficient size is inserted in series with the external bias supply used to produce the double layer, disruptions in the plasma current occur accompanied by disruptions in the double layer potential. Second, it is observed that with all external reactances reduced as much as possible, a sort of jitter-motion occurs in the position of the double layer around its equilibrium position. Third, when the external bias supply is pulsed, the initial potential distribution is observed to have an essentially uniform slope, as in the case of a vacuum capacitor. The disruption phenomenon may be explained in terms of the behavior of the potential structure as a function of the bias voltage and this explanation is discussed along with the experimental evidence for its validity. A comparable understanding of the other two phenomena has not been achieved, but in both cases there are qualitative differences between the behavior reported here and what has been observed in Q-machines and these differences are discussed.
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