High-plugging-performance drilling fluid composition and preparation method and application thereof

A technology of drilling fluid and composition, which is applied in the field of strong plugging drilling fluid composition and its preparation, and can solve problems such as wellbore collapse and instability, unsatisfactory effect of shale micro-nano fractures, etc.

Active Publication Date: 2019-09-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems in the prior art about the wall collapse and instability of the long-displacement horizontal section of a shale deep well drilled with water-based drilling fluid and the unsatisfactory effect of using conventional plugging materials to plug micro-nano fractures in shale

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  • High-plugging-performance drilling fluid composition and preparation method and application thereof
  • High-plugging-performance drilling fluid composition and preparation method and application thereof

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preparation example Construction

[0026] According to the present invention, the preparation method of described nano plugging agent comprises the following steps:

[0027] (1) dispersing the graphene nanometer in a solvent to obtain a dispersion;

[0028] (2) dispersing polyethylene glycol in the dispersion liquid for surface modification;

[0029] (3) The product obtained in (2) is washed with water, separated and dried.

[0030] According to the present invention, the particle size distribution of the nano plugging agent is 30-80nm, preferably 40-75nm, more preferably 43.5-69.7nm. In addition, the strength of the nano-blocking agent prepared by the present invention is relatively high, without biological toxicity, and it is mainly used to fill the pore space between large particles and meet the requirements of an environmentally friendly drilling fluid treatment agent; in addition, it should be noted that in the present invention In , the particle size distribution can be understood as the distribution in...

preparation example 1

[0062] This preparation example is to illustrate the preparation method of the nano plugging agent of the present invention.

[0063] Take 1g of nano-graphene material in 100mL of water and stir at a high speed under the condition of magnetic stirring rate of 900r / min. After the dispersion is uniform, take 3g of polyethylene glycol and add graphite under the condition of 60°C and magnetic stirring rate of 900r / min. The mixture was stirred continuously for 3 hours for surface modification, washed with water three times, centrifuged at 3000r / min, and baked at 60°C for 8 hours to obtain a nano-blocking agent.

[0064] Results The prepared nano-blocking agent was black powdery particles, insoluble in water, with an average particle size of 43.5nm.

preparation example 2

[0066] This preparation example is to illustrate the preparation method of the nano plugging agent of the present invention.

[0067] Take 2g of nano-graphene material in 100mL of water and stir it at a high speed under the condition of magnetic stirring rate of 800r / min. Surface modification was carried out by continuous stirring for 4 hours in the olefin solution, the mixed solution was washed with water 4 times, centrifuged at a speed of 4000r / min, and dried at 70°C for 10 hours to obtain a nano-blocking agent.

[0068] Results The prepared nano-blocking agent was black powdery particles, insoluble in water, with an average particle size of 57.6nm.

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Abstract

The invention relates to the field of drilling fluid, and discloses a high-plugging-performance drilling fluid composition and a preparation method and application thereof. The high-plugging-performance drilling fluid composition contains water, bentonite, Na2CO3, a shale inhibitor, a filtrate loss reducer, a viscosity reducer, an anti-collapse agent, a nanometer plugging agent, a lubricant and aweighting agent, wherein the shale inhibitor is modified asphalt GLA, the anti-collapse agent is calcium carbonate superfine powder C80, and the nanometer plugging agent is nanometer graphene subjected to surface modification by polyethylene glycol. According to the high-plugging-performance drilling fluid composition, the modified asphalt GLA as the shale inhibitor, the calcium carbonate superfine powder C80 as the anti-collapse agent and the nanometer plugging agent are adopted for effectively plugging micro-nano cracks of the shale stratum of the large-displacement horizontal segment of a deep well, a drilling fluid phase is prevented from entering the cracks, the lasting and compact plugging barrier is formed near the well wall, and therefore pore pressure transmission is further prevented, the wedge effect of waterpower is further reduced, the block shedding phenomenon is avoided, collapsing of the stratum is effectively prevented, and the stratum is kept stable.

Description

technical field [0001] The invention relates to the field of drilling fluids, in particular to a strong plugging drilling fluid composition, a preparation method and an application thereof. Background technique [0002] Shale formations are hard and brittle formations with well-developed micropores and fractures and strong water sensitivity. During the drilling of deep extended-reach horizontal wells and cluster horizontal wells, wellbore instability accidents such as well collapse and shrinkage are very prone to occur. Although oil-based drilling fluid is beneficial to maintain wellbore stability and maximize reservoir protection, it is widely used in shale gas horizontal well drilling. The construction tools, plugging materials and other technologies are still immature, which seriously limits its large-scale application. However, the use of traditional water-based drilling fluids is not capable of sealing heterogeneous micro-nano pores and fractures in shale formations, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/508C01B32/194
CPCC09K8/03C09K8/5086C01B32/194C09K2208/10C09K2208/12C09K2208/18C09K2208/34C09K8/14C09K8/5045C09K8/506C09K8/426C09K8/24C09K8/16
Inventor 白杨李成李国军程焱张昊蒋官澄孙金声刘敬平
Owner SOUTHWEST PETROLEUM UNIV
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