Plugging agent for high-sulfur-content gas wells

A plugging agent, high-sulfur technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of damaged coiled tubing, not resistant to salt corrosion, high pump pressure, etc., to meet the requirements of water plugging, The effect of improving corrosion ability
CN105505352AActive Publication Date: 2016-04-20CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2016-04-20

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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.
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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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