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Anti-salt high-density cement mortar

A high-density, cement slurry technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of cement slurry performance deterioration, cement slurry pollution, cement slurry thickening, etc., to improve flow performance and comprehensive performance , a wide range of effects

Inactive Publication Date: 2009-01-07
CNPC RES INST OF ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When drilling into a salt layer, the cement slurry is easily polluted by the salt layer, resulting in deterioration of the performance of the cement slurry. A salt-resistant slurry system is required. The current high-density cement slurry has problems such as thick slurry, low strength, and no salt resistance.

Method used

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  • Anti-salt high-density cement mortar

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Embodiment Construction

[0029] Grout recipe:

[0030] 1. Density 2.2g / cm 3

[0031] Dry mix material (100% cement + 78% weighting agent A + 13% weighting agent B + 1.5% drag reducer) + liquid mix material (5% fluid loss reducer + 60% water + 0.4% retarder + 0.2% Defoamer+9%NaCl)

[0032] 2. Density 2.4g / cm 3

[0033] Dry mix material (100% cement + 35% silica fume + 100% weighting agent A + 30% weighting agent B + 2.5% drag reducer) + liquid mix material (4.5% fluid loss reducer + 59% water + 1.3% retarder Coagulant + 0.2% defoamer)

[0034] 3. Density 2.6g / cm 3

[0035] Dry mix material (100% cement + 130% weighting agent A + 30% weighting agent B + 3% drag reducer) + liquid mix material (4% fluid loss reducer + 51% water + 0.5% retarder + 0.2% defoamer)

[0036] 4. Density 2.8g / cm 3

[0037] Dry mix material (100% cement + 240% weighting agent A + 30% weighting agent B + 3.5% drag reducer) + liquid mix material (4% fluid loss reducer + 65% water + 1.2% retarder + 0.2% defoamer)

[0038...

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Abstract

The invention relates to a cement slurry system used for solidifying a well in a petroleum drilling engineering: 50-300 percent of well cement aggravating agent A, 10-100 percent of well cement aggravating agent B, 0.5-4 percent of drag reducing agent, 2.5-8 percent of fluid loss additive, 0.1-5 percent of retarder and 0.15-1.2 percent of defoaming agent. The mixture of wet mixed additive occupies 50-100 percent of the cement quality. According to a salt layer, NaCl can be added during the solidifying of the well. 30-40 percent of high temperature resisting declining agent is added at high temperature. The cement slurry, the density of which reaches to 2.8g / cm3, can be prepared.

Description

technical field [0001] The invention relates to a cement slurry system used in well cementing and cementing technology in the field of petroleum drilling engineering, which is used for cementing wells in high-pressure formations, especially high-pressure salt formations. Background technique [0002] In oil exploration and development, when drilling high-pressure formations, it is necessary to increase the density of cement slurry and carry out balanced pressure cementing to prevent overflow or channeling during cementing. When drilling into a salt layer, the cement slurry is easily polluted by the salt layer, resulting in deterioration of the performance of the cement slurry. A salt-resistant slurry system is required. The current high-density cement slurry has problems such as thick slurry, low strength, and no salt resistance. Contents of the invention [0003] The technical problem to be solved in the present invention: avoid above-mentioned weak point in the prior art...

Claims

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Application Information

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IPC IPC(8): C09K8/46
Inventor 谭文礼席方柱王翀邹建龙吴达华
Owner CNPC RES INST OF ENG TECH
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