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Unconsolidated sandstone reservoir protection drilling fluid and preparation method thereof

A reservoir protection and drilling fluid technology, applied in the field of loose sandstone reservoir protection drilling fluid and its preparation, can solve problems such as increasing difficulty, and achieve the effects of reducing drilling tool corrosion, avoiding the formation of cuttings beds, and strong inhibition.

Inactive Publication Date: 2018-05-29
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong stress sensitivity of unconsolidated sandstone, its pore throat size will change under a certain pressure difference, which makes it difficult for the commonly used "temporary plugging" type of reservoir protection technology to exert its due effect, which undoubtedly increases The difficulty of controlling the depth of drilling fluid solid phase invasion into the reservoir

Method used

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  • Unconsolidated sandstone reservoir protection drilling fluid and preparation method thereof
  • Unconsolidated sandstone reservoir protection drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of unconsolidated sandstone reservoir protection drilling fluid provided by the invention comprises 1% modified cassava flour, 1% xanthan gum, 1% hydroxyethyl cellulose, 1% sodium hydroxide, 0.5% sodium sulfite, 1% Polyethylene wax, 5% fine calcium, 1% potassium amino trimethylene phosphonate.

[0018] The preparation method of described loose sandstone reservoir protection drilling fluid is as follows:

[0019] (1) Add modified cassava flour, xanthan gum, and hydroxyethyl cellulose to water in turn, and stir for 40 minutes;

[0020] (2) Add sodium hydroxide and sodium sulfite, and stir for 10 minutes;

[0021] (3) Add polyethylene wax and fine-grained calcium, and stir for 10 minutes;

[0022] (4) Potassium aminotrimethylene phosphonate was added and stirred for 40 minutes to prepare the drilling fluid for protecting the loose sandstone reservoir.

Embodiment 2

[0024] A kind of unconsolidated sandstone reservoir protection drilling fluid provided by the invention comprises 2% acetylated distarch phosphate, 1% xanthan gum, 0.5% hydroxyethyl cellulose, 2% sodium hydroxide, 0.1% sodium sulfite, 1.5% polyethylene wax, 15% fine calcium, 2% potassium aminotrimethylene phosphonate.

[0025] The preparation method of described loose sandstone reservoir protection drilling fluid is as follows:

[0026] (1) Add the acetylated distarch phosphate, xanthan gum, and hydroxyethyl cellulose in water successively, and stir for 60 minutes;

[0027] (2) Add sodium hydroxide and sodium sulfite, and stir for 15 minutes;

[0028] (3) Add polyethylene wax and fine-grained calcium, and stir for 15 minutes;

[0029] (4) Potassium aminotrimethylene phosphonate was added and stirred for 45 minutes to prepare the drilling fluid for protection of loose sandstone reservoirs.

Embodiment 3

[0031] A kind of unconsolidated sandstone reservoir protection drilling fluid provided by the invention comprises 1% modified cassava flour, 1% acetylated distarch phosphate, 1.5% xanthan gum, 0.5% hydroxyethyl cellulose, 1.5% Sodium Hydroxide, 0.3% Sodium Sulfite, 1% Polyethylene Wax, 5% Fine Calcium, 1.5% Potassium Amino Trimethylene Phosphonate.

[0032] The preparation method of described loose sandstone reservoir protection drilling fluid is as follows:

[0033] (1) Add the modified cassava flour, acetylated distarch phosphate, xanthan gum, and hydroxyethyl cellulose in water successively, and stir for 30 minutes;

[0034] (2) Add sodium hydroxide and sodium sulfite, and stir for 20 minutes;

[0035] (3) Add polyethylene wax and fine-grained calcium, and stir for 20 minutes;

[0036] (4) Potassium aminotrimethylene phosphonate was added and stirred for 45 minutes to prepare the drilling fluid for protection of loose sandstone reservoirs.

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Abstract

The invention discloses an unconsolidated sandstone reservoir protection drilling fluid and a preparation method thereof. The unconsolidated sandstone reservoir protection drilling fluid comprises 1-3% of a starch filtrate reducer, 0.5-2% of xanthan gum, 0.5-3% of hydroxyethyl cellulose, 1-2% of sodium hydroxide, 0.1-0.5% of sodium sulfite, 1-2% of polyethylene wax, 5-15% of fine calcium and 1-2%of aminotrimethylenephosphonic acid potassium salt. The unconsolidated sandstone reservoir protection drilling fluid has the characteristics of strong inhibition capability, low solid-phase content and excellent reservoir protection effect and is suitable for unconsolidated sandstone reservoir drilling protection.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to a loose sandstone reservoir protection drilling fluid and a preparation method thereof. Background technique [0002] Unconsolidated sandstone reservoirs have high shale content, and the clay minerals are mainly expanded montmorillonite or illite-montmorillonite mixed beds with high montmorillonite mixed bedding ratio, followed by middle kaolinite and illite. The characteristics of the reservoir are loose, easy to collapse and easy to leak, and poor diagenesis. Due to the strong stress sensitivity of unconsolidated sandstone, its pore throat size will change under a certain pressure difference, which makes it difficult for the commonly used "temporary plugging" type of reservoir protection technology to exert its due effect, which undoubtedly increases This makes it difficult to control the depth of drilling fluid solid phase invasion into the reservoir. Contents of th...

Claims

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Application Information

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IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/12
Inventor 张坤田增艳马红王敏田玉龙张晓东杨鹏梅刘国卢振华李秦豫
Owner CNPC BOHAI DRILLING ENG
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