技术领域：Technical field:
本发明属于油田开发技术领域，具体涉及一种油井压裂提高采收率新方法。The invention belongs to the technical field of oil field development, and in particular relates to a new method for oil well fracturing to increase recovery.
背景技术：Background technique:
油层压裂是一种改造储层物性、提高油藏开发效果的重要增产技术，在储层岩石物性较差的油田中被广泛应用。常规压裂过程中，通常先将前置液大排量注入，造成注入压力迅速升高，当注入压力大于储层岩石破裂压力时，储层发生破裂，后续过程再分别注入携砂液和顶替液，最终完成整个压裂施工。实际压裂过程中，为减少压裂液用量和降低药剂费用，通常要求压裂液具有良好造壁性，即在裂缝表面形成暂堵层，用以降低滤失量。所以，常规压裂过程中对裂缝壁面附近油相驱替作用较弱，难以在裂缝壁面附近以及裂缝前缘形成高含油区域。压裂施工结束开始生产后，井壁附近储层中原油在生产压差作用下通过裂缝流入油井，但受储层物性差及后续驱替流体有效波及范围有限等因素影响，主要依靠生产压差作用难以造成储层含油饱和度较大幅度降低，因此常规压裂施工面普遍面临着生产见效快但见效周期较短的问题。Reservoir fracturing is an important stimulation technology to improve reservoir physical properties and improve reservoir development effect, and it is widely used in oilfields with poor reservoir rock physical properties. In the conventional fracturing process, a large amount of pre-fluid is usually injected first, causing the injection pressure to rise rapidly. When the injection pressure is greater than the fracture pressure of the reservoir rock, the reservoir fractures, and the sand-carrying fluid and replacement fluid are injected separately in the subsequent process. fluid, and finally complete the entire fracturing construction. In the actual fracturing process, in order to reduce the amount of fracturing fluid and reduce the cost of chemicals, the fracturing fluid is usually required to have good wall-building properties, that is, to form a temporary plugging layer on the fracture surface to reduce fluid loss. Therefore, during the conventional fracturing process, the displacement effect on the oil phase near the fracture wall is weak, and it is difficult to form high oil-bearing areas near the fracture wall and at the fracture front. After the fracturing operation is completed and the production starts, the crude oil in the reservoir near the well wall flows into the oil well through the fractures under the action of the production pressure difference. Therefore, conventional fracturing operations generally face the problem of rapid production but short effective period.
发明内容：Invention content:
本发明弥补和改善了上述现有技术的不足之处，为解决现有常规油井压裂工艺难以动用近井地带原油、生产减小周期短和增油效果有限的问题，设计了一种油井压裂提高采收率方法，该方法提出了“先驱替后压裂”的新工艺代替了常规直接压裂工艺，前置驱替流程可在将常规开采中难以动用的近井地带原油驱至靠近注入井的同时改善近井储层中油相流动能力，有利于提高压裂施工后的生产效果，最终达到提高采收率目的。（技术原理示意图见图1）The present invention makes up for and improves the deficiencies of the above-mentioned prior art. In order to solve the problems that the existing conventional oil well fracturing technology is difficult to use the crude oil in the near-well zone, the production reduction period is short and the oil increase effect is limited, an oil well fracturing process is designed. Fracturing EOR method, this method proposes a new technology of "first-displacement followed by fracturing" to replace the conventional direct fracturing process. Improving the fluidity of the oil phase in the reservoir near the wellbore while injecting it into the well is beneficial to improving the production effect after fracturing, and ultimately achieving the purpose of improving the recovery factor. (See Figure 1 for the schematic diagram of the technical principle)
本发明采用的技术方案为：一种油井压裂提高采收率新方法，该方法的施工工艺为：The technical scheme adopted in the present invention is: a new method for oil well fracturing to enhance oil recovery, and the construction technology of the method is:
步骤一、根据实际储层物性和生产动态特征选取压裂施工井及压裂层位；Step 1. Selecting fracturing construction wells and fracturing layers according to the actual reservoir physical properties and production dynamic characteristics;
步骤二、根据储层物性、地层破裂压力值和施工规模确定前置驱替液的类型、注入量和注入排量，以及压裂液的类型、组成、注入量和注入排量；Step 2. Determine the type, injection volume, and injection displacement of the pre-displacement fluid, and the type, composition, injection volume, and injection displacement of the fracturing fluid according to the physical properties of the reservoir, the fracture pressure value of the formation, and the construction scale;
步骤三、在低于储层破裂压力的条件下，按照设计施工参数向储层注入前置驱替液；Step 3. Under the condition of lower than the fracture pressure of the reservoir, inject the pre-displacement fluid into the reservoir according to the design and construction parameters;
步骤四、注完前置驱替液后，按照设计施工参数注入压裂液进行压裂施工；Step 4: After injecting the pre-displacement fluid, inject the fracturing fluid according to the design and construction parameters for fracturing construction;
步骤五、压裂施工完成后，进行后续开井生产，并监测油井生产动态。Step 5: After the fracturing construction is completed, follow-up well production is carried out, and the production performance of the oil well is monitored.
