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High-strength temporary blocking agent and preparation method thereof

A temporary plugging agent, high-strength technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of inability to use temporary plugging operations, cannot adapt to temporary plugging operations in medium and low temperature reservoirs, and achieve excellent plugging. performance, improve fracturing effect, save operation cycle effect

Active Publication Date: 2010-12-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plugging systems in these patents can only form high-strength plugging in the formation, and the strong gel system formed under the formation conditions cannot break the gel and cause permanent plugging, so it cannot be used for temporary plugging operations
[0006] In Chinese patent 99113250.5, a system composed of polyacrylamide, magnesium oxide, acrylamide, methylene bisacrylamide, ammonium persulfate and water is used to form a colloid through polymerization reaction at 50°C. After the steam is injected, the gel is broken by heat treatment to solve the problem of temporary plugging in steam stimulation. Since the formed gel cannot be broken in a medium and low temperature environment, this technology cannot be applied to the temporary plugging operation of medium and low temperature reservoirs.

Method used

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  • High-strength temporary blocking agent and preparation method thereof
  • High-strength temporary blocking agent and preparation method thereof
  • High-strength temporary blocking agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] At room temperature, weigh 80g of water into a beaker, then sequentially add 3g of acrylamide, 0.05g of methylene bisacrylamide, 0.01g of hydroquinone and stir until completely dissolved, then add 0.3g of xanthan gum and stir After it is completely dissolved, add 10g of ammonium persulfate and water to a total weight of 100g, and stir until it is completely dissolved to obtain a temporary blocking agent. With a Brookfield viscometer at 170s -1 After measuring the initial viscosity of the prepared temporary blocking agent under the following conditions, put the temporary blocking agent into a 45°C oven to polymerize into a gel, and observe the time for the polymerization to become a jelly (gelation time) and the time for the gel to be broken into a clear liquid (gelation time). time), and measure the breaker at 170s -1 under the viscosity. The results are shown in Table 1.

[0021] Table 1 Formula and performance of temporary plugging agent with xanthan gum as viscosi...

Embodiment 2

[0024] At room temperature, weigh 65g of water into a beaker, then sequentially add 9g of acrylamide, 0.05g of methylene bisacrylamide, 0.03g of p-hydroxymethyl anisole and stir until completely dissolved, then add 0.1g of polypropylene Amide, stir until completely dissolved, add 20g of sodium persulfate and water to a total weight of 100g, and stir until completely dissolved to obtain a temporary blocking agent. With a Brookfield viscometer at 170s -1 After measuring the initial viscosity of the prepared temporary blocking agent under the following conditions, put the temporary blocking agent into a 45°C oven to polymerize into a gel, and observe the time for the polymerization to become a jelly (gelation time) and the time for the gel to be broken into a clear liquid (gelation time). time), and measure the breaker at 170s -1 under the viscosity. The results are shown in Table 2.

[0025] Table 2 Formula and performance of temporary plugging agent with polyacrylamide as ta...

Embodiment 3

[0028] At room temperature, weigh 40g of water into a beaker, then sequentially add 15g of acrylamide, 0.05g of methylene bisacrylamide, 0.05g of tert-butyl catechol and stir until completely dissolved, then add 0.5g of guar gum After stirring until completely dissolved, add 40g of ammonium persulfate and water to a total weight of 100g, and stir until completely dissolved to obtain a temporary blocking agent. With a Brookfield viscometer at 170s -1 After measuring the initial viscosity of the prepared temporary blocking agent under the following conditions, put the temporary blocking agent into a 60°C oven to polymerize into a gel, and observe the time for the polymerization to become a jelly (gelation time) and the time for the gel to be broken into a clear liquid (gelation time). time), and measure the breaker at 170s -1 under the viscosity. The results are shown in Table 3.

[0029] Table 3 Temporary plugging agent formula and performance of guar gum as a viscosifier (6...

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Abstract

The invention relates to a high-strength temporary blocking agent and a preparation method thereof. The temporary blocking agent consists of the following components in percentage by mass: 2 to 20 percent of acrylamide, 0.02 to 0.1 percent of N,N-methylene-bisacrylamide, 0.001 to 0.1 percent of polymerization inhibitor, 0 to 1.0 percent of thickening agent, 2 to 50 percent of initiation gel breaker and the balance of water. The high-strength temporary blocking agent can form high-strength gel under intermediate / low-temperature reservoir conditions, can realize gel-formation and complete gel breaking in a given time, has no damage to the reservoir after the gel breaking and can be adapted to the temporary blocking operation of intermediate / low temperature oil-gas reservoirs.

Description

Field of invention: [0001] The invention relates to a formula of high-strength temporary plugging agent used in temporary plugging operations of medium and low temperature oil and gas reservoirs and a preparation method thereof. Background technique: [0002] In the fracturing process of horizontal wells, since the horizontal section is long and will pass through formations with different permeability, one fracturing of the entire horizontal well section cannot achieve the purpose of effectively stimulating the reservoir. Therefore, staged fracturing is required. Using the mechanical plugging method of lowering bridge plugs and packers requires multiple tripping of the pipe string, which has a long fracturing cycle, high operating costs, and the risk of sand stuck in the pipe string. Therefore, it is necessary to seek a chemical temporary plugging agent, which can form a high-strength temporary plugging agent jelly in front of the fracturing target position in the horizontal...

Claims

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Application Information

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IPC IPC(8): C09K8/512
Inventor 杨贤友樊剑刘玉章熊春明韩冬韦莉连胜江周福建林庆霞石阳
Owner PETROCHINA CO LTD
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