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A plugging slurry for improving the pressure bearing capacity of lost formations and its preparation method

A technology of pressure-bearing capacity and plugging slurry, which is applied in the field of oil drilling, can solve the problems of small increase in the pressure-bearing capacity of the leaky layer, low success rate of one-time plugging, and complicated plugging process, so as to reduce the chance of recurrence of lost circulation, Plugging process The slurry mixing method is simple and convenient, and the extrusion sealing process is simple

Active Publication Date: 2020-03-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These plugging technologies and plugging agent products have the following problems: low success rate of one-time plugging, high price of plugging agent, complicated plugging process, small increase in leakage layer pressure bearing capacity, and poor environmental protection indicators

Method used

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  • A plugging slurry for improving the pressure bearing capacity of lost formations and its preparation method
  • A plugging slurry for improving the pressure bearing capacity of lost formations and its preparation method

Examples

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Effect test

Embodiment 1

[0025] This embodiment provides a plugging slurry for improving the pressure bearing capacity of the lost formation, which is composed of the following substances in mass percentage: fiber plastic solidification agent 55%; asphalt powder for drilling 2%, oil well cement defoamer 0.1%, water 42.9%.

[0026] The preparation process is as follows: adding formula quantity of water into a container, sequentially adding formula quantity of asphalt powder for drilling, fiber plastic coagulation curing agent, oil well cement defoamer, and stirring evenly to obtain.

[0027] In this embodiment, the fiber plasticizing agent is composed of the following substances in mass percentage: 4% mineral fiber, 3% wood fiber, 5% mica powder, 3% gypsum, and 85% oil well G grade cement. Among them, the mineral fiber is brucite fiber, the fiber type is longitudinal fiber, and the pile length is 3-5mm; the wood fiber is a compound of pine fiber, poplar fiber and banyan fiber (mass ratio is 1:1:1) , t...

Embodiment 2

[0030] This embodiment provides a plugging slurry for improving the pressure bearing capacity of the lost formation, which is composed of the following substances in mass percentage: 60% fiber plastic solidification agent; 1% asphalt powder for drilling, 0.05% oil well cement defoamer, water 38.95%.

[0031] The preparation process is as follows: adding formula quantity of water into a container, sequentially adding formula quantity of asphalt powder for drilling, fiber plastic coagulation curing agent, oil well cement defoamer, and stirring evenly to obtain.

[0032] In this embodiment, the fiber plasticizing agent is composed of the following substances in mass percentage: 3% mineral fiber, 2% wood fiber, 4% mica powder, 3% gypsum, and 88% oil well G grade cement. Among them, the mineral fiber is brucite fiber and asbestos fiber (mass ratio is 2:1), the fiber type is longitudinal fiber, and the pile length is 3-5mm; the wood fiber is pine fiber, and the fiber length is 2-6mm...

Embodiment 3

[0035] This embodiment provides a plugging slurry for improving the pressure bearing capacity of the lost formation, which is composed of the following substances in mass percentage: 58% fiber plastic solidification agent; 1.5% asphalt powder for drilling, 0.1% oil well cement defoamer, water 40.4%.

[0036] The preparation process is as follows: adding formula quantity of water into a container, sequentially adding formula quantity of asphalt powder for drilling, fiber plastic coagulation curing agent, oil well cement defoamer, and stirring evenly to obtain.

[0037] In this embodiment, the fiber plasticizing agent is composed of the following substances in mass percentage: 2% mineral fiber, 1% wood fiber, 4% mica powder, 2% gypsum, and 92% oil well G grade cement. Among them, the mineral fiber is a compound of asbestos fiber, brucite fiber and sepiolite fiber (mass ratio is 2:1:1), the fiber type is longitudinal fiber, and the pile length is 3-5mm; the wood fiber is pine fib...

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Abstract

The invention provides plugging slurry for enhancing pressure-bearing capacity of leakage formation. The plugging slurry is composed of the following substances (by weight): 55-60% of a curing agent for fiber coagulation, 1-2% of asphalt powder for well drilling, 0.05-0.1% of an oil well cement defoamer and 38-45% of water. The invention also provides a plugging method capable of enhancing pressure-bearing capacity of leakage formation during petroleum drilling process. The method has a good plugging effect on medium and large-scale lost circulation and meets requirements of drilling construction and environmental protection. The plugging technology requires fewer types of chemical materials, and the method for preparation of the plugging slurry is simple. A pressure-bearing squeeze plugging method has strong operationality. The product has a good effect of plugging fractures and pores of a leakage zone and can obviously reduce lost circulation velocity of the leakage zone. Plugging time is greatly shortened and plugging cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a plugging slurry for improving the pressure bearing capacity of a lost formation and a preparation method thereof. Background technique [0002] In the process of drilling and production, when a leakage layer is encountered, due to the low pressure bearing capacity of the leakage layer, frequent leakage occurs, which seriously restricts the drilling timeliness, increases the risk of downhole construction, and greatly increases the cost of oil and gas development, affecting the leakage area oil and gas exploration and development progress. The main technical problems of leakage plugging are as follows: 1. Leaky and easy-to-collapse layers belong to the same open hole section, and the pressure requirements for plugging are high; 2. Different leakage layers belong to the same open hole section, and it is difficult to accurately judge the location of the leaka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467E21B33/13
CPCC09K8/426C09K8/467E21B33/13
Inventor 朱明明肖剑峰陈华清刘磊孔维升
Owner BC P INC CHINA NAT PETROLEUM CORP
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