所述压裂液的类型包括前置液、携砂液和顶替液的类型，压裂液的组成包括前置液、携砂液和顶替液的组成比例。The type of the fracturing fluid includes types of pre-fluid, sand-carrying fluid and displacement fluid, and the composition of the fracturing fluid includes composition ratios of the pre-fluid, sand-carrying fluid and displacement fluid.
所述的前置驱替液的类型针对实际压裂储层物性进行选择，驱油体系包括清水、表面活性剂溶液、普通聚合物溶液、二元体系和三元体系，其中二元体系为聚合物/表面活性剂复合体系，三元体系为碱/表面活性剂/聚合物复合体系。The type of the pre-displacement fluid is selected according to the physical properties of the actual fracturing reservoir. The oil displacement system includes clear water, surfactant solution, common polymer solution, binary system and ternary system, wherein the binary system is polymeric substance/surfactant composite system, and the ternary system is alkali/surfactant/polymer composite system.
所述的前置驱替液注入量针对实际压裂规模及储层物性进行设计。The injection volume of the pre-displacement fluid is designed according to the actual fracturing scale and reservoir physical properties.
所述的压裂液的类型及注入量针对实际压裂规模以及储层物性进行设计。The type and injection volume of the fracturing fluid are designed according to the actual fracturing scale and reservoir physical properties.
本发明的有益效果：与现有常规直接压裂施工工艺相比较，本发明的“先驱替后压裂”新工艺中的前置驱替流程一方面可在压裂施工前将常规开采中难以动用的近井地带原油驱至靠近注入井，有利于扩大后续生产过程驱替流体的有效波及范围；另一方面驱替流程在储层中形成了高含油饱和度区域，增强了油相流动能力，压裂施工后在生产压差作用下由裂缝壁面附近流入裂缝中的油量增加，两方面的综合作用可有效提高压裂施工后的生产效果，最终达到提高采收率目的。Beneficial effects of the present invention: Compared with the existing conventional direct fracturing construction technology, the pre-displacement process in the new technology of "first-displacing and then fracturing" of the present invention can, on the one hand, remove the The oil near the wellbore is driven close to the injection well, which is beneficial to expand the effective sweeping range of the displacement fluid in the subsequent production process; on the other hand, the displacement process forms a high oil saturation area in the reservoir, which enhances the flow capacity of the oil phase After the fracturing operation, the amount of oil flowing into the fracture from the vicinity of the fracture wall increases under the action of the production pressure difference. The combined effect of the two aspects can effectively improve the production effect after the fracturing operation, and finally achieve the purpose of enhancing the oil recovery.
附图说明：Description of drawings:
图1是本发明的技术原理示意图。Fig. 1 is a schematic diagram of the technical principle of the present invention.
图2是本发明实施例一中的岩心结构示意图。Fig. 2 is a schematic diagram of the core structure in Embodiment 1 of the present invention.
图3是本发明中实施例一中的驱替设备流程示意图。Fig. 3 is a schematic flow diagram of the displacement equipment in Embodiment 1 of the present invention.
图4是本发明实施例二中的反九点井网示意图。Fig. 4 is a schematic diagram of an inverted nine-spot well pattern in Embodiment 2 of the present invention.
图5是本发明实施例二中的地质模型示意图。Fig. 5 is a schematic diagram of a geological model in Embodiment 2 of the present invention.
