表面活性剂驱油与提高原油采收率(3/4): 砂岩与碳酸盐岩矿场应用

第三部分：砂岩与碳酸盐岩矿场应用

Part 3: Field Applications in Sandstone and Carbonate Reservoirs
随着对超低界面张力、润湿性反转以及微乳液相态行为等核心微观机理的深度理解，本部分将带领读者走出实验室，直面条件严苛的真实地质储层。我们将系统性地审查表面活性剂驱油技术在全球不同类型的主力油田（砂岩与碳酸盐岩）中取得的矿场应用成效，并借此分析真实工程实践中的物理与经济局限。
Having gained a deep understanding of core microscopic mechanisms such as ultra-low interfacial tension, 
wettability alteration
, and 
microemulsion
 phase behavior, this part will lead readers out of the laboratory to face real geological reservoirs with demanding conditions. We will systematically review the field application results of 
surfactant flooding
 technology in different types of major oilfields (sandstone and carbonate) globally, and use this to examine the physical and economic limitations encountered in real-world engineering practice.
将理想条件下配制的化学剂成百上千吨地注入地下两三千米的油藏中，是一项具有极高风险的多学科系统工程。真实油藏绝非均质的实验岩心，其内部布满了错综复杂的微裂缝、断层、以及天然的高渗透导流通道。同时，极高的地层温度、高浓度二价盐离子（如钙、镁）以及活跃的地球化学吸附反应，都在持续侵蚀表面活性剂的分子结构。针对砂岩油藏和碳酸盐岩油藏这两种截然不同的地质类型，全球工程师们采取了截然不同的配方定制与部署策略。
Injecting hundreds or thousands of tons of chemicals formulated under ideal conditions into reservoirs two to three thousand meters underground is a highly risky multidisciplinary systems engineering endeavor. Real reservoirs are by no means homogenous experimental cores; their interiors are riddled with intricate micro-fractures, faults, and natural high-permeability flow channels. Meanwhile, extreme formation temperatures, high concentrations of divalent salt ions (like calcium and magnesium), and active geochemical adsorption reactions continuously erode the molecular structures of surfactants. Tailoring to the starkly different geological types of sandstone and carbonate reservoirs, global engineers have adopted completely divergent formulation customization and deployment strategies.

在砂岩油藏的化学驱开发史上，中国的大庆油田是全球规模最大、最具代表性的成功案例，把实验室理论推向了工业化规模。针对大庆主力区块属于中高渗透、温度与矿化度相对温和的砂岩特征，大庆科研人员历经近30年攻关，成功开创并规模化应用了碱-表面活性剂-聚合物（ASP）三元复合驱技术。通过巧妙利用强碱与原油中天然存在的环烷酸发生化学反应，在地层深处原位生成天然皂类表面活性剂，再搭配人工合成注入的石油磺酸盐和高分子聚合物，该体系极大地降低了人工活性剂的注入量和总体成本，并在水驱已充分开发的基础上，将主力区块的原油采收率再提高了 20% 以上。然而，为了解决强碱长期注入导致的粘土严重水化膨胀、井筒及地面设备结垢受损等次生问题，大庆油田进行了技术革新，研制出了不依赖强碱的“弱碱化”或“无碱二元驱”体系。这些新型配方通过特定的石油羧酸盐或甜菜碱两性表面活性剂的复配，在无碱条件下依然实现了 24% 的采收率增幅，确立了其在全球三次采油领域的领先地位。在美国，Tanner油田（引入了ORS-41等药剂）和Wyoming州的Cambridge Minnelusa等砂岩区块也相继实施了成功的ASP与表面活性剂驱，证明了该技术在不同砂岩地质环境中的广泛适应性。
In the history of chemical EOR development for sandstone reservoirs, China’s Daqing Oilfield is the largest and most representative global success case, having carried laboratory theory to industrial scale. Tailoring to the mid-to-high permeability, relatively mild temperature, and moderate salinity characteristics of Daqing’s main sandstone blocks, Daqing researchers, after nearly 30 years of arduous research, successfully pioneered and deployed the Alkali-Surfactant-Polymer (ASP) composite flooding technology on a massive scale. By ingeniously utilizing strong alkalis to chemically react with naturally occurring naphthenic acids in crude oil, generating natural soap-based surfactants in situ deep within the formation, and coupling this with injected synthetic petroleum sulfonates and high-molecular-weight polymers, the system drastically reduced the injection volume and overall cost of artificial active agents. It increased crude oil recovery in the main blocks by over 20% beyond the already heavily depleted waterflooding baseline. However, to address secondary problems such as severe clay hydration swelling and wellbore/surface equipment scaling caused by prolonged strong alkali injection, Daqing Oilfield underwent technological innovation, developing “weak-alkali” or “alkali-free binary flooding” systems that do not rely on strong bases. These novel formulations, achieved by compounding specific petroleum carboxylates or betaine zwitterionic surfactants, achieved a 24% recovery increase even under alkali-free conditions, establishing a leading position in global tertiary recovery. In the United States, sandstone blocks such as the Tanner Field (introducing agents like ORS-41) and Cambridge Minnelusa in Wyoming have also successively implemented successful ASP and 
surfactant flooding
, proving the technology’s broad adaptability across various sandstone geological environments.

