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Treatment method of wax-emulsion drilling fluid

A technology of paraffin emulsion and treatment method, which is applied in earthwork drilling, wellbore flushing, wellbore/well parts, etc. It can solve the problem of large amount of defoaming agent, fluid loss reducing agent and flow pattern regulator, which affects the drilling fluid pump. Stable water application, reducing the difficulty of API water loss, etc., to achieve the effects of short immersion time in the oil layer, easy control of API water loss, and easy adjustment of sticking and shearing

Inactive Publication Date: 2012-08-29
中石化石油工程技术服务有限公司
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AI Technical Summary

Problems solved by technology

[0006] Disadvantages of the current application process of paraffin emulsion: without adjusting the performance of drilling fluid, directly mixed with paraffin emulsion, the drilling fluid foams seriously, affecting the smooth water supply of the drilling fluid pump and the pulse signal transmission of downhole instruments; it is difficult to reduce API water loss; rheological properties Unstable, repeated fluctuations, difficult to adjust sticky cutting
The amount of defoaming agent, fluid loss reducing agent and flow regulator is large, the cost is high, and the operating procedures are many and the workload is large.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0019] 1. Construction preparation: Before drilling to the build-up point, adjust the performance of the drilling fluid. The density meets the formation pressure and wellbore safety requirements. YP is 3 ~ 7Pa, the impact of cement invasion must be removed, and other properties do not need special adjustment.

[0020] 2. Mixing adjustment: During the construction of the deflection section, the paraffin emulsion is mixed into the drilling fluid. In order to avoid fluctuations in the rheological properties of the drilling fluid, it is more appropriate to control the mixing speed at no more than 200kg per cycle, and the content of the drilling fluid should reach 1.5%. Finally, depending on the change of the downhole drilling tool lifting friction and the torque of the rotary table, supplement according to the cycle cycle, so that the paraffin emulsion content in the horizontal section is 2±0.5%.

[0021] 3. Performance maintenance: After the lubrication performance of the drillin...

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Abstract

The invention discloses a treatment method of wax-emulsion drilling fluid, which comprises the steps of mixing regulation, performance maintenance, oil layer protection and advance preparation. The treatment method can be used for conveniently treating the wax-emulsion drilling fluid without substantial fluctuations of the performance of the drilling-fluid so as to simplify the treatment method and the maintenance procedure, enhance the lubricating and antiseizing effects, being favorable to the environmental protection, reduce the labor intensity and realize the goals of energy saving and environmental protection.

Description

technical field [0001] The invention relates to an on-site treatment method of drilling fluid. Background technique [0002] During oil drilling construction, mudstone formations are prone to collapse, causing downhole complexity and affecting drilling efficiency. [0003] Paraffin wax emulsion is mainly used as a lubricant for drilling fluids. The droplets are not easily deformed, have good fluidity, can be easily dispersed in water and can be highly diluted, and have little effect on the rheological properties of drilling fluids. The fluorescence level and biological toxicity are extremely low, which meets the requirements of Requirements for geological logging and environmental friendliness; an oil film can be formed on the surface of the drill string and the well wall to produce better lubrication; a shielding zone can be formed near the wellbore to prevent the deep intrusion of the solid-liquid phase, and at the same time, the paraffin is easy to reverse and the storage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/06
Inventor 王学军张宗林陈军
Owner 中石化石油工程技术服务有限公司
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