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Harmless treating and resource utilizing method for waste salt-containing drilling slurry in oil field

A waste mud and treatment method technology, applied in chemical instruments and methods, sludge treatment, waste treatment, etc., can solve problems such as salt ion adsorption, and achieve the effect of saving land resources and reducing pollution

Inactive Publication Date: 2002-09-25
黄大军
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

[0014] (A) Replacement step: solve the problem of salt ion adsorption

Method used

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  • Harmless treating and resource utilizing method for waste salt-containing drilling slurry in oil field
  • Harmless treating and resource utilizing method for waste salt-containing drilling slurry in oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] 1. Take 10 tons of saline waste mud and saline mud from drilling. And add 4 tons of water for dilution. Use a screw pump to inject into a flocculation tank with a volume of 10 tons.

[0049] 2. Prepare 1 ton of 0.1% polyacrylamide and 0.5 ton of 5% polyaluminum chloride.

[0050] 3. Add all the flocculants prepared in 1 and 2 into 10 tons of mud, stir for 3 minutes, and control the stirring speed at 15 rpm.

[0051] 4. Dehydrate the flocculated mud with a belt press vacuum dehydration equipment. The vacuum degree is controlled at 0.3 atmospheres. After the detached water is collected with a concentrated brine collection tank, it is washed four times. The first and second washing The concentrated brine is collected into the concentrated brine storage tank, and the third and fourth wash water are collected into the light brine storage tank. The salt ion concentration after mud washing is 260mg / L.

[0052] 5. Squeeze the desalted mud, modify the squeezed mud cake, (1) ...

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Abstract

The harmless treating and resource utilizing process of waste salt-containing drilling slurry in oil field includes the following steps: replacement step for flocculating slurry with flocculent to destroy its colloid state, convert adsorbed salt ion free state in water solution and separate water from slurry; wsater washing and dewatering step for water washing slurry for 3-6 times before eliminating water solution to eliminate salt in slurry; desalting step combining reverse osmosis and climbing film evaporation to eliminate salt in water; salt recovering step to crystallize salt in concentrated salt solution with solar energy; and optional step to utilize desalted slurry in soil improvement.

Description

field of invention [0001] The invention relates to a method for harmless treatment and resource utilization of waste drilling mud containing salt in oil fields. technical background [0002] In the oil industry, drilling is an essential part of oil production. During drilling, the proportion of drilling mud is prepared according to the proportion of formation minerals. Therefore, it is an inevitable process to generate waste mud during drilling. Because some formations contain a large amount of salt minerals, it is necessary to configure saturated brine mud when configuring drilling mud, so waste saline mud and drilling saline mud must be produced during the drilling process. The salinity components of waste saline mud and drilling saline mud mainly include the following types: NaCl, Na 2 SO 4 、NaNO 3 , KCl, K 2 SO 4 、KNO 3 , MgCl 2 , MgSO 4 , Mg(NO 3 ) 2 , CaCl 2 , CaSO 4 , Ca(NO 3 ) 2 and other substances. Saline waste mud exists in the mud pool, and the vol...

Claims

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Application Information

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IPC IPC(8): B09B3/00C02F11/00
CPCY02W30/20
Inventor 黄大军
Owner 黄大军
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