Lukeqin Heavy Oil Gas Stimulation Test And Application Effect Evaluation

LuKeQin Heavy oil enrichment regional tectonic position with in turpan faulted reservoir HuoYanShan central thrust belt footwall, area of17.46km2proven oil, level3reserves totaling14901x104t. Wage-earners crook oil from the west to the east, the west is divided into central, eastern three blocks, reservoir depth in turn uplift, the eastern reserves proven not, not currently use; The central has injected scale development, is the oil field is the main oil-producing areas; The west’s proven reserves, but reservoir physical properties relatively poor central region, the single well output low, belongs to use area. Heavy oil reservoir are deeply buried, crude oil viscosity is high, the reservoir conditions are relatively poor, for loose sandstone reservoir, but a rich reserves. Rely on natural energy development, supporting shaft mixed with thin oil viscosity lifting rod pumps, fluid of reservoir with poor liquidity, low yield of single well. Be well depth limit, the most effective in the hot heavy oil development at present in the way to realize the wage-earners crook oil field. In2003, in room temperature water injection central pilot test, and in2008the central thoroughly water injection development; Indoor test and evaluation indicates that the water injection development effect of heavy oil note cold water development low recovery, about13%-19%. Through the domestic and foreign research and indoor experiments to prove, gas stimulation can greatly reduce oil viscosity, increase the single well production, to enhance oil recovery.Foreign heavy oil gas injection with nitrogen and carbon dioxide main stimulation is given priority to, oil reservoir pressure by wage-earners crook, the nature of the crude oil limit, cannot undertake nitrogen phase of mixed flooding; The influence of air source by oil region, to realize the throughput of carbon dioxide. Domestic zhongyuan oilfield1983-1989in the complex fault block reservoir (thin oil, to take off the gas oil viscosity1-5mP·s) carried out the note natural gas production technology research and steam in the test and has a good effect, can carry out LuKeQin Heavy oil for natural gas stimulation mining trials some guidance.ZhangZhiDong, Zhaojian tuba oilfield, for wage-earners crook deep buried depth, heavy oil reservoir oily thick characteristics, puts forward a scheme of natural gas stimulation. Through the indoor physical simulation that the natural gas stimulation of natural gas development in addition to conventional steam development the dissolution of the viscosity, the most important is the mechanism of heavy oil gas injection there after to bubble point, so as to form the bubble dispersed oil viscosity reduction. Natural gas stimulation process, from the bottom of the well to the formation far end, the stratum in turn divided into supersaturated area, saturated zone and owe saturated zone, and, on this basis, promotes the pilot test, and achieved good results. LuKeQin Heavy oil gas stimulation test and application results at home and abroad, is still in the first, for the development of heavy oil provides new technology; Form the crook of heavy oil note natural gas stimulation wage-earners deep gas injection system and related parameters technique and the ground gas injection system; The water injection development block gas stimulation effect than failure type development block; LuKeQin Heavy oilgas stimulation effect evaluation showed that the average daily oil well early to4t/d above, average single well valid for3-5months; Many rounds after natural gas stimulation, but through developing fine water injection and gas water alternate flooding to improve throughput effect.Research ideas:first by the single well as the foundation, reservoir with dynamic and static data, the deep analysis of the four batches gas injection well stimulation production increase of cause and effect stimulation effect major controlling factors. Make clear formation pressure, reservoir physical properties conditions, properties, such as crude oil formation and fluid properties, the stimulation effect. According to the reservoir heterogeneity characteristics, basic design based on gas injection parameters, determine the single well reasonable note of air, soak cycle, gas injection cycle and note gas speed. The high water note natural gas containing the central throughput effect, formed a set of suitable for LuKeQin Heavy oil development of natural gas stimulation supporting technology implementation of note.The project mainly on the implementation is given priority to, indoor test subsidiary. Indoor test is mainly according to the various parameters and implementation effect of indoor model correction and fitting, get the best gas injection parameters, choose the best gas injection timing, and to get the most amount of oil and a maximum economic benefits. The scene in the process of implementation of the construction difficulty bigger, safety risk is high, the operation process is complicated, and there is a big underground geologic anisotropic and uncertainty, the implementation has certain risks. Set up a perfect gas injection process of heavy oil well production shall be the ground of the existing process of reform of the scale. Note gas stimulation effect increased oil Wells differences, gas injection pressure, soak cycle, gas injection form in former well on the effect of the gas injection stimulation is unclear, the water injection development block, there is no note gas stimulation test. Note gas stimulation can achieve good effect increased oil viscosity, but to complement and recovery of formation energy small contribution, how can keep that formation energy and can give full play to its viscosity increased oil well production is greatly increased role gas injection stimulation achieve sustained increase of the main difficulties.The main problem solving:note gas stimulation parameters of the unity of the design standards, especially the same note of air, gas injection speed, soak cycle, gas injection cycle in different oil Wells on a method to determine the; Design double the packer and solve the stimulation of hang after a production pressure well channel; Complete the jet recycling equipment process design put; Note gas stimulation and normal production and integration string design, reduces the hang of long hours and well pumping of production; Water injection application block gas stimulation; Through the fine water injection and water alternate flooding can effectively increase the steam throughput effect after many rounds.Complete the preparatory four batches gas injection well stimulation18mouth the implementation effect evaluation and analysis of influence factors. Complete note gas stimulation parameters optimization and gas injection timing of laboratory and field application evaluation. Complete wage-earners water injection development block central aruk the note gas stimulation feasibility analysis and2010-2011, the proposals. Formation and perfect LuKeQin Heavy oil note gas stimulation mining supporting technology.Innovation points:1, the natural gas stimulation LuKeQin Heavy oil to improve oil recovery methods;2, the single well gas injection parameters design standards of heavy oil and water injection development of high water cut period note block gas stimulation technology;3, injection-production integration shaft can be pressed string design and application technology well;4, heavy oil note natural gas stimulation necessary technology ground;5, gas water alternate flooding to improve oil recovery technology.