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Controllable expanded plugging agent

A technology of plugging agent and content, which is applied in the field of expansion plugging agent, which can solve the problems that the strength and temperature resistance of water-absorbing resin cannot meet the plugging requirements, the plugging material does not have expansibility, and affects the performance of drilling fluid, etc., so as to improve the leakage Formation, reduced processing time and cost, good strength effect

Inactive Publication Date: 2011-08-10
XINJIANG GRAND OILFIELD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the plugging materials for controlling well leakage have the following defects: first, the deformability of itself is poor during the plugging process, and particles slightly larger than the pores and fractures of the leakage layer or which do not match the shape of the pores and fractures of the leakage layer are not easy to enter. Accumulation is formed on the surface of the leakage layer, but does not penetrate into the leakage layer
Second, the plugging material does not have expansibility or only has a small amount of expansion, so it is not easy to stay in the leakage layer stably under the action of external force
However, the water-swelling chemical plugging agent absorbs water too fast, and if it is used in the plugging operation, it will easily cause pumping difficulties, affect the performance of the drilling fluid, and have a considerable weakening effect on the plugging effect.
And for some large fractures and high permeability formations, the strength and temperature resistance of the water-absorbing resin cannot meet the plugging requirements

Method used

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  • Controllable expanded plugging agent

Examples

Experimental program
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Effect test

example 1

[0023] Example 1: The preparation method of controllable expansion plugging agent KP.

[0024] First put 120g of water into the reaction tank, slowly add 7g of acrylic acid (AA) and 21g of acrylamide (AM) while stirring; after completely dissolving, slowly add 30% NaOH solution of neutralizer dropwise to adjust the pH value of the solution to 9-11; then slowly add ultra-fine CaCO33g, cross-linking agent NMBA0.05g, initiator Na2SO3 and (NH4)2S2O80.6g, after the addition is completed, stir and react at a constant temperature of 50°C in a water bath for 50-150min; after the reaction is completed , to obtain an elastic gel, which is cut and dried, and the sample is set aside; then 40g of paraffin is heated to a liquid state, and the above sample is added to the liquid paraffin, and the emulsifier Span 80 5g is slowly added, and the stirring is continued for 30-45 Minutes until the sample is uniformly dispersed in liquid paraffin; then dried and crushed at 70°C to obtain the contro...

example 2

[0025] Example 2: KP The effect in drilling fluid (experimental results are shown in Table 2).

[0026] Table 2 KP Drilling Fluid Properties

[0027]

[0028] Note: 1. The original slurry is 6% Anqiu secondary soil slurry. 2. The plugging capacity is measured by sand packing method, the condition is 600Psi.

[0029] From the results in Table 2, it can be seen that MFA-2 Adding as expanded particles into the original slurry can effectively seal the filling layer. If the original slurry is completely filtered off, the permeability of clear water is ∞, while adding 5% KP After the product, the penetration rate is very low, visible, KP With strong plugging ability, it can effectively and quickly achieve the purpose of plugging, and because KP has good expansibility, as time goes on, the permeability continues to decrease, and the plugging ability is stabilized. Therefore, KP has good plugging performance and can be widely used in drilling operations.

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Abstract

The invention relates to a controllable expanded plugging agent used for drilling plugging operation of an oil and gas field. The controllable expanded plugging agent has the characteristics of expansion controllability, deformability, adaptivity and the like. A technical scheme of the invention is that the ingredients and contents of raw materials used for preparing the plugging agent are as follow: 120 g of water, 7-12 g of acrylic acid, 18-23 g of acrylic amine, 3-6 g of ultrathin CaCO3 (Calcium Carbonate), 12-20 g of neutralizer, 0.05-1 g of crosslinking agent, 0.4-0.8 g of initiators, 3-7 g of emulsifier and 35-45 g of paraffin wax; a preparation method of the plugging agent comprises the steps of putting 120 g of water into a reaction tank; adding the acrylic acid and the acrylic amine at the same time of stirring; dropping the neutralizer NaOH (Sodium Hydroxide) after the solution is dissolved and regulating the pH value of the solution to be 9-11; then adding the ultrathin CaCO3, the crosslinking agent NMBH (Novel Microemulation-based Hydrogel) and initiators Na2SO3 (Sodium Sulfite) and (NH4)S2O8 (Ammonium Persulfate); stirring to react for 50-150 minutes at 40-60 DEG C soas to obtain a sample; heating the paraffin wax to a liquid state; adding the sample into the paraffin wax; adding Span 80; and uniformly stirring, drying and grinding to obtain the product. The product of the invention, which is a multifunctional plugging agent with a controllable expansion speed, is used for the drilling plugging operation of the oil and gas field.

Description

technical field [0001] The invention relates to a controllable expansion plugging agent used in drilling plugging operations in oil and gas fields, in particular to an expansion plugging agent capable of controlling its water absorption speed. Background technique [0002] At present, the plugging materials for controlling well leakage have the following defects: first, the deformability of itself is poor during the plugging process, and particles slightly larger than the pores and fractures of the leakage layer or which do not match the shape of the pores and fractures of the leakage layer are not easy to enter. Accumulation is formed on the surface of the leakage layer, but does not go deep into the leakage layer. The second is that the plugging material does not have expansibility or only has a small amount of expansion, so it is not easy to stay in the leakage layer stably under the action of external force. Due to the above reasons, when using these plugging materials,...

Claims

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Application Information

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IPC IPC(8): C09K8/42
Inventor 王平全唐继平伊达苗娟梁红军潘丽娟
Owner XINJIANG GRAND OILFIELD TECH
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