Strong-inhibition high-blocking-performance double-protection drilling fluid, preparation method thereof and drilling composition

A strong suppression and drilling fluid technology, applied in the field of drilling fluid, can solve the problems of poor suppression and poor plugging effect, and achieve the effects of low cost, improved drilling efficiency and improved flow pattern

Inactive Publication Date: 2019-05-31
PETROLEUM ENG TECH RES INST CHINA PETROLEUM & CHEM CORP NORTH CHINA OIL & GAS CO +1
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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 provide a double-guaranteed drilling fluid with strong inhibition and high plugging, so as to solve the problems of poor inhibition and poor plugging effect when the existing drilling fluid encounters broken mudstone formations

Method used

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  • Strong-inhibition high-blocking-performance double-protection drilling fluid, preparation method thereof and drilling composition
  • Strong-inhibition high-blocking-performance double-protection drilling fluid, preparation method thereof and drilling composition
  • Strong-inhibition high-blocking-performance double-protection drilling fluid, preparation method thereof and drilling composition

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Embodiment 1

[0033] The strong-inhibition, high-plugging and dual-protection drilling fluid of this embodiment is composed of water and a drilling composition, and the specific parts by weight are: 100 parts of water, 0.15 parts of soda ash, 3 parts of bentonite, 0.5 parts of polyacrylamide potassium salt, polyacrylamide 0.4 parts of anionic cellulose, 2 parts of pregelatinized starch, 2 parts of emulsified paraffin, 3 parts of plugging agent, 0.05 parts of xanthan gum, 0.2 parts of sodium hydroxide, and 2 parts of cuttings. Cuttings are made of mudstone cuttings encountered in the same layer drilled by adjacent wells, dried at 120°C and crushed, with a particle size of 80-100 mesh.

[0034] The preparation method of the strong inhibition and high plugging double protection type drilling fluid in this embodiment adopts the following steps:

[0035] 1) Take 1000g of distilled water, add 1.5g of soda ash and 30g of sodium bentonite in sequence, stir at 400r / min for 10h, seal it, and let it sta...

Embodiment 2

[0038] The strong inhibition and high plugging dual protection drilling fluid of this embodiment is composed of water and drilling composition, and the specific parts by weight are: 100 parts of water, 0.15 parts of soda ash, 3 parts of bentonite, 0.4 parts of polyacrylamide potassium salt, polyacrylamide 0.3 parts of anionic cellulose, 1.5 parts of pregelatinized starch, 1.5 parts of emulsified paraffin, 2 parts of plugging agent, 0.04 parts of xanthan gum, 0.2 parts of sodium hydroxide, 2 parts of superfine calcium carbonate, and 1.5 parts of cuttings. Cuttings are made of mudstone cuttings encountered in the same layer drilled by adjacent wells, dried at 120°C and crushed, with a particle size of 80-100 mesh.

[0039] The preparation method of the strong inhibition and high plugging double protection type drilling fluid in this embodiment adopts the following steps:

[0040] 1) Take 1000g of distilled water, add 1.5g of soda ash and 30g of sodium bentonite in sequence, stir...

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Abstract

The invention relates to strong-inhibition high-blocking-performance double-protection drilling fluid, a preparation method thereof and a drilling composition. The drilling fluid is mainly composed of, by weight, 2-3 parts of bentonite, 0.3-0.5 part of polyacrylamide potassium salt, 0.2-0.4 part of polyanionic cellulose, 2-3 parts of pre-gelatinized starch, 2-3 parts of emulsified paraffin, 2-3 parts of blocking agent, 0.04-0.06 part of xanthan gum, 0.1-0.3 part of pH regulator, 0-2 parts of weighting agent and 1-2 parts of rock debris. The drilling fluid is mainly compounded by water, the polyacrylamide potassium salt, polyanionic cellulose, the pre-gelatinized starch, emulsified paraffin, the blocking agent, the xanthan gum and the rock debris; the raw materials present good inhibiting performance and blocking performance on fractured mudstone strata at low using amount, so that the drilling fluid can effectively avoid accidents like well leakage and well collapse, and safety and success rate of drilling construction are improved.

Description

technical field [0001] The invention belongs to the field of drilling fluids, and in particular relates to a strong-inhibiting, high-blocking, double-protected drilling fluid, a preparation method thereof, and a drilling composition. Background technique [0002] Drilling broken mudstone during drilling can easily lead to complex situations such as well lost circulation and well collapse. It is difficult to deal with and takes a long time to deal with. It is the most common and most difficult to solve completely in drilling engineering. Once leakage occurs in the wellbore of the broken mudstone, it is very difficult to plug the leak, and the free water in the mud enters the formation, and the mudstone absorbs water and expands while being crushed by stress, which greatly increases the risk of wellbore instability. The above-mentioned complex situation will delay the drilling operation time, prolong the drilling cycle, and cause huge economic losses, and the solid phase parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
Inventor 冯永超王翔陈晓华王智洪张永清牛似成张辉张翔
Owner PETROLEUM ENG TECH RES INST CHINA PETROLEUM & CHEM CORP NORTH CHINA OIL & GAS CO
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