特种油气藏2017，Vol.24Issue(6)：161-164,4.DOI:10.3969/j.issn.1006-6535.2017.06.032
MX井深层白云岩储层非均匀酸化压裂技术
Non-Uniform Acid Fracturing Technology for Deep Dolomite Reservoir in Well MX
摘要
Abstract
The fractures etched by acid in the deep dolomite reservoirs in Well MX don't have sufficient flow conductivity.To solve this problem,non-uniform acid fracturing technology was designed in this paper.By virtue of this technology,the acids with different viscosities and reaction speeds are combined and then injected,so that the etching is strongly irregular under the dual effect of non-uniform acid distribution and non-uniform acid-rock reaction intensity.Then,by means of laboratory etched fracture flow conductivity evaluation technology,the etching characteristics of rock plate were depicted and the flow conductivity of non-uniformly etched fractures under the closure stress of 20-90 MPa was measured.It is indicated that the alternative etching of crosslinked acid+hydrochloric acid and crosslinked acid+gelled acid can generate obvious non-uniform grooves or pits.In the mode of elongated etched groove,good flow paths can be generated under high closure stress,and in the mode of extensive etched pit,the flow conductivity is higher under middle and low closure stress.The non-uniform acid fracturing technology of crosslinked acid+gelled acid two-stage altemative etching is adopted in Well MX.Its acid viscosity ratio is 6.67,the flow rate is 5.5-6.0 m3/min and the daily oil production in the early stage after the fracturing is 65 t/d.To sum up,the non-uniform acid fracturing technology is simple and no extra stimulation cost is needed.It is of great signiflcance to improve the stimulation effect of deep dolomite reservoirs.关键词
白云岩/非均匀酸化压裂/导流能力/非均匀刻蚀Key words
dolomite/non-uniform acid fracturing/flow conductivity/non-uniform etching分类
能源科技引用本文复制引用
周林波,宋志峰,张俊江,周珺,董光盛..MX井深层白云岩储层非均匀酸化压裂技术[J].特种油气藏,2017,24(6):161-164,4.基金项目
国家科技重大专项“超深井碳酸盐岩储层改造及测试关键技术”(2017ZX05005-005-004) （2017ZX05005-005-004）
