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A pressure-sensitive chemical plugging agent for channeling and leakage sealing

A technology of pressure-sensitive chemistry and plugging agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low bonding strength of solidified body, poor retention, and low success rate of plugging at one time, and achieve strong Residency and anti-channeling ability, increase in filtration speed, and increase the effect of filtration water loss speed

Active Publication Date: 2021-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned prior art, the present invention provides a pressure-sensitive chemical plugging agent for channeling and leakage sealing. The pressure-sensitive chemical plugging agent can solve the problem of poor retention of conventional plugging agents and low cementation strength of the cured body, resulting in a one-time plugging problem. low success rate

Method used

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  • A pressure-sensitive chemical plugging agent for channeling and leakage sealing
  • A pressure-sensitive chemical plugging agent for channeling and leakage sealing
  • A pressure-sensitive chemical plugging agent for channeling and leakage sealing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 prepares pressure-sensitive chemical plugging agent

[0028] The components are: 88% aluminate superfine cement, 6% metal oxide nano-filler, 0.2% suspension stabilizer wood calcium, 1.8% algae chert, 1.4% fiber bridging agent, micro-expansion agent plus Amount 2.6%.

[0029] The particle size of the aluminate superfine cement is 20-50 μm.

[0030] The metal oxide is Al 2 o 3 , the particle size is 0.02~1um.

[0031] The fibers are wood fibers.

[0032] The algae chert is prepared by the following method: take diatomite, bentonite and perlite, mix them, and the mass ratio of diatomite, bentonite and perlite is 8:1:1; then pulverize, Calcined at 1500°C for 2 hours, cooled to room temperature, and finally ground the clinker (after grinding, 95% of the total amount of the mixture with a particle size not greater than 35 μm was obtained).

[0033] The micro-expansion agent is prepared by mixing CaO and sulfate in a molar ratio of 1:1. The sulfate is CaSO 4...

Embodiment 2

[0036] Embodiment 2 prepares pressure-sensitive chemical plugging agent

[0037] The components are as follows: 88% of aluminate superfine cement, 8% of metal oxide, 0.2% of wood calcium, 1.8% of algae siliceous rock, 1.4% of fiber, and 2.7% of micro expansion agent.

[0038] The particle size of the aluminate superfine cement is 20-50 μm.

[0039] The metal oxide is Fe 2 o 3 , the particle size is 0.02~1um.

[0040] The fibers are wood fibers.

[0041] The algal chert is prepared by the following method: take diatomite, bentonite and perlite, mix them, and the mass ratio of diatomite, bentonite and perlite is 7.5:1.2:0.8; then pulverize, Calcined at 1500°C for 2 hours, cooled to room temperature, and finally ground the clinker (after grinding, 95% of the total amount of the mixture with a particle size not greater than 35 μm was obtained).

[0042] The micro-expansion agent is formed by mixing MgO and sulfate in a molar ratio of 0.8:1.2. The sulfate is CaSO 4 0.5H 2 O...

Embodiment 3

[0044] Embodiment 3 preparation pressure-sensitive chemical plugging agent

[0045] The components are as follows: 91% of aluminate superfine cement, 4% of metal oxide, 0.4% of wood calcium, 1.2% of algae siliceous rock, 1.8% of fiber, and 1.5% of micro expansion agent.

[0046] The particle size of the aluminate superfine cement is 20-50 μm.

[0047] The metal oxide is TiO 2 , the particle size is 0.02~1um.

[0048] The fibers are wood fibers.

[0049] The algal chert is prepared by the following method: take diatomite, bentonite and perlite, mix them, and the mass ratio of diatomite, bentonite and perlite is 8.5:0.8:1.2; then pulverize, Calcined at 1500°C for 2 hours, cooled to room temperature, and finally ground the clinker (after grinding, 95% of the total amount of the mixture with a particle size not greater than 35 μm was obtained).

[0050] The micro-expansion agent is prepared by mixing CaO and sulfate in a molar ratio of 1.2:0.8. The sulfate is CaSO 4 0.5H 2 ...

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Abstract

The invention discloses a pressure-sensitive chemical plugging agent for channeling and leakage sealing. Oxide, 0.2%~0.4% wood calcium, 1.2%~1.8% algae chert, 1.4%~1.8% fiber, 1.5%~2.7% micro expansion agent. The pressure-sensitive chemical plugging agent for channeling and leakage of the present invention has been proved by experiments that the thickening time is 5-8 hours, the linear expansion rate is 0.07%, the temperature resistance is above 120°C, the compressive strength of the solidified body is above 29MPa, and the plugging rate reaches 99.9%, its thixotropy, temperature resistance, compression resistance, retention and non-shrinkage are good, with controllable initial setting time, rapid plugging of leakage points, compact structure of consolidated body without shrinkage, and high plugging strength Advantage.

Description

technical field [0001] The invention relates to a pressure-sensitive chemical plugging agent for channeling and leak sealing, belonging to the technical field of chemical plugging. Background technique [0002] With the deepening of oilfield development, the underground oil-water relationship and stress have become intricate, coupled with the increase of various oilfield production enhancement measures and long-term water injection development, especially pressurized water injection, oil and water well damage is very common, and the problem of well condition deterioration has become increasingly prominent. Especially in some old wells, due to the long service life of the oil layer casing, the cementing cement has not completely sealed the oil layer casing, and the free section and the sealed section of the casing are perforated due to corrosion, and casing leakage is becoming more and more serious. According to statistics, at present, the proportion of blow-by oil and water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
CPCC09K8/426C09K8/467
Inventor 李友培赵明宸姜亦栋彭绪勇覃忠校徐赋海徐云现王瑞军郭家东管磊方婧李力行
Owner CHINA PETROLEUM & CHEM CORP
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