1. The results show that the water breakthrough time shortens with the increase of the horizontal well length. Under the same well space and production conditions, the water breakthrough time of five-spot pattern is longer than that of seven-spot and nine-spot pattern. With the increase of angle between the horizontal well and the horizontal direction, the water breakthrough time shortens in five-spot well pattern, firstly increases and then decreases in seven-spot pattern, and increases in nine-spot pattern. The influence of reservoir and fluid parameters on the water breakthough time is little.
计算结果表明，井网的见水时间随水平井长度的增加而缩短；相同的井距和生产条件下，五点法井网的见水时间要长于九点法和七点法井网；随水平井与水平方向夹角的增大，五点法井网的见水时间缩短，七点法井网的见水时间先增加后缩短，九点法井网的见水时间增加；油藏和流体参数对井网见水时间影响不大。
2. nine-spot
2. In order to find out a simple and efficient method to calculate the water breakthrough time in combination well pattern of horizontal and vertical wells, simplifing a horizontal well into a vertical well with the same well-hole radius, and considering the unpiston-like displacement, the water breakthrough time formulas of five-spot, seven-spot and nine-spot pattern were derived and revised by equivalent percolating resistance method. In this method, the percolation region is divided into three resistance regions.
为了寻求一种简单、有效的计算水平注水井与直井联合井网的见水时间的方法，将水平井简化为具有等效井筒半径的直井，考虑水平井与直井联合布井水驱油的非活塞性，运用等值渗流阻力法将渗流区划分为3个阻力区，推导出了五点法、七点法和九点法水平井与直井联合井网的油井见水时间的计算公式和修正公式。
3. nine-spot的翻译
3. A field pilot test project was designed and implemented to evaluate the effectiveness of hot water flooding by adding nitrogen and surfactant, after steam simulation in a reservoir with a nine-spot pattern at J90 Block of Liaohe Oilfield.
在此基础上，针对辽河油田锦90块的油藏地质特点和开采现状，进行了开发指标预测，设计了先导试验方案。
4. First of all, this paper derives pressure expressions of stable state about vertical well inanisotropic media with various boundary. Based on this, Formulae of pressure distributionfor five-spot pattern and nine-spot pattern have been established, the characters of isobariccontours and streamline are analyzed, and this equips optimum of well pattern with theoreticfoundation.
首先利用坐标转换及镜像反演理论，推导了单一直井直线边界、平行直线边界的定常渗流的压力分布公式，在此基础上研究了五点法井网、九点法井网定常渗流问题，推导了压力分布方程，分析了等势线及流线的特点，为各向异性储层井网优化提供了理论基础。
5. This paper performs a dynamic modeling of the reservoir with an angles of 0°and 45°between artificial fractures and well arrays in five-spot and inverted nine-spot patterns using a 3D two-phase reservoir numerical simulation model with artificial fractures of 0.3-0.8mm, economic evaluation model and overall optimization software.
利用带有0.3～0.8 mm人工裂缝的三维两相油藏数值模拟模型、经济评价模型和整体优化软件，对五点法和反九点法井网中人工裂缝与井排夹角为0°和45°的油藏开采进行动态模拟。
6. The numerical simulation results showed that with the inverted nine-spot pattern of 118m well space, the foam slug size of 0.2PV, the alternating injection mode of 10d foam slug and 10d flue gas, the injection and production ratio of 1:1, the recovery of the compound flooding was relatively better and total recovery percent of reserves reached 19.25%.
物模结果表明，蒸汽+烟道气+化学剂复合驱与单一蒸汽驱相比具有较明显的优势，驱油效率提高了13.92%；数模结果表明，采用118m井距反九点井网、泡沫段塞大小为0.2PV、注入方式选择10d泡沫段塞和10d烟道气交替注入、注采比选择1：1的复合驱开采效果较好，转驱后合计采出程度可达19.25%。
7. Under the same well space and production conditions, the water breakthrough time of five-spot pattern is longer than that of seven-spot and nine-spot pattern.
相同的井距和生产条件下，五点法井网的见水时间要长于九点法和七点法井网；
8. Adjusted the well pattern from inverted nine-spot to five-spot will improve the oil production and recovery.
将反九点井网调整为五点井网可以提高油田开发效果；
9. Numerical simulation of integrated fracturing project are completed by using three-dimension black oil model, production performance are predicted with favorable and unfavorable situation at inverted nine-spot and five-spot well pattern.
以三维黑油模型为基础，进行整体压裂方案数值模拟，给出了不同井网模式下裂缝有利和不利状态的生产动态预测曲线。
10. With the increase of angle between the horizontal well and the horizontal direction, the water breakthrough time shortens in five-spot well pattern, firstly increases and then decreases in seven-spot pattern, and increases in nine-spot pattern.
随水平井与水平方向夹角的增大，五点法井网的见水时间缩短，七点法井网的见水时间先增加后缩短，九点法井网的见水时间增加；
11. nine-spot的意思
11. The inverted nine-spot rhombus pattern has two adjustable directions of well array.
菱形反九点井网有两个可调的井排方向，是适合于裂缝和砂体方向性明显油藏的最佳井网。
12. We have analyzed the method of identifying rational well spacing density. On the foundation of economic analysis, we have compared and evaluated three kinds of methods (rectangular, square reverse nine-spot and rhombus reverse nine-spot) about pattern arrangement and pattern modification.
分析了合理井网密度的确定方法，以经济分析为基础对比评价了矩形、正方形反九点、菱形反九点等三种井网部署和井网调整方法。
13. nine-spot什么意思
13. The recommended scheme was inter-well infill, inverted nine-spot gas injection; gas injection pressure being above 30MPa; the flowing pressure in oil well being controlled at about 23 MPa; synchronous and continuous gas injection.
推荐方案为：井网加密方式采用井间加密，反九点法同步连续注气；注气压力为30MPa以上；采油井流压控制在23MPa左右。