适用于高密度钻井液封隔器锁紧机构的研制
发布时间：2018-09-11 13:18
【摘要】：在钻井液密度和固相含量均很高的西南元坝地区,常规的封隔器锁紧机构容易因沉砂堆积导致其失效。鉴于此,研制了双螺纹卡簧封隔器锁紧机构。双螺纹卡簧内侧采用锯齿螺纹与本体配合,起防退作用,卡簧外侧采用大螺距的T形螺纹结构,以增大卡簧与锁紧套间隙;设立容砂槽,即使固相堆积,仍可保证封隔器正常坐封及锁紧机构的防退,产生抱紧力,提高防退性能。试验及应用结果表明:双螺纹卡簧锁紧机构可以保证封隔器在井下高密度和高固相含量环境中承受70 MPa以上的压差仍不回弹。研究结果可为封隔器的设计提供一定的参考。
[Abstract]:In Yuanba area of southwest China, where the density and solid content of drilling fluid are high, the conventional Packer locking mechanism is liable to fail due to sand sinking. In view of this, the locking mechanism of double threaded spring Packer is developed. The inner side of the double threaded clip spring is matched with the body by sawtooth thread to prevent its retreat. The outside of the clip spring adopts a large pitch T-shaped thread structure to increase the gap between the spring and the locking sleeve, and a sand holding groove is set up, even if the solid phase accumulates, It can also ensure the normal setting of Packer and the anti-back of locking mechanism, which can produce clasp force and improve the performance of anti-retrogression. The experimental and application results show that the double threaded spring locking mechanism can ensure that the Packer still does not rebound when the pressure difference is over 70 MPa in the environment of high density and high solid content. The results can provide some reference for the design of Packer.
【作者单位】： 中国石化石油工程技术研究院;德州大陆架石油工程技术有限公司;
【基金】：国家科技重大专项“低渗透油气藏高效开发钻完井技术”之课题五“高压低渗油气藏固井完井技术”(2016ZX05021-005)
【分类号】：TE931.2;TE254
[Abstract]:In Yuanba area of southwest China, where the density and solid content of drilling fluid are high, the conventional Packer locking mechanism is liable to fail due to sand sinking. In view of this, the locking mechanism of double threaded spring Packer is developed. The inner side of the double threaded clip spring is matched with the body by sawtooth thread to prevent its retreat. The outside of the clip spring adopts a large pitch T-shaped thread structure to increase the gap between the spring and the locking sleeve, and a sand holding groove is set up, even if the solid phase accumulates, It can also ensure the normal setting of Packer and the anti-back of locking mechanism, which can produce clasp force and improve the performance of anti-retrogression. The experimental and application results show that the double threaded spring locking mechanism can ensure that the Packer still does not rebound when the pressure difference is over 70 MPa in the environment of high density and high solid content. The results can provide some reference for the design of Packer.
【作者单位】： 中国石化石油工程技术研究院;德州大陆架石油工程技术有限公司;
【基金】：国家科技重大专项“低渗透油气藏高效开发钻完井技术”之课题五“高压低渗油气藏固井完井技术”(2016ZX05021-005)
【分类号】：TE931.2;TE254
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