火烧辅助重力泄油矿场调控技术

发布时间：2018-08-16 08:16

【摘要】：基于火烧辅助重力泄油(CAGD)技术的机理、技术优势和缺陷,研究CAGD矿场调控的目标、策略和方法。CAGD技术充分利用重力作用,让燃烧前缘高温可动油就近流入水平生产井中,使火烧油层开发超稠油油藏成为可能,但在矿场应用过程中易于发生燃烧带前缘单向锥进和火窜。通过室内三维物理模拟实验,并借鉴以往矿场试验的经验,指出平缓上倾的燃烧界面有利于实现连续稳定重力泄油,矿场实践中应以该形状为调控目标;经油藏工程及物质平衡计算,给出了CAGD矿场实践过程中能实现的最大产量和对应的注气速度,对于新疆风城超稠油油藏,CAGD最大目标产量为12.9 m~3/d,对应的注气速度为14 048 m~3/d。为实现上述调控目标,CAGD生产过程中应保证起火位置在油层中上部,点火初期保持低速注气并缓慢提速,同时控制烟道气产出速度为注气速度90%左右。研究成果应用于新疆风城CAGD先导试验中,取得了较好的开采效果,截至2016年底FH005井组已实现稳定重力泄油400 d,燃烧腔体发育形状、水平井单井产量、空气油比以及原油改质等指标均符合方案预期。
[Abstract]:Based on the mechanism, technical advantages and disadvantages of (CAGD) technology, the aim, strategy and method of CAGD field control are studied. It is possible to develop super heavy oil reservoir in burning reservoir, but it is easy to occur one way coning and channeling in the front edge of combustion zone in the application of mine field. Based on the three dimensional physical simulation experiment in laboratory and the experience of the previous field test, it is pointed out that the flat upward combustion interface is conducive to the realization of continuous and stable gravity oil discharge, and the shape should be taken as the control target in the field practice. Through reservoir engineering and material balance calculation, the maximum output and gas injection velocity can be realized in the practical process of CAGD mine field. For Fengcheng super heavy oil reservoir in Xinjiang, the maximum target output is 12.9 m ~ (3 / d) and the corresponding gas injection velocity is 14 048 m ~ (3 / d) / d. In order to achieve the above control goal, it is necessary to ensure that the fire is located in the middle and upper part of the reservoir during the production of CAGD, that the low speed gas injection is maintained and the speed of gas injection is increased slowly at the initial stage of ignition, and that the output rate of flue gas is controlled at about 90% of the gas injection rate. The research results have been applied to the CAGD pilot test in Fengcheng, Xinjiang, and good recovery results have been obtained. By the end of 2016, the FH005 well group has achieved stable gravity release for 400 days, the combustion chamber has developed, and the single well output of horizontal well has been achieved. Air-oil ratio and crude oil upgrading and other indicators are in line with the program expected.
【作者单位】：提高采收率国家重点实验室;中国石油新疆油田公司;
【基金】：国家科技重大专项“火烧驱油技术研究与应用”(2011ZX05012-002)
【分类号】：TE357.44

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