Drilling fluid bridging particle, preparation method thereof, and drilling fluid plugging agent

A technology of drilling fluid and lost circulation agent, which is applied in the fields of plugging agent for drilling fluid and bridging lost circulation agent for drilling fluid. The effect of reducing the leakage amount and shortening the construction period

Active Publication Date: 2019-06-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bridge plugging agent for drilling fluid and its preparation method and a plugging agent for drilling fluid, to solve the problem of high cost of existing bridg

Method used

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  • Drilling fluid bridging particle, preparation method thereof, and drilling fluid plugging agent

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Embodiment 1

[0033] The bridging and plugging agent for drilling fluid in this embodiment comprises: by weight percentage, 40% of sand and 60% of filling material; wherein, the sand includes primary sand with a particle diameter of 0.2mm, and the particle diameter is 0.1mm The mass ratio of the primary sand to the secondary sand is 1:0.8, and the filling material includes a rigid material and a variable material with a mass ratio of 1:0.8, and the rigid material has a particle size of 0.02mm ultrafine calcium carbonate powder, and the variable material is graphite powder with a particle diameter of 0.01mm.

Embodiment 2

[0035] The bridging and plugging agent for drilling fluid of the present embodiment includes: by weight percentage, 60% of sand and 40% of filling material; wherein, the sand includes primary sand with a particle diameter of 0.25mm, and the particle diameter is 0.2mm The mass ratio of the primary sand grains to the secondary sand grains is 1:1, and the filling material includes a rigid material and a variable material with a mass ratio of 1:1.2, and the rigid material has a particle size of 0.08mm silica powder, the variable material is asphalt powder with a particle size of 0.06mm.

Embodiment 3

[0037] The bridging and plugging agent for drilling fluid of the present embodiment comprises: by weight percentage, 55% of sand grains and 45% of filling materials; wherein, the sand grains include primary sand grains with a grain diameter of 0.24mm, and the grain diameter is 0.12mm The mass ratio of primary sand to secondary sand is 1:1.2. The filling material includes rigid material and variable material with a mass ratio of 1:1. The rigid material has a particle size of 0.06mm ultrafine calcium carbonate powder, the variable material is elastic graphite powder with a particle diameter of 0.03mm.

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Abstract

The invention discloses a drilling fluid bridging particle, a preparation method thereof, and a drilling fluid plugging agent, and belongs to the technical field of oil field leak stopping. The drilling fluid bridging particle comprises, by weight, 40 to 60% of sand, and 40 to 60% of a filling material, wherein the particle size of the sand ranges from 0.1 to 0.25mm, the filling material comprisesa rigid material and a deformable material at a mass ratio of 1: (0.8-1.2). In well drilling process at desert regions, the drilling fluid bridging particle is capable of forming stable plugging layers rapidly, the properties are stable, well shaft loss problem is solved, and at the same time, the main particle bridging material in the drilling fluid bridging particle can be obtained from local sources, transportation cost is reduced effectively, and construction personnel safety is ensured.

Description

technical field [0001] The invention relates to the technical field of oil field plugging, in particular to a bridging plugging agent for drilling fluid, a preparation method thereof, and a plugging agent for drilling fluid. Background technique [0002] The lost circulation problem is one of the common and difficult downhole complex situations in oil and gas drilling engineering. It will not only increase the drilling cost and prolong the construction time, but also easily cause other downhole complex accidents such as blowout and well collapse, and even cause oil and gas wells to fail. Scrapping poses a huge threat to engineering construction and personnel safety. [0003] The existing common special plugging materials can be roughly divided into cement plugging materials, chemical gel plugging materials and bridging plugging materials. Among them, bridging plugging materials have the widest application range. Bridging and plugging agents are generally composed of bridgi...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/035C09K8/42C09K8/514
CPCY02P20/141
Inventor 王贵杨京华蒲晓林杜辉马天寿
Owner SOUTHWEST PETROLEUM UNIV
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