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Water swelling and plugging material and preparation method thereof

A technology of water-absorbing swelling material and plugging material, which is applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of insufficient stability, reliability and practicality, low plugging strength, difficulty in removing plugging, etc., and achieves excellent sealing effect. Blocking effect, easy unblocking, excellent blocking effect

Inactive Publication Date: 2016-10-26
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the bridge plugging material has achieved good application results in the plugging process, it has technical problems such as low plugging strength, complicated construction, difficult plugging removal, and high cost, and is not stable, reliable and practical enough.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The invention is a water-absorbing expansion plugging material for drilling operations, and its raw material ratio is calculated according to the following mass percentages:

[0019] 40% water-absorbing swelling material; the water-absorbing swelling material is a polymer resin containing hydrophilic groups, specifically a mixture of polyacrylamide resin and polysaccharide resin, that is, 30% polyacrylamide resin and 10% polyacrylamide resin in the total mass of the plugging material. The mixture of % polysaccharide resin obtains 40% water-absorbing swelling material;

[0020] Cross-linking agent 10%; The cross-linking agent is adipaldehyde;

[0021] Inert material 50%; the inert material is a composite of rigid material-calcium carbonate and deformable material-asphalt, fiber material, that is, a composite of calcium carbonate, asphalt and fiber material, in the total mass of leakage material, 15% asphalt , 10% fiber material and 25% calcium carbonate are mixed to obt...

Embodiment 2

[0027] The invention is a water-absorbing expansion plugging material for drilling operations, and its raw material ratio is calculated according to the following mass percentages:

[0028] Water-absorbing swelling material 50%; the water-absorbing swelling material is a polymer resin containing hydrophilic groups, specifically a mixture of polyphenolic resin and urea-formaldehyde resin, that is, 20% polyphenolic resin and 30% urea-formaldehyde resin in the total weight of the plugging material The mixture can get 50% water-swellable material;

[0029] 15% cross-linking agent; the cross-linking agent is a mixture of ammonium chloride and petroleum sulfonic acid, that is, the mixture of 5% ammonium chloride and 10% petroleum sulfonic acid in the total mass of the plugging material gets 15% cross-linking agent;

[0030] Inert material 35%; the inert material is a composite of rigid material-calcium carbonate and deformable material-asphalt, fiber material, that is, a composite o...

Embodiment 3

[0036] The invention is a water-absorbing expansion plugging material for drilling operations, and its raw material ratio is calculated according to the following mass percentages:

[0037] Water-absorbing swelling material 60%; the water-absorbing swelling material is a polymer resin containing hydrophilic groups, specifically urea-formaldehyde resin;

[0038] 10% cross-linking agent; the cross-linking agent is a mixture of borax and ethyl sulfate, that is, the mixture of 5% borax and 5% ethyl sulfate in the total mass of the plugging material gets 10% cross-linking agent;

[0039] Inert material 30%; the inert material is a composite of rigid material-quartz sand and deformable material-asphalt, fiber material, that is, a composite of quartz sand, asphalt and fiber material, in the total mass of leaking materials, 5% asphalt , 10% fiber material and 15% quartz sand are mixed to obtain 30% inert material, in which asphalt is 50-100 mesh, fiber material is 200-300 mesh, and qu...

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Abstract

The invention discloses a water swelling and plugging material and a preparation method thereof. The plugging material is prepared from the following raw materials by mass percent: 30 to 60% of water swelling materials, 5 to 20% of crosslinking agents and 30 to 55% of inert materials. The preparation method comprises the following steps of (1) respectively preparing the raw materials according to the formula ratio; (2) uniformly mixing and stirring the raw materials of the step (1) at room temperature and under normal pressure, so as to obtain the water swelling and plugging material. The water swelling and plugging material can absorb water to swell in loss zones, so that under the dual action of filling and plugging as well as squeezing and compaction, the loss zones are stably, reliably and effectively plugged well; in addition, the water swelling and plugging material can be easily and conveniently arranged on a drilling site, the process is simple and easy to implement, and the cost is low; in addition, the performance of water-based drilling fluid cannot be influenced, and the unplugging can be easily and conveniently realized.

Description

technical field [0001] The invention relates to a plugging material for well drilling in oil and gas fields, in particular to a water-absorbing-swelling plugging material and a preparation method of the plugging material. Background technique [0002] With the rapid development of drilling and the increase in the complexity of drilling blocks, the frequency of lost circulation is getting higher and higher, and the problem of lost circulation is becoming more and more prominent. Lost circulation is the main technical bottleneck restricting the speed of exploration and development of oil and gas fields, which causes huge loss of drilling fluid, and the loss caused by reservoir leakage caused by reservoir damage is even more incalculable. Therefore, if the lost circulation problem can be better dealt with, the potential economic benefits are huge, and the plugging material is an indispensable material basis in the process of dealing with the lost circulation problem. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/426C09K8/887C09K8/905
Inventor 周成华胡德云杨国兴逯贵广王权阳袁俊秀朱魁李尧罗朝东张珍曾艺陈建君樊志刚王猛熊雪莲龚贵嵩
Owner 中石化石油工程技术服务有限公司
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