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A plugging agent for high-sulfur gas wells

A plugging agent, high-sulfur technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of salt corrosion resistance, damaged coiled tubing, poor rheological properties, etc., to improve corrosion ability , to meet the effect of water blocking requirements

Active Publication Date: 2021-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor rheological properties of existing inorganic water shutoff agents in high-sulfur gas wells, excessive pump pressure when pumping through coiled tubing, and easy damage to coiled tubing, low plugging compressive strength, no Resistant to defects such as salt corrosion, providing a high-sulfur gas well plugging agent

Method used

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  • A plugging agent for high-sulfur gas wells
  • A plugging agent for high-sulfur gas wells
  • A plugging agent for high-sulfur gas wells

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In a beaker, mix 500g of high sulfur-resistant G grade cement, 150g of 180 mesh silicon powder, and a density of 2.2g / cm 3 Mix 30g of microsilicon into dry powder, mix 176g of water, 10g of alunite, 21g of sulfonated styrene, 3g of defoamer, 15g of stabilizer, 80g of carboxylated styrene-butadiene latex, and 15g of sulfoalkyl lignin in a mixing container. Slowly pour the dry powder in the beaker into the mixing container, turn on the agitator in the mixing container, and rotate it at a speed of 12,000 rpm for 35 seconds to obtain the plugging agent for high-sulfur gas wells.

Embodiment 2

[0023] In a beaker, put 550g of high sulfur-resistant G-grade cement, 130g of 180-mesh silicon powder, and a density of 2.2g / cm 3 Mix 15g of micro-silicon into dry powder, mix 174g of water, 10g of alunite, 10g of sulfonated styrene, 1g of defoamer, 15g of stabilizer, 80g of carboxylated styrene-butadiene latex, and 5g of sulfoalkyl lignin in a mixing container. Slowly pour the dry powder in the beaker into the mixing container, turn on the agitator in the mixing container, and rotate it at a speed of 12,000 rpm for 35 seconds to obtain the plugging agent for high-sulfur gas wells.

Embodiment 3

[0025] In a beaker, mix 400g of high sulfur-resistant G-grade cement, 180g of 180-mesh silicon powder, and a density of 2.3g / cm 3 Mix 30g of microsilicon into dry powder, mix 181g of water, 12g of alunite, 10g of dihydrate gypsum, 12g of sulfonated styrene, 10g of formamide, 3g of defoamer, 30g of stabilizer, 110g of carboxylated styrene-butadiene latex, Mix 12g of sulfoalkyl lignin and 10g of sulfonated tannin evenly, slowly pour the dry powder in the beaker into the mixing container, turn on the stirrer in the mixing container, and rotate it at a speed of 12000 rpm for 35 seconds to obtain high Plugging agent for sour gas wells.

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Abstract

The invention relates to a plugging agent for high-sulfur-content gas wells, belonging to the technical field of chemical products for water plugging and channel sealing in oil-gas wells. The plugging agent for high-sulfur-content gas wells is prepared by mixing the following components in percentage by mass: 40-55% of high-sulfur-resistance Grade-G cement, 13-18% of silicon powder, 1.5-3% of micro silicon, 8-11% of carboxylated styrene-butadiene latex, 0.1-0.3% of defoaming agent, 1.5-3% of stabilizer, 1-2.2% of expanding agent, 1-2.2% of dispersing agent, 1.5-2.2% of retarder and 17.4-18.1% of water. The plastic viscosity of the plugging agent at 89 DEG C is 20 mPa.s or below, so the plugging agent can be smoothly pumped into the downhole through a continuous oil pipe in the high-sulfur-content gas well; and the compression strength before and after the set cement corrosion of the plugging agent is respectively greater than 25 MPa, the permeability before and after the corrosion is respectively less than 1.2*10<-6> mu m<2>, and thus, the plugging agent implements long-term residence in the stratum and satisfies the requirements for water plugging for high-sulfur-content gas wells.

Description

technical field [0001] The invention relates to a plugging agent for high-sulfur gas wells, belonging to the technical field of chemical products for water plugging and channeling of oil and gas wells. Background technique [0002] As the edge and bottom water invasion of gas wells in high-sulfur gas fields is becoming more and more serious, it not only increases the difficulty of corrosion control in the surface gathering and transportation system, but also increases the reinjection pressure and treatment costs. The key to achieving stable production of gas wells is to control formation water output by water plugging in gas wells technology. The combination of mechanical pipe string and chemical water shutoff is commonly used for water shutoff in gas wells. The key to long-term effective shutoff of high-sulfur gas wells is chemical water shutoff agent. High sulfur gas wells generally have a vertical depth of about 6000m, well temperature is about 130°C, H 2 S content is 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C04B28/00
CPCC04B28/00C04B40/0039C04B2103/0068C04B2103/22C04B2103/408C04B2111/00724C04B2201/10C04B2201/50C09K8/467C04B14/36C04B14/062C04B24/2688C04B2103/50C04B24/42C04B24/02C04B24/32C04B24/16C04B22/143C04B22/148C04B24/163C04B24/124C04B24/18C04B24/38C04B24/168
Inventor 徐海民张庆生张文昌边江赵国瑜张诚魏丽丽常建芳
Owner CHINA PETROLEUM & CHEM CORP
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