Water absorption lightening material for cementing wells and application of material

A technology of water absorption and well cementing, which is applied in the field of water absorption reducing materials for well cementing. It can solve the problems of slow strength development, lower density limit, and system instability, and achieve the effects of increasing filling water, reducing density, and high strength.

Inactive Publication Date: 2019-05-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also many research institutes conducting research and on-site application of fly ash low-density cement slurry system. Although fly ash is cheap, it has good permeability resistance, sulfate corrosion ...

Method used

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  • Water absorption lightening material for cementing wells and application of material
  • Water absorption lightening material for cementing wells and application of material
  • Water absorption lightening material for cementing wells and application of material

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Experimental program
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Embodiment Construction

[0019] In order to better illustrate the excellent performance of the lightening agent of the present invention, it is compared with the cement slurry prepared by another fly ash lightening material.

[0020] (1) The performance comparison of the cement slurry prepared by the two lightening materials is shown in Table 1 and Table 2.

[0021] Table 1 1.50g / cm prepared based on KJQ-1 lightening material 3 Density Cement Slurry Formulation and Properties

[0022]

[0023] It can be seen from Table 1 that the low-density fly ash cement slurry using the lightening material KJQ-1 has low compressive strength of cement stone under medium and low temperature conditions. When other conditions are kept the same, the early strength agent DRA-1S is added. The dosage and strength did not change significantly. At the same time, if the free fluid is greater than 2ml, the stability of the cement slurry is poor, and good cementing quality cannot be guaranteed.

[0024] Table 2 The 1.50g / ...

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Abstract

The invention discloses a water absorption lightening material for cementing wells. The material comprises, in weight percent, 20-30% of fly ash with different particle diameters, 30-40% of volcanic ash with different particle diameters, 2-5% of inorganic gel, 1-4% of nano-silicon dioxide and 25-35% of sepiolite powder. The raw materials are mixed to form the material. The particle diameter ranging from 10 nanometers to 100 nanometers accounts for 1%-2%; the particle diameter ranging from 1 micrometer to 10 micrometers accounts for 10%-20%; the particle diameter ranging from 10 micrometers to50 micrometers accounts for 40%-60%; the particle diameter ranging from 50 micrometers to 150 micrometers accounts for 10%-30%. Cement paste prepared from the water absorption lightening material canform more compact cement stones, the strength of low-density cement paste can be remarkably improved, the cement paste has a certain suspension stability, and the sedimentation stability of the cementpaste is improved.

Description

technical field [0001] The invention belongs to the technical field of well cementing in petroleum drilling engineering, and in particular relates to a water-absorbing lightening material for well cementing and an application thereof. Background technique [0002] As the exploration field continues to expand to complex and deep oil and gas reservoirs, more and more special wells and difficult wells are encountered in cementing. Among them, low pressure and easy leakage are more prominent problems. It is very necessary to have a low-density cement slurry system with multiple characteristics to meet the cementing requirements of complex wells. At present, low-density cement slurry is mostly used to reduce the density of cement slurry by adding low-density materials and increasing the water-cement ratio. The most commonly used low-density materials are fly ash, bentonite, diatomaceous earth, expanded perlite, expanded vermiculite, asphalt, slag, plastic powder, walnut shell po...

Claims

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Application Information

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IPC IPC(8): C04B18/08C04B28/02C04B111/40
CPCY02W30/91
Inventor 魏继军李连江孙宝玉吕海丹马志贺李进张璞乔
Owner BC P INC CHINA NAT PETROLEUM CORP
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