High-density low-solid-phase drilling fluid

A low-solids and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve problems such as weak inhibition, formation environmental pollution, reservoir pore throat plugging, etc., to reduce activity, Reduce the effect of penetrating trends

Inactive Publication Date: 2017-07-04
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used drilling fluids mainly include oil-based drilling fluid, potassium chloride brine drilling fluid, sodium chloride brine drilling fluid, organic salt drilling fluid, etc. Oil-based drilling fluid has problems such as high cost and pollution to the formation and the environment. Ordinary brine-based drilling fluid, the salt in the system is mainly monovalent salts such as sodium salt and potassium salt, which are weaker than divalent salts such as calcium ions. In the case of high density, a large amount of barite should be added to the drilling fluid Such inert materials can easily cause reservoir pore throat plugging and cause irreversible damage to the reservoir

Method used

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  • High-density low-solid-phase drilling fluid
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of high-density low-solid phase drilling fluid provided by the invention comprises 1% bentonite, 2% hydroxypropyl starch, 1% polyanionic cellulose, 1% guar gum, 1% imidazoline, 1% Magnesium Oxide, 0.1% Sodium Sulfite, 2% Fine Calcium, 65% Calcium Chloride, 40% Calcium Bromide and Water.

[0028] The preparation method of the high-density low-solid phase drilling fluid is as follows:

[0029] (1) At a rotating speed of 12000r / min, add 1% bentonite to the water while stirring, and stir for 30min;

[0030] (2) Add 2% hydroxypropyl starch, 1% polyanionic cellulose, and 1% guar gum successively, and stir for 30 minutes;

[0031] (3) Add 1% imidazoline and stir for 10 min;

[0032] (4) Add 1% magnesia and 2% fine calcium successively, and stir for 20 minutes;

[0033] (5) Add 0.1% sodium sulfite, 65% calcium chloride, and 40% calcium bromide in sequence, and stir for 45 minutes to prepare the high-density low-solid drilling fluid.

Embodiment 2

[0035] A kind of high-density low-solid phase drilling fluid provided by the present invention comprises 1.5% bentonite, 3% carboxymethyl starch, 1.0% methyl cellulose, 0.5% carboxymethyl cellulose, 1% flax gum , 1% Benzotriazole, 1.5% Magnesium Oxide, 0.2% Sodium Sulfite, 1% Fine Calcium, 50% Calcium Chloride, 140% Calcium Bromide and water.

[0036] The preparation method of the high-density low-solid phase drilling fluid is as follows:

[0037] (1) At a rotating speed of 8000r / min, add 1.5% bentonite to the water while stirring, and stir for 20 minutes;

[0038] (2) Add 3% carboxymethyl starch, 1.0% methylcellulose, 0.5% carboxymethylcellulose, 1% flax gum successively, and stir for 40min;

[0039] (3) Add 1% benzotriazole and stir for 15 minutes;

[0040] (4) Add 1.5% magnesia and 1% fine calcium successively, and stir for 20 minutes;

[0041] (5) Add 0.2% sodium sulfite, 50% calcium chloride, and 140% calcium bromide in sequence, and stir for 30 minutes to prepare the ...

Embodiment 3

[0043] A kind of high-density low-solid phase drilling fluid provided by the present invention comprises 1% bentonite, 1% dialdehyde starch, 1% acrylamide starch, 2% hydroxyethyl cellulose, 0.5% squash gum, 0.5% Coumarin, 1% Benzotriazole, 2% Magnesium Oxide, 0.2% Sodium Sulfite, 3% Fine Calcium, 60% Calcium Chloride, 90% Calcium Bromide and Water.

[0044] The preparation method of the high-density low-solid phase drilling fluid is as follows:

[0045] (1) At a rotating speed of 10000r / min, add 1% bentonite to the water while stirring, and stir for 20min;

[0046] (2) Add 1% dialdehyde starch, 1% acrylamide starch, 2% hydroxyethyl cellulose, 0.5% kale gum, and 0.5% coumarin in sequence, and stir for 45 minutes;

[0047] (3) Add 1% benzotriazole and stir for 15 minutes;

[0048] (4) Add 2% magnesia and 3% fine calcium successively, and stir for 20 minutes;

[0049] (5) Add 0.2% sodium sulfite, 60% calcium chloride, and 90% calcium bromide in sequence, and stir for 45 minute...

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Abstract

The invention discloses a high-density low-solid-phase drilling fluid comprising 1-2% of bentonite, 1-3% of a starch-series fluid loss additive, 1-3% of a cellulose-series fluid loss additive, 1-3% of vegetable gum, 1-3% of a corrosion inhibitor, 1-2% of magnesium oxide, 0.1-0.5% of a deoxidant, 1-5% of fine-mesh calcium, 50-65% of calcium chloride and 40-140% of calcium bromide. The high-density low-solid-phase drilling fluid has strong inhibition property, low solid phase content, strong anti-salt-pollution capability and good reservoir protection effect, and can be used for reservoir protected well drilling in a strong water-sensitive formation.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to a high-density low-solid phase drilling fluid. Background technique [0002] With the development of the petroleum industry at home and abroad and the increasing demand for petroleum, the scope of petroleum exploration and development is becoming wider and wider. When drilling into strong water-sensitive reservoirs, the hydration, expansion, dispersion and migration of formation clay may easily cause reservoir pores to be blocked. Such water sensitivity damage will cause the permeability of the reservoir to decrease. Therefore, when drilling in strong water sensitive reservoirs, drilling fluids with strong inhibition must be used. At present, the commonly used drilling fluids mainly include oil-based drilling fluid, potassium chloride brine drilling fluid, sodium chloride brine drilling fluid, organic salt drilling fluid, etc. Oil-based drilling fluid has problems such as...

Claims

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Application Information

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IPC IPC(8): C09K8/20
CPCC09K8/206C09K2208/12C09K2208/32
Inventor张坤郭剑梅黄达全王伟忠魏尽然王敏李文娟王磊磊孙双龙涛郭立华舒儒宏
OwnerCNPC BOHAI DRILLING ENG