具体实施方式：由于实际油藏环境复杂且储层物性因开发措施不同存在差异，压裂施工过程中较难找到物性高度相似的区块进行施工效果对比评价。近年来，油藏物理模拟及数值模拟技术在油田开发效果研究过程中起到了重要作用，因此本发明采用物理模拟实验和数值模拟进行具体实施效果对比。Specific implementation methods: Due to the complex environment of the actual reservoir and the differences in reservoir physical properties due to different development measures, it is difficult to find blocks with highly similar physical properties during fracturing construction for comparative evaluation of construction effects. In recent years, reservoir physical simulation and numerical simulation technology have played an important role in the research process of oil field development effects, so the present invention uses physical simulation experiments and numerical simulations to compare specific implementation effects.
实施例一Embodiment one
采用石英砂环氧树脂胶结人造均质岩心进行压裂施工工艺效果物理模拟评价。Using quartz sand epoxy resin to bond artificial homogeneous core for physical simulation evaluation of fracturing construction process effect.
1、实验材料1. Experimental materials
前置驱替液为聚合物溶液（质量分数0.1%）和压裂液为聚合物凝胶压裂液(0.13％聚合物+0.12％助排剂+2.0％DZ-2交联剂+0.4％过硫酸铵)。聚合物为大庆炼化公司生产部分水解聚丙烯酰胺干粉（HPAM），相对分子质量分别为M=1900×104，有效含量为88.0%；助排剂为大庆高新区华龙祥化工有限公司生产非离子型表面活性剂，交联剂为有机铬交联剂，破胶剂为过硫酸铵。The pre-displacement fluid is polymer solution (mass fraction 0.1%) and the fracturing fluid is polymer gel fracturing fluid (0.13% polymer + 0.12% drainage aid + 2.0% DZ-2 crosslinking agent + 0.4% Ammonium persulfate). The polymer is partially hydrolyzed polyacrylamide dry powder (HPAM) produced by Daqing Refining and Chemical Company, the relative molecular weight is M=1900×104 , and the effective content is 88.0%. Ionic surfactant, the cross-linking agent is an organic chromium cross-linking agent, and the breaker is ammonium persulfate.
实验用水为大庆油田现场施工所用压裂液配制水。实验用油为模拟油，由大庆油田原油与轻烃混合而成，45℃条件下黏度为9.8mPa·s。The experimental water is the fracturing fluid preparation water used in Daqing oil field construction. The oil used in the experiment is simulated oil, which is a mixture of Daqing oilfield crude oil and light hydrocarbons, with a viscosity of 9.8 mPa·s at 45 °C.
实验裂缝岩心为石英砂环氧树脂胶结均质岩心，由两块外观几何尺寸：高×宽×长=2.25cm×4.5cm×60cm组成，岩心渗透率Kg=150×10-3μm2，其结构示意图见图2。The experimental fracture core is a quartz sand epoxy resin cemented homogeneous core, which consists of two pieces of appearance geometric dimensions: height × width × length = 2.25cm × 4.5cm × 60cm, the core permeability Kg = 150 × 10-3 μm2 , its The schematic diagram of the structure is shown in Figure 2.
2、仪器设备2. Instruments and equipment
实验设备主要包括ISCO泵、压力传感器、岩心夹持器、手摇泵和中间容器等，除ISCO泵和手摇泵外，其它部分置于实验温度45℃下的恒温箱，设备及流程示意图见图3，注液流量为0.3mL/min，数据录取时间间隔为30min。The experimental equipment mainly includes ISCO pumps, pressure sensors, core holders, hand pumps and intermediate containers, etc. Except for the ISCO pumps and hand pumps, other parts are placed in a constant temperature box at an experimental temperature of 45°C. The equipment and process diagram are shown in Figure 3, the injection flow rate is 0.3mL/min, and the data acquisition time interval is 30min.
3、实验方法3. Experimental method
1）、将两块岩心称干重，抽空饱和实验用水，称湿重，计算孔隙体积；1) Weigh the dry weight of the two cores, evacuate and saturate the experimental water, weigh the wet weight, and calculate the pore volume;
2）、将两块岩心合并在一起，中间放入塑料隔层，并用聚四氟乙烯胶带缠绕岩心外部（端面除外），使其保持为一个整体。随后将岩心放入岩心夹持器中，在油藏温度条件下饱和模拟油。之后岩心静置24h，计算含油饱和度；2) Merge the two cores together, put a plastic interlayer in the middle, and wrap the outside of the core (except the end face) with polytetrafluoroethylene tape to keep it as a whole. The core is then placed in a core holder and saturated with simulated oil at reservoir temperature conditions. After that, the core was left to stand for 24 hours to calculate the oil saturation;
3）、水驱至含水95%，在采出端收集不同开采阶段采液量，计算含水率和采收率。3) Water flooding to 95% water cut, collect liquid production at different production stages at the production end, and calculate water cut and recovery factor.
