High-density potassium salt-resistant cementing slurry and preparation method for same

A cementing cement slurry and high-density technology, applied in the field of material engineering, can solve the problems of expensive weighting agent, poor fluidity of cement slurry, and low compressive strength, and achieve good fluidity, difficulty in delamination, and stability of the slurry Good results

Active Publication Date: 2013-12-18
中石化江汉石油工程有限公司钻井一公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are several difficulties in the current high-density cement slurry, mainly the poor fluidity of the cement slurry, low compressive strength, expensive individual weighting agents (such as Micromax), and the ultra-

Method used

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  • High-density potassium salt-resistant cementing slurry and preparation method for same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The mass percentage composition of potassium salt-resistant high-density cement slurry: Jiahua G-grade cement 58%, weighting agent 12%, active micro-nano silicon 3.5%, 80 mesh quartz sand 20%, salt-resistant dispersant 2%, salt-resistant dehydration Agent 4%, anti-salt retarder 0.5%, potassium chloride half-saturated brine.

[0025] Preparation process: the solid materials in the raw materials are first mixed before mixing, and then fully mixed evenly; then the mixing water and liquid admixture ingredients are added to the mixing cup and mixed, and the speed of 4000r / min ± 200r / min is maintained to make the admixture Completely disperse in the mixing water; then, add the solid material mixture into the mixing cup, and then continue to stir at the speed of 12000r / min±500r / min for 35s to discharge.

Embodiment 2

[0027] The mass percentage composition of potassium salt-resistant high-density cement slurry: Jiahua G-grade cement 33%, weighting agent 50%, active micro-nano silicon 2%, 80-mesh quartz sand 11.6%, salt-resistant dispersant 1%, salt-resistant dehydration Agent 2%, anti-salt retarder 0.4%, potassium chloride half-saturated brine.

[0028] The preparation process refers to Example 1.

Embodiment 3

[0030] The mass percentage composition of potassium salt-resistant high-density cement slurry: Jiahua G-grade cement 29%, weighting agent 56%, active micro-nano silicon 1.8%, 80 mesh quartz sand 10%, salt-resistant dispersant 1%, salt-resistant dehydration Agent 1.8%, anti-salt retarder 0.4%, potassium chloride half-saturated brine.

[0031] The preparation process refers to Example 1.

[0032] The properties of high-density cement slurry for anti-1, 2, and 3 anti-potassium salts are shown in the table below:

[0033]

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Abstract

The invention provides a high-density potassium salt-resistant cementing slurry applied to high-pressure oil-gas wells and high-pressure potassium salt well cementing construction. The high-density potassium salt-resistant cementing slurry is prepared from the raw materials in percentage by mass: 29-58% of Jiahua grade-G cement, 12-56% of a weighting agent, 1.8-3.5% of active micro-nano silicon, 10-20% of 80-mesh quartz sand, 1-2% of a salt-resistant dispersing agent, 1.8-4% of a salt-resistant fluid loss agent, and 0.3-1.0% of salt-resistant retarder, wherein the weighting agent is a mixture of 250-mesh hematite and 1200-mesh hematite, the salt-resistant dispersing agent is a formaldehyde/acetone copolymer, the salt-resistant fluid loss agent is the polymer of N,N-dimethacrylamide and maleic anhydride, and the retarder is the compound of ketonic acid and organic phosphate; the density of the cementing slurry is 2.0-2.6 g/cm<3>, the fluidity of the cementing slurry is 19-21 cm, the API (American Petroleum Institute) fluid loss of the cementing slurry is not greater than 50 ml, the rheological property n of the cementing slurry is not less than 0.5, and K is not greater than 2.

Description

technical field [0001] The invention belongs to the field of material engineering, and in particular relates to a potassium salt-resistant high-density cementing cement slurry used in high-pressure oil and gas wells and high-pressure potassium salt well cementing construction. Background technique [0002] With the increasing depletion of oil and gas resources, exploration and development are faced with the trend of looking for oil in the deep part of the earth and moving into abnormally high-pressure formations. High temperature and overpressure are common characteristics of such formations. For example, the Carboniferous Maokou Formation in the Guandu structure in the Chishui area of ​​Guizhou Province has always been a gas-bearing layer of concern, but many drilling attempts in this area have failed to reach the target layer. To overcome, the pressure stability of the formation is extremely difficult, especially the lack of high-density cement slurry during well cementing...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/48C09K8/487
Inventor 袁正堂宋金初彭博陈智源罗渠华邓先进李麓向楠赵祯谢玄峰
Owner 中石化江汉石油工程有限公司钻井一公司
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