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自升式钻井平台桩腿半圆板压制工艺研究
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作者 张曜 《中国设备工程》 2019年第13期157-158,共2页
随着海洋工程事业的迅速发展,自升式钻井平台国产化生产成为大势所趋。本文重点研究了在压力机上整体压制钻井平台桩腿半圆板的工艺方法。通过对压制工装模具的结构设计优化设计,选取合适的调质、压制工艺方法和参数,在压力机上能够一... 随着海洋工程事业的迅速发展,自升式钻井平台国产化生产成为大势所趋。本文重点研究了在压力机上整体压制钻井平台桩腿半圆板的工艺方法。通过对压制工装模具的结构设计优化设计,选取合适的调质、压制工艺方法和参数,在压力机上能够一次压制出8m长半圆板,同时能够保证半圆板成品力学性能、曲率、直线度等要求参数。经检测,半圆板化学成分、力学性能、几何尺寸、无损检测、表面质量等全部达到优良水平。经批量生产验证,按照本文工艺方法生产半圆板,大大提高了压制效率。 展开更多
关键词 自升式钻井平台 桩腿半圆板 中温压制 超声波探伤 磁粉探伤 实物质量
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Characteristics and accumulation mechanisms of the Dongfang 13-1 high temperature and overpressured gas field in the Yinggehai Basin, the South China Sea 被引量:12
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作者 XIE YuHong HUANG BaoJia 《Science China Earth Sciences》 SCIE EI CAS 2014年第11期2799-2807,共9页
The Dongfang 13-1 is located in the diapiric structure belt of the Yinggehai Basin. The formation pressure of its main gas res- ervoir in the Miocene Huangliu Formation is up to 54.6 MPa (pressure coefficient=l.91) ... The Dongfang 13-1 is located in the diapiric structure belt of the Yinggehai Basin. The formation pressure of its main gas res- ervoir in the Miocene Huangliu Formation is up to 54.6 MPa (pressure coefficient=l.91) and the temperature is as high as 143°C (geothermal gradient 4.36°C/100 m), indicating that it is a typical high-temperature and overpressured gas reservoir. The natural gas is interpreted to be coal-type gas derived from the Miocene mature source rocks containing type Ⅱ2-Ⅲ kero- gens as evidenced by high dryness index of up to 0.98 and heavy carbon isotopes, i.e., the δ13C2 ranging from -30.76%o to -37.52%o and δ13C2 ranging from -25.02%o to -25.62%o. The high temperature and overpressured Miocene petroleum system is related mainly to diapir in the Yinggehai Basin and contains more pore water in the overpressured reservoirs due to under- compaction process. The experimental and calculated results show that the solubility of natural gas in formation water is as high as 10.5 m3/m3 under the temperature and pressure conditions of the Sanya Formation, indicating that at least part of the gas may migrate in the form of water-soluble phase. Meanwhile, the abundant gas source in the Basin makes it possible for the rapid saturation of natural gas in formation water and exsolution of soluble gas. Therefore, the main elements controlling formation of the Dongfang 13-1 gas pool include that (1) the diapir activities and accompanying changes in temperature and pressure accelerate the water-soluble gas exsolution and release a lot of free gas; (2) submarine fan fine sandstone in the Huangliu Formation provides good gas-water segregation and accumulation space; and (3) the overlying overpressured mud rocks act as effective caps. The accumulation mechanism reveals that the high temperatural and high pressure structure belt near the diapir structures has a good potential for large and medium-sized gas field exploration. 展开更多
关键词 Dongfang 13-1 high temperature and overpressured gas field accumulation mechanism diapiric belt Yinggehai Basin
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