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Strong-plugging hydrophobic high-performance water-based drilling fluid

A water-based drilling fluid and hydrophobic technology, which is applied in the field of petroleum drilling engineering, can solve the problems of drill sticking due to the accumulation of cuttings beds, insufficient lubrication and anti-sticking ability, and restrictions on the exploration and development of tight gas.

Active Publication Date: 2020-10-23
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The brine drilling fluid used in the early stage of this block has poor inhibition and cannot effectively seal the micro-cracks and pores existing in the shale formation. At the same time, the ability to lubricate and prevent sticking is insufficient, resulting in frequent occurrence of bit bumps, well wall dropouts, etc. during drilling operations. Complicated downhole conditions such as accumulation of cuttings bed, sticking and severe back pressure have affected the efficient completion of logging and cementing operations. The performance of existing drilling fluids cannot meet the actual requirements of downhole formations, which seriously restricts the compactness of this block. In the process of gas exploration and development, the difficulty of drilling fluid to meet the requirements has become an important obstacle to the comprehensive, efficient, economical and safe development of tight gas in the Linxing-Shenfu block

Method used

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  • Strong-plugging hydrophobic high-performance water-based drilling fluid
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  • Strong-plugging hydrophobic high-performance water-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] 1.1 Preparation of aqueous monomer solution: add 40 mL of deionized water to a beaker, and mix the dimethyl carbonate (DMC), acrylamide (AM), acrylic acid (AA), dimethylaminoethyl methacrylate (DMAEMA) The four monomers are weighed according to the total monomer mass of 20% (8.0g), and the monomer mass ratio is 1:3:2:4 (0.8g:2.4g:1.6g:3.2g), under ice bath conditions Dissolve in a beaker, add 0.5g of sodium hydroxide, use pH test paper to adjust the pH value of the solution to about 7, use a magnetic stirrer to stir for 10 to 30 minutes, and stir evenly to obtain the inner phase.

[0078] 1.2 Preparation of oil phase solution: add 60mL 3# white oil to a beaker, then add 3% emulsifier Span 80 (1.8g), stir with a magnetic stirrer for 10-20 minutes until the emulsifier is fully dissolved, and the oil phase is obtained .

[0079] 1.3 Preparation of emulsion: After cleaning the high-speed shear emulsifier, pour the oil phase into a large beaker, and place the beaker in an i...

Embodiment 2

[0086] 2.1 First add 100mL of distilled water to a three-necked flask, add 0.5% (0.5g) of silicon dioxide powder, add 1% (1.0g) of silane coupling agent KH550, and stir at room temperature for 30 minutes at high speed.

[0087] 2.2 Gradually add 2.0 g of cetyl acrylate monomer and 8.0 g of acrylamide monomer into the three-necked flask, mix well, raise the temperature to 65°C, and keep stirring for 4 hours. After the reaction is finished, a liquid hydrophobic plugging and anti-slump agent for drilling fluid can be obtained, which is designated as SFF-1.

[0088] Evaluation of the anti-slump effect of the hydrophobic type plugging and anti-slump agent SFF-1 for drilling fluid obtained in Example 2:

[0089] Hydrophobic plugging and anti-slump agent SFF-1 for drilling fluid improves the anti-slump effect through two aspects. On the one hand, through the rigid plugging effect of silica particles, it plugs the micro-cracks and micro-pores of the well wall and prevents water from e...

Embodiment 3

[0093] 3.1 First, add 100mL of distilled water to a three-necked flask, add 0.2% (0.2g) of nano-ferric oxide powder, add 1.5% (1.5g) of silane coupling agent KH560, and stir at room temperature for 30 minutes at high speed.

[0094] 3.2 Gradually add 2.0g of myristyl acrylate monomer, 4.0g of acrylamide monomer, and 4.0g of acrylic acid monomer into a three-necked flask, mix well, raise the temperature to 60°C, and keep stirring for 4 hours. After the reaction is finished, it is dried to obtain the hydrophobic plugging lubricant powder SFR-1 for drilling fluid.

[0095] The performance evaluation of hydrophobic type plugging lubricant SFR-1 for drilling fluid obtained in embodiment 3:

[0096]Hydrophobic plugging lubricant SFR-1 for drilling fluid combines the two aspects of particle rolling and hydrophobicity to improve the lubrication effect, reduce friction and torque. Refer to SY / T 6094-1994 "Evaluation Procedures for Lubricants for Drilling Fluids", the evaluation index ...

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Abstract

The invention provides a strong-plugging hydrophobic high-performance water-based drilling fluid. The strong-plugging hydrophobic high-performance water-based drilling fluid comprises bentonite slurry, sodium hydroxide, a polymer coating inhibitor, a filtrate reducer, an anti-collapse agent, a lubricant, a plugging agent, an activity regulator and a tackifying and shear strength improving agent. According to the strong-plugging hydrophobic high-performance water-based drilling fluid of the invention, the polymer coating inhibitor, the filtrate reducer, the anti-sloughing agent, the lubricant,the blocking agent and the tackifying and shear strength improving agent are used as core treating agents, so that the well wall stability, the inhibition capability, the lithology carrying capabilityand the lubricating anti-sticking performance of the obtained water-based drilling fluid completely meet the requirements of a tight gas exploratory well and a development well in a Linxing-Shenfu block; the plugging of micro-nano hole seams is realized; the large-amplitude hydration expansion of shale is avoided; a good lubricating effect is achieved; the underground pressure supporting condition is effectively reduced; the purposes of improving the mechanical drilling speed, reducing the underground accident rate and saving the cost are achieved; the environment-friendly requirement can bemet; the product is a non-toxic pollution-free product; the cost of the product is low; and the economic requirement is met.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling engineering, and in particular relates to a strong plugging and hydrophobic type high-performance water-based drilling fluid. Background technique [0002] The Linxing-Shenfu tight gas block located on the eastern edge of the Ordos Basin is currently in the initial stage of exploration and development. With the continuous increase of drilling operations, the geological conditions of the formation have been basically understood, and the single well is prone to leakage, collapse and anomalies. The formation has a certain understanding. During the drilling process, the drilling fluid faces many technical difficulties, such as: wellbore stability, lost circulation, wellbore purification (drilling fluid carrying rock), lubrication and anti-seizing, high cost, etc., especially in the upper Quaternary slate of this block. Vicious leakage in the formation, Yanchang Formation to Zhifang Formati...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/035C09K8/24C09K8/42C09K8/504C09K8/508C09K8/84C09K8/88C08F220/34C08F220/06C08F220/56C08F292/00C08F220/18
CPCC09K8/03C09K8/032C09K8/035C09K8/24C09K8/5083C09K8/426C09K8/882C09K8/845C09K8/5045C08F220/34C08F292/00C09K2208/12C09K2208/34C08F220/06C08F220/56C08F220/1818
Inventor 李斌蒋官澄张红杰崔凯潇杨程张林强杨丽丽孙泽宁王鹏姜磊亓银波江智勋王易忠贺垠博董腾飞
Owner CHINA NAT OFFSHORE OIL CORP
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