Spherical high-density micro-nano-scale acid-soluble weighting material as well as preparation method and application thereof

A weighted material and high-density technology, which is applied in the fields of petroleum exploration and rock and soil excavation, can solve problems such as stress sensitive damage, cracks that are difficult to restore to their original state, and reservoir damage, etc., and achieve low flowback pressure, easy flowback, and good suspension Effect

Pending Publication Date: 2022-05-27
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During drilling, testing, production, etc., formations with well-developed fractures are prone to fracture closure under pressure fluctuations, resulting in stress-sensitive damage. Affected by factors such as fracture fillers, drilling fluid solid phase, and liquid phase intrusion into fractures, fractures are difficult to close after closure. Reverts back to normal for long-lasting reservoir damage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Spherical high-density micro-nano-scale acid-soluble weighting material as well as preparation method and application thereof
  • Spherical high-density micro-nano-scale acid-soluble weighting material as well as preparation method and application thereof
  • Spherical high-density micro-nano-scale acid-soluble weighting material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031]According to a typical embodiment of the present invention, a method for preparing the above-mentioned spherical high-density micro-nano acid-soluble weighting material is provided. The preparation method includes the following steps: in parts by mass, mixing 30-70 parts of nano-scale manganese tetroxide, 30-65 parts of micro-scale manganese tetroxide, and 0-5 parts of dispersant to obtain spherical Density micro-nano acid-soluble weighting material.

[0032] According to a typical embodiment of the present invention, an application of the above weighting material in petroleum exploration or geotechnical excavation is provided, wherein the weighting material can reduce the high temperature and high pressure filtration loss of all oil-based fluids to less than 5ml (high temperature and high pressure filter). The loss can be measured by the national standard).

Embodiment 1

[0035] Preparation of nano-scale manganese tetroxide: take 50 parts by mass of 100 mesh black manganese ore powder and 20 parts of 10mol / L sodium hydroxide solution, after stirring evenly, pass nitrogen 0.5-0.7MPa, add 10 parts of octanol, 1 part of butanol After 3-4 hours of constant temperature stirring reaction, cooling, filtering, washing, and pyrolysis at a thermal decomposition temperature of 900 °C for 1 hour at high temperature, it can be obtained;

[0036] Preparation of micron-sized manganese tetroxide: by volume ratio, under the condition of oil bath at 98°C, 40 parts of 0.5mol / LMnSO 4 Solution, 25 parts of ammonia water, with mild stirring, pH=10 or so, stirring time is 0.5h. Continue to add 10 parts of 95% ethanol and 6 parts of 10% H dropwise 2 O 2 ; After cooling, filter, wash, and keep at 110°C in a blast drying oven without blasting for 5h.

[0037] Mix the finished product with 30 parts of nano-scale manganese tetroxide, 65 parts of micro-scale manganese t...

Embodiment 2

[0044] Preparation of nano-scale manganese tetroxide: take 60 parts by mass of 100-mesh black manganese ore powder and 25 parts of 10mol / L sodium hydroxide solution, after stirring evenly, pass nitrogen 0.5-0.7MPa, add 5 parts of octanol, 5 parts of butanol After 3-4 hours of constant temperature stirring reaction, filtered, washed, and pyrolyzed at a thermal decomposition temperature of 900 °C for 1 hour, the finished product was obtained;

[0045] Preparation of micron-sized manganese tetroxide: 60 parts of 0.5mol / LMnSO in an oil bath at 98°C by volume ratio 4 The solution, 30 parts of ammonia water, was stirred gently, pH=10, and the stirring time was 0.5h. Continue to add 10 parts of 95% ethanol and 10 parts of 10% H dropwise 2 O 2 ; After cooling, filter, wash, and keep at 120°C in a blast drying oven without blasting for 5h.

[0046] Mix the finished product with 55 parts of nano-scale manganese tetroxide, 40 parts of micro-scale manganese tetroxide, and 5 parts of Sp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Densityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a spherical high-density micro-nano-scale acid-soluble weighting material as well as a preparation method and application thereof. The weighting material is prepared from the following components in parts by mass: 30 to 70 parts of nanoscale manganous-manganic oxide, 30 to 65 parts of micron-sized manganous-manganic oxide and 0 to 5 parts of dispersing agent. The particle size range of the acid-soluble weighting material is 0.2-15 [mu] m, the particle size median is 6-8 [mu] m, the particles are regular spheres, the density is greater than 4.70 g / cm < 3 >, the hydrochloric acid dissolution rate is greater than 99.50%, the magnetic allowance is less than 0.0014 meu, the magnetic conductivity is less than 8.5 * 10 <-6 >, and the particles are spherical, not easy to settle and easy to flow back, safe, non-toxic and good in suspension property, and can be used as a shielding temporary plugging agent for plugging fine pores and microcracks. Due to the spherical structure, the low flowback pressure is achieved, and the good reservoir protection effect is achieved.

Description

technical field [0001] The invention relates to the technical fields of petroleum exploration and geotechnical excavation, in particular to a spherical high-density micro-nano-scale acid-soluble weighting material, a preparation method and application thereof. Background technique [0002] Fractures and karst caves are developed in high temperature and high pressure wells. For larger fractures or karst caves, the focus should be on preventing solid phase particle damage and stress-sensitive damage, and the positive pressure difference should be minimized to achieve near-balanced pressure drilling, which is the main protective measure for such reservoirs. The damage of solid phase particles is more serious in medium and high permeability reservoirs, and weaker in low permeability and ultra-low permeability reservoirs. However, when the reservoir fractures are developed, the damage of solid phase particles is more serious than that of medium and high permeability reservoirs. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K8/03C09K8/516C09K8/508C09K8/506C09K8/88C09K8/86C09K8/92C01G45/02B82Y40/00
CPCC09K8/03C09K8/516C09K8/5086C09K8/506C09K8/5045C09K8/885C09K8/86C09K8/845C09K8/92C01G45/02B82Y40/00C09K2208/10C01P2004/32C01P2004/61C01P2004/62C01P2006/10C01P2006/42
Inventor 张洁郝惠军王双威赵志良李龙刘继亮
Owner BC P INC CHINA NAT PETROLEUM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap