低渗透储层水淹油井堵水压裂技术研究与试验

Experimental Study on Plugging Fracturing Technology for Water-Flooded Well in Low-Permeability Reservoir

达引朋 卜向前 姚晓翔 张矿生 李志文

Da Yinpeng Bu Xiangqian Yao Xiaoxiang Zhang Kuangsheng Li Zhiwen

中国石油长庆油田公司油气工艺研究院, 陕西西安 710021; 低渗透油气田勘探开发国家工程实验室, 陕西西安 710021

Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi’an, Shaanxi, 710021, China; National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, Shaanxi, 710021, China

为了提高水淹油井的单井产量,根据油井不同见水类型,研究形成了不同水淹类型油井堵水压裂技术。针对孔隙性见水油井,研究形成了选择性堵水压裂技术,选择性堵水剂的堵水率是其堵油率的3.3倍,具有较高的选择性封堵能力。针对裂缝性见水油井,研究形成了封堵老缝定向射孔压新缝技术:其裂缝固化剂固化后体积变化小于5%,突破压力高达9.8 MPa;定向射孔根据老井剩余油分布情况,选择射孔方位,以控制压裂裂缝延伸方向。现场2口井试验表明,堵水压裂后平均日增油分别为0.81和0.76 t,具有较好的增产效果,为长庆低渗透储层水淹油井提高单井产量提供了有效的技术手段。

In order to restore or improve the production of single water flooded well,different plugging fracturing technologies were developed for such wells depending on types of water breakthrough.For pore-breakthrough well,the selective plugging fracturing technology was defined;the selective water plugging agent was highly capable of selective plugging,with rate 3.3 times that of the oil plugging rate.For fracture-breakthrough well,the technology of plugging old fractures and directional perforating to create new fractures was proposed;the fracture volume changed by less than 5% after solidifying of the agent,with breakthrough pressure up to 9.8 MPa;according to the residual oil distribution of old well,the azimuth of directional perforation was selected to control the extension direction of fractures.By field test in 2 wells,it was found that the average daily oil increment is 0.81 t and 0.76 t respectively after water plugging and fracturing,indicating better stimulation effects.Therefore,these technologies provide effective solutions to improve the production of single water-flooded well in low-permeability reservoir of Changqing Oilfield.

https://doi.org/10.3969/j.issn.1001-0890.2013.01.016