全通径酸压管柱在塔河油田托甫台区的应用

塔河油田托甫台区常规酸压管柱封隔器、水力锚与Ф88.9 mm油管内径不一致,导致施工摩阻增大,影响酸压效果,为此,进行了全通径酸压管柱研究。研发了Y241-146全通径封隔器,在不影响封隔器外径和坐封效果的前提下,将封隔器中心管内径由62 mm增至76 mm,水力锚内径由62 mm增至76 mm,该酸压管柱实现整体通径均为76 mm;关键零部件均采用42Cr高强度材料,胶筒材质由丁腈橡胶改进为氢化丁腈橡胶,有效提高了工具抗拉和抗压强度、耐温性能及密封性能。在塔河油田托甫台区进行了26口井的现场应用,管柱坐封、验封、酸压施工、解封均一次成功,平均单井降低酸压施工摩阻4~5 MPa,试验表明该压裂管柱可满足现场工艺要求。

Development and application of full bore acid fracturing string in Tuofutai Region of Tahe Oilfield

The packers for conventional acid fracturing string and hydraulic anchors used in Tuofutai Region of Tahe Oilfield are not match the internal diameter of ?88.9 mm tubing, leading to increase in friction and affecting the effectiveness of acid fracturing. For this reason, the research on full bore acid fracturing string was conducted and the Y241-146 full bore packer was developed. On condition that the external diameter of the packer and its setting effect are not affected, the internal diameter of central tube of the packer is increased from 62 mm to 76 mm, and the internal diameter of hydraulic anchor increased from 62 mm to 76 mm. The acid fracturing strings have a diameter of 76 mm as a whole; the key components are 42Cr high-strength material; the rubber sleeve material is changed from nitrile rubber to hydrogenated nitrile rubber, which effectively improves the tension and compression strengths, temperature resistance and sealing performance of the tool. It has been used in 26 wells in Tuofutai Region of Tahe Oilfield, and the string setting, checking, acid fracturing and unsetting were all successfully conducted in one time; the acid fracturing friction was reduced by 4–5 MPa in average in single well. The tests show that the acid fracturing string can meet the requirement of site technology.