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Temporary plugging agent for medium/high-temperature oil-gas reservoir

A medium-high temperature, oil and gas reservoir technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of high viscosity of gel breaking fluid, achieve broad market prospects, save operation cycle, and excellent plugging performance

Active Publication Date: 2011-09-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In U.S. Patent 6214773, a method of adding a new type of titanium salt and zirconium salt crosslinking agent to improve the gel strength of the boron crosslinked guar gum system is proposed, but the problem of high viscosity of the gel breaking solution has not been solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At room temperature, weigh 80g of water into a beaker, then sequentially add 3g of acrylamide, 0.05g of N, N-methylenebisacrylamide and 0.005g of hydroquinone, stir until completely dissolved, then add 0.3g of xanthan Glue, stir until completely dissolved, then add 0.1g azobisisobutyrazine hydrochloride (AIBA) and 0.5g hydrogen peroxide solution (30%), add water to a total weight of 100g, stir until completely dissolved, and obtain temporarily Blocking agent. With a Brookfield viscometer at 170s -1 After measuring the initial viscosity of the prepared temporary plugging agent under the following conditions, put the temporary plugging agent into an oven at 90°C, and observe the time for polymerizing into jelly (gelation time) and the time for breaking the gel into clear liquid (gelation time). And measure the gel breaker at 170s -1 under the viscosity. The results are shown in Table 1.

[0026] Table 1 Formula and performance of temporary plugging agent with xanthan ...

Embodiment 2

[0029] At room temperature, weigh 80g of water into a beaker, then sequentially add 10g of acrylamide, 0.05g of N, N-methylene bisacrylamide, 0.03g of p-hydroxymethyl anisole, stir until completely dissolved, and then add 0.1g of partially hydrolyzed polyacrylamide, stirred until completely dissolved, added 0.2g of azobisisopropyl imidazoline and 5g of hydrogen peroxide solution (30%), added water to a total weight of 100g, and stirred until completely dissolved, that is Get temporary blocking agent. With a Brookfield viscometer at 170s -1 After measuring the initial viscosity of the prepared temporary plugging agent under the following conditions, put the temporary plugging agent into an oven at 95 ° C, observe the time for polymerization into jelly (gel forming time) and the time for breaking the gel into clear liquid (gel breaking time), And measure the gel breaker at 170s -1 under the viscosity. The results are shown in Table 2.

[0030] Table 2 Formulation and propert...

Embodiment 3

[0033] At room temperature, weigh 80g of water into a beaker, then sequentially add 6g of acrylamide, 0.05g of N, N-methylenebisacrylamide, 0.02g of tert-butylcatechol and stir until completely dissolved, then add 0.2g of melon Glue, after stirring until completely dissolved, add 0.3g of azobisisopropylimidazoline hydrochloride and 10g of hydrogen peroxide solution (30%), add water to a total weight of 100g, and stir until completely dissolved to obtain temporary Blocking agent. With a Brookfield viscometer at 170s -1 After measuring the initial viscosity of the prepared temporary plugging agent, put the temporary plugging agent into an oven at 85°C, and observe the time it takes to polymerize into a jelly (gelation time) and the time it takes to break into a clear liquid (gelation time). And measure the gel breaker at 170s -1 under the viscosity. The results are shown in Table 3.

[0034] Table 3 Temporary plugging agent formula and properties of guar gum as viscosifier (...

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Abstract

The invention relates to a temporary plugging agent for a medium / high-temperature (80-100 DEG C) oil-gas reservoir. The temporary plugging agent is prepared from the following components in percentage by mass: 2-20% of acrylamide, 0.02-0.5% of N,N-methylene-bisacrylamide, 0.005-0.03% of polymerization inhibitor, 0.05-0.3% of thickener, 0.005-1.0% of initiator, 0.1-10% of viscosity breaker and thebalance of water. The initiator is azobis(isobutylamidine hydrochloride), azodiisopropyl imidazoline or azodiisopropyl imidazoline hydrochloride; and the viscosity breaker is hydrogen peroxide, peracetic acid or peracetate. The temporary plugging agent can form high-strength gel under medium / high-temperature stratum conditions, can gelatinize within the specified time and thoroughly break the viscosity, does not damage the stratum after viscosity breaking, and can adapt to sectionalized reconstruction, repeated reconstruction and turning reconstruction of a long well interval of a medium / high-temperature oil-gas reservoir as well as temporary plugging operation of the well interval and stratum in need of temporary plugging.

Description

Field of invention: [0001] The invention relates to a high-strength temporary plugging agent used in the temporary plugging operation of medium and high temperature (80-100 DEG C) oil and gas reservoirs. Background technique: [0002] In the stimulation process of horizontal wells or long-section vertical wells and highly deviated wells, because the well section is long, it will pass through formations with different permeability and different damage degrees, and the whole well section cannot achieve the purpose of effectively stimulating the reservoir at one time. , it is often necessary to carry out segmental reconstruction on the long well section. The conventional mechanical plugging process of lowering bridge plugs and packers requires multiple tripping of the pipe string, which has a long reconstruction period, high operating costs, and the risk of sand stuck in the pipe string. For this reason, it is necessary to find a chemical temporary plugging agent, which can fo...

Claims

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Application Information

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IPC IPC(8): C09K8/42
Inventor 杨贤友樊剑刘玉章韦莉熊春明连胜江周福建林庆霞石阳李向东刘雄飞
Owner PETROCHINA CO LTD
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