摘要：Fractures play an important role in both reservoir fluid flow and well productivity. Fracture conductivity is an important parameter to evaluate the fractured reservoir. It is difficult to evaluate the fracture conductivity with conventional prospecting methods. The wireline formation tester has been applied to evaluate the fracture conductivity near wellbore. The effects of evaluating the fractures crossed and non-crossed well borehole with the method of interval pressure transient tests and harmonic pulse testing are analyzed. In order to research the effects that evaluate the fractures in the reservoir with the wireline formation tester, we used the finite element method to simulate the pressure response of fractured reservoirs with the interval pressure transient tests and harmonic pulse testing. At first, we simulated the pressure response of different fracture parameters with interval pressure transient tests and analyzed the different effects of evaluating the fractures crossed and non-crossed well borehole. Then we analyzed the feasibility of evaluating the fractures non-crossed well borehole with the harmonic pulse testing. The pressure response of different pulse frequencies and different dual probe spacing were simulated and the simulation results of different fracture parameters were compared and analyzed. In order to investigate the effect of the fracture conductivity on the interval test behavior, at first, we changed the fracture conductivity in the range from 1X 10(-15)m(3), 1X 10(-14), 1 X 10(-13) m(3) to 5 X 10(-13)m(3). The simulation results indicate that pressure drawdown is faster and buildup occurs slower as the fracture conductivity decreases. The pressure differential and MDH curves of different fracture conductivity values can be distinguished easily from a pressure gauge. It presents that the fracture conductivity can be evaluated by the interval pressure transient tests efficiently. In the second case, the fractures do not intersect with the well borehole. The fracture conductivity varies from 1X 10(-17) m(3), 1 X 10(-15) m(3), 1X 10(-14)m(3) to 1 X 10(-12) m(3). The simulation results show that pressure responses have a small change when the fracture conductivity is varied. Although the values of different pressure differentials can be distinguished by a quartz gauge, the effect on pressure response is negligible. Then we used Harmonic pulse testing to evaluate non-crossed fractures. At first, the pulse frequency was defined as 0. 1 Hz, the spacing of dual probe was defined as 20 cm. From the simulation results, there is a certain pressure differential and phase shift between the fractured reservoir and non-fractured reservoir. In addition, the pressure differential and phase shift can be distinguished between different fractures conductivity values. When the spacing of the dual probe was equal to 50 cm, there is evident amplitude differential and phase shift between fractured formation and non-fractured formation. Thus it indicates the long spacing of dual probe can detect those fractures near the well borehole more efficiently. Finally, we simulated the pressure response for different radial depths of fractures near well borehole, for which the pulse frequency was defined as 0. 1 Hz and the spacing of the dual probe was 50 cm. According to the simulation results, the method of harmonic pulse testing can detect the fractures near the well borehole efficiently. However, it becomes more difficult and probably invalid for detecting those fractures located far away from the well borehole. The fractures intersecting the well borehole can be evaluated efficiently by interval pressure transient tests depending on fracture conductivities. Non-intersecting fractures in the vicinity of the well borehole have negligible effects with the method. However, when the fracture conductivity increases, or the fractures get close to the well borehole, the effect becomes noticeable. Harmonic pulse testing can detect and evaluate the non-crossed fractures with appropriate spacing of the dual probe and pulse frequency. Through decreasing pulse frequency and increasing dual probe spacing, it can increase detection distance and improve the detection precision. However, this method becomes much less precise when the fractures conductivity become enough large or fractures located far away from the well borehole.

关键字：Finite element method Wireline formation tester Interval pressure transient tests Harmonic pulse testing Fracture reservoir seepage

ISSN号：0001-5733

卷、期、页：卷: 58 期: 1 页: 298-306

发表日期：2015-01-01

期刊分区（SCI为中科院分区）：四区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）

发表期刊名称：CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION

参与作者：张同义,毛军

通讯作者：邸德家

第一作者：陶果,王兵

论文类型：期刊论文

论文概要：邸德家,陶果,张同义,毛军,王兵，Finite element studies on characterization of near wellbore fractures using the wireline formation tester，CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION，2015，卷: 58 期: 1 页: 298-306

论文题目：Finite element studies on characterization of near wellbore fractures using the wireline formation tester