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Strong-inhibition water-base drilling fluid

A water-based drilling fluid and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as insufficient stability, poor hydrate inhibition ability, and difficulty in meeting the technical requirements of deep-water oil and gas drilling engineering. Achieve the effects of suppressing wellbore instability and good low-temperature-high temperature stability

Active Publication Date: 2015-07-01
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Oil-based / synthetic-based drilling fluid has the advantages of excellent inhibition and high temperature stability, and is the first choice for drilling in complex formations, but its cost is high and there are environmental problems
Water-based drilling fluids have the advantages of low cost and environmental protection, but in deepwater drilling, conventional water-based drilling fluids are difficult to solve the problem of wellbore instability in deep-water shallow unconsolidated formations, and have poor hydrate inhibition ability, "low temperature-high temperature" Insufficient stability and other shortcomings, it is difficult to meet the engineering technology needs of deepwater oil and gas drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1. Preparation of freshwater-based deepwater drilling fluid with strong inhibition

[0046] Prepare the freshwater-based deepwater drilling fluid system, including the following components by weight percentage:

[0047] Bentonite: 4%; strong polyamine inhibitor: 3%; polyacrylamide (PAM, produced by Renqiu Deli Petroleum Auxiliary Co., Ltd.): 0.1%; NaCl: 25%; polyanionic cellulose (PAC-HV, Renqiu Yanxing Chemical Co., Ltd.): 0.1%; sulfonated phenolic resin (SD-101, Dongying Shida Innovation Technology Co., Ltd.): 3%; sodium polyacrylate (Xinxiang Jinghui Synthetic Materials Co., Ltd. production): 1%; water-based lubricant (SD-506, produced by Dongying Shida Innovation Technology Co., Ltd.): 1%; fresh water is 100%.

[0048] The polyamine strong inhibitor used in the present embodiment is prepared by the following method:

[0049]Add 330 g of diethylene glycol bis(3-aminopropyl) ether and 0.33 g of potassium hydroxide into a high-temperature and high-pressure re...

Embodiment 2

[0050] Example 2. Preparation of seawater-based deep-water drilling fluid with strong inhibition

[0051] Prepare the seawater-based deepwater drilling fluid system, including the following components by weight percentage:

[0052] Bentonite: 3%; strong polyamine inhibitor: 3%; cationic polyacrylamide (CPAM, produced by Dongying Nuoer Chemical Co., Ltd.): 0.1%; xanthan gum (XC, produced by Renqiu Yanxing Chemical Co., Ltd.) : 0.15%; NaCl: 20%; sulfonated phenolic resin (SMP-1, produced by Henan Xinxiang Yikang Drilling Auxiliary Co., Ltd.): 4%; sodium polyacrylate (produced by Xinxiang Jinghui Synthetic Materials Co., Ltd.): 1%; extreme pressure lubricant (SD-505, produced by Dongying Shida Innovation Technology Co., Ltd.): 1%; sulfonated asphalt: 1.5%; sea water (Bohai Sea) is counted as 100%.

[0053] The preparation method of the strong polyamine inhibitor used in this example is the same as that in Example 1.

Embodiment 3

[0054] Example 3. Preparation of seawater-based deepwater drilling fluid with strong inhibition

[0055] Prepare a weighted seawater-based deepwater drilling fluid system, including the following components by weight percentage:

[0056] Bentonite: 3%; strong polyamine inhibitor: 3%; cationic polyacrylamide (CPAM, produced by Dongying Nuoer Chemical Co., Ltd.): 0.1%; xanthan gum (XC, produced by Renqiu Yanxing Chemical Co., Ltd. ): 0.15%; NaCl: 20%; sulfonated phenolic resin (SD-101, produced by Dongying Shida Innovation Technology Co., Ltd.): 4% Sodium polyacrylate (produced by Xinxiang Jinghui Synthetic Materials Co., Ltd.): 1% ; Extreme pressure lubricant (SD-505, produced by Dongying Shida Innovation Technology Co., Ltd.): 1%; sulfonated asphalt: 1.5%; barite: 30%; sea water (Bohai Sea) is 100%.

[0057] The preparation method of the strong polyamine inhibitor used in this example is the same as that in Example 1.

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Abstract

The invention discloses a strong-inhibition water-base drilling fluid which comprises the following components in parts by mass: 100 parts of water, 0.2-4 parts of polyamine inhibitor, 0.1-1 part of coating inhibitor, 10-25 parts of hydrate inhibitor, 0.1-1 part of tackifier, 0.5-5 parts of fluid loss agent and 0.5-3 parts of liquid lubricant. The polyamine inhibitor is an amino polymer polymerized from polyether diamine and epoxy alkane; and the mol ratio of the polyether diamine to the epoxy alkane is 1-10:1-20. The drilling fluid disclosed by the invention can effectively inhibit wellbore instability of deepwater shallow strata, and has equivalent inhibition capability to an oil-base drilling fluid. The drilling fluid disclosed by the invention can solve the problem of generation of hydrate in deepwater drilling, and is applicable to 3000m-deep drilling operation. The drilling fluid disclosed by the invention has favorable low temperature-high temperature stability, and is applicable to a deepwater large-temperature-difference environment (2-150 DEG C).

Description

technical field [0001] The invention relates to a drilling fluid for petroleum drilling, in particular to a strongly inhibited water-based drilling fluid. Background technique [0002] Oceanic deepwater oil and gas resources are abundant and have great potential. Compared with land or shallow sea drilling, marine deepwater drilling faces many special technical problems, requiring deepwater drilling fluids to have the following characteristics: (1) Effectively inhibit the hydration and dispersion of deep-water and shallow loose formations. Due to different depositional patterns, deep-water and shallow formations lack upper compaction, have poor cementation, and are prone to hydration and dispersion, causing wellbore instability. (2) Good low temperature rheology. As the water depth increases, the seawater temperature becomes lower and lower, and the temperature drops to 4°C when the water depth exceeds 1219m in the deep water area of ​​the Gulf of Mexico and West Africa. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C09K8/16C09K8/12
Inventor 刘书杰邱正松赵欣邢希金黄维安李玉光江琳钟汉毅
Owner CHINA NAT OFFSHORE OIL CORP
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