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The oil well anticorrosion biochemical treatment technology

Preservation using biochemical methods


As the oilfield enters the middle and late stage of production, the water produced by the oil well contains abundant sulfide and sulfate reducing bacteria (SRB). If the water contains the largest sulfide, it will cause serious corrosion and scaling in the surface and underground production equipment. The sulfide or H2S generated by the sulfate reducing bacteria during the reproduction process will corrode the steel and form a odorous black phosphatide. When the accumulation of iron deposits and FeS reaches a certain amount, it may cause the internal short circuit of the electric dehydrator to jump the network, which will bring serious hidden dangers to the production. At the same time, the H2S and other gases produced by the reaction not only seriously pollute the environment, but also threaten people's lives.

随着油田进入中后期开采,油井采出水中,硫化物和硫酸盐还原菌(SRB )大量存在。水中如果含有大最的硫化物, 将使地表和地下生产设备中产生严重的腐蚀和结垢a硫酸盐还原菌在繁殖过程中生成的硫化物或H2S会腐蚀钢铁,形成有臭味的黑色疏化铁沉积物,FeS等聚集达到一定量时可能造成电脱水器内部短路而跳网,这将给生产带来严重的事故隐患。同时,由于反应所产生的H2S等气体,不仅严重污染环境,更威胁人们的生命安全。

The study found that FeS is amorphous and fine particles, generally below 1 micron and has lipophilicity, so FeS suspended in water is difficult to remove, and newly injected water enters the formation to cause blockage, which affects the water injection capacity and increases the energy consumption of water injection. , affecting the normal production of oil fields.



For example: H2S acid corrosive gas commonly exists in the oil and gas of oil wells in a certain block of Huabei Oilfield, and the content is as high as 397.6 ~ 440.2mg/l: a large number of sulfate-reducing bacteria (SRB) and saprophytic bacteria are commonly found in oil wells

(TGB) o SRB bacterial content was as high as >105/ml; SO42- content of some oil wells was as high as 1000mg/L or more, and the average SO42- content of the whole system was 653.8mg/Lo under anaerobic conditions, containing S. Sewage with 42-acid ions accelerates SRB bacterial growth, thereby accelerating metal corrosion, as shown in Figure 1.

例如:华北油田某区块油井油气中普遍存在着H2S酸性腐蚀气体,含量高达397.6 ~440.2mg/l:油井普遍存在大量的硫酸盐还原菌(SRB )及腐生菌(TGB ) o SRB细菌含量均高达>105个/ ml;部分油井SO42-含量高达1000mg/ L以上,整个系统SO42-平均含量为 653.8mg/Lo在无氧条件下,含有SO42- 酸根离子的污水会加速SRB细菌繁殖,由此加速了金属腐蚀,如图1。

In order to ensure the normal production of the oil field, it is necessary to adopt effective methods to eliminate sulfides. But at present, many technicians have misunderstood the essence of the problem, thinking that eliminating sulfate-reducing bacteria can solve the problem, but this is not the case: first, sterilization is only temporary, and long-term use of fungicides will make SRB resistant to drugs; Second, the deposited sulfide has nothing to do with the addition of fungicides, FeS will still be formed, and corrosion still occurs; third, the addition of fungicides will also have a negative impact on oilfield water treatment.

为了保证油田的正常生产.需要采用行之有效的方法来消除硫化物。但目前不少技术人员对问题实质认识陪入误区之中,认为消除硫酸盐还原菌就能解决向题,其实不然:其一,杀菌只是暂时的,长期使用杀菌剂会使SRB产生抗药性;其二,已経存布的硫化物与杀菌            剂的加入无关,FeS还会形成,腐蚀仍在发生;其三,加入杀菌剂也会对油田水处理产生负 面影响。

What we use most in this oilfield is to add oxidative streaks to water to reduce SRB to achieve the purpose of reducing phosphatides. This method can also be maintained for a short period of time, and cannot fundamentally solve the problem. On the one hand, the variety of fungicides needs to be changed frequently, and on the other hand, there are disadvantages of large dosage. Therefore, we use biochemical methods to directly eliminate Sulfide, while forming a dominant environment for beneficial bacteria, inhibits the reproduction of SRB. The new sulfide is metabolized by the beneficial bacteria in an instant. It has achieved a good antiseptic effect in the field application.

我们在这个油田应用最多的是向水 中投加氧化型条菌剂降低SRB来达到降低 疏化物的目的。这种方法也能维持很短的一段时间,并不能从根本上解决问题,一方面需要经常更换杀菌剂的品种,另一方面,存在加药量大的弊病,因此,我们采用生化方法直接消除硫化物,形成有益菌群的优势环境的同时,抑制了SRB的繁殖。新的硫化物在瞬间被有益菌群所代谢.在现场应用取得了很好的防腐效果。

Principle of Biochemical Anticorrosion Technology


The oil well biochemical anti-corrosion technology replaces the previous negative treatment methods with modern positive treatment methods. While eliminating sulfides, it cuts off the living environment and conditions of sulfate-reducing bacteria, and produces bacterial symbiotic antagonism to reduce the number of SRB produced fluids. This method firstly removes sulfide, and at the same time inhibits or greatly reduces sulfate-reducing bacteria. Under the treatment of biochemical anti-corrosion technology, because of the formation of a strong environment of beneficial bacteria, the sulfide will always be kept below a very low standard, even if The existence of a certain number of sulfate-reducing bacteria will not increase the sulfide, and the sulfide they produce will be metabolized by the beneficial bacteria (LNB) in an instant. In this way, the underground and surface equipment of the oil well will be in a virtuous cycle.

