Drilling plugging fluid and preparation method thereof

A plugging fluid and drilling technology, which is applied to chemical instruments and methods, drilling compositions, etc., can solve the problems of leakage and the lack of sufficient strength of the plugging fluid, and achieves strong thixotropy, which is beneficial to environmental protection and durable. Good temperature performance

Active Publication Date: 2018-09-14
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defect of these plugging technologies is that the plugging fluid cannot form enough strength, and it is easy to cause new leakage during subsequent drilling.

Method used

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  • Drilling plugging fluid and preparation method thereof
  • Drilling plugging fluid and preparation method thereof
  • Drilling plugging fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of modified flax fiber

[0021] Put the flax fiber with a length of 2mm into the chamber of the low-temperature plasma processing instrument, turn on the vacuum pump, and press the pressure of 45cm when the vacuum degree in the chamber is less than 10Pa. 3 Oxygen was fed at a flow rate of 1 / min, and the flax fiber was modified by low-temperature plasma after adjusting the high-frequency power supply to 120w, and the modification time was 60s.

[0022] (2) Preparation of drilling plugging fluid

[0023] Add 100 parts of CaO to 100 parts of water successively, the content of CaO>10wt%, SiO 2 content>40wt% and fineness is 200-325 mesh nickel slag (curing agent), 1 part of modified flax fiber (bridging agent) prepared in step (1), 1 part of hydroxypropyl methylcellulose (suspension Stabilizer), 0.5 parts of sodium tetraborate (retarder), 2 parts of activator (mixed by sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate in a mass ratio of...

Embodiment 2

[0025] (1) Preparation of modified flax fiber

[0026] Put the flax fiber with a length of 1mm into the chamber of the low-temperature plasma treatment instrument, turn on the vacuum pump, and press the pressure of 40cm when the vacuum degree in the chamber is 3 Oxygen was introduced at a flow rate of 1 / min, and the flax fiber was modified by low-temperature plasma after adjusting the high-frequency power supply to 100w, and the modification time was 100s.

[0027] (2) Preparation of drilling plugging fluid

[0028] Add 150 parts of CaO to 100 parts of water successively, the content of CaO>10wt%, SiO 2 content>40wt% and fineness is 200-325 purpose nickel slag (curing agent), 10 parts of modified flax fibers (bridging agent) prepared in step (1), 2 parts of hydroxypropyl methylcellulose (suspension Stabilizer), 5 parts of sodium polyphosphate (retarder), 10 parts of activator (by mixing sodium hydroxide, sodium carbonate, sodium sulfate and sodium silicate in a mass ratio of ...

Embodiment 3

[0030] (1) Preparation of modified flax fiber

[0031] Put the flax fiber with a length of 0.5mm into the chamber of the low-temperature plasma processing instrument, turn on the vacuum pump, and press 50cm when the vacuum degree in the chamber is less than 10Pa. 3 Oxygen was introduced at a flow rate of / min, and the low-temperature plasma modification of the flax fiber was started after adjusting the high-frequency power supply to 80w, and the modification time was 300s.

[0032] (2) Preparation of drilling plugging fluid

[0033] Add 60 parts of CaO to 100 parts of water successively, the content of CaO>10wt%, SiO 2 content>40wt% and fineness is 200-325 purpose nickel slag (solidifying agent), the modified flax fiber (bridging agent) prepared in 8 parts of step (1), 0.5 part of hydroxypropyl methylcellulose (suspension Stabilizer), 2 parts of sodium dihydrogen phosphate (retarder), 8 parts of activator (mixed by sodium hydroxide, sodium carbonate, sodium sulfate and sodiu...

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Abstract

The invention relates to a drilling plugging fluid and a preparation method thereof, and belongs to the technical field of oil and gas exploration and development. The plugging fluid comprises, by weight, 60-150 parts of curing agent, 1-10 parts of bridging agent, 0.5-2 parts of suspension stabilizer, 0.5-5 parts of retarder, 2-10 parts of activating agent, 2-15 parts of activation auxiliary, 10-180 parts of density regulator and 100 parts of water, wherein the curing agent is nickel slag, and the bridging agent is modified flax fiber. The plugging fluid is good in liquidity and strong in thixotropy, can effectively enter the leakage cracks of different scales, and solidifies and hardens in a short time to form strength; the plugging fluid is good in chemical compatibility with a drillingfluid and cement paste, the construction safety is high, the application temperature range is 25-150 DEG C, and the temperature resistance is good. The preparation method is simple and feasible, and is good in practicality in plugging in the drilling process of petroleum and natural gas wells, in coal-bed gas wells and shale gas wells.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a drilling plugging fluid and a preparation method thereof. Background technique [0002] In wells such as oil and gas wells, coalbed methane wells, and shale gas wells, complex geological conditions are often encountered, such as the development of faults, severe stratum fragmentation, and weak pressure bearing capacity. When the viscosity is high and the flow capacity is poor, lost circulation often occurs, and in the process of casing running, reaming, and cement injection, the excited pressure generated by the high-viscosity slurry will generate additional pressure in the well, which will lead to lost circulation again. happened. According to the causes of lost circulation, lost circulation can be divided into four categories: permeable loss, fractured loss, karst-cavity lost and fractured lost. For wells with lost circulation, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08
Inventor 李彦明徐树斌王清峰郭志军潘小叶郭昆明肖丽辉杜坤崔刚明孔伟
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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