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Bionic polyvinyl alcohol plugging gel for bionic drilling stopping pressure-bearing plugging drilling fluid

A polyvinyl alcohol and leakage gel technology, which is applied in the field of oil and gas well drilling, can solve the problems of plugging gel secondary leakage, poor connectivity, and repeated leakage, and achieve the effect of improving plugging effect and retention capacity

Pending Publication Date: 2021-11-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application process of the current plugging gel has also exposed certain shortcomings. Some plugging gels have secondary leakage after plugging. This is mainly because although a reliable cross-linking structure is formed between the gels, the The connection between the gel and the bridging material, and the fracture or the inner wall of the pore is poor, resulting in a residual lost space between the gel and the lost channel. move, causing relapse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The second aspect of the present invention provides a preparation method of bionic polyvinyl alcohol plugging gel, the method comprising:

[0023] (1) polyvinyl alcohol is modified by dihydroxybenzaldehyde to obtain modified polyvinyl alcohol;

[0024] (2) In the presence of a boron-based cross-linking agent, the modified polyvinyl alcohol and the tackifier are subjected to a cross-linking reaction in an aqueous solvent.

[0025] Preferably, the weight ratio of the modified polyvinyl alcohol to the tackifier is 1:0.01-0.8, preferably 1:0.1-0.5, such as 1:0.05-0.08, 1:0.1-0.15, 1:0.16 -0.2, 1:0.22-0.3, 1:0.32-0.4, preferably 1:0.05-0.15, or preferably 1:0.15-0.3, or preferably 1:0.2-0.4.

[0026] Preferably, on the modified polyvinyl alcohol, the content of the modifying groups provided by dihydroxybenzaldehyde is 5-40% by weight.

[0027] Preferably, the weight ratio of the modified polyvinyl alcohol to the boron crosslinking agent is 1:0.01-0.8, preferably 1:0.1-0.5,...

preparation example 1

[0040] (1) Heat 80 g of 10% by weight polyvinyl alcohol 1788 aqueous solution in a water bath to 80° C., stir at a rate of 100 to 150 r / min, and add hydrochloric acid (hydrochloric acid concentration is 10% by weight) dropwise with a dropper to adjust the pH of the system to 1 to 2;

[0041] (2) Under the protection of nitrogen, 4 g of 36% by weight 3,4-dihydroxybenzaldehyde aqueous solution was added dropwise within about 30 minutes; the reaction was continued for 0.5 hours and then cooled to 60°C; the pH value of the system was adjusted to 8-9 by dropping ammonia water , continue to react for 30min.

[0042] (3) Add the reaction solution dropwise to a large amount of deionized water to obtain an off-white precipitate, then repeatedly wash the product with deionized water to neutrality, then wash the unreacted 3,4-dihydroxybenzaldehyde and Excess acid and alkali.

[0043] (4) Vacuum-dry the product at 50-60° C. for 24 hours, and pulverize to obtain the modified polyvinyl alc...

preparation example 2

[0045] According to the method described in Preparation Example 1, the difference is that polyvinyl alcohol 1778 of equal weight was used instead of polyvinyl alcohol 1788 to obtain modified polyvinyl alcohol m-PVA powder C2.

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Abstract

The invention relates to the field of oil and gas well drilling, in particular to bionic polyvinyl alcohol plugging gel for bionic drilling stopping pressure-bearing plugging drilling fluid. The polyvinyl alcohol plugging gel contains modified polyvinyl alcohol and a tackifier, wherein the modified polyvinyl alcohol is crosslinked by a boron crosslinking agent, and the modified polyvinyl alcohol is dihydroxy benzaldehyde modified polyvinyl alcohol. On the basis of underwater adhesion performance shown by creatures such as mussels in nature, bionic strong adhesion groups are introduced to molecular chains of the plugging gel, so that the capacity of the plugging gel for adhering and bridging a plugging agent and a crack wall surface in a water wetting environment is improved, the plugging gel is effectively prevented from being dispersed and collapsed by formation water or drilling fluid, the organic gel retention capacity is improved, and the plugging effect is improved.

Description

technical field [0001] The invention relates to the field of oil and gas well drilling, in particular to a bionic polyvinyl alcohol plugging gel for a bionic drilling stoppage pressure plugging drilling fluid. Background technique [0002] In geological drilling, due to the existence of various natural loss channels in downhole formations, such as large pores, large fractures, large karst caves or their combinations, when drilling into formations containing these loss channels, drilling fluid and other working fluids are inevitable. The ground will go deep into the formation, causing a large loss of expensive drilling fluids. The serious harm of lost circulation lies in that the lost circulation will cause the liquid level of the drilling fluid column in the wellbore to decrease, so that the drilling fluid column can meet the requirements of supporting the mechanical balance downhole, resulting in complex downhole accidents such as well wall collapse, overflow, well kick, bl...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L29/14C08L1/28C08K3/38C08F8/28C08F116/06C09K8/035
CPCC08J3/075C08J3/24C08F8/28C09K8/035C08J2329/14C08J2401/28C08K2003/387C08F116/06
Inventor 蒋官澄董腾飞孙金声崔凯潇贺垠博杨丽丽骆小虎耿铁罗健生史赫
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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