A kind of densifier and ultra-high density cement slurry based on the densifier

Abstract

The invention discloses a densifier and an ultra-high-density cement slurry based on the densifier. The weight composition of the densifier is: 80-90 parts of iron ore powder, 5-10 parts of manganese ore powder, and 5 parts of G-grade superfine cement. -10 parts, microsilica fume 5-10 parts. The ultra-high-density cement slurry provided by the invention has stable performance, low water loss, certain anti-air channeling ability, relatively ideal thickening transition time and can form cement stone with strong strength. It can effectively control high-pressure oil and gas layers, avoid oil and gas escape, and better improve the quality of cementing.

Description

technical field

[0001] The invention belongs to the technical field of oil testing engineering, and in particular relates to a method for preparing an ultra-high-density cement slurry system in petroleum exploration and development. Background technique

[0002] With the increasing drilling footage of deep wells and ultra-deep wells in complex formations, ordinary high-density cement slurry can no longer meet the needs of deep wells, ultra-deep wells and ultra-high pressure cementing operations. It is imperative to study ultra-high-density cement slurry systems. Therefore, the research on ultra-high-density cement slurry system is not only to meet the urgent needs of production, but also has very important practical significance.

[0003] Domestic oil fields have basically formed 2.40g / cm 3 Using ordinary high-density cement slurry technology, but higher than 2.50g / cm 3 The density of ultra-high density cement slurry technology is limited by materials and basic theory, and...

Examples

Embodiment 1

[0025] Density at 90°C is 2.50g / cm 3 The ultra-high-density cement slurry is composed of a base formula and additives: the weight of the base formula consists of 100 parts of cement, 180 parts of ilmenite, 20 parts of a densifier, and a water-cement ratio of 0.27; In terms of percentage, the weight percentage of additives is composed of: 0.6% of fluid loss reducer, 0.2% of drag reducer, and 0.05% of retarder. The weight of said densifier consists of: 80-90 parts of iron ore powder, 5 parts of manganese ore powder -10 parts, G grade superfine cement 5-10 parts, micro silica fume 5-10 parts.

Embodiment 2

[0027] Density at 120°C is 2.50g / cm 3 The ultra-high-density cement slurry is composed of a base formula and additives: the weight of the base formula is 75 parts of cement, 25 parts of quartz sand, 170 parts of ilmenite, 30 parts of densifier, and a water-cement ratio of 0.26; In terms of the percentage of the total weight of the square, the weight percentage of additives is composed of: 0.8% of high temperature fluid loss reducer, 0.4% of drag reducer, and 0.1% of retarder, and the weight of said densifier is composed of: iron ore powder 80-90% 5-10 parts of manganese ore powder, 5-10 parts of G grade superfine cement, and 5-10 parts of microsilica fume.

Embodiment 3

[0029] Density at 90°C is 2.90g / cm 3 The ultra-high-density cement slurry is composed of a base formula and additives: the weight of the base formula consists of 100 parts of cement, 125 parts of a densifier, and a water-cement ratio of 0.2; in terms of the percentage of the total weight of the base formula, the weight of the additive The percentage composition is: 0.5% fluid loss reducer, 0.7% drag reducer, 0.05% retarder, and the weight composition of the densifier is: 80-90 parts of iron ore powder, 5-10 parts of manganese ore powder, G grade 5-10 parts of superfine cement, 5-10 parts of microsilica fume.

technical field

[0001] The invention belongs to the technical field of oil testing engineering, and in particular relates to a method for preparing an ultra-high-density cement slurry system in petroleum exploration and development. Background technique

[0002] With the increasing drilling footage of deep wells and ultra-deep wells in complex formations, ordinary high-density cement slurry can no longer meet the needs of deep wells, ultra-deep wells and ultra-high pressure cementing operations. It is imperative to study ultra-high-density cement slurry systems. Therefore, the research on ultra-high-density cement slurry system is not only to meet the urgent needs of production, but also has very important practical significance.

[0003] Domestic oil fields have basically formed 2.40g / cm 3 Using ordinary high-density cement slurry technology, but higher than 2.50g / cm 3 The density of ultra-high density cement slurry technology is limited by materials and basic theory, and...

Examples

Embodiment 1

[0025] Density at 90°C is 2.50g / cm 3 The ultra-high-density cement slurry is composed of a base formula and additives: the weight of the base formula consists of 100 parts of cement, 180 parts of ilmenite, 20 parts of a densifier, and a water-cement ratio of 0.27; In terms of percentage, the weight percentage of additives is composed of: 0.6% of fluid loss reducer, 0.2% of drag reducer, and 0.05% of retarder. The weight of said densifier consists of: 80-90 parts of iron ore powder, 5 parts of manganese ore powder -10 parts, G grade superfine cement 5-10 parts, micro silica fume 5-10 parts.

Embodiment 2

[0027] Density at 120°C is 2.50g / cm 3 The ultra-high-density cement slurry is composed of a base formula and additives: the weight of the base formula is 75 parts of cement, 25 parts of quartz sand, 170 parts of ilmenite, 30 parts of densifier, and a water-cement ratio of 0.26; In terms of the percentage of the total weight of the square, the weight percentage of additives is composed of: 0.8% of high temperature fluid loss reducer, 0.4% of drag reducer, and 0.1% of retarder, and the weight of said densifier is composed of: iron ore powder 80-90% 5-10 parts of manganese ore powder, 5-10 parts of G grade superfine cement, and 5-10 parts of microsilica fume.

Embodiment 3

[0029] Density at 90°C is 2.90g / cm 3 The ultra-high-density cement slurry is composed of a base formula and additives: the weight of the base formula consists of 100 parts of cement, 125 parts of a densifier, and a water-cement ratio of 0.2; in terms of the percentage of the total weight of the base formula, the weight of the additive The percentage composition is: 0.5% fluid loss reducer, 0.7% drag reducer, 0.05% retarder, and the weight composition of the densifier is: 80-90 parts of iron ore powder, 5-10 parts of manganese ore powder, G grade 5-10 parts of superfine cement, 5-10 parts of microsilica fume.