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Plugging material as well as preparation method and application thereof

A plugging material and structural unit technology, applied in the field of plugging materials and its preparation, can solve problems such as well wall instability, damage to oil and gas layers, and stuck pipe, so as to improve the plugging pressure bearing capacity, enhance the interface effect, increase The effect of structural rigidity

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the drilling operation, once leakage occurs, not only the drilling time will be delayed, the drilling fluid will be lost, the oil and gas layers will be damaged, and the normal progress of the geological logging work will be affected, but also the well wall may become unstable, leading to a series of well collapse, pipe sticking, blowout and so on. Complex situations and accidents, if not handled properly, can lead to wellbore scrapping and significant economic losses

Method used

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  • Plugging material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Weigh 20g of vinyltriethoxysilane and 30g of kaolin, add them into 300ml of ethanol, stir and disperse thoroughly, raise the temperature at 60°C for 3h to obtain material A, then centrifuge, and dry the solid at 90°C for 12h for later use. Take 30g of cornstarch and make it into a 20wt% water suspension, and react at 90°C for 2h to obtain gelatinized starch. Take 25g of methacryloyloxyethyl-N, N-dimethylpropanesulfonate to prepare a 45wt% aqueous solution. Add the material A, gelatinized starch and monomer solution into 220 g of water in which 3 g of sodium dodecylbenzene sulfonate is dissolved, and fully stir to emulsify and disperse. After raising the temperature to 65°C, 1.5 g of ammonium persulfate was added and reacted for 3 hours. After the reaction, wash twice with deionized water, dry at 110° C. for 8 hours, and pulverize to finally obtain the plugging material.

Embodiment 2

[0057] Weigh 7.5g of vinyltrichlorosilane and 30g of kaolin, add them into 300ml of ethanol, stir and disperse fully, raise the temperature at 90°C for 1h to obtain material A, then centrifuge, and dry the solid at 90°C for 12h for later use. Take 30g of cornstarch and make it into 20% water suspension, react at 95°C for 1h to get gelatinized starch. Get 25g of N,N-dimethylallylaminopropanesulfonate and prepare 60% aqueous solution. Add material A, gelatinized starch and monomer solution into 200 g of water in which 10 g of sodium dodecylbenzene sulfonate is dissolved, and fully stir to emulsify and disperse. After raising the temperature to 90°C, 1.3 g of ammonium persulfate was added and reacted for 2 hours. After the reaction, wash twice with deionized water, dry at 120° C. for 10 h, and pulverize to finally obtain the plugging material.

Embodiment 3

[0059] Weigh 30g of vinyltrimethoxysilane and 30g of montmorillonite, add them into 300ml of methanol, fully stir and disperse, raise the temperature at 80°C for 2h to obtain material A, then centrifuge, and dry the solid at 120°C for 8h for later use. Take 30g of potato starch and make it into a 15% water suspension, and react at 90°C for 2h to obtain gelatinized starch. Get 25g of methacryloyloxyethyltrimethylammonium chloride and prepare 40% aqueous solution. Add material A, gelatinized starch and monomer solution into 230 g of water in which 0.23 g of sodium lauryl sulfate is dissolved, and fully stir to emulsify and disperse. After heating up to 60°C, 1.6g of sodium persulfate was added and reacted for 4h. After the reaction, wash twice with deionized water, dry at 100° C. for 8 hours, and pulverize to finally obtain the plugging material.

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Abstract

The invention discloses a leaking stoppage material as well as a preparation method and application thereof. The leaking stoppage material comprises a structural unit A, a structural unit B, a structural unit D and a structural unit E, the structural unit B and the structural unit E are connected through the structural unit D; the structural unit A is starch; the structural unit B is a vinyl-containing monomer structural unit; the structural unit D is a silane coupling agent structural unit; the structural unit E is a clay mineral unit. The preparation method of the plugging material comprises the following steps: firstly, mixing and reacting the silane coupling agent, the organic solvent and the clay mineral to prepare a material A; and then uniformly mixing with gelatinized starch, a vinyl-containing monomer, a surfactant and water, adding an initiator for contact reaction, and washing and drying to obtain the plugging material. The plugging material has the characteristics of high structural rigidity and high loading capacity.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a plugging material and a preparation method thereof. Background technique [0002] Lost circulation is a technical problem that always exists in the process of drilling, cementing, logging and workover. Because the downhole complex situation caused by lost circulation is very harmful to the drilling and completion construction, the lost circulation has always been a matter of great concern to the petroleum engineering circles at home and abroad. In the drilling operation, once leakage occurs, not only the drilling time will be delayed, the drilling fluid will be lost, the oil and gas layers will be damaged, and the normal progress of the geological logging work will be affected, but also the well wall may become unstable, leading to a series of well collapse, pipe sticking, blowout and so on. Complications and accidents, if not handled properly, can l...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F251/00C08F220/38C08F226/02C08F220/34C08F220/58C08F222/02C08F226/10C08F220/44C09K8/035C09K8/42C09K8/467E21B33/138
CPCC08F292/00C08F251/00C09K8/035C09K8/426C09K8/467E21B33/138C08F220/387C08F226/02C08F220/34C08F220/585C08F222/02C08F226/10C08F220/44
Inventor 杨超吴炳乾赵林仝继昌王晨赵凯强刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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