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

作　　者：达引朋[1,2] 卜向前[1,2] 姚晓翔[1,2] 张矿生[1,2] 李志文[1,2] 

机构地区：[1]中国石油长庆油田公司油气工艺研究院,陕西西安710021 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710021

出　　处：《石油钻探技术》2013年第1期82-86,共5页Petroleum Drilling Techniques

基　　金：中国石油天然气集团公司重大科技专项"长庆特低渗透油田稳产及提高采收率技术研究"(编号:2008E-1305)部分研究内容

摘　　要：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9.8MPa;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0.76t,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 cre- ate 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 azi- muth 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.

关 键 词：低渗透储集层 水淹井 压裂 选择性封堵 定向射孔 

分 类 号：TE358.1[石油与天然气工程—油气田开发工程] TE357.1