4）、“先驱替后压裂”：从注入端以0.3mL/min注入速度注入6mL聚合物溶液后，将岩心从夹持器中取出，去掉岩心外部聚四氟乙烯生胶带和中间塑料隔层。根据实验设计裂缝穿透比，在岩心中间重新放入塑料隔层（隔层为带缝隔层，带缝段长度为裂缝长度1/4和缠绕聚四氟乙烯生胶带，然后放入岩心夹持器。在2MPa压差下注入压裂液，压裂液沿暴露裂缝壁滤失，并将流经区域剩余油推向岩心深部。收集采出液，计算滤失量；4), "Fracturing after Pioneer Replacement": After injecting 6mL of polymer solution from the injection end at an injection rate of 0.3mL/min, take the core out of the holder, remove the PTFE raw tape outside the core and the middle plastic spacer. Floor. According to the penetration ratio of the experimentally designed fractures, a plastic interlayer was placed in the middle of the core (the interlayer is a interlayer with a slit, and the length of the slit section is 1/4 of the length of the fracture and wrapped with polytetrafluoroethylene raw tape, and then put into the core clamp. Holder. The fracturing fluid is injected under 2MPa pressure difference, and the fracturing fluid will filter out along the exposed fracture wall, and push the remaining oil in the flowing area to the deep core. Collect the production fluid and calculate the fluid loss;
“直接压裂”：将岩心从夹持器中取出，去掉岩心外部聚四氟乙烯生胶带和中间塑料隔层。根据实验设计裂缝穿透比，在岩心中间重新放入塑料隔层（隔层为带缝隔层，带缝段长度为裂缝长度1/4和缠绕聚四氟乙烯生胶带，然后放入岩心夹持器。在2MPa压差下注入压裂液，压裂液沿暴露裂缝壁滤失，并将流经区域剩余油推向岩心深部。收集采出液，计算滤失量；"Direct fracturing": The core is removed from the holder, and the outer Teflon tape and the middle plastic spacer are removed from the core. According to the penetration ratio of the experimentally designed fractures, a plastic interlayer was placed in the middle of the core (the interlayer is a interlayer with a slit, and the length of the slit section is 1/4 of the length of the fracture and wrapped with polytetrafluoroethylene raw tape, and then put into the core clamp. Holder. The fracturing fluid is injected under 2MPa pressure difference, and the fracturing fluid will filter out along the exposed fracture wall, and push the remaining oil in the flowing area to the deep core. Collect the production fluid and calculate the fluid loss;
5）、重复上述实验步骤4中裂缝模拟工艺3次，每次增加隔层带缝段长度，增加值为裂缝长度1/4。5) Repeat the crack simulation process in the above experimental step 4 for 3 times, increasing the length of the cracked section of the interlayer each time, and the increased value is 1/4 of the crack length.
6）、后续水驱至含水95%，记录不同时间段出液量和出油量，计算采收率。6) Subsequent water flooding to 95% water cut, record the fluid output and oil output in different time periods, and calculate the recovery factor.
4、实验结果4. Experimental results
不同压裂施工工艺增油效果影响实验结果见表1。Table 1 shows the experimental results of the effect of different fracturing techniques on oil stimulation.
表1：采收率实验结果Table 1: Experimental results of recovery factor
从表1中可以看出，与“直接压裂”工艺相比较，“先驱替后压裂”工艺压裂施工后增油效果更好。It can be seen from Table 1 that, compared with the "direct fracturing" process, the "pioneer-replacement-after-fracturing" process has a better oil-increasing effect after fracturing.
实施例二Embodiment two
采用CMG软件建立数值模型进行压裂施工工艺效果数值模拟评价。CMG software was used to establish a numerical model for numerical simulation evaluation of fracturing construction process effects.
