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Low-solid ultra-high temperature water-based drilling fluid and preparation method thereof

A water-based drilling fluid, ultra-high temperature technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unstable drilling fluid performance, high solid content, poor rock-carrying ability, etc.

Active Publication Date: 2021-01-26
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a low-solid ultra-high-temperature water-based drilling fluid that solves the problems of unstable drilling fluid performance, poor rock-carrying ability, and high solid content in deep and ultra-deep well ultra-high temperature environments.

Method used

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  • Low-solid ultra-high temperature water-based drilling fluid and preparation method thereof
  • Low-solid ultra-high temperature water-based drilling fluid and preparation method thereof
  • Low-solid ultra-high temperature water-based drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Low-solid ultra-high temperature water-based drilling fluid product I:

[0036]First measure 400mL solvent water, add 3g bentonite and 0.15g anhydrous sodium carbonate while stirring, stir at low speed for 20min, and maintain at room temperature for 24h to make prehydrated bentonite slurry; then put the prehydrated bentonite slurry on the high mixer , under high-speed 11000r / min electric stirring, add 4g PAC-LV, 4g PAC-HV and 0.8g FA-367 in turn, stir for 20min and then add 2g CMS, 6g DS-143, 2g Redu-1, 4g Driscal D, Continue to stir for 20 minutes, then add 10g SMPC-Ⅲ, 10g DYFT-II, 8g HE-300 and 60 grams of superfine calcium carbonate, stir for 20 minutes after the addition, and then hydrate at room temperature for 24 hours to obtain the low solid phase ultra-high temperature water base Drilling fluid with a density of 1.10g / cm 3 .

Embodiment 2

[0038] Low-solid ultra-high temperature water-based drilling fluid II:

[0039] First measure 400mL of solvent water, add 4g of bentonite and 0.2g of anhydrous sodium carbonate while stirring, stir at low speed for 20min, and maintain at room temperature for 24h to make prehydrated bentonite slurry; then put the prehydrated bentonite slurry into the high mixer , under high-speed 11000r / min electric stirring, add 4g PAC-LV, 2g PAC-HV and 1.2g FA-367 in turn, stir for 20min and then add 2g NPAN, 4g DS-143, 2g DSP-2, 3.2g Driscal D , continue to stir for 20 minutes, then add 8g SMP-3, 8gFF-I, 6g SDZJ and 102 grams of superfine calcium carbonate, stir for 20 minutes after the addition, and then hydrate at room temperature for 24 hours to obtain the low-solid ultra-high temperature water-based drilling Liquid, its density is 1.15g / cm 3 .

Embodiment 3

[0041] Low-solid ultra-high temperature water-based drilling fluid product III:

[0042] First measure 400mL of solvent water, add 4g of bentonite and 0.2g of anhydrous sodium carbonate while stirring, stir at low speed for 20min, and maintain at room temperature for 24h to make prehydrated bentonite slurry; then put the prehydrated bentonite slurry into the high mixer , under high-speed 11000r / min electric stirring, add 4g PAC-LV, 2.8g PAC-HV, 0.8g FA-367 in turn, stir for 20min, then add 2g NPAN, 6g SO-1, 2g Redu-1, 8g Driscal D , continue to stir for 20 minutes, then add 8g SMP-Ⅲ, 8g Soltex, 6gPZX-1 and 140 grams of superfine calcium carbonate, stir for 20 minutes after the addition, and then hydrate for 24 hours to obtain the low-solid ultra-high temperature water-based drilling fluid , whose density is 1.2g / cm 3 .

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Abstract

The invention discloses a low-solid phase ultrahigh-temperature water-based drilling fluid which is prepared from the following components in parts by weight: 100 parts of solvent water, 3-4 parts ofbentonite, 1.8-2.2 parts of a coating inhibitor, 2.3-3.5 parts of a filtrate reducer, 2-2.5 parts of high-temperature resistant resin, 2-2.5 parts of a shale inhibitor, 1.5-2 parts of a stripping agent and 15-35 parts of ultrafine calcium carbonate. The preparation method is simple. The preparation method comprises the following steps: adding a certain amount of bentonite into the solvent water toprepare prehydrated bentonite slurry; then successively adding the coating inhibitor, the filtrate reducer, the high-temperature resistant resin, the shale inhibitor, the stripping agent and ultrafine calcium carbonate while performing high-speed electric stirring; and finally, carrying out hydration at room temperature for 24 hours to prepare the low-solid phase ultrahigh-temperature water-baseddrilling fluid. The low-solid phase ultrahigh-temperature water-based drilling fluid can resist a temperature high up to220 DEG C, the low-solid phase ultrahigh-temperature water-based drilling fluidis good in rheological property, rock carrying property and high in blocking inhibiting property, the problem of low density carrying stability is solved, the low-solid phase ultrahigh-temperature water-based drilling fluid is successfully applied in mounting and probing a 4X well, and a good field application effect is obtained.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oil and gas fields, in particular to a low-solid ultrahigh-temperature water-based drilling fluid and a preparation method thereof. Background technique [0002] With the development of exploration and development to deep formations, the number of deep wells and ultra-deep wells is increasing, and the bottom hole temperature is getting higher and higher, which brings great challenges to the drilling fluid technology. The original drilling fluid treatment agent And the system can not fully meet the requirements of the development of ultra-high temperature drilling fluid technology. Although oil-based drilling fluid has the advantages of high temperature resistance, good lubricity, and stability of the well wall, it also has the problems of serious pollution and high cost, and has a large safety risk, while water-based drilling fluid is low in cost. , There are many types of treatmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C09K8/514
CPCC09K8/24C09K8/426C09K8/514
Inventor 田惠郝惠军左凤江喻化民张宇黄峰
Owner CNPC BOHAI DRILLING ENG
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