Coal-bed gas well short frontal distance from target point horizontal well integration process method

A technology for coalbed methane wells and process methods, which is applied in wellbore/well components, production fluids, directional drilling, etc., and can solve problems such as matching use and lack of reservoir stimulation technology.

Active Publication Date: 2020-09-25
陕西瑞鹰国际油气工程技术服务有限公司 +1
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Problems solved by technology

[0009] Conventional short-target wells are affected by comprehensive factors such as borehole size, boreho

Method used

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Embodiment Construction

[0054] A method for the integration of horizontal wells with short target front distance in coalbed methane wells, comprising the following steps:

[0055] (1) Wellbore preparation;

[0056] a. Determine the state of the well connection, and determine the downhole working conditions of old wells in inclined and straight wells; under normal circumstances, there are 5-1 / 2” steel casings to the wellhead in old wells in inclined and straight wells, and the return height of cementing cement is generally about 300m. There are 2-7 / 8" oil pipes, oil suction pipes, and conventional drainage pumps to the vicinity of the target coal seam.

[0057] b. Downhole actual exploration: After connecting the well, take out the original downhole tools, drill down to investigate the downhole situation, and drill the cement slurry to seal the perforation section of the original reservoir;

[0058] C. Well scraper: Run the well gauge and scraper, scrape the pipe repeatedly at the expected position o...

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Abstract

The invention relates to the technical field of short frontal distance from target point horizontal well drilling processes, in particular to a coal-bed gas well short frontal distance from target point horizontal well integration process method. According to the coal-bed gas well short frontal distance from target point horizontal well integration process method, window sidetracking can be carried out in a minimum casing pipe of five and a half inches (the outer diameter is 139.7 mm and the inner diameter is 124 mm), new well hole drilling can be carried out, and the adaptability is wide; theangle building hole rate ranges from 0.4-1 degrees/m, and the effective footage is saved; the drilling construction is combined with geosteering, and the coal seam landing accuracy and the drilling ratio are improved; clean water is used for horizontal section well drilling construction, and the reservoir pollution is avoided; the length of a horizontal section is larger than 200 m, and a coal seam control area is enlarged; a well completion pipe string adopts a hanger, a steel casing pipe and a ball activated sliding sleeve, the well completion well cementation is carried out, an annulus below the hanger is sealed, the support is provided for follow-up transformation while a well wall is supported; and the reservoir transformation is combined with a fracturing technology, an oil and gaschannel is enlarged, and the single well yield is increased.

Description

technical field [0001] The invention relates to the technical field of drilling technology for horizontal wells with short target distance, in particular to an integrated process method for coalbed gas wells with short target distance and horizontal wells. Background technique [0002] At present, in the conventional oil and gas industry, there are still some technologies that can be completed in one aspect of drilling, well completion and reservoir transformation, but they cannot meet the production requirements or even be implemented when they are combined. The main reasons are as follows: [0003] 1. Drilling [0004] Conventional short-target approach drilling cannot use geosteering tools when building deflection and drilling in the horizontal section, and cannot judge whether the landing point of the coal seam is accurate, nor can it judge whether the horizontal section drilling is passing through the coal seam. [0005] Due to the large curvature of conventional shor...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B7/06E21B33/13E21B43/26
CPCE21B7/06E21B33/13E21B43/006E21B43/261
Inventor 兰友根尚朝锋代立强田杰张守斌游艳平刘建民
Owner 陕西瑞鹰国际油气工程技术服务有限公司
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