1、实验条件1. Experimental conditions
采用理想模型进行压裂液类型对压裂施工效果影响数值模拟研究。矿场实际井网为反九点井网，截取其1/4（1口注入井，3口生产井）建立地质模型，见图4。依据实际油藏情况，设计模型储层顶深为900m，小层厚度为4m，孔隙度为0.23，油水界面深度为909m。模型水平方向网格尺寸为5m×5m，纵向上裂缝处网格尺寸最小为0.01m，由裂缝向两侧网格尺寸逐渐增大至1m，见图5。设置900米处初始压力为11MPa，对一个初始不含气油藏执行重力-毛管力平衡初始化计算。依据重力-毛管力平衡对理想模型进行初始化，束缚水饱和度为0.3257。当井距为150m和渗透率为Kg=150×10-3μm2时，地质储量为1.410×104m3。The ideal model is used to carry out numerical simulation research on the effect of fracturing fluid type on fracturing operation effect. The actual well pattern of the mine is a reverse nine-point well pattern, and a quarter of it (1 injection well, 3 production wells) is intercepted to establish a geological model, as shown in Figure 4. According to the actual reservoir conditions, the reservoir top depth of the design model is 900m, the thickness of the small layer is 4m, the porosity is 0.23, and the oil-water contact depth is 909m. The grid size in the horizontal direction of the model is 5m×5m, and the minimum grid size at the crack in the vertical direction is 0.01m, and the grid size gradually increases to 1m from the crack to both sides, as shown in Figure 5. The initial pressure at 900 meters is set to 11 MPa, and the gravity-capillary force balance initialization calculation is performed for an initially gas-free reservoir. The ideal model is initialized according to the gravity-capillary force balance, and the irreducible water saturation is 0.3257. When the well spacing is 150m and the permeability is Kg=150×10-3 μm2 , the geological reserves are 1.410×104 m3 .
2、方案设计2. Scheme design
目标井组中注入井（INJECTOR）进行定压（13MPa）水驱开发，当油井综合含水达到60%时，对该井组3口油井（PROD1、PROD2和PROD3）进行压裂。压裂施工后，井组继续实施定压（13MPa）水驱开发，计算目标井组压裂施工后2年内累计增油量和采收率。The injection well (INJECTOR) in the target well group is developed with constant pressure (13MPa) water flooding. When the comprehensive water cut of the oil well reaches 60%, 3 oil wells (PROD1, PROD2 and PROD3) in the well group are fractured. After the fracturing operation, the well group continued to implement constant pressure (13MPa) water flooding development, and the cumulative oil increase and recovery rate within 2 years after the fracturing operation of the target well group were calculated.
在注采井井距、储层平均渗透率、压裂时机（压裂时油井含水率）和裂缝穿透比等参数值固定条件下，分别对比“直接压裂”（压裂液为聚合物凝胶压裂液）和“先驱替后压裂”（前置段塞为聚合物溶液，压裂液为聚合物凝胶压裂液）两种工艺数值模拟增油效果，聚合物溶液、压裂液性能与实例1物理模拟实验一致。Under the conditions of fixed injection-production well spacing, average reservoir permeability, fracturing timing (water content of oil well during fracturing) and fracture penetration ratio, the direct fracturing (fracturing fluid is polymer gel fracturing fluid) and “pioneer-replacement fracturing” (the front slug is polymer solution, and the fracturing fluid is polymer gel fracturing fluid) to numerically simulate the oil stimulation effect. The cracking fluid performance is consistent with the physical simulation experiment of Example 1.
3、结果分析3. Analysis of results
压裂方式对目标井组聚合物压裂增油效果影响数值模拟结果见表2。The numerical simulation results of the effects of fracturing methods on the oil enhancement effect of polymer fracturing in the target well group are shown in Table 2.
表2 ：压裂增油效果Table 2: Oil stimulation effect of fracturing
从表2可以看出，压裂滤失方式不同，采收率增幅不同，与“直接压裂”方式相比，“先驱替后压裂”方式的采收率增幅较高。It can be seen from Table 2 that different fracturing fluid loss methods lead to different recovery rate increases. Compared with the "direct fracturing" method, the "first fracturing" method has a higher recovery rate increase.
以上所述仅为本发明的个案实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only individual case embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention. within.
