阅读说明：本技术 一种油气田钻井岩屑微生物发酵方法 (Microbial fermentation method for oil and gas field drilling rock debris ) 是由 李广平 姚留栓 刘世军 梅洋 李军 王瑾 刘开拓 王兆礼 思志银 张海东 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种油气田钻井岩屑微生物发酵方法,其包括如下步骤：(1)钻井岩屑筛分搅拌；(2)铺设供气管路；(3)分层码垛；(4)生物通风发酵。本发明的优点：本发明发酵方法将钻井岩屑由第Ⅱ类一般工业固体废物,转变为一般固废I类,达到《一般工业固体废物贮存、处置场污染控制标准》(GB18599—2001)及其修改单标准；可以用于废旧坑矿治理,生态修复、植被用土、路基土制作等,从而达到对钻井岩屑进行集中化、资源化和无害化处理目的,实现资源重复利用、保护生态环境的目标。本发明具有适应性范围广、生产成本低、施工工艺简便、修复效果好等优点。(The invention discloses a microbial fermentation method of drilling rock debris in an oil and gas field, which comprises the following steps: (1) sieving and stirring the drilling cuttings; (2) laying an air supply pipeline; (3) layering and stacking; (4) and (5) biological ventilation fermentation. The invention has the advantages that: the fermentation method of the invention converts the drill cuttings from the general industrial solid wastes of the type II into the general solid wastes of the type I, and reaches the pollution control standard of the general industrial solid wastes storage and disposal site (GB 18599-2001) and the modification single standard thereof; the method can be used for waste pit and mine treatment, ecological restoration, vegetation soil, roadbed soil production and the like, thereby achieving the purposes of centralized, resource and harmless treatment of the drilling rock debris, and realizing the purposes of resource recycling and ecological environment protection. The invention has the advantages of wide adaptability range, low production cost, simple and convenient construction process, good repairing effect and the like.)

1. A microbial fermentation method for drilling rock debris in an oil and gas field is characterized by comprising the following steps: (1) sieving and stirring the drilling cuttings; (2) laying an air supply pipeline; (3) layering and stacking; (4) biological ventilation fermentation, wherein,

(1) screening and stirring drilling cuttings: sieving the drill cuttings to remove large blocks of more than 5cm, adding organic matters as a loosening agent according to the weight ratio of 2-5%, and uniformly mixing to obtain a material to be fermented;

(2) laying an air supply pipeline: laying a layer of air supply pipeline every 1-2 meters from bottom to top;

(3) layering and stacking: after the gas supply pipeline is paved, stacking the fermentation materials, wherein the thickness of each stacking is 0.5 m, and respectively spraying a complex microbial inoculum and a nutrient solution according to the weight proportion of 1-2% of dry matters;

(4) and (3) biological ventilation fermentation: and (3) after the stacking is finished, starting biological fermentation, and completing the fermentation when the content of the petroleum solvent in the fermentation material is not higher than 1000mg/kg and the pH value is 6.0-8.0.

2. The microbial fermentation method of oil and gas field drilling debris according to claim 1, wherein in the step (4), the fermentation temperature is as follows: ventilating at 25 deg.C for 30 min every 12 hr; air supply quantity is 5000m³Min; during the fermentation treatment, the fermentation is maintainedThe water content of the material is 20-25%.

3. The microbial fermentation method of the oil and gas field drilling rock debris according to claim 1, wherein the organic matter is sawdust or straw or a mixture of sawdust and straw in any proportion.

4. The microbial fermentation method of oil and gas field drilling debris according to claim 1, wherein in the step (3), the stacking height is 3-4 meters.

5. The microbial fermentation method of oil and gas field drilling debris according to any one of claims 1 to 4, wherein the nutrient solution is 2.5% by mass of potassium dihydrogen phosphate aqueous solution.

6. The microbial fermentation method of oil and gas field drilling debris according to any one of claims 1 to 4, wherein the complex microbial inoculum comprises the following raw materials: acinetobacter calcoaceticus; b, bacillus subtilis; bacillus licheniformis; pseudomonas aeruginosa; gordonia paraffinophilum; pseudoochrobactrum saccharolyticum; micro-bacterium oxydans; achromobacter denitrificans.

7. The microbial fermentation method of the oil and gas field drilling rock debris according to claim 6, wherein the complex microbial inoculum comprises the following raw materials in parts by weight: 1-10 parts of acinetobacter calcoaceticus; 10-20 parts of bacillus subtilis; 1-5 parts of bacillus licheniformis; 5-15 parts of pseudomonas aeruginosa; 1-25 parts of gordonia paraffinophila; 10-15 parts of pseudo-ochrobactrum saccharolyticum; 1-5 parts of microbacterium oxydans; 1-20 parts of achromobacter denitrificans.

8. The microbial fermentation method of oil and gas field drilling debris according to claim 7, wherein the complex microbial agent is a liquid preparation.

9. The microbial fermentation method of oil and gas field drilling debris according to claim 8, wherein the concentration of total viable bacteria in the complex microbial inoculum is 2.0-10.0 hundred million/ml.

10. The microbial fermentation method of oil and gas field drilling debris according to claim 9, wherein the complex microbial inoculant further comprises 0.5-5g/L of glucose; 0.2-10g/L of starch; 0.1-0.6g/L of monopotassium phosphate; dipotassium hydrogen phosphate 0.2-0.8g/L, vitamin B₁₂0.01-0.2g/L。

The technical field is as follows:

the invention relates to the technical field of microbial fermentation, in particular to a microbial fermentation method for drilling rock debris in an oil and gas field.