油井生化防腐技术用现代积极的处 理手段代替以往消极的处理方法,在消除 硫化物的同时,切断硫酸盐还原菌的生存环境和条件,并产生细菌共生拮抗来降低 SRB采出液中的数量。这种方法首先是去除了硫化物,同时抑制或大大降低硫酸盐还原菌。在生化防腐技术处理下,因为形成了有益菌群的强势环境,硫化物始终会保持在极低的标准以下,即使存在一定数量的硫酸盐还原菌也不会使硫化物升高,它们产生的硫化物在瞬间将被有益菌群 (LNB )代谢掉。这样,油井的地下、地面设备将处于一种良性循环状态。

Live application


An oilfield has entered a period of medium and high water cut, and the on-site observation found that the associated water was early black and contained a large amount of powder, which is a typical corrosion characteristic of sulfate reducing bacteria (SRB). Sampling and analyzing the bacterial content, the sulfate-reducing bacteria reaches more than 10,000/ml, and does not contain saprophytic bacteria (TGB) o High-concentration bacterial activity destroys the protective film on the surface of the rod tube, and the iron corrosion product of SRB-FeS particles is extremely fine, It has a strong adsorption capacity, and FeS particles continue to adsorb and grow, and gradually deposit in the pump cylinder. In the past, the method we adopted was to add corrosion inhibitor to the oil well regularly. Although it has a certain effect, it needs to change the type of agent frequently. At the same time, it still cannot solve the problem that FeS particles are deposited in the pump barrel, resulting in the average pump inspection cycle of oil wells only two months. In 2007, the oilfield adopted biochemical anti-corrosion technology, and the produced water treated with biochemical preparations was subjected to a coupon test3. The test results show that this method can effectively inhibit the reproduction of SRB, and the corrosion rate is significantly reduced.

    某油田已进入中高含水期,现场观察发现伴生水早黑色,含大量粉末,是典型的硫酸盐还原菌(SRB )腐蚀特征。取样分析细菌含量,硫酸盐还原菌达到10000个/ml以上,不含腐生菌(TGB )。高浓度的细菌活动破坏了杆管表面的保护膜,另外SRB的铁腐蚀产物一FeS颗粒极细,有很强的吸附能力,FeS颗粒不断吸附长大,逐渐沉积在泵筒聖,堆积到一定程度造成光杆下不去。以往我们采取的方法是向油井中定期加入缓蚀剂,虽然有一定的效果,但需要经常更换药剂类型,同时,仍然解决不了FeS颗粒沉积在泵筒中这一问题,致使油井检泵周期平均只有两个月。2007年,该油田采用了生化防腐技术,并对生化制剂处理后的采出水做了挂片试验3试验结果表明,该方法能有效抑制SRB繁殖,腐蚀率明显下降。




Typical well example. Pu 95-7 was seriously corroded. It was operated for 3 times in the first half of 2007. The on-site observation found that the produced water was black and contained a lot of powder, which is a typical corrosion characteristic of sulfate reducing bacteria (SRB). Sampling and analyzing the bacterial content, the result is 12,000 sulfate-reducing bacteria/mh

典型井例.普95-7腐蚀严重,2007年上半年共作业3次,现场观察发现采出水呈黑色,含大量粉末,是典型的硫酸盐 还原菌(SRB )腐蚀特征。取样分析细菌含量,结果是硫酸盐还原菌12000个/mh。

How to control the content of SRB is our primary problem to solve. Without too many options to choose from, we have done an indoor test of biochemical preparations on the water. The test results show that the biochemical preparations can effectively inhibit the reproduction and corrosion of SRB. rate dropped significantly.


On June 27, 2007, the oilfield cleaned well Jin 95-7. On June 30, 200Kg of biochemical preparation was added to Well Jin 95-7 for the first time, and 150Kg was added for the second time on July 16. The produced water was continuously observed. From the monitoring results, the bacterial content is stable at 100/ml, the corrosion rate is within 0.09mrm/a, the sewage becomes clear, and the black suspended solids are significantly reduced, indicating that the FeS content of the SRB corrosion product has decreased and the corrosion has been inhibited. °The oil well pump inspection cycle has been extended. At present, the cycle of adding biochemical preparations to oil wells is 10 days, and the dosage is 60mg/l.

2007年6月27日,油田对晋95-7井进行了洗井,6月30日首次在晋95-7井 加入200Kg生化制剂,7月16日第2次加 入150Kg,连续观察产出水中的细菌含量和腐蚀率,从监测结果看细菌含量稳定 在100个/ml,腐蚀率在0.09mrm/a以内, 污水变清,黑色悬浮物明显减少,说明 SRB腐蚀产物FeS含量下降,腐蚀得到抑 制°油井检泵周期得到了延长,目前油 井加入生化制剂的周期为10天,加量为 60mg/l。


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Keywords关键词: CCSC Technology,Oil well anticorrosion;,biochemical treatment technology,corrosion,Sulfide, sterilization, biochemical method anticorrosion,technical principle, field application,SRB.CCSC技术,油井防腐,生化处理技术,腐蚀,硫化,杀菌,生化法防腐,技术原理,现场应用,SRB

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