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Nano composite toughened oil well cement and preparation method and application thereof

An oil well cement and nano-composite technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of small water loss, high ultimate compressive strength, low elastic modulus, etc. Small amount of water, improved deformability and good stability

Active Publication Date: 2019-06-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the object of the present invention is to provide a nanocomposite toughened oil well cement and its preparation method and application, which uses electrostatic self-assembled carbon nanotubes / nano carbon black for toughening and strengthening modification of oil well cement, which can Solve the dispersion problem of conventional nano-toughening materials in oil well cement, overcome the weak area produced by organic latex toughening materials in hardened cement stone, solve the problem of agglomeration of traditional fiber toughening materials, and use traditional technology to prepare oil well cement The slurry has good stability, no settlement phenomenon, good rheology, adjustable thickening time, small water loss, low elastic modulus, high ultimate compressive strength, and can solve the problem of oil well cement sheath under unconventional complex load environment. Cracking problem, ensuring the long-term sealing integrity of cementing, prolonging the life of oil and gas wells, and improving recovery

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  • Nano composite toughened oil well cement and preparation method and application thereof
  • Nano composite toughened oil well cement and preparation method and application thereof
  • Nano composite toughened oil well cement and preparation method and application thereof

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Embodiment 1

[0028] The present invention uses self-assembled carbon nanotubes / nanocarbon black to toughen and strengthen oil well cement, which can overcome the problem of agglomeration of ordinary nanomaterials in cement, and can also reduce the oil well cement while ensuring that the oil well cement meets the requirements of cementing operations. Its elastic modulus increases its ultimate compressive strength, which can improve the ability of oil well cement sheath to resist cracking under unconventional and complex environmental conditions, and improve the safety and efficiency of oil and gas exploitation.

[0029] In the nanocomposite toughened oil well cement in this embodiment, the raw materials include the following substances in parts by weight:

[0030] 100 parts of cement, 1 part of self-assembled carbon nanotubes / nanometer carbon black, 0.2 parts of dispersant, 0.3 parts of retarder, 0-part of fluid loss reducer, 0.1 part of defoamer and 44 parts of water.

[0031] The self-assem...

Embodiment 2

[0035] In the nanocomposite toughened oil well cement in this embodiment, the raw materials include the following substances in parts by weight:

[0036] 100 parts of cement, 3 parts of self-assembled carbon nanotubes / nanocarbon black, 0.7 parts of dispersant, 0.3 parts of retarder, 0 part of fluid loss reducer, 0.1 part of defoamer and 44 parts of water;

[0037] The self-assembled carbon nanotubes / nanocarbon blacks are prepared by an electrostatic self-assembly process, presenting a grape cluster structure, wherein the weight ratio of carbon nanotubes to nanocarbon blacks is 40:60, and the specific surface area is 65-75m 2 / g, the density is 2.0g / cm 3 , the outer diameter of carbon nanotubes is greater than 50nm, the length of carbon nanotubes is 10-20μm, and the specific surface area of ​​carbon nanotubes is greater than 40m 2 / g, the particle diameter of nano-carbon black is 23nm, and the specific surface area of ​​nano-carbon black is 23m 2 / g.

[0038] Mixing process:...

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Abstract

The invention discloses nano composite toughened oil well cement and a preparation method and application thereof. The nano composite toughened oil well cement is characterized by being prepared from,by weight, 100 parts of cement, 0.5-5 parts of self-assembled carbon nanotube / nano carbon black, 0.1-1.0 part of a dispersing agent, 0.2-0.9 part of a retarder, 0-2 parts of a fluid loss agent, 0-0.5part of an antifoaming agent and 40-60 parts of water. The self-assembled carbon nanotube / nano carbon black is prepared from an electrostatic self-assembly process and is in a grape bunch structure.Under low doping of self-assembled carbon nanotube / nano carbon black, oil well cement slurry which is high in stability, free of sedimentation, high in rheological property, adjustable in thickening time and low in water loss can be prepared according to a traditional process, hardened oil well set cement has excellent characteristics including low elasticity modulus and high ultimate compressivestrength, the problem that an oil well cement sheath is prone to cracking in a unconventional complex load environment can be solved, long-term cementing integrality in well cementation is guaranteed,the service life of an oil-gas well is prolonged, and the recovery ratio is increased.

Description

technical field [0001] The invention relates to a nanocomposite toughened oil well cement and its preparation method and application, belonging to the fields of low brittleness, high toughness and high strength oil well cement material preparation and oil and gas exploration and development. Background technique [0002] Oil well cement stones need to withstand complex environmental conditions such as temperature, pressure, drilling, injection and production, etc., which are prone to cracks and annulus, destroying the integrity of cement stones, and seriously affecting the productivity, production life and safety of oil and gas wells. In the harsh unconventional oil and gas extraction environment, the cement should have higher strength and lower elastic modulus, which will help ensure that it can resist various complex environmental loads without damage during its life cycle. The oil well cement toughening materials used in existing research mainly include fiber materials, o...

Claims

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Application Information

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IPC IPC(8): C09K8/467E21B33/13
Inventor 韩宝国董素芬李妍欧进萍
Owner DALIAN UNIV OF TECH
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