Background art:

the drilling rock debris generated in the oil-gas exploration and development process is waste discharged from a solid control system by drilling fluid carrying drill cuttings in the drilling process, is a multiphase stable colloidal suspension system, contains clay, various chemical treatment agents, sewage, dirty oil, drill cuttings and the like, is a main pollutant generated in the oil-gas exploration and development process, has the characteristics of high pH, high COD (chemical oxygen demand), high stability, high salt content, poor biodegradability and the like, and is directly discharged to have great harm to the ecological environment. Improper disposal and excessive discharge of drilling cuttings can cause severe pollution of various environmental media, such as soil, surface water and groundwater. In order to ensure the ecological environment health, the harmlessness and the resource of the drilling rock debris are widely concerned.

At present, the treatment of the drilling cuttings is mainly used for manufacturing baking-free bricks, and the defects of the baking-free brick processing cuttings are that the dosage is small, the cost is high, and the market demand of the baking-free bricks is small.

The invention content is as follows:

the invention aims to provide a microbial fermentation method for well drilling rock debris in an oil and gas field, which can achieve the aims of centralized, resource and harmless treatment of the well drilling rock debris, realizes resource recycling, protects ecological environment, and has the advantages of wide adaptability range, low production cost, simple and convenient construction process and good repair effect.

The purpose of the invention is implemented by the following technical scheme: a microbial fermentation method for drilling rock debris of an oil and gas field comprises the following steps: (1) sieving and stirring the drilling cuttings; (2) laying an air supply pipeline; (3) layering and stacking; (4) biological ventilation fermentation, wherein,

(1) screening and stirring drilling cuttings: sieving the drill cuttings to remove large blocks of more than 5cm, adding organic matters as a loosening agent according to the weight ratio of 2-5%, and uniformly mixing to obtain a material to be fermented;

(2) laying an air supply pipeline: laying a layer of air supply pipeline every 1-2 meters from bottom to top;

(3) layering and stacking: after the gas supply pipeline is paved, stacking the fermentation materials, wherein the thickness of each stacking is 0.5 m, and respectively spraying a complex microbial inoculum and a nutrient solution according to the weight proportion of 1-2% of dry matters;

(4) and (3) biological ventilation fermentation: and (3) after the stacking is finished, starting biological fermentation, and completing the fermentation when the content of the petroleum solvent in the fermentation material is not higher than 1000mg/kg and the pH value is 6.0-8.0.

Preferably, in the step (4), the fermentation temperature is: ventilating at 25 deg.C for 30 min every 12 hr; air supply quantity is 5000m³Min; during the fermentation treatment process, the water content of the fermentation material is kept at 20-25%.

Preferably, the organic matter is sawdust or straw or a mixture of sawdust and straw in any proportion.

Preferably, in the step (3), the stacking height is 3-4 m.

Preferably, the nutrient solution is 2.5% potassium dihydrogen phosphate water solution.

Preferably, the complex microbial inoculum comprises the following raw materials: acinetobacter calcoaceticus; b, bacillus subtilis; bacillus licheniformis; pseudomonas aeruginosa; gordonia paraffinophilum; pseudoochrobactrum saccharolyticum; micro-bacterium oxydans; achromobacter denitrificans.

Preferably, the complex microbial inoculum comprises the following raw materials in parts by weight: 1-10 parts of acinetobacter calcoaceticus; 10-20 parts of bacillus subtilis; 1-5 parts of bacillus licheniformis; 5-15 parts of pseudomonas aeruginosa; 1-25 parts of gordonia paraffinophila; 10-15 parts of pseudo-ochrobactrum saccharolyticum; 1-5 parts of microbacterium oxydans; 1-20 parts of achromobacter denitrificans.

Preferably, the complex microbial inoculum is a liquid preparation.

Preferably, the concentration of total viable bacteria in the composite microbial inoculum is 2.0-10.0 hundred million/ml.

Preferably, the complex microbial inoculum also comprises 0.5-5g/L of glucose; 0.2-10g/L of starch; 0.1-0.6g/L of monopotassium phosphate; dipotassium hydrogen phosphate 0.2-0.8g/L, vitamin B₁₂0.01-0.2g/L。

The invention has the advantages that:

the invention realizes the effective degradation and transformation of pollutants in the rock debris through the synergistic effect of the throwing of the composite functional strains and the induction and activation of indigenous microorganisms such as indigenous actinomycetes. Adopting artificial strengthening measures to the drill cuttings stack to promote the growth of indigenous microorganisms and exogenous microorganisms with pollutant degradation capability in the drill cuttings and degrade pollutants in the drill cuttings, including harmful substances such as petroleum hydrocarbon, COD and the like; the drilling rock debris is converted from the general industrial solid waste of the second class into the general solid waste of the first class, and the drilling rock debris reaches the pollution control standard of the general industrial solid waste storage and disposal site (GB 18599-2001) and the single modification standard thereof; the method can be used for waste pit and mine treatment, ecological restoration, vegetation soil, roadbed soil production and the like, thereby achieving the purposes of centralized, resource and harmless treatment of the drilling rock debris, and realizing the purposes of resource recycling and ecological environment protection. The invention has the advantages of wide adaptability range, low production cost, simple and convenient construction process, good repairing effect and the like.

The specific implementation mode is as follows: