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A kind of delayed cross-linked gel composition for plugging and preparation method thereof

A gel composition and delayed cross-linking technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of drilling fluid dilution, drilling fluid loss, wellbore instability, etc., and reach the applicable range of temperature Wide range, strong pressure bearing capacity, and controllable crosslinking time

Active Publication Date: 2021-07-06
BEIJING INST OF EXPLORATION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of drilling fluid loss, drilling fluid dilution and wellbore instability caused by fractured loss formations, malignant loss formations and aquifers during drilling, the present invention provides a delayed cross-linked gel combination for plugging substances and their preparation methods

Method used

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  • A kind of delayed cross-linked gel composition for plugging and preparation method thereof
  • A kind of delayed cross-linked gel composition for plugging and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 30 g of magnesium silicate was added to 200 g of water to obtain a lithium silicate dispersion, and then 40 g of basalt fibers and 0.16 g of sodium citrate were added to give a mixed slurry, and then 1.2 g of hydroxypropyl gum was mixed to give a base liquid, and finally 0.6 g of a quadr-propyl zirconic acid ester was added to give a delayed crosslinking gel.

Embodiment 2

[0029] 40 g of magnesium silicate aluminum was mixed in 200 g of water to obtain a lithium silicate dispersion solution, and then 20 g of seafubi fibers, 2 g of glycolic acid and 1 g of sulfite were mixed to obtain a mixed slurry, followed by 1.1 g of hydroxypropyl flambol and 0.9 g of hydrophobic solid polymer is mixed to obtain a base fluid, and finally 0.8 g of a quadr-propyl zirconate mixture is mixed to obtain a delayed crosslinking gel.

Embodiment 3

[0031] 20 g of magnesium silicate aluminum was added 200 g of water to obtain a lithium silicate dispersion solution, and 40 g of polypropylene fibers, 4 g glycolic acid and 2 g of sodium thiosulfate were added to obtain a mixed slurry, followed by 1.6 g of hydroxypropyl gum gum. 0.4 g of hydrophobic solid polymer is mixed to obtain a base fluid, and finally 1.0 g of tetra-positive propyl zirconate mixture is mixed to delay crosslinking gel.

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Abstract

The invention discloses a delayed cross-linking gel composition for leakage plugging and a preparation method thereof. The composition is composed of the following components in parts by weight: 100 parts of water, 0.5-1 part of a gelling agent, and a cross-linking agent 0.3-0.6 parts, 0.05-2 parts of retarder, 10-20 parts of strengthening agent, 10-20 parts of toughening agent, 0-10 parts of high-temperature protection agent. The delayed cross-linking gel composition provided by the present invention is not limited by the leakage channel when plugging, the gel forming agent and the cross-linking agent undergo a cross-linking reaction in a mixed and flowing state, and stay in the leaking layer to form a three-dimensional network The viscoelastic body of the structure realizes the purpose of "adaptive" or broad-spectrum plugging; it has good anti-dilution performance, and it is difficult to be diluted by mixing with formation water; it can effectively plug the leakage channel and has high bearing strength. It is widely used in geological drilling and oil drilling plugging operations, and can solve the problems of fracture type leakage, malignant leakage and aquifer leakage of different depths.

Description

Technical field [0001] The present invention relates to geological drilling, oil and gas drilling and scientific drilling process, in particular, in particular, to a delayed crosslink gel and preparation methods thereof. Background technique [0002] Floor leakage is common problems that often encounter in metal mine, oil and gas, geothermal heat and other drilling. Strati loss not only causes a lot of waste, but also increases the cost of drilling, but also brings a series of complex perforations, affecting the efficiency of drilling. For large cracks, cavity-like malignant loss, conventional bridge plugging is difficult to form a sufficient intensity blocking body around the wellbore, plugging a success rate, and this method is not available under small wells, small circumvances Implementation. Cement pulp is often unable to function due to large stream loss of channels or cannot be solidified by groundwater, resulting in the failure of the plug. Crosslinking polymer gel pluggi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
CPCC09K8/426C09K8/467
Inventor 熊正强陶士先付帆李晓东纪卫军李艳宁
Owner BEIJING INST OF EXPLORATION ENG
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