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Solid-liquid separation method for oil-gas field waste water-based drilling fluid

A water-based drilling fluid, solid-liquid separation technology, applied in mining wastewater treatment, chemical instruments and methods, multi-stage water treatment, etc.

Active Publication Date: 2016-11-23
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The composition of waste water-based drilling fluid is relatively complex, the pollution is relatively large, and the impact on the environment is also multi-faceted. The main hazards are: (1) The pollution area is large and the area is wide, which is determined by the characteristics of drilling production fluidity; 2) Excessively high concentrations of soluble salts and organic matter affect the structure of the soil and endanger the growth of plants; (3) Contain heavy metal ions, which are not easy to be degraded by plants and animals, and can accumulate in the environment or in animals and plants, endangering human health

Method used

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  • Solid-liquid separation method for oil-gas field waste water-based drilling fluid

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Effect test

Embodiment 1

[0036] Solid-liquid separation method for waste water-based drilling fluid in eastern Sichuan. In this area, water-based drilling fluid with foam bentonite system is used in the first drilling stage, water-based drilling fluid in polymer system is used in the second drilling stage, and polysulfide is used in the third drilling stage. The system water-based drilling fluid; each stage is mixed with formation materials during the drilling process to form a corresponding system of waste water-based drilling fluid; the solid-liquid separation of the waste water-based drilling fluid at each stage is carried out as follows:

[0037] In the first stage, the waste water-based drilling fluid in the bentonite system adopts the static settlement method to allow the solid phase substances in it to settle naturally to form sludge, and then the filtration method is used to achieve solid-liquid separation.

[0038] Waste water-based drilling fluid for polymer system in the second stage, 1m 3 ...

Embodiment 2

[0127] Solid-liquid separation method of waste water-based drilling fluid in Xinjiang area.

[0128] In the first stage, the waste water-based drilling fluid in the bentonite system adopts the static settlement method to allow the suspended solid phase substances to settle naturally to form sludge, and then the filtration method is used to achieve solid-liquid separation;

[0129] Waste water-based drilling fluid for polymer system in the second stage, 1m 3 Add flocculant PAC14~15kg to the waste water-based drilling fluid to coagulate the solid phase substances, and then use filtration method to filter out the solid phase substances to realize solid-liquid separation;

[0130] Waste water-based drilling fluid of polysulfide system in the third and fourth opening stages, 1m 3 Add flocculant PAC 14-15kg and coagulant aid PAM 0.45-0.6kg to the waste water-based drilling fluid; make the solid phase substances in it condense, and then filter out the solid phase substances by filtr...

Embodiment 3

[0133] Solid-liquid separation method of waste water-based drilling fluid in western Sichuan.

[0134] Waste water-based drilling fluid of polymer system in the first stage, 1m 3 Add 10-11kg of gel breaker, 3-5kg of flocculant PAC, and 4-6kg of stabilizer to the waste water-based drilling fluid to break up the colloidal ions, release the liquid-phase substances, and condense the solid-phase substances. Solid-phase substances are released to achieve solid-liquid separation;

[0135] Waste water-based drilling fluid of polysulfide system in the second stage and later stage, 1m 3 Add 20kg of gel breaker, 3-4kg of flocculant PAC, and 10-12kg of stabilizer to the waste drilling fluid to break the colloidal ions, release the liquid phase and condense the solid phase, and then filter out the solid phase by filtration. Realize solid-liquid separation.

[0136] The screening of treatment agents and the determination of dosage are similar to those in Example 1, and will not be repeat...

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Abstract

The invention discloses a solid-liquid separation method for oil-gas field waste water-based drilling fluid. Mainly, a proper waste water-based drilling fluid destabilization reagent formula is screened out, waste water-based drilling fluid at various drilling stages of oil-gas fields in Xingjiang, the eastern Sichuan region and the western Sichuan region is subjected to gel breaking treatment, liquid-phase matter in the drilling fluid is completely released, solid-phase matter fully settles, solid-liquid separation is achieved through filtering, and preconditions are created for following filtrate treatment.

Description

technical field [0001] The invention relates to sewage treatment technology, in particular to a solid-liquid separation method in the treatment process of waste water-based drilling fluid in oil and gas fields. Background technique [0002] Drilling fluids in my country's oil and gas fields are mainly water-based drilling fluids, accounting for more than 90% of the total. Water-based drilling fluids are composed of the following parts: [0003] (1) Liquid phase: water added when preparing mud, oil added for lubrication, etc.; [0004] (2) Solid phase: bentonite, weighting agent, etc.; [0005] (3) Drilling fluid additives: Inorganic salts, organic substances, synthetic polymers, surfactants, etc. added to improve the performance of drilling mud. [0006] Waste water-based drilling fluid refers to the unusable mud formed in the process of drilling wells in oil and gas fields. It is a complex multiphase system. In addition to various substances added to the preparation of dr...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52C02F103/10
CPCC02F1/001C02F1/52C02F2001/007C02F2103/10C02F2301/08
Inventor 罗平凯杜利粟建辉罗荣川王平安王勋张霞玉欧仕军胡志勇宋佳邱林青汤潜凌兵
Owner 中石化石油工程技术服务有限公司
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