Hade 4 oilfield is located on the Hadexun tectonic belt north of the Manjiaer depression in the Tarim basin, whose main target layer is the Donghe sandstone reservoir, with a burial depth over 5,000m and an amplitude ...Hade 4 oilfield is located on the Hadexun tectonic belt north of the Manjiaer depression in the Tarim basin, whose main target layer is the Donghe sandstone reservoir, with a burial depth over 5,000m and an amplitude below 34m, at the bottom of the Carboniferous. The Donghe sandstone reservoir consists of littoral facies deposited quartz sandstones of the transgressive system tract, overlapping northward and pinching out. Exploration and development confirms that water-oil contact tilts from the southeast to the northwest with a drop height of nearly 80m. The reservoir, under the control of both the stratigraphic overlap pinch-out and tectonism, is a typical subtle reservoir. The Donghe sandstone reservoir in Hade 4 oilfield also has the feature of a large oil-bearing area (over 130 km2 proved), a small thickness (average efficient thickness below 6m) and a low abundance (below 50 × 104t/km2). Moreover, above the target layer developed a set of igneous rocks with an uneven thickness in the Permian formation, thus causing a great difficulty in research of the velocity field. Considering these features, an combination mode of exploration and development is adopted, namely by way of whole deployment, step-by-step enforcement and rolling development with key problems to be tackled, in order to further deepen the understanding and enlarge the fruits of exploration and development. The paper technically focuses its study on the following four aspects concerning problem tackling. First, to strengthen the collecting, processing and explanation of seismic data, improve the resolution, accurately recognize the pinch-out line of the Donghe sandstone reservoir by combining the drilling materials in order to make sure its distribution law; second, to strengthen the research on velocity field, improve the accuracy of variable speed mapping, make corrections by the data from newly- drilled key wells and, as a result, the precision of tectonic description is greatly improved; third, to strengthen the research on sequence stratigraphy and make sure the distribution law of the Donghe sandstone; and fourth, with a step- by-step extrapolation method, to deepen the cognition of the leaning water-oil contact, and by combining the tectonic description and drilling results, to make sure little by little the law of change of the water-oil contact. The exploration and development of the Donghe sandstone subtle reservoir in Hade 4 oilfield is a gradually perfected process. From 1998 when it was discovered till now, the reservoir has managed to make a benign circle of exploration and development, in which its reserve has gradually been enlarged, its production scale increased, and, in a word, it has used techniques necessary for this subtle reservoir in the Tarim basin.展开更多
哈得油田双台阶水平井注水开发中存在层间矛盾突出、亟需调节注水矛盾和改善指进现象的问题。对8种生物聚合物进行不同碳链(C12,C14和C16)的可控疏水化改性,合成并筛选兼具热增稠和盐增稠性能,且可用于高温、高盐条件的深部调驱聚合物...哈得油田双台阶水平井注水开发中存在层间矛盾突出、亟需调节注水矛盾和改善指进现象的问题。对8种生物聚合物进行不同碳链(C12,C14和C16)的可控疏水化改性,合成并筛选兼具热增稠和盐增稠性能,且可用于高温、高盐条件的深部调驱聚合物材料。结果表明,质量分数1.0%的BP-14-036和BP-12-012溶液,在清水条件下的黏度为10 000 m Pa·s左右,矿化度升高至250 g/L时,黏度超过12 000 m Pa·s,具有盐增稠性能;当温度达到130℃时,质量分数1.0%的BP-14-036溶液,黏度可超过14 000 m Pa·s,具有热增稠性能。因此,制备的这2种聚合物材料,可在一定程度上,将油藏极端条件由降低调驱效果的应用阻力,扭转为改善调驱效果的有利因素。这一特点,有望从本质上解决高温高盐油田调剖调驱剂、压裂液及钻井液体系增稠性差、耐受性低的问题。展开更多
文摘Hade 4 oilfield is located on the Hadexun tectonic belt north of the Manjiaer depression in the Tarim basin, whose main target layer is the Donghe sandstone reservoir, with a burial depth over 5,000m and an amplitude below 34m, at the bottom of the Carboniferous. The Donghe sandstone reservoir consists of littoral facies deposited quartz sandstones of the transgressive system tract, overlapping northward and pinching out. Exploration and development confirms that water-oil contact tilts from the southeast to the northwest with a drop height of nearly 80m. The reservoir, under the control of both the stratigraphic overlap pinch-out and tectonism, is a typical subtle reservoir. The Donghe sandstone reservoir in Hade 4 oilfield also has the feature of a large oil-bearing area (over 130 km2 proved), a small thickness (average efficient thickness below 6m) and a low abundance (below 50 × 104t/km2). Moreover, above the target layer developed a set of igneous rocks with an uneven thickness in the Permian formation, thus causing a great difficulty in research of the velocity field. Considering these features, an combination mode of exploration and development is adopted, namely by way of whole deployment, step-by-step enforcement and rolling development with key problems to be tackled, in order to further deepen the understanding and enlarge the fruits of exploration and development. The paper technically focuses its study on the following four aspects concerning problem tackling. First, to strengthen the collecting, processing and explanation of seismic data, improve the resolution, accurately recognize the pinch-out line of the Donghe sandstone reservoir by combining the drilling materials in order to make sure its distribution law; second, to strengthen the research on velocity field, improve the accuracy of variable speed mapping, make corrections by the data from newly- drilled key wells and, as a result, the precision of tectonic description is greatly improved; third, to strengthen the research on sequence stratigraphy and make sure the distribution law of the Donghe sandstone; and fourth, with a step- by-step extrapolation method, to deepen the cognition of the leaning water-oil contact, and by combining the tectonic description and drilling results, to make sure little by little the law of change of the water-oil contact. The exploration and development of the Donghe sandstone subtle reservoir in Hade 4 oilfield is a gradually perfected process. From 1998 when it was discovered till now, the reservoir has managed to make a benign circle of exploration and development, in which its reserve has gradually been enlarged, its production scale increased, and, in a word, it has used techniques necessary for this subtle reservoir in the Tarim basin.
文摘哈得油田双台阶水平井注水开发中存在层间矛盾突出、亟需调节注水矛盾和改善指进现象的问题。对8种生物聚合物进行不同碳链(C12,C14和C16)的可控疏水化改性,合成并筛选兼具热增稠和盐增稠性能,且可用于高温、高盐条件的深部调驱聚合物材料。结果表明,质量分数1.0%的BP-14-036和BP-12-012溶液,在清水条件下的黏度为10 000 m Pa·s左右,矿化度升高至250 g/L时,黏度超过12 000 m Pa·s,具有盐增稠性能;当温度达到130℃时,质量分数1.0%的BP-14-036溶液,黏度可超过14 000 m Pa·s,具有热增稠性能。因此,制备的这2种聚合物材料,可在一定程度上,将油藏极端条件由降低调驱效果的应用阻力,扭转为改善调驱效果的有利因素。这一特点,有望从本质上解决高温高盐油田调剖调驱剂、压裂液及钻井液体系增稠性差、耐受性低的问题。
