Microbiological treatment technology for oil-containing silt in oil field and processing system thereof

A microbial treatment, oil sludge sand technology, applied in the direction of biological sludge treatment, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of unrecoverable crude oil and long treatment period, and achieve short period and short treatment period , the effect of low cost

Pending Publication Date: 2018-11-16
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, biological treatment also has the disadvantages of long treatment period and inability to recover crude oil. It is necessary to combine other treatment technologies or optimize biological treatment methods to speed up the treatment.

Method used

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  • Microbiological treatment technology for oil-containing silt in oil field and processing system thereof
  • Microbiological treatment technology for oil-containing silt in oil field and processing system thereof
  • Microbiological treatment technology for oil-containing silt in oil field and processing system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 A kind of microbial treatment process of oilfield oily mud sand shown, comprises the following steps

[0044] Step 1: homogeneous detection

[0045] Inject the oil sludge sand to be treated into the microbial treatment device and mix it evenly to detect its oil content;

[0046] Step 2: Oil Slick Recovery

[0047] If the oil content of the oil sludge in the oil sludge sand is less than 5% by step 1, stir and mix the oil sludge sand evenly, inject clean water, and heat to 60-80°C, continue stirring, and after standing still, recover the upper oil slick through crude oil Device recycling;

[0048] If it is detected by step 1 that the oil content of the oil sludge is ≥ 5%, then stir and mix the oil sludge sand evenly, inject clean water, then add cleaning agents, and heat to 60-80°C, continue stirring, and after standing still, remove the upper oil slick Recycle and reuse through crude oil recovery unit;

[0049] Step 3: Sewage discharge

[0050] The se...

Embodiment 2

[0062] like figure 1 A kind of microbial treatment process of oilfield oily mud sand shown, differs from embodiment one in that:

[0063] Mix the tested oil sludge sand with an oil content of 10% evenly; use 5% sodium hydroxide solution, heat at 80°C, rotate at a speed of 40r / min, wash for 40min, and the crude oil removal rate is 50.55%; Bacillus (Bacillus encimensisstrain encimensis), Alcaligenesfaecalis strain, Pseudomonas stutzeri strain, Nocardioidesluteus, and Nocardioidesalbus The degrading bacteria are mixed according to the weight ratio of 1.5:1.5:1.5:3:2.5; nutrients such as carbon source, nitrogen source, inorganic salt and trace elements are added, and straw is added as a leavening agent to make a solid composite microbial agent. Add the above-mentioned solid composite microbial agent into the reaction tank, stir evenly, and keep it warm at about 30°C. Add the composite biological agent every 7 days, and the addition amount is the same as the first time; until the ...

Embodiment 3

[0065] like figure 1 A microbial treatment process for oily mud sand in the shown oilfield is different from Example 1 in that the microbial composite bacterial agent in the step 4 is composed of multiple strains of degrading bacteria and surfactant-producing bacteria. Multiple strains of degrading bacteria include Bacillus encimensis strain encimensis, Alcaligenesfaecalis strain, Pseudomonas stutzeri strain, Nocardioidesluteus and white Nocardioides albus is mixed at a weight ratio of 1.5:1.5:1.5:3:2.5.

[0066] Preferably, the nutrient in Step 4 includes any one or a combination of inorganic nitrogen, phosphorus, potassium, magnesium, calcium, iron or copper elements.

[0067] Preferably, the nutrient in step 4 includes inorganic nitrogen, phosphorus, potassium and the mass ratio of inorganic nitrogen, phosphorus, potassium to carbon content in the sludge is 5-10:1:1:100.

[0068] It is preferred that the dehydration treatment in the step 5 adopts natural drying or vacuum ...

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Abstract

The invention belongs to the technical field of oil field environmental protection, and relates to a microbiological treatment technology for oil-containing silt in oil field and a processing system thereof. The method comprises seven steps of homogeneity detection, floating oil recovery, sewage discharge, microbe degradation, dehydration treatment, standard discharge of oil-containing silt, sewage purifying, and purified water reutilization, and the microbiological treatment system comprises a feeding apparatus, a microbiological treatment apparatus, a dehydrated apparatus, a sewage treatmentapparatus, a filtering apparatus, a water storage apparatus, a circulating pump, a crude oil retrieving apparatus, a control apparatus, and a circulating pump. The system has the advantages of simpleprocessing flow and short processing period, greatly recovers crude oil in the oil-containing silt, realizes harmlessness processing of the oil-containing silt, and has low cost, sewage in the system can be recycled, and a purpose of resourcing and harmlessness of the system can be achieved.

Description

technical field [0001] The invention belongs to the technical field of oil field environmental protection, and relates to a microbial treatment process and a treatment system for oily mud sand in an oil field. Background technique [0002] In the process of blowout and fluid drainage after oil well fracturing, fracturing flowback fluid, formation water mixed proppant, bottom hole rock debris and crude oil are returned from the well, and after solid-liquid separation, oil-containing proppant and oil-containing pressure The cracked flowback liquid enters the next processing flow. During the tripping process and the swabbing process, despite the laying of protective pads, it is inevitable that crude oil will be spilled around the wellhead, forming a small amount of oil sludge on the ground. It has been determined that the oil content ranges from 0.2% to 15.9%. It is estimated that only in the process of reservoir stimulation and testing for production, a single well produces a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/02C02F11/12C02F103/10
CPCC02F11/02C02F11/00C02F11/121C02F2103/10
Inventor 杨博丽徐迎新张冕王祖文高银锁兰建平陈文博姚兰席仲琛谢涛吴简李大维
Owner BC P INC CHINA NAT PETROLEUM CORP
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