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Elastic plugging agent

A plugging agent and elastic technology, which is applied in the field of elastic plugging agent for drilling, can solve the problems of reducing drilling fluid fluid loss, etc., and achieve the effects of efficient and rapid plugging removal, long validity period and cost saving

Active Publication Date: 2015-04-29
东营市大用石油助剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the action of pressure difference, the elastic temporary plugging particles are squeezed into the wellbore fractures, relying on the external elastic gel to generate a large friction force. When multiple elastic temporary plugging particles enter the pores or fractures at the same time, the superposition of the friction force will be greater than the production capacity. Therefore, the elastic temporary plugging particles have good adaptability to well wall cracks with different entrance shapes, and their elastic variability overcomes the rigid solid particles that cannot be deformed. The disadvantage of poor adaptability can effectively reduce the fluid loss of drilling fluid and play the role of one-way plugging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0080] equipment used

[0081] (1) AR550 Elastic Particle Performance Measuring Instrument: Made by China University of Petroleum (East China);

[0082] (2) 180°C—30MPa plugging tester: manufactured by China University of Petroleum (East China). The preparation of embodiment 1 elastic plugging agent

[0083] Add 100g of quartz sand with a particle size of 40-50μm, 2000g of acrylamide monomer, 260g of benzoyl peroxide, 200g of sodium lauryl sulfate and 200g of polyacrylamide into water, raise the temperature to 60°C, and react for 3 hours. Dry to obtain elastic temporary plugging particles, and then add 300 g of polypropylene fibers with a size of 100 μm to the obtained elastic temporary plugging particles to obtain an elastic plugging agent; its performance parameters are shown in Table 1:

[0084] Table 1

[0085] project

[0086] Density g / cm 3

Embodiment 2

[0088] Add 100g of walnut shell powder with a particle size of 20-30μm, 600g of acrylamide monomer, 60g of lauroyl peroxide, 30g of methyl pentanol and 250g of polyvinyl alcohol into water, raise the temperature to 70°C, react for 3 hours, and dry to obtain Elastic temporary plugging particles, and then add 300g of polyester fiber with a size of 500 μm to the prepared elastic temporary plugging particles to obtain an elastic plugging agent; its performance parameters are shown in Table 2:

[0089] Table 2

[0090] project

Embodiment 3

[0092] Add 100g of quartz sand with a particle size of 400-410μm, 1000g of acrylamide monomer, 100g of tert-butyl peroxyvaleric acid tert-butyl, 250g of sodium lauryl sulfate and 550g of xanthan gum into the water, heat up to 85°C, Reaction for 3 hours, drying to obtain elastic temporary plugging particles, and then adding 3000g of polyester fiber with a size of 1000 μm to the obtained elastic temporary plugging particles to obtain elastic plugging agent; its performance parameters are shown in Table 3:

[0093] table 3

[0094] project

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Abstract

The invention relates to an elastic plugging agent which comprises the following components in parts by weight: 1 part of elastic temporary plugging particles and 0.1-10 parts of a bridging agent, wherein the elastic temporary plugging particles are prepared in such a way that a monomer, an initiating agent, a dispersing agent, rigid solid particles and elastic gel are added into water, stirred uniformly, heated to 60-150 DEG C, and dried after reaction is finished. The elastic plugging agent provided by the invention plays a unidirectional plugging effect, and has favorable adaptability to holes with inlets in different shapes owing to the characteristic of variable elasticity.

Description

technical field [0001] The invention relates to the technical field of well drilling, in particular to an elastic lost circulation agent for well drilling. Background technique [0002] With the continuous growth of the world's oil and gas demand, the exploration and development of complex oil and gas reservoirs by using the protection drilling fluid technology is increasing year by year. Lost circulation occurs from time to time due to weak natural formation structure or unreasonable water injection development. [0003] Lost circulation refers to the phenomenon that drilling fluid or other media (such as cementing slurry, etc.) in the wellbore leak into the formation pores, fractures and other spaces during the drilling process. Lost circulation is a common complex situation in wells in drilling engineering. Most drilling processes have different degrees of lost circulation. Slight lost circulation will interrupt drilling work, and serious lost circulation will consume a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/426C09K2208/04C09K2208/18
Inventor 杨小平韩阳
Owner 东营市大用石油助剂有限责任公司
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