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Ultrahigh-strength tough cement paste system for well cementation as well as preparation and application thereof

An ultra-high-strength, cement slurry technology, applied in the field of deep shale gas and high-temperature deep-well cementing slurry, can solve the problems of difficulty in applying high-temperature deep-well cementing, reducing the elastic modulus of cement stone, and poor temperature resistance of rubber particles. To achieve the effect of adjustable thickening time, avoiding strength decline and prolonging service life

Active Publication Date: 2021-06-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Description
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Problems solved by technology

For example, Chinese patent CN 106833567A discloses a high-strength, high-toughness, high-temperature-resistant cementing slurry system and its preparation method, which realizes high strength through the gradation of coarse quartz sand, fine quartz sand and nano-silica particles. The compressive strength is as high as 68MPa; however, the cement slurry system does not involve toughening materials, and the elastic modulus of cement stone is only reduced by the filling of nano-silica, and there is still a lot of room for improvement
Chinese patent CN 107777965A discloses a method for preparing high-strength and high-density cement slurry. This technology uses nano-barite to absorb the microporous structure of expanded vermiculite to form a dense polymer mortar composite. The cement strength is as high as 55MPa. However, this The technology only discloses data at 120°C, and does not involve higher temperature conditions
Chinese patent CN108439872A discloses a high-strength, low-elastic-modulus, high-density cement slurry that is resistant to high temperatures. It uses high-temperature reinforcing materials and hybrid nano-reinforced tougheners. The compressive strength of cement stone is as high as 57MPa, and the elastic modulus is less than 7GPa. The disclosed hybrid nano-reinforced toughening agent requires ultrasonic treatment for 30-50 minutes, which is not convenient for field cementing application
Chinese patent CN109761547A discloses a cementing slurry system suitable for large-scale staged fracturing of shale gas horizontal wells. This technology modifies the surface of rubber particles to enhance hydrophilicity. The elastic modulus of cement stone is less than 6GPa. However, The temperature resistance of rubber particles is poor, so it is difficult to apply high temperature deep well cementing
[0004] Although the existing technologies represented by the above patents have made breakthroughs in the cement slurry system, cement stone compressive strength, toughness modification, etc., there are still some problems in cementing operations under high-temperature conditions such as deep shale gas and high-temperature deep wells. question

Method used

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  • Ultrahigh-strength tough cement paste system for well cementation as well as preparation and application thereof
  • Ultrahigh-strength tough cement paste system for well cementation as well as preparation and application thereof
  • Ultrahigh-strength tough cement paste system for well cementation as well as preparation and application thereof

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Effect test

Embodiment 1

[0052] This embodiment provides an ultra-high-strength ductile cement slurry system for well cementing, wherein the raw material composition of the ultra-high-strength ductile cement slurry system for well cementing includes:

[0053] 100 parts by weight of G-grade oil well cement, 20 parts by weight of high-temperature reinforcing materials, 0.5 parts by weight of inorganic toughening materials, 0.5 parts by weight of suspension stabilizers, 2 parts by weight of micro silicon, 0.5 parts by weight of dispersants, 3 parts by weight The fluid loss reducing agent of 1.5 parts by weight, the retarder of 1.5 parts by weight, the defoamer of 0.3 parts by weight, the clear water of 47 parts by weight.

[0054] In this embodiment, the high-temperature reinforcing material is a combination of ultrafine silica fume and ultrafine cement, and the mass ratio of the two is 1:1, wherein the particle size of the ultrafine cement is not greater than 5 microns, and the superfine silica fume The...

Embodiment 2

[0067] This embodiment provides an ultra-high-strength ductile cement slurry system for well cementing, wherein the raw material composition of the ultra-high-strength ductile cement slurry system for well cementing includes:

[0068] 100 parts by weight of G-grade oil well cement, 35 parts by weight of high-temperature reinforcing materials, 1 part by weight of inorganic toughening materials, 1 part by weight of suspension stabilizers, 3 parts by weight of micro silicon, 0.8 parts by weight of dispersants, 3.5 parts by weight The water loss reducing agent of 3 parts by weight, the retarder of 3 parts by weight, the defoamer of 0.3 parts by weight, the clear water of 48.5 parts by weight.

[0069] In this embodiment, the high-temperature reinforcing material is quartz sand with a particle size not greater than 20 microns and a purity not lower than 96%.

[0070] The inorganic toughening material is a combination of brucite fibers and calcium carbonate whiskers, and the mass ra...

Embodiment 3

[0082] This embodiment provides an ultra-high-strength ductile cement slurry system for well cementing, wherein the raw material composition of the ultra-high-strength ductile cement slurry system for well cementing includes:

[0083] 100 parts by weight of G-grade oil well cement, 40 parts by weight of high-temperature reinforcing materials, 2 parts by weight of inorganic toughening materials, 1.5 parts by weight of suspension stabilizers, 4 parts by weight of micro silicon, 1.0 parts by weight of dispersants, 4.5 parts by weight The water loss reducing agent of 5 parts by weight, the retarder of 5 parts by weight, the defoamer of 0.3 parts by weight, the clear water of 52 parts by weight.

[0084] In this embodiment, the high-temperature reinforcing material is a combination of ultrafine silicon powder and metakaolin, the mass ratio of the two is 4:1, wherein the particle size of the ultrafine silicon powder is not greater than 10 microns, and the purity is not low At 96%, t...

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Abstract

The invention provides an ultrahigh-strength tough cement slurry system for well cementation and preparation and application thereof. The ultrahigh-strength tough cement slurry system for well cementation comprises the following raw materials: 100 parts by weight of cement, 20-40 parts by weight of a high-temperature reinforcing material, 0.5-6 parts by weight of an inorganic toughening material, 0.5-4 parts by weight of a suspension stabilizer, 2-6 parts by weight of micro silicon, 0.5-1.5 parts of a dispersing agent, 2-6 parts of a fluid loss agent, 1-8 parts of a retarder, 0.2-1 part of a defoaming agent and 40-60 parts of clear water. The cement paste system is good in flowability and sedimentation stability, low in water loss, adjustable in thickening time and wide in adaptive temperature range; the set cement has the characteristics of ultrahigh strength and the like, well cementation requirements of deep shale gas, high-temperature deep wells and the like can be well met, set cement strength decline caused by high-temperature strength can be avoided, and the service lifetime of an oil-gas well can be further prolonged.

Description

technical field [0001] The invention relates to an ultra-high-strength ductile cement slurry system for well cementing and its preparation and application, and belongs to the technical field of deep shale gas and high-temperature deep well cementing slurry. Background technique [0002] With the advancement of drilling technology and the continuous deepening of oil and gas exploration and development, deep shale gas and high-temperature deep well cementing are gradually increasing. The difficulties in cementing under high-temperature conditions are mainly reflected in the following aspects: (1) The cement slurry has poor settlement stability and During construction, the solid phase is easy to settle and cause potential safety hazards; (2) The water loss of cement slurry becomes larger, even uncontrollable, and the construction risk increases; (3) The amount of retarder is large, and the thickening time is not easy to adjust; (4) ) The strength of cement stone is easy to decl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2201/20C04B2111/00724C04B2201/52C04B14/04C04B7/02C04B14/4618C04B14/383C04B14/10C04B14/062C04B24/30C04B24/166C04B2103/22C04B24/003
Inventor 丁志伟张华于永金靳建洲徐明齐奉忠曲从锋张弛刘子帅周崇峰郭玉超纪宏飞吕斌刘慧婷
Owner BC P INC CHINA NAT PETROLEUM CORP
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