HiWAY压裂技术在雷平2井中的应用

Application of Hi WAY Fracturing Technique in Well Leiping2

雷平2井位于辽河油田雷家区块,该区块是辽河油田的勘探重点区块,从岩性上看为泥质白云岩、白云质泥岩,储集空间以孔隙-裂缝型和裂缝型为主,储层渗透率小于1m D,孔隙度小于10%,试采前需进行压裂改造。前期先后开展3口探井的常规压裂试验,但因储层泥质含量较高、支撑剂嵌入伤害较大,导流能力损失较大,现场实施效果均不理想,故采用导流能力超强的Hi WAY压裂技术。Hi WAY压裂技术通过在压裂支撑剂中加入纤维,同时采用脉冲式加砂方式,在裂缝内形成许多条高速导流通道,较常规压裂具有更高的导流能力。水平井泵送速钻桥塞分段压裂技术具有封隔可靠、分段压裂级数不受限制、裂缝布放位置精确等特点。将Hi WAY压裂技术应用于雷平2井,同时配合水平井速钻桥塞分段压裂技术进行现场施工,压后该井最大日产液316.5m3/d,最大日产油110.8m3/d,投入产出比约为3.55。初步判断,Hi WAY压裂技术可以实现雷家区块储层的有效动用。

Well Leiping2 locates in the Leijia block of Liaohe oilfield.This block is an important exploration one.Argillaceous dolomite and dolomitic mudstone are the main lithology.The main type of the reservoir space are pore-fracture and fracture with the permeability being less than 1m D and the porosity being less than10%.So it should be featured before production test.Conventional fracturing tests were made in three ex-ploratory wells successively in early period.But the effect was not satisfied for high shale content,great harm of proppant embedding and great loss of the flow conductivity.So HiW AY fracturing technique with great flow conductivity was applied.Many HiW AY flow-channels may be formed in the fractures after fiber is added in-to the fracturing proppant by the way of pulse sanding.This technology has greater flow conductivity than the conventional fracturing.Staged fracturing by fast drilled bridge plug through horizontal wells has the features of reliable sealing,random stages of fracturing and accurate fracturing location.HiW AY fracturing technique was applied to Well Leiping2 combined with the staged fracturing by fast drilled bridge plug through the horizon-tal wells.After fracturing,the highest daily fluid production and oil production are 316.5 and 110.8m3/d respectively and input-output ratio is about 3.55.So we could decide that the reservoirs in Leijia block may be produced effectively by this technique.