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Oil base drilling fluid parameter design method

An oil-based drilling fluid and a design method technology, applied in the field of oil and gas drilling engineering, can solve the problems of high drilling fluid performance and increased cost, and achieve the effects of controlling costs, preventing complex situations in the well, and avoiding excessive performance.

Active Publication Date: 2015-06-24
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The drilling fluid systems of the above two patents both have the advantages of small water loss, good rheological properties, and the ability to keep the wellbore stable. In addition, the performance of the drilling fluid may be too high, resulting in an increase in cost

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  • Oil base drilling fluid parameter design method

Examples

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Embodiment 1

[0088] Such as figure 1 As shown, in this embodiment, a shale formation in a block in Sichuan, China is selected, and the key parameter window of oil-based drilling fluid is designed based on the wetting theory of the formation rock and oil-based drilling fluid system. A method for designing oil-based drilling fluid parameters, which comprises the following steps in sequence:

[0089] Step 1: Test the physical and structural properties of formation rocks through experiments.

[0090] Ten shale formation samples were taken to test their physical and structural properties. X-ray diffraction test is used to test the mineral composition of formation rocks; pyrolysis test and vitrinite reflectance test are used to test the total organic carbon content (TOC), kerogen type, maturity of formation rocks; with the help of scanning electron microscope (SEM) and transmission electron microscope (TEM) to qualitatively observe the two-dimensional pore distribution characteristics in forma...

Embodiment 2

[0147] In this example, the mudstone formation in a block in Karamay, Xinjiang is selected, and the key parameter window of oil-based drilling fluid is designed based on the wetting theory of formation rock and oil-based drilling fluid system. The design method is the same as that of Example 1.

[0148] the difference is:

[0149] Twenty mudstone formation samples were taken, and their physical properties and structural properties were tested respectively. After excluding samples with large errors from the twenty formation rock samples measured, the remaining samples were used for subsequent design. In this embodiment, the data of three typical samples are selected from the remaining samples as an example. The mineral composition, total organic carbon content, kerogen type, and vitrinite reflectance test results of the three formation rock samples are shown in Table 2.1. The porosity and fracture toughness test results of the three formation rock samples are shown in Table 2.2...

Embodiment 3

[0163] In this embodiment, a sandstone formation in a block in Yunnan, China is selected, and the key parameter window of oil-based drilling fluid is designed based on the wetting theory of formation rock and oil-based drilling fluid system. The design method is the same as that of Example 1, except that:

[0164] Twenty-five sandstone formation samples were taken, and their physical properties and structural properties were tested respectively. After excluding samples with large errors from the twenty-five formation rock samples measured, the remaining samples were used for subsequent design. In this embodiment, the data of three typical samples are selected from the remaining samples as an example. The mineral composition, total organic carbon content, kerogen type, and vitrinite reflectance test results of the three formation rock samples are shown in Table 3.1. The porosity and fracture toughness test results of the three formation rock samples are shown in Table 3.2.

[0...

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Abstract

The invention discloses an oil base drilling fluid parameter design method. The oil base drilling fluid parameter design method sequentially includes the following steps: physical properties and structure properties of stratum rock are tested though tests; according to the physical properties and the structure properties of the stratum rock, pore structures of typical mineral and the stratum rock are built, a combined characterization model of oil base drilling fluid parameters to wettability of the stratum rock and an oil base drilling fluid system is built, and a relational graph between the oil base drilling fluid parameters and the wettability is drawn; a well wall stable fixed mechanics model of the stratum rock and the oil base drilling fluid system under the wettability condition is built, and a relational graph between the oil base drilling fluid parameters and the well wall stability is drawn; according to the relational graph between the oil base drilling fluid parameters and the well wall stability, the oil base drilling fluid parameters are determined. According to the oil base drilling fluid parameter design method, a window of the designed oil base drilling fluid parameters is accurate and reachable, the effect of the oil base drilling fluid on keeping the well wall stability can be evaluated in a quantitative mode, underground complex conditions are prevented, and the cost of the oil base drilling fluid is reasonably controlled.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling engineering, and relates to a design method of a drilling fluid system, in particular to a design method of parameters of an oil-based drilling fluid. Background technique [0002] In recent years, wellbore stability has always been a key technical problem restricting oil drilling in my country. In order to maintain the stability of the borehole wall, oil-based drilling fluid is often used for drilling in formations rich in clay minerals with a penetration rate of 90% during drilling. However, for fractured formations with developed fractures, oil-based drilling fluids will still leak into Strata. Especially for mixed-wet formations with a large number of micro-cracks, such as shale formations, mudstone formations, and sandstone formations, the oil-based drilling fluid filtrate is more likely to enter the formation under the action of capillary force, thereby increasing the stress in...

Claims

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Application Information

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IPC IPC(8): G06F19/00E21B49/00
Inventor 卢运虎金衍张亚云陈勉梁川侯冰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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