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Oil exploiting method conducted through horizontal infilled well in cooperation with underground authigenic mixed-phase thermal fluid

A self-generated miscible heat and horizontal well technology, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve problems such as difficult production, difficult economic benefits, ultimate recovery rate, and little increase in oil recovery rate, etc. Achieve the effect of increasing the available reserves, flexible application, and reducing the corrosion of steam to the wellbore

Inactive Publication Date: 2017-08-11
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional dense well pattern method only increases the available crude oil reserves, but does not change the oil production method, and there will still be some "dead oil" that is difficult to use. If the original formation crude oil is heavy oil or super heavy oil , although the intensified well pattern increases the movable reserves, it does not improve the ultimate recovery rate and oil recovery rate, and it is difficult to cause economic benefits

Method used

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  • Oil exploiting method conducted through horizontal infilled well in cooperation with underground authigenic mixed-phase thermal fluid
  • Oil exploiting method conducted through horizontal infilled well in cooperation with underground authigenic mixed-phase thermal fluid
  • Oil exploiting method conducted through horizontal infilled well in cooperation with underground authigenic mixed-phase thermal fluid

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Effect test

Embodiment 1

[0048] In a block of an oilfield, the depth of the oil layer is 1850 meters, the temperature of the oil layer is 53 degrees Celsius, the thickness of the oil layer is 10 meters, the viscosity of crude oil is 42000 mPas, and the original formation pressure is 18.2 MPa. The horizontal wells are 800 meters apart, and water flooding has been carried out. At present, the water injection pressure is high, the water injection volume is small, and the recoverable reserves in the oil layer are small. The current water injection pressure is 27 MPa, the water injection volume is 30 cubic meters per day, and the current recovery rate is 3.5%.

[0049] Step 1: Arrange infill wells, refer to figure 1 B. image 3 A. The distribution of the intensified horizontal well is opposite to that of the original horizontal well, and the horizontal section of the intensified horizontal well is horizontally aligned with the horizontal section of the original horizontal well, and the distance between th...

Embodiment 2

[0057] In a block of an oilfield, the depth of the oil layer is 2,500 meters, the temperature of the oil layer is 45 degrees Celsius, the thickness of the oil layer is 15 meters, the viscosity of crude oil is 32,000 mPas, and the original formation pressure is 15.6 MPa. Horizontal well spacing is 1000 meters. Water flooding has been carried out, the current water injection pressure is 15 MPa, the water injection volume is 400 cubic meters per day, the current recovery rate is 20%, and the water content of the produced fluid is 90%.

[0058] Step 1: Arrange infill wells, refer to figure 1 E. image 3 C. The intensified horizontal well is distributed in the opposite direction to the original horizontal well. The horizontal section of the intensified horizontal well and the horizontal section of the original horizontal well are distributed in a lateral dislocation, and the heel of the intensified horizontal well is 400 meters in front of the toe of the original horizontal well, ...

Embodiment 3

[0066] In a block of an oilfield, the depth of the oil layer is 2,350 meters, the temperature of the oil layer is 70 degrees Celsius, the thickness of the oil layer is 13 meters, the viscosity of crude oil is 86,000 mPas, the original formation pressure is 22 MPa, the well layout method is a horizontal well pattern, and the length of the horizontal section is 900 meters. The horizontal well spacing is 600 meters. Due to the high viscosity of the crude oil in the formation, the crude oil does not have fluidity in the oil layer. The current production belongs to primary oil production.

[0067] Step 1: Arrange infill wells, refer to figure 1 F. image 3 B. The distribution of the intensified horizontal well is opposite to that of the original horizontal well, the horizontal section of the intensified horizontal well and the horizontal section of the original horizontal well are distributed in a lateral dislocation, and the heel of the intensified horizontal well is located 300 m...

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Abstract

The invention discloses an oil exploiting method conducted through a horizontal infilled well in cooperation with underground authigenic mixed-phase thermal fluid, and relates to the technical field of oil field oil exploiting. The oil exploiting method includes the steps that in the exploiting middle-late stage of an oil-field horizontal well pattern, geological data is combined, the horizontal infilled well is arranged in the horizontal well pattern with the low productivity, well-completion practices are matched, an underground mixed-phase thermal fluid generator is put into the root of the horizontal infilled well downwards after well completion, a matched ground feeding system is arranged, then the underground authigenic mixed-phase thermal fluid is started to be used for displacement oil exploiting, and crude oil is exploited from an original horizontal well. According to the oil exploiting method, the horizontal infilled well and a mixed-phase thermal fluid drive are arranged, the oil exploiting method can be applied to the horizontal well pattern with the low productivity in the exploiting middle-late stage of an oil field for increasing production, and compared with a traditional infilled well pattern, the recovery-ratio increasing effect is more remarkable.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to an oil recovery method in which an intensified horizontal well is combined with downhole self-generated mixed-phase thermal fluid. Background technique [0002] In recent years, horizontal well injection-production well patterns have been widely used in oilfield development and production, while offshore oilfields usually use horizontal wells for development and form a horizontal well-horizontal well injection-production system. In the middle and late stages of oilfield development, it is usually necessary to drill infill wells to improve the injection-production well pattern and improve the development effect. However, the traditional intensified well pattern method only increases the available crude oil reserves, but does not change the oil production method, and there will still be some "dead oil" that is difficult to use. If the original formation crude oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B43/243
CPCE21B43/305E21B43/243
Inventor 王磊马骁付小坡白玉杰高超王培龙张志群李新袁鹏飞吴浩然
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD