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Modified plant fiber plugging-while-drilling agent for drilling fluid and preparation method of plugging-while-drilling agent

A technology of plant fiber and plugging while drilling, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of high cost, complicated production of plugging agent while drilling, poor plugging effect, etc., and achieve low cost , Small change in dynamic shear force, small effect

Inactive Publication Date: 2020-10-16
DAQING HEZHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the problems of complicated production, high cost and poor plugging effect of the existing LWD in the background technology, and provide a modified plant fiber LWD for drilling fluid , the drilling fluid uses modified plant fiber LWD plugging agent, which has low cost, small dosage, remarkable plugging effect, and does not affect the performance of drilling fluid

Method used

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  • Modified plant fiber plugging-while-drilling agent for drilling fluid and preparation method of plugging-while-drilling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 95g of water, add 5g of hydrolyzed polyacrylonitrile ammonium salt, stir at 20°C-60°C to fully dissolve the ammonium salt, adjust the pH value to less than 6 with 10% hydrochloric acid, and continue stirring for 20 minutes to obtain a viscous liquid for use .

Embodiment 2

[0031] Install a heating mantle, a stirrer and a condenser in a 500m three-necked bottle, add 300mL of water and 5g of sodium hydroxide into the there-necked bottle, and put 30g of acrylic waste silk into the three-necked bottle after chopping.

[0032] Gradually heat up to 90°C-100°C while stirring, and open the condenser to reflux at the same time. When the acrylic fiber is completely dissolved and forms a white or yellow viscous liquid, measure its apparent viscosity. When the apparent viscosity is less than 15mPa.s, Stop responding.

[0033] Cool the reaction solution below 60°C, adjust the pH value to less than 6 with 10% hydrochloric acid, add 5.0g aluminum trichloride hexahydrate (ALCL 3 ·6H 2 (0), stirring makes aluminum chloride dissolve and forms viscous liquid, continues to stir 20 minutes, must stand-by viscous liquid.

Embodiment 3

[0035] According to embodiment 2, before adjusting pH, add 10g bentonite, after pH value is adjusted to be less than 6, add 5.0g aluminum trichloride hexahydrate (ALCL 3 ·6H 2 O), must stand-by viscous liquid.

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Abstract

The invention relates to a plugging-while-drilling agent for drilling fluid and a preparation method of the plugging-while-drilling agent, in particular to a preparation method of a modified plant fiber plugging agent. The plugging-while-drilling agent is prepared from the following components in percentage by weight: 40 to 80 percent of plant fiber, 10 to 40 percent of humic acid and 5 to 10 percent of hydrolyzed polyacrylonitrile colloid, wherein the hydrolyzed polyacrylonitrile colloid is floccule obtained by cross-linking hydrolyzed polyacrylonitrile salt. The preparation method of the modified plant fiber plugging-while-drilling agent comprises the following steps: adding the prepared hydrolyzed polyacrylonitrile salt cross-linked floccule solution into a mixture of plant fiber and humic acid according to a corresponding ratio, fully and uniformly mixing, drying into a solid, and grinding into powder, thereby obtaining the modified plant fiber plugging-while-drilling agent. The plugging-while-drilling agent has little influence on the performance of the drilling fluid, can effectively plug stratum micro-cracks and high-permeability pore leakage, and has the advantages of accessible raw materials, low cost, simple production technique and favorable popularization and application values.

Description

Technical field: [0001] The invention relates to the technical field of oil field exploration and drilling, in particular to a modified plant fiber plugging agent for drilling fluid and a preparation method thereof Background technique: [0002] During oil and gas drilling, lost circulation often occurs due to natural pores and fractures in the formation, high drilling fluid density, liquid column pressure greater than formation pore and fracture pressure, and man-made fractures. [0003] Well leakage is extremely dangerous. First of all, normal circulation cannot be established, cuttings cannot be carried out of the wellbore, and drilling cannot continue, which affects the drilling speed; it may also cause a series of complications such as drill sticking, well bed, and blowout. Therefore, lost circulation must be prevented and stopped. [0004] Lost circulation can also cause damage to oil and gas layers. When oil and gas layers are drilled, fine particles in the drilling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/46
CPCC09K8/03C09K8/46C09K8/426C09K2208/08C09K2208/18
Inventor 张磊胥勇
Owner DAQING HEZHENG CHEM
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