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Non-floating bead low-density oil-well cement

A technology of oil well cement and low non-bleeding beads, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor slurry fluidity, low early strength, short service life, etc., and achieve thickening time Controllable, high early strength and long life effects

Active Publication Date: 2010-08-18
哈尔滨太行兴隆水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low early strength, poor slurry fluidity, poor stability and short service life of the existing non-bleached fly ash low-density cement

Method used

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  • Non-floating bead low-density oil-well cement
  • Non-floating bead low-density oil-well cement
  • Non-floating bead low-density oil-well cement

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specific Embodiment approach 1

[0012] Embodiment 1: In this embodiment, the non-floating pearl low-density oil well cement consists of 100 parts of oil well cement, 12 to 20 parts of nano wollastonite, 120 to 180 parts of fly ash, and 3 to 6 parts of early strength agent and 4 to 8 parts of cement dispersant, of which SiO in nano wollastonite 2 The mass content of ≥96%.

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the non-floating bead low-density oil well cement is composed of 100 parts of oil well cement, 14 to 18 parts of nano wollastonite, and 140 to 160 parts of pulverized coal by weight. Ash, 4-5 parts of early strength agent and 5-7 parts of cement dispersant. Others are the same as in the first embodiment.

[0014] The cement preparation method described in this embodiment is as follows: mixing each component according to the above-mentioned ratio. When mixing the cement described in this embodiment, the water consumption accounts for 60% of the total weight of the dry ash, and the resulting cement slurry has a density of 1.60±0.02g / cm 3

specific Embodiment approach 3

[0015] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the non-floating pearl low-density oil well cement is composed of 100 parts of oil well cement, 16 parts of nano wollastonite, 150 parts of fly ash, 4.5 parts by weight Early strength agent and 6 parts cement dispersant. Others are the same as the specific way one.

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Abstract

The invention relates to low-density oil-well cement, in particular to non-floating bead low-density oil-well cement. The invention solves the problems of low early strength, poor slurry flowability and stability and short service life of the traditional non-floating bead pulverized fuel ash low-density cement. The non-floating bead low-density oil-well cement comprises oil-well cement, pulverized fuel ash, an aldosterone sulfonate condensate dispersing agent, nano silicon ash stone and an early strength agent, and the mass content of SiO2 in the nano silicon ash stone is larger than or equalto 96 percent. The cement has good stability, good compactness, high early strength, long service life, good rheological property and controllable densification time and meets the requirement of a low-pressure stratum oil field cementation well on the performance of the cement.

Description

technical field [0001] The invention relates to a low-density oil well cement. Background technique [0002] With the increasing difficulty of oil and gas field development, there are more and more special wells and difficult wells encountered in cementing operations, such as low-pressure leaky wells and long-sealed wells, etc. The improvement of cementing quality is urgently to be solved. question. It is very necessary to develop a low-density cement with multiple properties to meet the cementing requirements of such complex wells. [0003] At present, for cementing wells in low-pressure leaky formations, the most commonly used is the low-density cement slurry system of floating beads, which has the advantages of low density and high compressive strength. Under normal circumstances, water will enter the hollow ball through the pores on the floating beads, which makes the liquid mixed with various chemical admixtures enter the floating beads, which will easily increase the...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/473C09K8/493
Inventor 张伟杰李玉双杨子文隋金柱
Owner 哈尔滨太行兴隆水泥有限公司
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