低渗透油藏缝内转向压裂技术研究与试验

Research and test of in-seam steering fracturing technology in low permeability reservoirs

Y油田属于低孔低渗透油田,储层物性差,断块破碎,低产低注现象突出,难采储量占比大,随着开采程度的深入,老裂缝控制的原油已接近全部采出,常规重复压裂增产效果逐年变差。为提高低渗透油田单井产量,2022年在Y油田开展了老井缝内暂堵转向压裂试验,通过分析缝内转向压裂技术在Y油田老井改造中的应用效果,评价其在低渗透油气田的适用性,现场试验10口井,平均单井日增油1.1 t,当年累计增油1108 t,措施增产效果明显。该试验的成功实施为低渗透油田剩余油的有效挖潜探索了一条新途径。

The Y oilfield is a low porosity and low permeability oilfield,with poor reservoir physical properties,broken block,low production and low injection,and a large proportion of difficult to re-cover reserves.With the deepening of exploitation degree,the crude oil controlled by old fractures has been nearly fully recovered,and the stimulation effect of conventional re-fracturing has become worse year by year.In order to improve the production of a single well in the low permeability oilfield,the Y oilfield has carried out a temporary plugging and steering fracturing test in the old well fractures in 2022.By analyzing the application effect of in-seam fracture steering fracturing technology in the re-construction of old wells in Y oilfield,the applicability in low permeability oil and gas fields is evaluated.Field tests have been conducted on ten wells,with an average daily oil increasing of 1.1 t per well and a cumulative oil increase of 1108 t in the same year.The measures have obvious effect.Most impor-tantly,the successful implementation of this test has explored a new way for effectively tapping the po-tential of remaining oil in low permeability oilfields.