纤维暂堵转向酸压工艺设计方法与应用

油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (6): 65-71.

纤维暂堵转向酸压工艺设计方法与应用

罗志锋¹,吴林¹,赵立强¹,张楠林¹,程龙¹,任登峰²

^1. 西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500
^2. 中国石油塔里木油田分公司油气工程研究院,新疆库尔勒 841000

收稿日期:2019-01-24 发布日期:2019-12-30 出版日期:2019-12-26
作者简介:罗志锋（1980 —）,男,博士,副教授,从事油气藏动态及增产改造理论与技术研究。通讯地址：四川省成都市新都区新都大道8号,邮政编码：610500。E-mail： lzf03429@163.com
基金资助:
国家科技重大专项“缝洞型碳酸盐岩靶向酸压数值模拟研究”(2016ZX05014);国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(2016ZX05052)

Design method and application of temporary plugging by fiber and diverting acid fracturing

Zhifeng LUO¹,Lin WU¹,Liqiang ZHAO¹,Nanlin ZHANG¹,long CHENG¹,Dengfeng REN²

^1. State Key Laboratory of Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
^2. Research Institute of Oil and Gas Engineering, CNPC Tarim Oilfield Company, Korla, Xinjiang 841000, China

Received:2019-01-24 Online:2019-12-30 Published:2019-12-26

摘要/Abstract

摘要：

针对纤维暂堵转向酸压纤维用量定量化设计难的问题,建立了考虑初次人工裂缝、邻井人工裂缝、孔隙压力变化、温度变化及原地应力的总应力场模型。进行多元非线性回归,建立了转向半径的预测模型。采用位移不连续法（DDM）等进行求解,并结合纤维封堵机理,建立了纤维用量设计模型。模拟结果表明,初次人工裂缝在最小主应力方向上的诱导应力值更大,邻井人工裂缝、孔隙压力变化、温度变化对应力转向的影响较小。原地应力差越小,初次人工裂缝越长,井距越小,裂缝内净压力越大转向越容易,转向半径越大。当原地应力差较大时,有必要采用纤维暂堵的方式以提高缝内净压力,纤维用量可根据纤维用量设计模型确定。将上述设计应用于新疆M井,设计结果与现场施工结果基本接近,新裂缝转向成功。

关键词: 纤维暂堵, 转向酸压, 应力场, 转向半径, 纤维用量

Abstract:

In order to solve the problem of quantitative design of fiber in fiber temporary plugging and diverting acid fracturing, a total stress field model considering the initial artificial fracture, adjacent well artificial fracture, pore pressure change, temperature change and in-situ stress is established. And then the prediction model of diverting radius is established by multivariate nonlinear regression. Meanwhile, methods such as the displacement discontinuity method（DDM） are used to solve the model, and combined with the fiber plugging mechanism, the design model of fiber dosage is established. The simulation results show that the induced stress value of the initial artificial fracture in the direction of minimum principal stress is larger, and the influence of artificial fracture of adjacent well or wells, pore pressure variation and temperature variation on stress diverting are small. The smaller the original in-situ stress difference, the longer the initial artificial fracture length, the smaller the well spacing, the larger the net pressure in the fracture, and the larger the diverting radius. When the in-situ stress difference is large, it is necessary to use the temporary plugging of fiber to increase the net pressure of the fractures, and the fiber dosage can be determined according to the design plate. Applying the above design method to a well in Xinjiang, the results were basically close to the on-site construction results, and the new fracture diverted successfully.

Key words: temporary plugging by fiber, diverting acid fracturing, stress field, diverting radius, fiber dosage

中图分类号:

TE122.2

罗志锋,吴林,赵立强等. 纤维暂堵转向酸压工艺设计方法与应用[J]. 油气藏评价与开发, 2019, 9(6): 65-71.

Zhifeng LUO,Lin WU,Liqiang ZHAO, et al. Design method and application of temporary plugging by fiber and diverting acid fracturing[J]. Reservoir Evaluation and Development, 2019, 9(6): 65-71.

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