›› 2017, Vol. 38 ›› Issue (6): 1-1.doi: 10.7657/XJPG20170619

   

Application of Static and Dynamic Data in Identification of Carbonate Reservoir Type: A Case Study from Ordovician Strata in Jinyue Block of Halahatang Oilfield, Tarim Basin

DAI Feixu1a, ZHU Baiyu2, DENG Bolong1b, LIU Yuan1c, HAN Yu3, XIAO Hua1a   

  1. (1.PetroChina Tarim Oilfield Company, a.Middle Tarim Oil & Gas Development Department; b.Development Department; c.Oil and Gas Engineering Research Institute, Korla, Xinjiang 841000, China; 2.School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China; 3.No.2 Oil Production Plant, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736200, China)
  • Online:2019-01-01 Published:1905-07-18

Abstract: Based on the the static and dynamic data from single wells in Jinyue block and its neighboring areas of Halahatang oilfield, the paper analyzes response characteristics of different reservoir space types on the static and dynamic data comprehensively, presents quantitative and qualitative classification standards, establishes identification templates and analyzes reservoir distribution in the study area. It is considered that compared with fracture-vuggy reservoir, the leakage of drilling fluid in cavernous reservoir is relatively large, showing a non-flowback feature; during acid fracturing, pump pressure drop is large, pump stopping pressure is low, the pressure drop curve is a horizontal line when pump stops and the flowback rate of acid liquid is low. The production test data shows that the tubing pressure is high with high daily liquid yield and slow decline, and sufficient formation energy allows a long oil flowing production period at the early stage. According to cavity assemblage, cavernous reservoir can be divided into 2 types, i.e., single cavity and multi-cavity reservoirs. Multi-cavity reservoir has multiple connected fractures and cavities, its pressure drop vs. cumulative liquid production curve exhibits multisegments of straight lines whose slopes are different; the yield shows a multi-stage decline and the pressure derivative curve shows multiple concave shapes. For single-cavity reservoir, the pressure drop vs. cumulative liquid production curve is a straight line, the tubing pressure and daily oil production reduce with the decline of natural energy and the pressure derivative curve goes upward after radial flow stage.

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