石油工业技术监督

随着油气勘探开发技术的进步，深井、超深井的钻探已成为行业的新常态和前沿挑战，固井工程中为满足现场施工和后续钻探需求，固井水泥浆体系也逐渐向高密度、高性能的方向发展。但是使用高性能高密度水泥浆体系固井存在固井成本高、固井液性能与固井效益矛盾的问题。为解决上述问题，研发了高效预混降失水剂XNJ-3和低成本加重剂XNZ-1，构建了低成本高密度水泥浆体系。该体系耐温130℃，密度在2.05～2.40 g/cm³范围内可调，稠化时间可调，高温养护后浆体上下密度差≤0.02 g/cm³，且无游离液析出，失水量控制在50 mL以内，水泥石24 h抗压强度大于14 MPa，性能优良。该体系已成功应用于川渝地区气井固井工程中，现场施工易配浆，浆体流动性好，操作方便，且固井质量满足后续钻井要求。

With the progress of oil and gas exploration and development technology, the drilling of deep and ultra-deep wells has become the new normal and frontier challenge of the industry. In order to meet the needs of field construction and follow-up drilling in cementing engineering, the cementing cement slurry system has gradually developed to the direction of high density and high performance. However, there are problems such as high cementing costs and the contradiction between the performance of cementing fluids and the benefits of cementing when using high-performance and high-density cement slurry systems for cementing. In order to solve the above problems, high efficiency premixed water loss reducing agent XNJ-3 and low cost weighting agent XNZ-1 were developed,and a low cost high density cement slurry system was constructed. This system can withstand temperatures up to 130℃, with adjustable density within the range of 2.05 to 2.40 g/cm³ and adjustable thickening time. After high-temperature curing, the density difference between the top and bottom of the slurry is ≤0.02 g/cm³, and no free liquid is precipitated. The water loss is controlled within 50 mL, and the 24-hour compressive strength of the cement stone is greater than 14 MPa, demonstrating excellent performance. The system has been successfully applied to the gas well cementing project in Sichuan-Chongqing area. It is easy to mix slurry in site construction, has good slurry fluidity, and is easy to operate, and the cementing quality meets the requirements of subsequent drilling.