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High efficient plugging agent for well drilling

A plugging agent, high-efficiency technology, applied in the field of plugging agent, can solve the problems of limited plugging ability, difficult to control the size, poor plugging effect, etc., to achieve wide plugging coverage, high pressure bearing capacity, plugging good effect

Inactive Publication Date: 2013-01-09
浙江仁智股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When plugging directly with plant fibers such as cottonseed hulls, due to the inherent characteristics of these fibers: too light specific gravity, difficult to control size, easy to knot, poor fluidity and other factors, the plugging effect is poor during use and the pressure bearing capacity is weak; while particles or The plugging ability of powdery plugging agent for large cracks has limitations; when using bridging plugging agent, there are phenomena of "door sealing" (the plugging agent cannot enter the leaky layer) and "regurgitation" (leakage after plugging)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: 15% of walnut shells of 5-7 meshes, 10% of walnut shells of 9-12 meshes, 10% of sawn wood surface less than 1 mm, 20% of active sealing agent, 10% of cottonseed shells of less than 1 cm, 5 15% of ~7 mesh elastic rubber particles, 5% of 8~12 mesh elastic rubber particles, and 15% of chaff less than 2 mm are mixed evenly, then added to the field mud and mixed evenly, and the seam plate with a seam width of 2~4mm is sealed . Among them, HFD-1 is used as the active plugging agent, and its component weight ratio is 20% of sulfonated asphalt, 30% of plant fiber powder, and 50% of 100-400 mesh calcium carbonate.

[0019] The experimental results show that the high-efficiency plugging agent for drilling can effectively seal the fractures with a fracture width of 2-4mm. Above 6Mpa.

Embodiment 2

[0020] Example 2: 20% of 2-3 mesh walnut shells; 10% of sawn wood surface below 5 mesh; 25% of active plugging agent; 10% of cottonseed shells less than 1 cm; 20% of 2-3 mesh elastic rubber particles; 2 mm of chaff 15%. After mixing evenly, add it to the field mud and mix evenly, and conduct a plugging experiment on the slit plate with a slit width of 4~6mm.

[0021] The experimental results show that the high-efficiency plugging agent for drilling can effectively seal the fractures with a fracture width of 4-6mm, the cementation at the fracture opening is dense, and the leakage loss during the plugging process is very small, which can quickly plug the fractures and withstand pressure up to Above 6Mpa.

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PUM

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Abstract

The invention relates to a plugging agent during well drilling in oil and gas field, and particularly to a high efficient plugging agent for severe lost circulation. The components are, by weight: 18-25% of walnut shell powder, 8-10% of sawdust, 8-10% of cottonseeds, 10-15% of hull powder, 20-30% of active plugging agents, and 15-25% of elastic rubber granules, and the raw materials are mixed uniformly to obtain a high efficient plugging agent for well drilling. According to the invention, the fibrous plugging agent with granules is formed by mixing natural plant inert materials, a synergistic agent, and a reinforcing agent with a certain preparation ratio. The plugging agent of the invention has the advantages of wide covering area for leak stopping, high pressure bearing capacity, good plugging effect, high success rate for disposable leak stopping, simple on-site preparation process, and reliable and safe construction, which can achieve the purposes of reducing loss of lost circulation and saving comprehensive cost. The high efficient plugging agent of the invention is applicable to leak stopping operations under various lost circulation conditions with good leak stopping effect and high success rate, and is superior to other types of plugging agents.

Description

technical field [0001] The invention relates to a lost circulation agent in the drilling process of oil and gas fields, in particular to a highly efficient lost circulation agent for vicious lost circulation. Background technique [0002] Lost circulation is one of the factors that have the greatest impact on drilling speed and drilling cost in various complex situations, and it is a difficult problem that plagues oil and gas drilling. Once lost circulation occurs, it not only needs to consume a large amount of drilling fluid materials and plugging materials, but also prolongs the engineering time, increases the cost of development, and even causes downhole accidents such as stuck drill, buried drill and scrapped the whole well. At present, there are many plugging agents with different characteristics in the domestic market, some of which are plant fiber plugging agents mainly composed of cotton fibers, peanut shells, walnut shells and other plant fibers; some are mainly com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
Inventor 张军张敬荣李智斌彭商平李艳吕宝温银武于志纲
Owner 浙江仁智股份有限公司
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