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Novel composite plugging agent for well drilling and application thereof

A plugging agent and drilling technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of plugging failure, bridging stay, door sealing, etc., and achieve construction safety, high pressure bearing capacity, and sealing Obvious blocking effect

Active Publication Date: 2020-03-10
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bridging plugging is mainly based on the particle size gradation principle, but the premise is to clearly grasp the characteristics of the leakage and fully understand the nature of the leakage layer, in order to choose a composite plugging material with a reasonable gradation, otherwise the plugging material will not be able to bridge the leakage channel Residing or forming a door-sealing phenomenon at the seam, resulting in plugging failure

Method used

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  • Novel composite plugging agent for well drilling and application thereof
  • Novel composite plugging agent for well drilling and application thereof
  • Novel composite plugging agent for well drilling and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take 9 parts of standard sampling sieve 2-4 mesh EPE foam, standard sampling sieve 20-40 mesh polypropylene plastic particles 40 parts, standard sampling sieve 60-180 mesh calcium carbonate powder 42 parts, the diameter is in the range of 0.001-0.1mm 9 parts of inner asbestos wool (chrysotile, the same as in the following examples) were mixed and stirred evenly to obtain the novel composite plugging agent for lost circulation in drilling.

Embodiment 2

[0050] Take 12 parts of standard sampling sieve 2-4 mesh EPE foam, standard sampling sieve 20-40 mesh PPS plastic 38 parts, standard sampling sieve 60-180 mesh quartz sand powder 35 parts, sea foam within the range of 0.001-0.1mm in diameter 15 parts of stone fiber, mixed and stirred evenly, the new composite plugging agent for drilling lost circulation is obtained.

Embodiment 3

[0052] Take 5 parts of standard sampling sieve 2-4 mesh EPE foam, standard sampling sieve 20-40 mesh PPS plastic 30 parts, standard sampling sieve 60-180 mesh calcium carbonate powder 50 parts, diameter 0.001-0.1mm 15 parts of ester fiber, mixed and stirred evenly to obtain the novel composite plugging agent for drilling lost circulation.

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Abstract

The invention provides a novel composite plugging agent for well drilling and an application thereof. The plugging agent includes, by mass, 20-40 parts of a granular bridging material, 30-60 parts ofa granular filling material, 5-20 parts of a fiber material and 4-12 parts of a soft foam material being polyethylene foam granules or foamed polystyrene granule, the mass parts of the components adding to 100 in total. A test proves that the plugging agent can plug cracks or holes with different seam widths of 2-8 mm, is good in retention effect, and has high pressure bearing capacity after leaking layer plugging. The plugging agent is safe in plugging construction, is easy to use, and has significant plugging effect under a complex geologic condition such as cracks and fractures.

Description

technical field [0001] The invention belongs to the technical field of oil field drilling plugging, in particular to a novel composite plugging agent for drilling and its application. Background technique [0002] The leakage of drilling fluid into the formation (referred to as lost circulation) is a common downhole complex situation in the drilling process, and the lost circulation problem is particularly prominent when drilling into formations with fractures and holes. Once lost circulation occurs, it not only affects the drilling timeliness, but also loses drilling fluid and damages oil and gas layers. In view of the above problems, it is common practice to add a plugging agent (or called a lost circulation agent) to the drilling fluid to improve its performance. [0003] At present, commonly used plugging agents mainly include bridge plugging, chemical gels, and inorganic gelling plugging agents. Among them, the chemical gel plugging is mainly based on the interaction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/502
CPCC09K8/502C09K2208/08C09K2208/18
Inventor 乐明赵正国郭建华田军吕跃滨
Owner 中石化石油工程技术服务有限公司