Low-surface-tension solid-free reservoir protection drilling fluid

A low surface tension, reservoir protection technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of liquid phase intrusion into the reservoir and other problems, achieve excellent inhibition and lubricity, and reduce friction. resistance, good inhibition effect

Inactive Publication Date: 2014-02-19
克拉玛依市金鑫科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluid loss of this invention is significantly larger than the API standard requirement that the reservoir fluid loss is less than 5ml, and it does not solve the possible damage caused by the liquid phase intrusion into the reservoir

Method used

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  • Low-surface-tension solid-free reservoir protection drilling fluid
  • Low-surface-tension solid-free reservoir protection drilling fluid
  • Low-surface-tension solid-free reservoir protection drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Basic performance of low surface tension solid-free reservoir protection drilling fluid

[0020] (1) Formula 1: Calculated according to the mass added per 100 ml of water: 0.2 grams of soda ash, 0.2 grams of pH value regulator, 0.8 grams of polymer emulsion strong coating agent, 1.5 grams of fluid loss reducer, 0.3 grams of shearing agent, polymer 2 grams of alcohol, 0.5 gram of surfactant, 0.05 gram of antioxidant, 0 gram of soluble salt. (2) Formula 2: Calculated according to the mass added per 100 ml of water: 0.3 grams of soda ash, 0.4 grams of pH regulator, 1 gram of polymer emulsion strong coating agent, 2.5 grams of fluid loss reducer, 1 gram of shearing agent, polymer 3 grams of alcohol, 1.5 grams of surfactant, 0.1 gram of antioxidant, 300 grams of soluble salt.

[0021] (3) Formula 3: Calculated according to the mass added per 100 ml of water: 0.25 grams of soda ash, 0.3 grams of pH regulator, 0.9 grams of polymer emulsion strong coating agent,...

Embodiment 2

[0026] Embodiment 2: This embodiment mainly evaluates the temperature resistance of the drilling fluid of the present invention

[0027] (1) Formula: Formula 3 in Example 1 is selected.

[0028] (2) According to the standard GB / T16783.1-2006, the apparent viscosity, plastic viscosity, dynamic shear force and fluid loss of the drilling fluid are tested. The test results are shown in Table 2:

[0029] Table 2: Rheology and water loss data table of drilling fluid of the present invention at different temperatures

[0030]

[0031] It can be seen from Table 2 that the drilling fluid of the present invention has excellent temperature resistance, and its performance is basically stable in a wide temperature range, indicating that it can be applied to oil wells with different depths and different formation temperatures.

Embodiment 3

[0032] Embodiment 3: This embodiment mainly evaluates the anti-salt pollution ability of the drilling fluid of the present invention

[0033] (1) Formula: select formula 3 in Example 1, add NaCl, CaCl on this basis 2 and MgCl 2 , to examine the salt resistance.

[0034] (2) According to the GB / T16783.1-2006 standard, the apparent viscosity, plastic viscosity and dynamic shear force of the drilling fluid are tested. The test results are shown in Table 3-Table 4:

[0035] Table 3: Evaluation data 1 of the salt resistance ability of the drilling fluid of the present invention

[0036]

[0037] Table 3: Evaluation data 2 of the salt resistance ability of the drilling fluid of the present invention

[0038]

[0039] It can be seen from Table 3 and Table 4 that the drilling fluid of the present invention has strong salt resistance and can resist high-content Na + , Ca 2+ , Mg 2+ Salt erosion, anti-calcium salt, magnesium salt can reach more than 10%, and anti-sodium...

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Abstract

The invention relates to a low-surface-tension solid-free reservoir protection drilling fluid, and belongs to the technical field of petrochemical engineering. The low-surface-tension solid-free reservoir protection drilling fluid comprises, by mass, 0.2-0.3 gram of sodium carbonate, 0.2-0.4 gram of PH-value conditioning agent, 0.8-1 gram of polymer emulsion powerful coat agent, 1.5-2.5 grams of fluid loss additive, 0.3-1 gram of shearing potentiator, 2-3 grams of polymeric alcohol, 0.5-1.5 grams of surfactant, 0.05-0.1 gram of antioxidant and 0-300 grams of soluble salt in every 100ml of water in an evenly-mixed mode. The low-surface-tension solid-free reservoir protection drilling fluid does not have the solid content, the surface tension is lower than 30mN/m, and the low-surface-tension solid-free reservoir protection drilling fluid has the good reservoir protection effect and is particularly suitable for horizontal well reservoir section drilling.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a low surface tension solid-phase reservoir protection drilling fluid. Background technique [0002] With the deepening of exploration and development, people pay more and more attention to the importance of reservoir protection. Drilling fluid is an indispensable working fluid in the drilling process, and there are many possible damages. Among them, in terms of the drilling fluid system itself, the damage caused by solid phase invasion and liquid phase invasion is the most serious. After the clay and inert particles in the drilling fluid enter the reservoir with the filtrate, when the diameter of the particles reaches more than one-third of the pores or pore throats, it may cause permanent damage to the reservoir. Therefore, the study of solid-free drilling fluid systems has become a An important direction of reservoir protection. [0003] However, the solid-fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 王茂仁王晨魏宏
Owner 克拉玛依市金鑫科技有限公司
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