According to the industry standard, low permeability and tight reservoir are highly stress-sensitive in laboratory tests. However, this phenomenon has not been effectively confirmed in the field production test. For this reason, a method to measure stress sensitivity by axial loading is proposed. By loading fixed axial stress, the measurement method achieves the effect of equivalent preloading fluid pressure. Meanwhile, the equivalent theoretical curve can be obtained by translating the curve. Through this method, the stress sensitivity of the core with microfracture is studied. According to the results, the stress sensitivity of the cores can be divided into two stages: the first stage is the non-opening stage of microfractures, in which the stress sensitivity is weak; the second stage is the opening stage of microfractures, in which the stress sensitivity increases sharply. When the permeability changes significantly, the corresponding pressure is the microfracture's opening pressure. In addition, if the abscissa of the experimental results corresponds to the field production data, the field stress sensitivity curve of the field reservoir can be obtained. Conventional stress sensitivity test shows that the four cores in the study block exhibit medium to strong stress sensitivity. According to the stress sensitivity curve analysis after curve translation, the stress sensitivity of the reservoir is about 25% in the elastic production stage, which is classified as weak stress sensitivity. This conclusion can effectively support the phenomenon of the unobvious stress sensitivity in the field production of low permeability and tight reservoirs.

根据行业标准，低渗透和致密储层在实验室测试中对应力高度敏感。但这一现象并未在现场生产试验中得到有效证实。为此，提出了一种通过轴向载荷测量应力敏感性的方法。该测量方法通过加载固定轴向应力，达到等效预加载流体压力的效果。同时，通过平移曲线可以得到等效的理论曲线。通过该方法研究了微裂缝岩心的应力敏感性。结果表明，岩心应力敏感性可分为两个阶段：第一阶段为微裂缝未张开阶段，应力敏感性较弱；第二阶段为微裂缝张开阶段，其中应力敏感性急剧增加。当渗透率发生显着变化时，相应的压力为微裂缝的开启压力。另外，如果实验结果横坐标与现场生产数据相对应，就可以得到油田储层的现场应力敏感性曲线。常规应力敏感性测试表明，研究区块中的四个岩心表现出中到强的应力敏感性。根据曲线平移后的应力敏感性曲线分析，储层在弹性生产阶段的应力敏感性约为25%，属于弱应力敏感性。这一结论可以有效地支持低渗透致密储层现场生产中应力敏感性不明显的现象。