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Waste drilling fluid gel breaker system

A technology of waste drilling fluid and gel breaker, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve remarkable experimental results and small environmental changes

Inactive Publication Date: 2012-05-23
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

will not adversely affect the environment

Method used

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  • Waste drilling fluid gel breaker system
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Experimental program
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Effect test

Embodiment 1

[0014] Under normal temperature and pressure, compound calcium chloride, aluminum sulfate, ammonium stearate and ammonium dibutylnaphthalene sulfonate in proportions of 15%, 5%, 60%, and 20% by weight to form a composite breaker. Take 5kg of waste drilling fluid, add 0.5%, 1%, 2%, 3%, and 5% of compound gel breaker, and measure its zeta potential and gel breaking condition.

[0015] Table 1 Changes in zeta potential of waste drilling fluid after adding different amounts of breakers

[0016]

Embodiment 2

[0018] Under normal temperature and pressure, compound calcium chloride, aluminum sulfate, ammonium stearate and ammonium dibutyl naphthalene sulfonate in proportions of 10%, 5%, 65%, and 20% by weight to form a composite breaker. Take 5kg of waste drilling fluid, add 0.5%, 1%, 2%, 3%, and 5% of compound gel breaker, and measure its zeta potential and gel breaking condition.

[0019] Table 2 Changes in zeta potential of waste drilling fluid after adding different amounts of breakers

[0020]

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Abstract

The invention relates to a waste drilling fluid gel breaker system suitable for a low permeability oil-gas field, which comprises the following components in percentage by weight: 10 to 20 percent of calcium chloride, 5 to 10 percent of aluminum sulfate, 60 to 70 percent of ammonium base stearate and 10 to 20 percent of ammonium dibutyl naphthalene sulphonate. Due to the adoption of the composite gel breaker system, the zeta potential waste drilling fluid is reduced to within a range of 5mV, the aim of breaking a stable colloidal system of the waste drilling fluid is fulfilled, and waste drilling fluid particles are aggregated and precipitated to realize solid and fluid separation. In the composite gel breaker system, organic salt is used as the main component, so that the defect that the application of an inorganic salt gel breaker to increasing of the salt content of the waste drilling fluid is not beneficial to the environment is overcome, underground water is better protected, and the waste drilling fluid gel breaker system is more beneficial to repairing the soil of a well field.

Description

technical field [0001] The invention relates to a gel breaker system suitable for waste drilling fluid in low-permeability oil and gas fields. Background technique [0002] Drilling fluid is an essential working fluid in oil and gas development. It plays the role of carrying cuttings, balancing pressure, cooling and lubricating drilling tools, and transmitting hydrodynamic force in drilling engineering. It is mainly composed of bentonite, organic additives, and water. It is a kind of Stable colloidal system; the large-scale development of oil and gas fields will inevitably produce a large amount of waste drilling fluid, and the pollutants in it will cause certain harm to the environment. To treat waste drilling fluid, firstly, its stable colloidal suspension system must be destroyed to realize solid-liquid separation, so as to achieve the purpose of waste reduction and waste water reuse. Due to the need to protect the reservoir in low-permeability oil and gas fields, the co...

Claims

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Application Information

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IPC IPC(8): C02F1/54
Inventor 周立辉任建科冀忠伦赵敏任小荣张海玲李岩张璇杨琴
Owner PETROCHINA CO LTD
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