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Physical foam cementing method

A foamed cement and cementing technology, which is applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of poor cement stone structure homogeneity, low input and output ratio, and chemical foaming method cost. High-level problems, to achieve the effect of high input-output ratio, good environmental performance, and excellent lightweight characteristics

Active Publication Date: 2012-05-23
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a chemical foaming method is affected by the uniformity of additive mixing, temperature, and pressure, and the volume of the foam produced is different, so the cement stone structure formed has poor homogeneity and low compressive strength. At the same time, the cost of the chemical foaming method is relatively high. High, low ratio of input to output, poor economic benefits

Method used

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Effect test

Embodiment 1

[0024] Refer to the attached figure 1 , the method discloses a physical foam cement well cementing method, after diluting the stock solution of the foaming agent and clear water according to the weight mixing ratio of 1:10-30, stirring evenly, and then supplying 0.2-0.6 Compressed air at MPa pressure; according to different cement density requirements, set the pumping speed of the metering pump, and provide the diluted foaming agent stock solution and compressed air to the foam generator at the same time within 20-45 minutes to make the foaming agent stock solution and compressed air to form foam medium in the foam generator, driven by compressed air, the foam medium is input to the upper water end of the cement pump and enters the cement pump, and is mixed with cement slurry at a weight ratio of 1:10-30 to form cementing foam cement , and finally pumped into the well.

Embodiment 2

[0026] On the basis of Example 1, the foaming agent stoste and compressed air form the primary foam before the foam medium in the foam generator, and then are extruded and sheared into (processed 3 / 4" poly foam) Ethylene plastic pipe, 10-15 meters long, hovering on the roller, the primary foam foam is extruded and sheared into foam with a relatively uniform diameter when moving through the plastic pipe, and the foam diameter is 0.2-1mm) foam medium that meets the construction requirements. The uniform stirring is to put the foaming agent stock solution and clear water in the preparation box and stir evenly.

Embodiment 3

[0028] On the basis of Embodiment 1 or 2, the foaming agent stock solution can adopt the foaming agent stock solution in the disclosed patent documents of Xi'an University of Technology, or can adopt the general foaming agent stock solution on the market, the foaming agent stock solution For organic protein materials, for example, a foaming agent stock solution of model FPL-1 can be used, which is a brown liquid. The diameter of the foam medium is 0.2-1mm, the volume mixing ratio of the foam medium and cement slurry is 1:20-64, and the density of the formed cement foam cement is 1.15-1.60g / cm 3 .

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Abstract

The invention discloses a cementing method with physical foamed cement, which comprises the steps: the stock solution of a foaming agent and clear water are diluted according to the weight proportion of 1: 10 to 30, stirred evenly, and provided with compressed air with the pressure of 0.2 to 0.6MPa through an air compressor; the pumping rate of a metering pump is set, diluted stock solution of the foaming agent and the compressed air are simultaneously provided for a foam generator in unit time of 20 to 45min so as to cause the stock solution of the foaming agent and the compressed air to form foamed media in the foam generator, the foamed media is input into a cement pump by the driving of the compressed air, and mixed with cement slurry according to the weight proportion of 1: 10 to 30,and finally pumped into a well. The invention changes the technique for preparing cement by the existing chemical foaming method, the foaming process changes into ground foaming from the original well foaming, thus leading the foaming media and the cement mud to be more evenly, the slurry to be stable and the density to be small; and the cementing method is easy to adjust, control and detect.

Description

technical field [0001] The invention relates to the technical field of a physical foam cement well cementing method suitable for oil and gas exploration and development. Background technique [0002] At present, in the process of oil and gas exploration and development, the foam cement cementing method is mainly based on chemical foam cement slurry, and its construction technology is relatively simple. Generally, one cement truck injects foam liquid, and another cement truck injects additional cement. The original cement slurry with foaming agent, the foam liquid and the original cement slurry enter the distribution manifold to mix and replace the injection well at the same time, chemical changes occur downhole, and foam cement slurry is formed after generating air bubbles. Such a chemical foaming method is affected by the uniformity of additive mixing, temperature, and pressure, and the volume of the foam produced varies, so the cement stone structure formed has poor homoge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13C09K8/575
Inventor 慕建军贾芝王大权窦虎清周兴春李宏峰王瑞玲陈全发武美平赵友权雷斌发李森宜涌涛
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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