Stress test method for oil well casing

A technology of oil well casing and testing method, which is applied in the direction of construction, etc., can solve the problems that the in-situ stress test of shallow ultra-heavy oil reservoirs cannot be carried out, and achieve the effect of improving steam injection efficiency and reducing heat loss

Active Publication Date: 2019-11-08
PETROCHINA CO LTD
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a stress testing method for oil well casing to solve the problem that the in-situ stress testing of shallow ultra-heavy oil reservoirs cannot be carried out in the prior art

Method used

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  • Stress test method for oil well casing
  • Stress test method for oil well casing
  • Stress test method for oil well casing

Examples

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Embodiment 1

[0070] The stress testing method for oil well casing provided in this embodiment includes the following steps:

[0071] 1. Measure the in-situ stress of a vertical well F1 in the ultra-heavy oil block of Xinjiang Oilfield. The casing depth of the well is 100m. According to the core data and engineering design requirements of the core well in the block, the reservoir cap layer ( There are five test sections in total, oil layer (section 3), and bottom layer (section 1). Perforation is carried out at the corresponding oil well casing of these five test sections. YD-89 perforating bullet cable is used for perforation. The perforation density is 20 holes / m, and each perforation section is 0.5m.

[0072] 2. After the perforation is completed, use a Ф152mm×1000mm (diameter×length) gage to pass the well to the artificial bottom.

[0073] 3. Use a 177.8mm wall scraper to scrape the casing of the oil well to the bottom of the artificial well, and scrape the wall three times in the test sectio...

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Abstract

The invention provides a stress test method used for an oil well casing. The test method comprises the following steps that S1, the oil well casing arranged in a formation is subjected to selection of test well sections, and holes are drilled in the selected test well sections to form perforation well sections; S2, water is injected into the perforation well sections, and the instantaneous closing pressure Ps of rocks in the corresponding positions of the perforation well sections is tested after water injection is stopped; S3, after water in the perforation well sections is drained, water is injected into the perforation well sections again, and the fracture reopening pressure Pr of the rocks in the corresponding positions of the perforation well sections is tested; and S4, computing is conducted according to the instantaneous closing pressure and the fracture reopening pressure, and the maximum horizontal principal stress sigma Hmax and minimum horizontal principal stress sigma Hmin of the rocks in the corresponding positions of the perforation well sections are obtained. Through the stress values, the optimal steam injection pressure of shallow ultra-viscosity oil reservoirs is effectively determined, and then the steam injection efficiency can be effectively improved, and the heat loss of steam is lowered.

Description

Technical field [0001] The invention relates to the technical field of petroleum exploitation, and in particular to a stress testing method for casings of oil wells. Background technique [0002] In-situ stress is a mechanical parameter that causes the response deformation in the internal elements of the medium under the action of gravity, earth's tectonic force, astronomical dynamics, and additional dynamics of exploration engineering. It can also be referred to as the stress in the crust. Petroleum forms and occurs in crustal rocks. The magnitude and change of in-situ stress is one of the factors that control various parameters such as the distribution of oil and gas enrichment areas, hydraulic fracture propagation, reservoir fracture distribution, long-term external loading of oil well casings, and drilling formation fracture pressure and collapse pressure. It is also indispensable basic data for the formulation of oil and gas field development plans and oil well engineering ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/007
Inventor 张磊陈森黄勇游红娟郭文德何小东李林蒲丽萍伍文英
Owner PETROCHINA CO LTD
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