Drilling wastes recycling method

A drilling waste recycling technology, applied in chemical instruments and methods, mining wastewater treatment, special compound water treatment, etc., can solve the problems of incompatibility between economic benefits and environmental benefits, high and low cost of treatment, and achieve Ensure long-term stable operation, solve secondary pollution, and eliminate pollution effects

Active Publication Date: 2016-02-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these treatment methods basically have a problem that economic benefits and environmental benefits cannot be achieved at the same time. If the treatment effect is good, the treatment cost is too high and the process adaptability is not strong; if the cost is low, the treatment effect cannot meet the environmental protection requirements; at the same time, The above methods have certain requirements for the mud system, and are not suitable for all drilling waste mud treatment

Method used

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  • Drilling wastes recycling method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Utilize the method of the present invention to process the drilling waste of certain oil field C block, concrete steps are as follows:

[0025] (1) The drilling waste is sent to the shale shaker for primary purification, and the cuttings and sand that are larger than the diameter of the sieve hole in the drilling waste and partially smaller than the diameter of the sieve hole are solidified and removed by mechanical vibration.

[0026] Among them, the mud shaker is composed of a mud feed box, a screen box, a screen, a vibrator and a shock absorber. The mud feed box adopts a weir type, and the screen is a fully bonded ditch edge rigid screen. The size of the screen is 0.2~1.0mm; the adjustable range of screen box inclination is -2°~+1°.

[0027] The cuttings and sand obtained by solidification and removal are added with cement, curing agent and filler with a mass concentration of 20%, 10% and 3% respectively. The compressive strength of fired bricks reaches 15MPa / cm, th...

Embodiment 2

[0041] Utilize the method of the present invention to process the drilling waste of certain oil field E block, concrete steps are as follows:

[0042] (1) The drilling waste is sent to the shale shaker for primary purification, and the cuttings and sand that are larger than the diameter of the sieve hole in the drilling waste and partially smaller than the diameter of the sieve hole are solidified and removed by mechanical vibration.

[0043] Among them, the mud shaker is composed of a mud feed box, a screen box, a screen, a vibrator and a shock absorber. The mud feed box adopts a box type, and the screen is a fully bonded ditch edge rigid screen. 1.0~2.0mm; the adjustable range of screen box inclination is +1°~+3°.

[0044] The cuttings and sand obtained by solidifying and removing are added cement, curing agent and filler with a mass concentration of 10%, 8% and 2% respectively. The compressive strength of fired bricks reaches 18MPa / cm, the flexural strength reaches 3.2MPa,...

Embodiment 3

[0057] Utilize the method of the present invention to process the drilling waste of certain oilfield P block, concrete steps are as follows:

[0058] (2) The drilling waste is sent to the shale shaker for primary purification, and the cuttings and sand that are larger than the diameter of the sieve hole in the drilling waste are solidified and removed by adsorption through mechanical vibration.

[0059] Among them, the mud shaker is composed of a mud feed box, a screen box, a screen, a vibrator and a shock absorber. The mud feed box adopts a weir type, and the screen is a fully bonded ditch edge rigid screen. The size of the screen is 2.0~4.0mm; the adjustable range of screen box inclination is -1°~+6°.

[0060] The cuttings and sand obtained by solidification and removal are added with cement, curing agent and filler with a mass concentration of 15%, 5% and 1% respectively. The compressive strength of fired bricks reaches 16MPa / cm, the flexural strength reaches 2.8MPa, the w...

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Abstract

The invention belongs to the technical field of sewage processing, and concretely relates to a drilling wastes recycling method. The method comprises the following steps: performing primary purifying, removing rock debris and sandstones; performing destabilizing and flocculating treatment, conglomerating the suspending granules into a flocculent body; performing solid-liquid separating, using a separated sludge for profile control of a water injection well in an oil field; performing biological treatment on the separated sewage to reduce COD, carrying out microfiltration and ultrafiltration processing for removing a suspension and a colloid as well as reducing SDI, performing reverse osmosis to obtain fresh water for reuse, evaporating concentrated water obtained by reverse osmosis and crystallization, reusing the fresh water obtained by evaporation, and reusing the common salt and potassium chloride obtained by crystallization as an additive of a drilling fluid. The method realizes harmlessness and recycling of the drilling wastes, eliminates pollution on surrounding environment, and is in favor of protection of resources such as soil, air and underground water at periphery of a well field. The method can be widely used in a recycling treatment process of the drilling wastes in the oil field.

Description

technical field [0001] The invention relates to a treatment method for oilfield drilling waste, in particular to a resource utilization method for oilfield drilling waste. technical background [0002] With the development of the oil industry, the pollution caused by drilling has attracted more and more attention. my country's oilfields produce about 900,000 cubic meters of drilling waste per year only from well drilling (excluding natural gas and coalbed methane), of which one-third is discharged into the environment. Drilling waste is mainly waste drilling fluid and waste water, with complex components, mainly including drilling cuttings, clay particles, weighting materials, inorganic salts, and various chemical additives (commonly used are clay stabilizers, corrosives, preservatives, fungicides, Lubricant, formation affinity agent, defoamer and other hundreds of products in 16 categories) and petroleum and other pollutants, the "National Hazardous Waste List" has clearly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
CPCC02F1/004C02F1/04C02F1/28C02F1/441C02F1/52C02F1/5236C02F1/5245C02F1/56C02F3/00C02F3/341C02F3/348C02F9/00C02F2103/10C02F2301/08C02F2305/04
Inventor 潘永强袁长忠徐鹏徐闯冯云谭晓明巴燕吴晓玲刘涛段传慧张守献
Owner CHINA PETROLEUM & CHEM CORP
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