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| CN201710342086.XACN106958437B (en) | 2017-05-16 | 2017-05-16 | A kind of wellfracturing raising recovery ratio new method |
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| CN (1) | CN106958437B (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109594959A (en)* | 2018-10-31 | 2019-04-09 | 东北石油大学 | A kind of pressure break flooding method improving old filed thin and poor layer harvesting business efficiency |
| CN113187458A (en)* | 2021-05-31 | 2021-07-30 | 新疆正通石油天然气股份有限公司 | Method for improving recovery ratio by injecting oil displacement agent into oil layer by using fracturing pad fluid |
| CN114324073A (en)* | 2021-11-22 | 2022-04-12 | 中国石油天然气股份有限公司 | Porous medium oil displacement system screening method and application |
| CN117468908A (en)* | 2023-12-04 | 2024-01-30 | 东北石油大学 | Novel method for improving recovery ratio of pressure flooding of medium-low permeability reservoir |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4017119A (en)* | 1976-03-25 | 1977-04-12 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method for rubblizing an oil shale deposit for in situ retorting |
| CN1291253A (en)* | 1998-04-06 | 2001-04-11 | 大庆石油管理局 | foam complex flooding method |
| CN102587880A (en)* | 2012-03-05 | 2012-07-18 | 中国石油天然气股份有限公司 | Oil recovery method |
| WO2013163645A1 (en)* | 2012-04-27 | 2013-10-31 | The Trustees Of Columbia University In The City Of New York | Methods and systems for causing reaction driven cracking in subsurface rock formations |
| CN103615228A (en)* | 2013-11-26 | 2014-03-05 | 中国石油天然气股份有限公司 | Temporary plugging and fracturing process in degradable fiber seam |
| CN103939078A (en)* | 2014-03-27 | 2014-07-23 | 上海井拓石油开发技术有限公司 | Equal-fluidity fuel scavenge and fracturing integrated technology |
| CN104790928A (en)* | 2015-04-07 | 2015-07-22 | 东北石油大学 | Method for increasing crude oil recovery ratio of post-polymer flooding slug combination system |
| CN106246150A (en)* | 2016-09-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Oil field fracturing transformation method |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4017119A (en)* | 1976-03-25 | 1977-04-12 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method for rubblizing an oil shale deposit for in situ retorting |
| CN1291253A (en)* | 1998-04-06 | 2001-04-11 | 大庆石油管理局 | foam complex flooding method |
| CN102587880A (en)* | 2012-03-05 | 2012-07-18 | 中国石油天然气股份有限公司 | Oil recovery method |
| WO2013163645A1 (en)* | 2012-04-27 | 2013-10-31 | The Trustees Of Columbia University In The City Of New York | Methods and systems for causing reaction driven cracking in subsurface rock formations |
| CN103615228A (en)* | 2013-11-26 | 2014-03-05 | 中国石油天然气股份有限公司 | Temporary plugging and fracturing process in degradable fiber seam |
| CN103939078A (en)* | 2014-03-27 | 2014-07-23 | 上海井拓石油开发技术有限公司 | Equal-fluidity fuel scavenge and fracturing integrated technology |
| CN104790928A (en)* | 2015-04-07 | 2015-07-22 | 东北石油大学 | Method for increasing crude oil recovery ratio of post-polymer flooding slug combination system |
| CN106246150A (en)* | 2016-09-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Oil field fracturing transformation method |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109594959A (en)* | 2018-10-31 | 2019-04-09 | 东北石油大学 | A kind of pressure break flooding method improving old filed thin and poor layer harvesting business efficiency |
| CN109594959B (en)* | 2018-10-31 | 2021-02-05 | 东北石油大学 | A fracturing and flooding method for improving the economic efficiency of recovery of thin and poor reservoirs in old oilfields |
| CN113187458A (en)* | 2021-05-31 | 2021-07-30 | 新疆正通石油天然气股份有限公司 | Method for improving recovery ratio by injecting oil displacement agent into oil layer by using fracturing pad fluid |
| CN113187458B (en)* | 2021-05-31 | 2023-05-12 | 新疆正通石油天然气股份有限公司 | Method for injecting oil displacement agent into oil layer by using fracturing pad fluid to improve recovery ratio |
| CN114324073A (en)* | 2021-11-22 | 2022-04-12 | 中国石油天然气股份有限公司 | Porous medium oil displacement system screening method and application |
| CN114324073B (en)* | 2021-11-22 | 2024-04-30 | 中国石油天然气股份有限公司 | Screening method and application of porous medium oil displacement system |
| CN117468908A (en)* | 2023-12-04 | 2024-01-30 | 东北石油大学 | Novel method for improving recovery ratio of pressure flooding of medium-low permeability reservoir |
| Publication number | Publication date |
|---|---|
| CN106958437B (en) | 2019-03-15 |
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|---|---|---|
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