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A kind of elastic-plastic well cementing cement slurry and preparation method thereof

A cementing slurry, elastic-plastic technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high price and wide use, low surface activity, poor temperature resistance, etc. The effect of improving permeability and mechanical properties

Active Publication Date: 2019-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used elastic and tough materials include fibers, latex, rubber particles and organic resins, but latex and organic resins limit their wide use due to their high price. Rubber particles and resin materials are poor in temperature resistance, Defects such as low density and low surface activity limit the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0055] 1. Preparation of plasticizer

[0056] Preparation of Plasticizer A:

[0057] Add 110 parts by weight of fly ash microbeads (particle size range 0.005-0.05mm, average particle diameter 0.012mm, produced by Shandong Dezhou Power Plant) into an aqueous solution containing sodium hexadecylbenzenesulfonate at a weight concentration of 0.5% to obtain powder Coal ash microbead suspension, wherein the weight percentage concentration of fly ash microbead is 50%; After mixing with the natural rubber latex (Dezhou Continental Shelf Company production) of solid phase content 1 weight part afterwards, pump into spray drier (LGZ- A, prepared by Wuxi Dongsheng Spray Granulation Drying Machinery Factory). The flow direction of the fluid in the whole process is that the air enters from the spray dryer inlet, is heated to 160°C by the heating furnace, and contacts with the fly ash microbead suspension and natural rubber latex mixture flowing in the same direction in a co-current mann...

Embodiment 1

[0062] Weigh 100 parts of cement, 30 parts of high-temperature stabilizer (microsilica fume), 5 parts of fluid loss reducer (DZJ-Y), 1.2 parts of dispersant (DZS, Sinopec Petroleum Engineering Technology Research Institute), 1.5 parts of retarder ( Sinopec Petroleum Engineering Technology Research Institute, DZH-2), 38 parts of water, 0.2 parts of defoamer (DZX, Sinopec Petroleum Engineering Technology Research Institute), 8 parts of plasticizer A, nanofiller (Misi, Sinopec Petroleum Engineering Technology Research Institute) Research Institute) 5 copies;

[0063] The preparation method of the elastic-plastic well cementing slurry:

[0064] (1) Mix cement, high-temperature stabilizer (microsilica fume), and plasticizer evenly;

[0065] (2) Add water to the constant speed stirring slurry cup, add dispersant, retarder, fluid loss reducer, defoamer, nanofiller and stir evenly, the stirring speed is 2500 rpm, and stir after adding each component Time 40s;

[0066] (3) Pour the ...

Embodiment 2

[0070] Weigh 100 parts of cement (Jiahua G grade), 30 parts of high temperature stabilizer (micro silica fume), 5 parts of fluid loss reducer (DZJ-Y), 38 parts of water, 0.2 parts of defoamer, 1.2 parts of dispersant, 1.5 parts of retarder, 3 parts of plasticizer A, 5 parts of nanofiller;

[0071] The preparation method of the elastoplastic cement slurry is the same as in Example 1.

[0072] The prepared cement slurry has a density of 1.90g / cm 3 , 80°C and 20MPa environment for 72 hours, measured elastic modulus 8.6GPa, Poisson's ratio 0.18, permeability 0.08mD, compressive strength 28MPa, tensile strength 4.5MPa.

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Abstract

The invention relates to an elasto-plastic well cementing cement slurry and a preparation method thereof, which belongs to the field of gas well cementing. The elasto-plastic well cementing cement slurry comprises the following components in parts by weight: 100 parts of cement, 0-40 parts of a high-temperature stabilizing agent, 0-200 parts of a density adjuster, 4-10 parts of a filtrate loss reducer, 0-3 parts of a dispersing agent, 0-2.5 parts of a retarder, 35-110 parts of water, 0.2-0.5 part of a defoaming agent, 3-12 parts of a plasticizer, and 5-8 parts of a nano filler. The elasto-plastic well cementing cement slurry can improve the bending resisting strength and the impact resisting strength of the cement stone and reduce the elastic modulus of the cement stone. Under high temperature and high pressure, the brittle deformation of the elasto-plastic well cementing cement slurry is converted into the plastic deformation, thus the later exploitation is guaranteed, and the service life of the oil-gas well is prolonged.

Description

technical field [0001] The invention relates to a cement slurry in the field of well cementing, and more particularly relates to an elastoplastic well cementing cement slurry and a preparation method thereof. Background technique [0002] In order to stabilize and increase production, various oilfields have successively carried out production increase measures such as water injection, fracturing, and acidification. Different operating processes will inevitably cause changes in the stress state of the downhole casing and cement sheath. The use of conventional cement slurry systems will easily lead to damage to the cement sheath. The ring loses its sealing ability, affecting later production. At the same time, in the later production process, due to changes in temperature and pressure, the stress state of the cement sheath changes, resulting in damage to the cement sheath, resulting in the generation and further expansion of cement sheath cracks, resulting in channeling betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/487C04B28/02
CPCC04B28/02C04B2103/22C04B2103/408C04B2103/50C09K8/487C04B24/42
Inventor 陶谦周仕明刘伟刘建
Owner CHINA PETROLEUM & CHEM CORP
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