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Plugging agent used for drilling fluid and preparation method thereof

A plugging agent and drilling fluid technology, applied in the field of drilling, can solve the problems of poor plugging effect of mud shale and inability to ensure well wall stability, etc., achieve good plugging, reduce the occurrence of downhole complex situations, and reduce API fluid loss Effect

Active Publication Date: 2014-10-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: the plugging effect of the above-mentioned plugging agent on mud shale is relatively poor, and the stability of the well wall cannot be guaranteed

Method used

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  • Plugging agent used for drilling fluid and preparation method thereof
  • Plugging agent used for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh raw materials: 200g of bentonite, 100g of acrylamide, 25g of 2-acrylamide-2-methylpropanesulfonic acid, 4g of sodium hydroxide, 100g of 1000 mesh calcium carbonate, 300g of water, N,N'-methylene Bisacrylamide 0.2g, sodium bisulfite 2g, ammonium persulfate 2g.

[0028] Preparation:

[0029] Step 1: adding the above-mentioned raw materials weighed into a kneader and stirring evenly to obtain a raw material mixture;

[0030] In the embodiment of the present invention, this step specifically includes:

[0031] 1a: Dissolve the weighed acrylamide and 2-acrylamido-2-methylpropanesulfonic acid into the weighed water, and then add them together into the kneader, and then add the weighed hydroxide Sodium, bentonite and 1000 mesh calcium carbonate, stir well;

[0032] Since bentonite can absorb acrylamide solution, dissolving acrylamide in water first and then mixing with other raw materials is more conducive to the uniform mixing of acrylamide and bentonite.

[0033] I...

Embodiment 2

[0040] Weigh raw materials: 180g of bentonite, 90g of acrylamide, 20g of 2-acrylamide-2-methylpropanesulfonic acid, 3g of potassium hydroxide, 90g of 1000 mesh calcium carbonate, 280g of water, N,N'-methylenebis Acrylamide 0.1g, sodium bisulfite 1.5g, ammonium persulfate 1.5g.

[0041] Preparation:

[0042] Step 1: same as embodiment one, only difference is that potassium hydroxide replaces sodium hydroxide;

[0043] Step 2: heating the above raw material mixture at 40°C and stirring for 0.5 hours to obtain a block jelly;

[0044] Step 3: Same as Embodiment 1.

Embodiment 3

[0046] Weigh raw materials: 220g of bentonite, 110g of acrylamide, 30g of 2-acrylamido-2-methylpropanesulfonic acid, 5g of sodium hydroxide, 110g of 1000 mesh calcium carbonate, 320g of water, N,N'-methylenebis Acrylamide 0.3g, sodium bisulfite 2.5g, ammonium persulfate 2.5g.

[0047] Preparation:

[0048] Step 1: same as embodiment one;

[0049] Step 2: heating the above raw material mixture at 60°C and stirring for 1 hour to obtain a block jelly;

[0050] Step 3: Same as Embodiment 1.

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Abstract

The invention discloses a plugging agent for a drilling fluid and a preparation method thereof, and belongs to the technical field of drilling. The plugging agent used for the drilling fluid comprises the following raw materials in parts by weight: 180-220 parts of bentonite, 90-110 parts of acrylamide, 20-30 parts of 2-acrylamido-2-methyl propane sulfonic acid, 3-5 parts of a hydrolysis degree regulator, 90-110 parts of calcium carbonate, 280-320 parts of water, 0.1-0.3 part of a crosslinking agent and 3-5 parts of a redox initiator. The polymerization of the acrylamide in bentonite interlayer can be induced by the redox initiator under certain conditions for generation of expandable deformable particles by cooperation with the crosslinking agent, and by compounding with ultrafine calcium carbonate, the high molecular plugging wall-protecting agent is obtained. By addition of the plugging agent provided by the embodiment into a drilling fluid containing bentonite slurry, API filter loss, high temperature and high pressure filter loss and invasion sand bed depth of the drilling fluid can be effectively reduced, so that plugging of the clay shale can be better realized, and the occurrence of downhole complicated conditions can be reduced.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a macromolecular plugging and retaining agent for drilling fluid and a preparation method thereof. Background technique [0002] Wellbore instability has always been a major problem in the petroleum industry. This problem exists in many oil fields in the world, and it has not been well resolved. More than 90% of wellbore instability occurs in shale formations. Wellbore instability not only affects drilling speed, logging and cementing quality, but also makes it impossible to drill to the target layer in some areas, affecting the realization of exploration goals. [0003] For shale formations with well-developed bedding and fissures, in order to prevent wellbore instability, the drilling fluid is required to have strong sealing properties, which can effectively seal formation bedding and fissures, prevent drilling fluid and its filtrate from entering the formation, and improve fo...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/03C08F220/56C08F220/58C08F4/40
CPCC08F4/40C08F220/56C09K8/03C08F220/585C08F222/385
Inventor 王建华刘进京苑旭波冯杰王立辉张绍云王发云高珊
Owner BC P INC CHINA NAT PETROLEUM CORP