Anti-sloughing drilling fluid as well as preparation method and application thereof

A drilling fluid, plugging and anti-collapse technology, which is applied in the field of petroleum drilling, can solve problems that affect the safety of downhole drilling, complex jamming, and stratum collapse, and achieve the effect of reducing poor drilling, reducing jamming, and unobstructed wellbore

Active Publication Date: 2021-11-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem existing in the prior art that when drilling a fractured carbonate rock stratum, the stratum is prone to collapse and block loss, resulting in abnormal torque and complex situations of jamming, which seriously affect the safety of downhole drilling. The present invention proposes a anti-slump drilling fluid

Method used

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  • Anti-sloughing drilling fluid as well as preparation method and application thereof
  • Anti-sloughing drilling fluid as well as preparation method and application thereof
  • Anti-sloughing drilling fluid as well as preparation method and application thereof

Examples

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Embodiment 1

[0057] This example relates to an anti-slump drilling fluid suitable for safe drilling in fractured carbonate formations. The components are calculated in parts by weight, including 1000 parts of water, 30 parts of sodium bentonite, and 4 parts of polymer fluid loss control. Agent PAC-L V (Zhengzhou Dongfang Auxiliary Co., Ltd.), 30 parts of lignite resin SPNH (Kunming Jinsida Chemical Co., Ltd.), 30 parts of sulfomethyl phenolic resin SMP-2 for drilling fluid (Zhengzhou Dongfang Auxiliary Co., Ltd.), 5 parts NaOH, 20 parts of superfine calcium carbonate, 15 parts of SMNP-1 (particle size is 0.1 ~ 10 μm, Sinopec Petroleum Engineering Technology Research Institute), 20 parts of SM-Shield-2 (Sinopec Petroleum Engineering Technology Research Institute), 20 parts SMNA-1, 20 copies of SMCG-2 (Sinopec Petroleum Engineering Institute), 4 copies of SMTQ-1 (Sinopec Petroleum Engineering Technology Institute), 3 copies of FA367 (Jinan Haofeng Chemical Co., Ltd.), 30 copies of SMJH-1 (Chi...

Embodiment 2

[0063] This example relates to an anti-slump drilling fluid suitable for safe drilling in fractured carbonate rock formations. The components include 1000 parts by weight of water, 25 parts of sodium bentonite, and 6 parts of SMPFL-L (China Petrochemical Petroleum Engineering Technology Research Institute), 30 parts of SPNH, 30 parts of SMP-2, 6 parts of NaOH, 25 parts of ultrafine calcium carbonate, 15 parts of SMNP-1, 20 parts of SMLS-1 (Sinopec Petroleum Engineering Technology Research Institute), 20 parts of SMNA-1, 25 parts of SMCG-2, 3 parts of SMTQ-1, 3 parts of FA367, 30 parts of SMJH-1, 630 parts of barite. The superfine calcium carbonate particle size is mixed in three equal weight ratios of 500 mesh, 800 mesh and 2500 mesh. All components are commercially available products.

[0064] The specific preparation method of this example is: first dissolve 25 parts of sodium bentonite in 1000 parts of water, stir at 500r / min for 24 hours to fully hydrate, and after hydrat...

Embodiment 3

[0069] This example relates to an anti-slump drilling fluid suitable for safe drilling in fractured carbonate formations. The components include 1000 parts of water, 15 parts of sodium bentonite, 6 parts of SMPFL-L, and 35 parts by weight. Parts SPNH, 35 parts SMP-2, 6 parts NaOH, 30 parts superfine calcium carbonate, 10 parts SMNP-1, 20 parts SMNA-1, 20 parts SMLS-1, 25 parts SMCG-2, 4 parts SMTQ-1, 3 parts of KPAM, 30 parts of SMJH-1, 1300 parts of barite. The superfine calcium carbonate particle size is mixed by equal weight ratio of 800 mesh and 2500 mesh. All components are commercially available products.

[0070] The specific preparation method of this example is: first dissolve 15 parts of sodium bentonite in 1000 parts of water, stir at 500r / min for 24 hours to fully hydrate, and after hydration, add 6 parts of SMPFL-L to the soil slurry under the condition of 8000r / min Fully dissolved in the medium, followed by 35 parts of SPNH, 35 parts of SMP-2, 6 parts of NaOH, ...

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Abstract

The invention relates to an anti-sloughing drilling fluid for a fractured carbonate rock stratum and a preparation method and application of the anti-sloughing drilling fluid in the field of petroleum drilling. The anti-sloughing drilling fluid can be prepared from the following components in parts by weight: 1000 parts by weight of water, 15 to 40 parts by weight of drilling fluid bentonite, 5 to 35 parts by weight of a micro-nano blocking agent, 20 to 70 parts by weight of a temperature-sensitive blocking anti-collapse agent, 15 to 30 parts by weight of graphene hydrogel and 0 to 1600 parts by weight of an inert weighting agent. The anti-sloughing drilling fluid disclosed by the invention has high anti-sloughing performance, rheological property, temperature resistance and lubricating property, can effectively reduce the well wall instability risk of a fractured carbonate rock stratum, reduce bit bouncing and blocking and ensure underground safe construction, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of petroleum drilling, and more particularly relates to an anti-slump drilling fluid and a preparation method and application thereof. Background technique [0002] Since 2007, important breakthroughs have been made in the exploration and development of carbonate formations in the marine Leikoupo Formation in western Sichuan, with a total resource potential of 300-500 billion cubic meters of proven reserves. However, the marine Leikou slope formation in western Sichuan is broken, the formation is poorly cemented, the bedding and fractures are developed, the wellbore instability is prominent, and complex situations such as resistance, stuck pipe, and leakage occur frequently during drilling and coring, which seriously threaten the Downhole safety. According to statistics, a total of 13 stuck pipes occurred in 6 wells that have been drilled in the early stage, and the total loss time due to complex aging is about 230 d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/18C09K8/035C09K8/508
CPCC09K8/18C09K8/035C09K8/508
Inventor 高书阳金军斌柴龙宋兆辉宋碧涛甄剑武王显光陈晓飞
Owner CHINA PETROLEUM & CHEM CORP
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