阅读说明：本技术 一种油气田废弃泥浆处理方法 (Method for treating waste slurry of oil and gas field ) 是由 隋维华 陆明德 高希法 马洪波 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种油气田废弃泥浆处理方法,属于废弃物处理领域。该方法包括以下步骤：S1.利用处理剂对油气田废弃泥浆进行预处理后,进行泥水分离,得到固态泥浆；S2.将固态泥浆与掺料混合闷料发酵一定时间,得到种植土。与现有技术相比,本发明处理方法为油气田废弃泥浆拓展了新的应用领域,具有工艺简单、处理成本低、经济收益好等特点,具有良好的推广应用价值。(The invention discloses a method for treating waste slurry of an oil and gas field, and belongs to the field of waste treatment. The method comprises the following steps: s1, pretreating oil-gas field waste slurry by using a treating agent, and then carrying out mud-water separation to obtain solid slurry; s2, mixing the solid mud with the admixture, and fermenting for a certain time to obtain the planting soil. Compared with the prior art, the treatment method provided by the invention expands a new application field for the waste slurry of the oil and gas field, has the characteristics of simple process, low treatment cost, good economic benefit and the like, and has good popularization and application values.)

1. The method for treating the waste mud in the oil and gas field is characterized by comprising the following steps of:

s1, pretreating the oil-gas field waste slurry by using a treating agent, separating mud and water to obtain solid slurry,

the treating agent comprises ferrous sulfate solution, ammonium sulfate solution, polyaluminium chloride solution and/or potassium permanganate solution;

s2, mixing the solid mud with the admixture, and fermenting for a certain time to obtain the planting soil.

2. The oil and gas field waste mud treatment method according to claim 1, characterized in that: in the step S2, during the blank fermentation, a proper amount of aluminum powder is added into the solid slurry, and the weight ratio of the aluminum powder to the solid slurry is (1-2): 60.

3. The oil and gas field waste mud treatment method according to claim 1 or 2, characterized in that: the admixture in the step S2 includes a mixture of two or more of sand, coal cinder, perlite, wood chips, weeds, animal manure, platycodon grandiflorum, egg shell powder or shell powder.

4. The oil and gas field waste mud treatment method according to claim 3, characterized in that: the weight ratio of the admixture to the solid slurry is (30-50): 60.

5. The oil and gas field waste mud treatment method according to claim 1 or 2, characterized in that: the fermentation time of the blank material is not less than 7 days.

6. The oil and gas field waste mud treatment method according to claim 1 or 2, characterized in that: the weight ratio of each treating agent to the waste mud is (5-15): 100.

7. The oil and gas field waste mud treatment method according to claim 1 or 2, characterized in that: the concentration of the ferrous sulfate solution is 20-65%.

8. The oil and gas field waste mud treatment method according to claim 1 or 2, characterized in that: the concentration of the ammonium sulfate solution is 5-15%.

9. The oil and gas field waste mud treatment method according to claim 1 or 2, characterized in that: the concentration of the polyaluminium chloride solution is 10-20%.

10. The oil and gas field waste mud treatment method according to claim 1 or 2, characterized in that: the concentration of the potassium permanganate solution is 0.5-1%.

Technical Field

The invention relates to the field of waste treatment, in particular to a method for treating waste mud in an oil and gas field.

Background

Disclosure of Invention

The technical task of the invention is to provide a method for treating the waste slurry of the oil and gas field, which has simple process and good economic benefit.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for treating waste mud in oil and gas fields comprises the following steps:

s1, pretreating the oil-gas field waste slurry by using a treating agent, separating mud and water to obtain solid slurry, wherein the water content of the solid slurry is 20-25%,

the treating agent comprises ferrous sulfate solution, ammonium sulfate solution, polyaluminium chloride solution and/or potassium permanganate solution;

s2, mixing the solid mud with the admixture, and fermenting for a certain time to obtain the planting soil.

After the oil and gas field waste slurry is pretreated, mud and water separated and stuff is sealed and fermented by the method, the weakly acidic soil suitable for the growth of various plants can be obtained. In order to further obtain neutral planting soil, a proper amount of aluminum powder can be added into the solid slurry during the material sealing fermentation in the step S2, and the weight ratio of the aluminum powder to the solid slurry is (1-2): 60.

The admixture in step S2 may be any one of inorganic admixture and/or organic admixture capable of increasing soil water permeability, air permeability and soil fertility in the prior art, and preferably, the admixture in step S2 includes a mixture of two or more of sand, coal cinder, perlite, wood dust, weeds, animal manure, platycodon grandiflorum, egg shell powder and shell powder. The weight ratio of inorganic additives such as sand, coal cinder, perlite, egg shell powder and shell powder to organic additives such as wood chips, weeds, animal manure and platycodon grandiflorum is preferably 3 (0.5-1.5).

The weight ratio of the admixture to the solid slurry is preferably (30-50): 60.

The fermentation time of the blank materials is not less than 7 days, and preferably 7 to 30 days.

Preferably, the weight ratio of each treating agent to the waste slurry in step 1 is (5-15): 100.

The concentration of the ferrous sulfate solution is preferably 20-65%, and the ferrous sulfate solution is used for breaking the gel of the slurry, reducing the pH value and reducing hexavalent chromium.

The concentration of the ammonium sulfate solution is preferably 5-15%, and the ammonium sulfate solution is used for reducing the pH value of slurry and improving the solubility of ferrous sulfate

The concentration of the polyaluminium chloride solution is preferably 10-20%, and the polyaluminium chloride solution is used for flocculation, peculiar smell removal and color removal.

The concentration of the potassium permanganate solution is preferably 0.5% -1%, and the potassium permanganate solution is used for degrading COD (chemical oxygen demand), TOD (total oxygen demand) and heavy metals.

Compared with the prior art, the method for treating the waste mud in the oil and gas field has the following beneficial effects:

1. the application field of the waste slurry of the oil and gas field is widened, and the economic benefit of a slurry treatment enterprise is favorably improved;

2. because the waste slurry of the oil and gas field is mostly taken from the deep ground, the planting soil obtained by the method does not contain harmful substances such as plant harmful bacteria, worm eggs and the like basically, has good water permeability and air permeability, is loose and fertile, and can be applied to greening planting of various scales;

3. the method can be realized on site, has simple process and low cost, and is beneficial to large-scale popularization and application.

Detailed Description

The method for treating waste slurry from oil and gas fields according to the present invention will be described in detail with reference to the following examples.