Drilling fluid plugging agent while drilling

A technology of plugging while drilling and drilling fluid, applied in the directions of reagents, drilling compositions, chemical instruments and methods, etc., can solve the problems of increasing the occurrence of downhole accidents, reducing drilling speed, running slurry, etc., and improving fracture expansion resistance. , Improve the wellbore fracture pressure, the effect of small influence on rheology

Active Publication Date: 2010-06-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of its additives are inert particles. This kind of treatment agent is cheap, but the amount of addition is large. Some additive components such as peach shell, sawdust, cottonseed shell, bagasse, asbestos, fiber, etc., are added to high-density drilling fluid , although it also has the function of plugging while drilling, but because of the large amount of product added, the viscosity of the drilling fluid system is significantly increased, and the friction coefficient of the drilling fluid is also increased, and the vibrating screen cannot be used during use, otherwise it will The phenomenon of mud running increases the drilling cost, reduces the drilling speed, and increases the probability of downhole accidents. Therefore, the existing physical lost circulation agents are not suitable for application under high-density conditions.
[0009] Chemical plugging technology mainly achieves the purpose of plugging th

Method used

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  • Drilling fluid plugging agent while drilling
  • Drilling fluid plugging agent while drilling
  • Drilling fluid plugging agent while drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add an appropriate amount of sodium hydroxide to 30 grams of 10% acrylic acid solution for neutralization to make a sodium acrylate solution, add 10 grams of acrylamide, 12 grams of 2-acrylamide-2-methylpropanesulfonic acid, 5 grams of Anqiu bentonite and 10 grams of water, after mixing evenly, fill with nitrogen for 20 minutes,

[0037] To drive away dissolved oxygen, 0.05 g of potassium persulfate, 0.05 g of sodium bisulfite, and 0.05 g of methylenebisacrylamide were added at room temperature to initiate the reaction. After the reaction product is dried, it is granulated, pulverized and sieved through a 100-mesh sieve to obtain a product with a water absorption ratio of 20.

[0038] Note the test method of water absorption multiple

[0039] Accurately weigh a sample of a certain quality, place it in a 500ml beaker, add 400ml of water-absorbing medium, and stir thoroughly. After the sample absorbs water and swells constant (the time is greater than 24h), filter it wit...

Embodiment 2

[0045] Add an appropriate amount of sodium hydroxide to 30 grams of 10% acrylic acid solution for neutralization to make a sodium acrylate solution, add 10 grams of acrylammonium, 10 grams of dimethyl diallyl ammonium chloride, 5 grams of Anqiu bentonite and 10 grams of water, after mixing evenly, fill with nitrogen for 20 minutes to drive away dissolved oxygen, add 0.05 grams of potassium persulfate, 0.05 grams of sodium bisulfite, and 0.05 grams of methylenebisacrylamide at room temperature to initiate the reaction . After the reaction product is dried, it is granulated, pulverized and sieved through a 100-mesh sieve to obtain a product with a water absorption ratio of 38.

Embodiment 3

[0047] Take 60 parts of dried and pulverized corncobs passing through 80 meshes, 5 parts by weight of the weakly gelled polymer of Example 1, 20 parts by weight of asphalt raw powder (140°C), and 15 parts by weight of graphite in a mixer and mix them evenly.

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Abstract

The invention relates to a drilling fluid plugging agent while drilling, comprising 60-100 parts of plant fibers, 5-20 parts of asphalt, 5-15 parts of graphite and 5-20 parts of weak water absorbent gel by weight. The weak water absorbent gel is a polymer which has mean grain size of 200-20 meshes and water absorbent multiple of 10-100g.g-1 and is prepared by reacting 20-60 parts of monomer, 0.05-1.0 part of potassium peroxydisulfate, 0.05-1.0 part of sodium bisulfite, 0.005-0.5 part of methylene-bis-acrylamide and 2-10 parts of inorganic fillers by weight under constant temperature of 20-60 DEG C for 8-12h by way of aqueous solution polymerization, drying and pelleting, wherein the polymeric monomer is one or more of acrylamide, acrylic acid, dimethyl diallyl ammonium chloride and 2-acrylamide-2-methyl propanesulfonic acid. The plugging agent has little effect on the rheological property of the drilling fluid, can reduce the API filtration and the coefficient of friction resistance of the drilling fluid in an auxiliary manner and is suitable for controlling leakage of and plugging the windows with high density and narrow pressure.

Description

Technical field: [0001] The invention relates to a drilling fluid plugging agent while drilling. In particular, it relates to a plugging agent for drilling while drilling under the conditions of high temperature, high density and narrow pressure window. It has dual effects of leak prevention and plugging. Background technique: [0002] Lost circulation is a problem often encountered in the drilling process. Lost circulation not only consumes drilling time and loses drilling fluid, but also can cause a series of complicated situations such as pipe sticking, blowout, and well collapse. It even leads to the scrapping of the wellbore and great economic losses. [0003] Lost circulation is the result of the combined action of subjective and objective factors. The existence of formation voids and fractures is the objective condition for lost circulation. However, in some deep wells and complex well sections, the excessively high drilling fluid density will induce and aggravat...

Claims

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Application Information

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IPC IPC(8): C09K8/42
CPCY02P20/141
Inventor 李辉肖红章何涛张睿达何刚
Owner PETROCHINA CO LTD
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