CN-121990812-A - Low-temperature high-strength underwater non-dispersion grouting material

CN121990812ACN 121990812 ACN121990812 ACN 121990812ACN-121990812-A

Abstract

The invention provides a low-temperature high-strength underwater non-dispersion grouting material which comprises, by weight, 70-150 parts of high belite sulphoaluminate cement, 20-80 parts of magnesium phosphate cement, 240-380 parts of ordinary silicate cement, 15-50 parts of ultrafine filler, 720-1050 parts of sand, 0.1-0.3 part of mineral glue, 2.0-5.0 parts of water reducer, 2.1-0.2 part of crystal nucleus, 0.1-0.5 part of defoamer, and 100-120 parts of water. The grouting material is introduced into ultrafine filling materials and crystal nucleus, reacts with calcium aluminate in cement during hydration reaction, reduces the generation amount of metastable hydrate, produces stable hydrate to fill in slurry pores, reduces the porosity, improves the strength of a consolidated body, adopts inorganic mineral glue to reduce the viscosity of the grouting material by utilizing the shearing dilution characteristic of the inorganic mineral glue, and is assisted with a high-performance water reducing agent to reduce the water consumption, so that the problem of underwater pouring dispersion is solved on the premise of ensuring the strength of the grouting material, and the wear resistance and the sulfate corrosion resistance of the grouting material are enhanced by using magnesium phosphate cement.

Inventors

SHANG NINGNING
GUO XIAOJUN
ZHOU WEI
ZHANG AIXIA
KANG SHAOWEI
WANG LEI
DING CHAO
HAN ZHONGZHI
CUI CANCAN
LI HONGYUAN

Assignees

中国石油天然气集团有限公司
中国石油集团海洋工程有限公司
中国石油集团工程技术研究有限公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (10)

1. The low-temperature high-strength underwater non-dispersion grouting material is characterized by comprising, by weight, 70-150 parts of high belite sulphoaluminate cement, 20-80 parts of magnesium phosphate cement, 240-380 parts of ordinary silicate cement, 15-50 parts of ultrafine filler, 720-1050 parts of sand, 0.1-0.3 part of inorganic mineral glue, 2.0-5.0 parts of water reducer, 2.1-0.2 part of crystal nucleus, 0.1-0.5 part of defoamer and 100-120 parts of water.
2. The low-temperature high-strength underwater non-dispersion grouting material according to claim 1, which is characterized by comprising the following components, by weight, 110 parts of high belite sulphoaluminate cement, 50 parts of magnesium phosphate cement, 300 parts of ordinary silicate cement, 35 parts of ultrafine filler, 930 parts of sand, 0.2 part of mineral gum, 3.0 parts of water reducer, 0.2 part of crystal nucleus, 0.3 part of defoamer, and 105 parts of water.
3. The low-temperature high-strength underwater non-dispersion grouting material according to claim 1 or 2, wherein the high belite sulphoaluminate cement is 42.5 grade, the specific surface area is not less than 450m2/kg, the MgO content in the magnesium phosphate cement is not less than 60%, and the 28d compressive strength is not less than 60MPa.
4. The low-temperature high-strength underwater non-dispersive grouting material according to claim 1, wherein the ordinary portland cement is 42.5 grade.
5. The low-temperature high-strength underwater non-dispersive grouting material according to claim 1, wherein the ultra-fine filling material is at least one of microbeads, silica fume, slag powder, gypsum, limestone powder, dolomite powder and magnesia-alumina spinel powder.
6. The low-temperature high-strength underwater non-dispersion grouting material according to claim 1, wherein the sand is water-washed sand which is closely piled, the MB value is less than or equal to 1.4, the grain diameter ranges are 0.075-0.16 mm, 0.16-0.315 mm, 0.315-0.63 mm, 0.63-1.25 mm and 1.25-2.5 mm; Wherein the mass percentage of the sand in each particle size range is as follows: 20.3-26.7% of water-washed sand with the thickness of 0.075-0.16 mm; 12.8-18.1% of 0.16-0.315 mm water-washed sand; 14.2 to 19.5 percent of water-washed sand with the thickness of 0.315 to 0.63 mm; 16.6-23.1% of water-washed sand with the diameter of 0.63-1.25 mm; 21.7-28.9% of 1.25-2.5 mm water washed sand.
7. The low-temperature high-strength underwater non-dispersive grouting material according to claim 1, wherein the inorganic mineral gum is magnesium aluminosilicate.
8. The low-temperature high-strength underwater non-dispersive grouting material according to claim 1, wherein the water reducing agent is a polycarboxylate water reducing agent, and the water reducing rate is more than or equal to 26%.
9. The low-temperature high-strength underwater non-dispersive grouting material according to claim 1, wherein the crystal nucleus is calcium silicate hydrate crystal nucleus.
10. The low-temperature high-strength underwater non-dispersive grouting material according to claim 1, wherein the defoaming agent is an organosilicon defoaming agent.

