Fast-water-loss plunger type plugging agent for drilling fluid and preparation method of plugging agent

A plugging agent and plunger technology, applied in the field of new plugging agents, can solve the problems of large particle sealing, inconsistent formulation, formation re-leakage, etc., achieving strong acid solubility, simple preparation, replacement and safe tripping Effect

Active Publication Date: 2022-02-15
沙克(天津)石油技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complicated on-site operation and preparation, and the formula is not uniform, large particles are easy to cause "door sealing" phenomenon, and have no strength, resulting in the illusion of successful plugging
When drilling, the plugging material that "seals the door" will continue to regurgitate, causing the formation to leak again

Method used

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  • Fast-water-loss plunger type plugging agent for drilling fluid and preparation method of plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The present invention provides a quick-losing plunger plugging agent for drilling fluid, which comprises the following components: 10 parts of diatomite, 15 parts of calcium sulfate, 15 parts of silicate, 1 part of anti-saline soil, and 10 parts of fiber , 5 parts of elastic material, 10 parts of calcium carbonate, and 5 parts of mica sheet. The particle size of the plugging agent material is distributed in microns (D50-22 μm). It needs to be prepared with water when used on site. The highest concentration can reach 35%. Weighted to 2.30g / cm 3 , the plugging slurry will completely lose water in 1-2 minutes under the action of 100PSI differential pressure. The elastic material includes 20 parts of natural rubber and 3 parts of calcium carbonate. Its preparation method is: 20 parts of natural rubber, 3 parts of calcium carbonate Parts can be added to the mixer and fully mixed. The fibers include plant fibers and mineral fibers, and the ratio of plant fibers to mineral fib...

Embodiment 2

[0018] The present invention provides a quick-losing plunger plugging agent for drilling fluid, which comprises the following components: 13 parts of diatomite, 18 parts of calcium sulfate, 180 parts of silicate, 2 parts of anti-saline soil, and 13 parts of fiber , 8 parts of elastic material, 13 parts of calcium carbonate, and 8 parts of mica sheet. The particle size of the plugging agent material is distributed in microns (D50-22 μm). It needs to be prepared with water when used on site. The highest concentration can reach 35%. Weighted to 2.30g / cm 3 , the plugging slurry will completely lose water in 1.5 minutes under the action of 100PSI differential pressure, and the elastic material includes 25 parts of natural rubber and 4 parts of calcium carbonate. The preparation method is: 25 parts of natural rubber and 4 parts of calcium carbonate are added to Fully mix in the mixer, the fibers include plant fibers and mineral fibers, the ratio of the plant fibers to mineral fibers...

Embodiment 3

[0020] The present invention provides a plunger plugging agent for rapid water loss of drilling fluid, which comprises the following components: 15 parts of diatomite, 20 parts of calcium sulfate, 20 parts of silicate, 3 parts of anti-saline soil, and 15 parts of fiber , 10 parts of elastic material, 15 parts of calcium carbonate, and 10 parts of mica sheet. The particle size of the plugging agent material is distributed in microns (D50-22 μm). It needs to be prepared with water when used on site. The highest concentration can reach 35%. Weighted to 2.30g / cm 3 , the plugging slurry will completely lose water within 2 minutes under the action of 100PSI differential pressure. The elastic material includes 30 parts of natural rubber and 5 parts of calcium carbonate. The preparation method is as follows: 30 parts of natural rubber and 5 parts of calcium carbonate are added Fully mix in the mixer, the fibers include plant fibers and mineral fibers, the ratio of the plant fibers to ...

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Abstract

The invention relates to a fast-water-loss plunger type plugging agent for a drilling fluid. The plugging agent comprises the following components in parts: 10-15 parts of diatomite, 15-20 parts of calcium sulfate, 15-20 parts of silicate, 1-3 parts of salt-resistant soil, 10-15 parts of fibers, 5-10 parts of an elastic material, 10-15 parts of calcium carbonate and 5-10 parts of mica sheets. The fast-water-loss plunger type plugging agent for the drilling fluid provided by the invention contains both a physical plugging material and a chemical plugging material; and after plugging slurry is prepared from the plugging agent and is injected into a leakage formation, the above components are subjected to chemical and physical reactions to different extents under the action of temperature and pressure; and in addition, through the synergistic effect of the components, all the different components of the plugging agent are firstly stacked and bridged in a leakage channel, then are packed and reinforced, and rapidly lose water to form a powerful plunger to plug a leakage layer. Moreover, the plugging agent has very strong temperature and pressure resistance and acid solubility, and the acid solubility can reach 90% or above in 15% HCL.

Description

technical field [0001] The invention belongs to the technical field of novel leak-stopping agents, and in particular relates to a plunger-type leak-stopping agent for rapid dehydration of drilling fluid. Background technique [0002] For the current severe leakage or lost return leakage, the current plugging measures mostly adopt the method of fiber + bridge plug + rigid particle plugging, and the amount of plugging materials is large and the amount added is large. It causes on-site operation and preparation to be complicated, and the formula is not uniform, and large particles are easy to cause the phenomenon of "sealing the door", and there is no strength, resulting in the illusion of successful plugging. When drilling, the plugging material that "seals the door" will continue to regurgitate, causing the formation to leak again. [0003] Severe leakage and return loss have become a worldwide problem restricting the progress of oil and gas exploration and development. Impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46C09K8/48
CPCC09K8/426C09K8/46C09K8/48C09K2208/08C09K2208/18Y02P20/141
Inventor 赵晓光班士军史云梅
Owner 沙克(天津)石油技术服务有限公司
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