与砂岩相比，蕴藏了全球约60%剩余原油的碳酸盐岩油藏（如石灰岩和白云岩）长期被视为化学驱的“禁区”。碳酸盐岩的微观特性十分苛刻：它们普遍呈现强烈的亲油性（甚至混合润湿），裂缝发育使得注入水极易发生严重窜流而无法进入含油基质；更关键的是，其地层水中游离着极高浓度的二价钙、镁离子。传统的阴离子表面活性剂（如普通磺酸盐）一旦接触这些高价硬水离子，就会迅速形成不溶性沉淀，或被带正电的碳酸盐岩矿物表面巨量吸附，导致药剂失效。因此，碳酸盐岩中表活剂驱的机理应用侧重点，从单纯追求超低界面张力，战略性地转移到了极度强调岩石的
润湿性反转
和
渗吸排驱（Imbibition）
。
Compared to sandstones, carbonate reservoirs (such as limestones and dolomites)—which harbor roughly 60% of the world’s remaining crude oil—have long been regarded as a “no-go zone” for chemical flooding. The microscopic characteristics of carbonates are demanding: they generally exhibit strong oil-wetness (or mixed-wetness), and their developed fractures cause injected water to easily channel severely, failing to enter the oil-bearing matrix; most critically, their formation waters contain extremely high concentrations of free divalent calcium and magnesium ions. Traditional anionic surfactants (like ordinary sulfonates), once in contact with these high-valence hard water ions, rapidly form insoluble precipitates or are massively adsorbed by the positively charged carbonate mineral surfaces, leading to chemical failure. Consequently, the strategic focus of 
surfactant flooding
 mechanisms in carbonates shifted away from merely pursuing ultra-low interfacial tension towards extreme emphasis on 
wettability alteration
 and spontaneous 
imbibition
.

