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Modified cellulose gel breaker for drilling fluid and preparation method thereof

A drilling fluid and cellulose technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of infiltration into the stratum, adverse environmental effects, influence on drinking water sources, soil, animal and plant growth, etc. Good effect of reducing production cost, environmental protection and social benefits

Active Publication Date: 2019-03-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The Changqing Oilfield located in the Ordos Basin drills and completes thousands of wells every year, generating nearly 500×100 drilling fluid waste 4 m 3 , are basically stacked or dried and buried at the well site, causing adverse effects on the environment, such as possibly causing infiltration into the formation, affecting drinking water sources, soil, and the growth of animals and plants

Method used

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  • Modified cellulose gel breaker for drilling fluid and preparation method thereof
  • Modified cellulose gel breaker for drilling fluid and preparation method thereof
  • Modified cellulose gel breaker for drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] In order to overcome the problem that there is nowhere to discharge the waste drilling fluid in the first drilling section, the present invention provides a modified cellulose breaker for drilling fluid and its preparation method. The breaker is non-biologically toxic, biodegradable and environmentally friendly. , the cost of raw materials used is low, the preparation method and required equipment conditions are simple, and it is easy to implement. It can not only meet the requirements of clean production for drilling fluid breakers in the large-scale drilling construction process of Changqing, but also greatly reduce production costs. At the same time, it provides technical support for the harmless treatment of drilling fluid and completion fluid, realizes "zero discharge" and "zero pollution" of drilling fluid, and has good economic, environmental and social benefits.

[0035] A modified cellulose breaker for drilling fluid, the weight percentage of the breaker is:

...

Embodiment 2

[0048] Based on Example 1, the modifier described in this example includes 20% to 30% sodium metaaluminate, 5% to 10% chloroacetic acid, 4% to 6% dodecyl di Methylamine, 3-7% bishydroxyethylamine and 4-8% acrylamide.

[0049] The initiator is ammonium persulfate.

[0050] Described pH regulator is glacial acetic acid.

[0051] In this embodiment, glacial acetic acid is used to adjust the pH, which can be quickly adjusted to the required pH at an applicable temperature.

[0052]In this embodiment, natural cellulose is used as the basic raw material; sodium metaaluminate, chloroacetic acid, dodecyldimethylamine, bishydroxyethylamine, and acrylamide are used as chemical modifiers; ammonium persulfate is used as chemical modifier. Reaction initiator; Glacial acetic acid is a pH regulator. The natural cellulose adopted is a pure natural raw material, which is beneficial to environmental protection and is cheap. Sodium metaaluminate and chloroacetic acid: the two together realiz...

Embodiment 3

[0054] On the basis of the foregoing examples, the gel breaker described in this example consists of: natural cellulose: 50%, sodium metaaluminate: 25%, chloroacetic acid: 8%, dodecyl dimethyl Base amine: 5%, bishydroxyethylamine: 4%, acrylamide: 5.5%, initiator: 0.5%, pH regulator: 2.0%. Add natural cellulose into the closed reaction kettle in strict accordance with the above ratio, start stirring, add sodium metaaluminate, and continue stirring for 0.5h with pure nitrogen gas. When the temperature of the reaction kettle reaches 50℃~60℃, add chloroacetic acid slowly and evenly , stirred and reacted for 2 hours, continued to heat up to 70°C to 90°C, added dodecyldimethylamine (completed in about 0.5h), stirred for 1 hour, continued to heat up to 100°C to 120°C, and then added bishydroxyethylamine successively amine, acrylamide, and ammonium persulfate, stirred for 2 hours, stopped heating, and added glacial acetic acid to adjust the pH value to 6-7. After cooling, dry at 130°...

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Abstract

The present invention provides a modified cellulose gel breaking agent for a drilling fluid and a preparation method thereof, and the modified cellulose gel breaking agent comprises natural cellulose, a modifying agent, an initiator and a pH regulator. The modified cellulose gel breaking agent for the drilling fluid is prepared from natural cellulose as a raw material, the modified cellulose gel breaking agent can be used for gel breaking and destabilization of a low solid polymer drilling fluid for a first opening well section of an oil-gas well of Changqing Oilfield, and solves the problem of no place for emission of the drilling fluid after implementation of no falling of the drilling fluid on the ground. The modified cellulose gel breaking agent has no biological toxicity, is biodegradable and environmentally friendly, the used raw material is low in cost, the preparation method and required equipment conditions are simple and easy to implement, the requirements of clean production on the gel breaking agent for the drilling fluid in the large scale drilling process in the Changqing Oilfield can be met, production cost can be greatly reduced, zero discharge and zero pollution of the drilling fluid can be realized, and the modified cellulose gel breaking agent has good economic benefits, environmental benefits and social benefits.

Description

technical field [0001] The invention relates to a modified cellulose breaker for drilling fluid and a preparation method thereof. Background technique [0002] The Changqing Oilfield located in the Ordos Basin drills and completes thousands of wells every year, generating nearly 500×100 drilling fluid waste 4 m 3 , are basically stacked or dried and buried at the well site, causing adverse effects on the environment, such as possibly causing infiltration into the formation, affecting drinking water sources, soil, and the growth of animals and plants. At the end of 2014, the new "Environmental Protection Law" was implemented, and then China National Petroleum Corporation issued the "Drilling Waste Fluid and Drill Cuttings Treatment Management Regulations (Provisional)", Changqing Oilfield Branch issued the "Changqing Oilfield Drilling Waste Drilling Cuttings Disposal Management Measures”, Ordos City has also issued relevant documents for the Sulige gas field drilling waste ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/26
Inventor 黎金明郝超郭康张潮张长庚张艺聪周强郑玉辉陈磊曹辉王勇强王国庆赵向阳蒋振伟俞浩杰胡恒蔺文洁
Owner BC P INC CHINA NAT PETROLEUM CORP
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