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Geothermal drilling plug removal liquid and geothermal drilling plug removal construction method

A technology of geothermal drilling and construction methods, applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc., can solve the problem of increasing the number and depth of entry, affecting reservoir permeability, and decreasing reservoir permeability, etc. problems, to achieve the effect of inhibiting fluoride precipitation, reducing the risk of reservoir damage, and reducing reservoir damage factors

Pending Publication Date: 2021-08-06
中石化绿源地热能(陕西)开发有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drilling fluid is most likely to damage the reservoir during the initial filtration stage. At this time, a dense protective mud cake cannot be formed on the borehole wall, causing solid particles, colloids and various polymer solutions to concentrate into the fracture channels of the formation, and the permeability of the reservoir decreases. resulting in irreparable damage
Moreover, in the conventional positive pressure drilling process, the wellbore pressure is greater than the formation pressure, and the drilling fluid and filtrate tend to flow into the formation. The greater the pressure difference, the greater the driving force, and the result is that the greater the filtration loss, the deeper the drilling fluid enters the formation. Deep, affecting the permeability of the reservoir, causing damage to the reservoir, the number and depth of its entry will increase with the increase of soaking time

Method used

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  • Geothermal drilling plug removal liquid and geothermal drilling plug removal construction method
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  • Geothermal drilling plug removal liquid and geothermal drilling plug removal construction method

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0028] The choice of main acid

[0029] Please refer to Figure 1a-Figure 1g , it can be concluded from the line diagram of the dissolution performance of different acid solutions: the same acid solution has a higher dissolution rate of drill cuttings than cuttings; organic fluorine solution can slowly release F-, reducing the formation of secondary precipitation. Therefore, the components of the main acid solution are determined by The composition in weight percent is 10% hydrochloric acid, 3% formic acid, 5% organic phosphonic acid, and 2% organic fluorine. X-diffraction results before and after dissolution under this component showed that no secondary precipitate component was generated.

experiment example 2

[0031] Corrosion inhibitor selection

[0032] Please refer to Table 1. From the comparison of the performance results of different corrosion inhibitors, it can be seen that 1% SHJF-94 is used as a corrosion inhibitor, and the corrosion rate is the slowest. Therefore, 1% SHJF-94 is selected as a corrosion inhibitor.

[0033] Table 1: Performance results of different corrosion inhibitors

[0034]

experiment example 3

[0036] Clay Stabilizer Selection

[0037] Please refer to Table 2, 1% NH 4 Cl and 0.5% G511-NWJ are used as clay stabilizers, and the anti-swelling rate is the highest. Therefore, 1% NH 4 Cl and 0.5% G511-NWJ were used as clay stabilizers.

[0038] Table 2: Anti-expansion performance results of different clay stabilizers

[0039]

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PUM

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Abstract

The invention belongs to the technical field of geothermal drilling plug removal, and particularly discloses geothermal drilling plug removal liquid and a geothermal drilling plug removal construction method. The geothermal drilling plug removal liquid is prepared from, by weight, 10% of hydrochloric acid, 3% of formic acid, 5% of organic phosphonic acid, 2% of organic fluorine, 0.3% of cellulose acetate, 1% of SHJF-94, 1% of NH4Cl, 0.5% of G511-NWJ, 0.5% of G518-XZ, 0.1% of G503-PRJ, 1.5% of glycol ether and the balance water. The plug removal liquid system is high in self compatibility, the residual acid of the plug removal liquid system and the drilling fluid treating agent are high in compatibility with formation water, and reservoir damage factors caused by incompatibility are reduced.

Description

technical field [0001] The application belongs to the technical field of geothermal drilling plugging removal, in particular to a geothermal drilling plugging removal fluid and a geothermal drilling fluid plugging removal construction method. Background technique [0002] The plugging removal fluid dissolves fine solid particles such as clay and cuttings in the drilling fluid during the drilling process; cooperates with the drilling fluid treatment agent to remove polymeric organic matter residues in the drilling fluid; increases the permeability of the near-wellbore zone by acidifying the reservoir matrix The solid particles contained in high-rate drilling fluid include bentonite, barite powder, iron ore powder, limestone powder and other weighting materials and drilling cuttings. The intrusion of solid particles into the reservoir mainly occurs when the reservoir has just been opened, and the low-pressure and low-pressure reservoir is very sensitive to the intrusion of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52E21B37/06
CPCC09K8/52E21B37/06
Inventor 王鹏涛王瑞飞李红岩刘斌王江峰张献喻孙彩霞黄海王萍赵宇璇陈升强
Owner 中石化绿源地热能(陕西)开发有限公司