在著名的美国西德克萨斯Yates油田中，这一策略转变取得了明确成效。该油田的San Andres白云岩储层高度裂缝化，且黏度5-7 cP的原油使得岩石高度亲油，水驱扫油效率极差。工程师们摒弃了传统的阴离子配方，转而向油井注入针对性的非离子型乙氧基醇表面活性剂（如Aspiro S2420等药剂）。实验室数据证明，这些药剂将白云岩的接触角从强亲油的 148.93° 降至水湿状态的 65.54°，同时将界面张力从30 dynes/cm温和降至14 dynes/cm。这一改变随即触发了毛细管自发渗吸作用，水相被大量吸入低渗基质块中，将内部的残余油挤入高渗裂缝并产出，在单井吞吐先导试验中实现 3 个月累计增产 5800 桶。为进一步控制气窜，Yates油田还将表活剂作为发泡剂实施了泡沫复合驱，实验验证可额外获取13%至16%的原油回收率。
In the famous Yates Field of West Texas, USA, this strategic shift produced clear results. The field’s San Andres dolomite reservoir is highly fractured, and crude oil with a viscosity of 5-7 cP renders the rock highly oil-wet, resulting in extremely poor waterflooding sweep efficiency. Engineers abandoned traditional anionic formulations and instead injected targeted non-ionic ethoxy alcohol surfactants (such as Aspiro S2420) into the wells. Laboratory data proved that these agents reduced the dolomite’s contact angle from a strongly oil-wet 148.93° to a water-wet 65.54°, while gently reducing interfacial tension from 30 dynes/cm to 14 dynes/cm. This alteration triggered spontaneous capillary 
imbibition
; the water phase was massively sucked into the low-permeability matrix blocks, expelling the internal 
residual oil
 into high-permeability fractures for production, yielding 5,800 barrels of cumulative incremental oil in 3 months during a single-well huff-and-puff pilot test. To further control gas channeling, the Yates Field also implemented foam composite flooding by using surfactants as foaming agents; experiments verified this could yield an additional 13% to 16% oil recovery.

其他碳酸盐岩矿场同样取得了可验证的成效。德克萨斯的Bob Slaughter Block油田面对白云岩极高的地层水硬度，量身定制了耐高盐的石油磺酸盐与烷基芳基醚硫酸盐的混合体系，在没有淡水预冲洗的情况下，仍取得了 12% 的原油采收率（OOIP）增幅。而在Cretaceous Upper Edwards白云岩的试验中，通过在配方中引入三聚磷酸钠（STPP）配合Petrostep-B100表面活性剂，STPP有效螯合了二价离子并充当牺牲剂，使实验室岩心在水驱极限的基础上额外采出 45% 的残余油。怀俄明州的Cottonwood Creek油田则利用非离子聚氧乙烯醇表面活性剂成功改变地层润湿性，同样取得了约10.4%的OOIP增产。
Other carbonate fields report comparable, verifiable results. The Bob Slaughter Block field in Texas, facing extremely high formation water hardness in its dolomite, customized a highly salt-tolerant mixed system of petroleum sulfonates and alkylaryl ether sulfates. Even without a freshwater pre-flush, it achieved a 12% increase in Original Oil in Place (OOIP) recovery. Meanwhile, in trials on the Cretaceous Upper Edwards dolomite, by introducing Sodium Tripolyphosphate (STPP) alongside Petrostep-B100 surfactant in the formulation, STPP effectively chelated divalent ions and acted as a sacrificial agent, allowing laboratory cores to recover a further 45% of 
residual oil
 beyond the waterflooding limit. The Cottonwood Creek field in Wyoming successfully utilized non-ionic polyoxyethylene alcohol surfactants to alter formation wettability, similarly achieving a production increase of approximately 10.4% OOIP.

然而，在这些数据之外，工程上的现实约束依然存在。在上述所有成功项目的背后，是高昂的运营成本和化学剂在地层中严重的吸附损耗。如何在全球油价波动的今天，寻找到一条既能抵御地层苛刻环境，又能保持极高经济效益和环境友好度的道路，是行业必须跨越的关键门槛。
However, beyond these results, real engineering constraints remain. Behind all the aforementioned successful projects lie exorbitant operating costs and severe chemical 
adsorption
 losses within the formation. Amidst globally fluctuating oil prices today, discovering a path that can withstand harsh formation environments while maintaining immense economic viability and environmental friendliness is the decisive threshold the industry must cross.
下期预告：
第三部分呈现了工程实践与地质条件之间的真实张力，本系列文章的最后一部分将站在科研的最前线，深度剖析阻碍技术普及的关键痛点，并展望有望突破现有边界的新型表面活性剂材料与跨学科协同策略。


Next:
 Part 3 set out the real tension between engineering practice and geological limits, the final part of this series will stand at the forefront of scientific research, deeply analyzing the key pain points hindering technology popularization, and looking ahead to new surfactant materials and cross-disciplinary strategies that could move past current boundaries.