Description

Low-temperature high-strength underwater non-dispersion grouting material Technical Field The invention relates to the technical field of grouting under low-temperature conditions in petroleum exploration, in particular to a low-temperature high-strength underwater non-dispersion grouting material. Background In recent years, offshore wind power and petroleum exploration and development in China are rapid, and a large number of offshore grouting operations exist. The water temperature of the surface layer of the Bohai sea and the coastal region of the yellow sea in winter is not more than 6 ℃ and the lowest temperature is-2 ℃. When the offshore wind power and oil platforms in the Bohai sea and yellow sea areas are grouted in winter, the common grouting material is greatly influenced by the environmental temperature, the cement hydration is limited under the low-temperature condition, the strength development is slow, and the construction progress and the engineering quality are seriously influenced. The common low-temperature grouting material has the advantages that the early strength of the grouting material is developed quickly due to the use of early strength cements such as high-alumina cement, sulphoaluminate cement and the like, the pore in the slurry is increased, the 28d strength is difficult to exceed 80MPa, the risk of strength collapse exists, the grouting requirement of ocean engineering, particularly offshore wind power engineering, is difficult to meet, and therefore, the development of the high-strength grouting material capable of being used in a low-temperature environment is of great significance to offshore wind power and petroleum exploration and development. The patent CN202211688629.0 discloses a low-temperature sleeve grouting material for steel bar connection and a preparation method thereof, wherein the low-temperature grouting material is prepared from, by mass, 800-1000 parts of cement, 10-50 parts of modified silica fume, 10-100 parts of gypsum, 900-1100 parts of fine aggregate, 0.1-0.5 part of early strength agent, 1-3 parts of retarder, 2-5 parts of water reducer, 0.2-0.6 part of retarder, 0.1-0.5 part of swelling agent, 1-5 parts of antifreeze, 1-5 parts of phase change material and 0.11-0.15 part of water. The patent CN201810951617.X discloses a high and low temperature resistant sleeve grouting material and a preparation method thereof, wherein the grouting material mainly comprises 40-65 parts by mass of cement, 20-40 parts by mass of aggregate, 2-10 parts by mass of gypsum, 0.3-1.0 parts by mass of polycarboxylate water reducer, 0.05-0.3 parts by mass of accelerator and 0.05-0.3 parts by mass of retarder. In the above-mentioned publication, because of using a large amount of high alumina cement, sulphoaluminate cement, early strength agent, coagulant, make grouting material early strength develop fast, concretion body internal pore increases, its 28d intensity is not more than 100MPa, can't be suitable for the high-strength grouting engineering, especially marine wind power grouting engineering. Disclosure of Invention The invention provides a low-temperature high-strength underwater non-dispersion grouting material which comprises, by weight, 70-150 parts of high belite sulphoaluminate cement, 20-80 parts of magnesium phosphate cement, 240-380 parts of ordinary silicate cement, 15-50 parts of ultrafine filler, 720-1050 parts of sand, 0.1-0.3 part of mineral glue, 2.0-5.0 parts of a water reducing agent, 0.1-0.2 part of crystal nucleus, 0.1-0.5 part of a defoaming agent, and 100-120 parts of water. Preferably, the low-temperature high-strength underwater non-dispersion grouting material comprises, by weight, 110 parts of high belite sulphoaluminate cement, 50 parts of magnesium phosphate cement, 300 parts of ordinary silicate cement, 35 parts of ultrafine filler, 930 parts of sand, 0.2 part of mineral gum, 3.0 parts of water reducer, 0.2 part of crystal nucleus, 0.3 part of defoaming agent, and 105 parts of water. Specifically, the wear and sulfate corrosion resistance of the grouting material is enhanced by using magnesium phosphate cement Further, the high belite sulphoaluminate cement is 42.5 grade, the specific surface area is more than or equal to 450m < 2 >/kg, the MgO content in the magnesium phosphate cement is more than or equal to 60%, and the 28d compressive strength is more than or equal to 60MPa. Further, the ordinary portland cement is 42.5 grade. Further, the superfine filler is at least one of microbeads, silica fume, slag powder, gypsum, limestone powder, dolomite powder and magnesia-alumina spinel powder. Further, the sand is water-washed sand which is closely piled, the MB value is less than or equal to 1.4, the grain diameter range is 0.075-0.16 mm, 0.16-0.315 mm, 0.315-0.63 mm, 0.63-1.25 mm and 1.25-2.5 mm; Wherein the mass percentage of the sand in each particle size range is as follows: 20.3-26.7% of water-washed sand with the thickness of 0.075-0.1