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Method and combined solution for increasing productivity of low-porosity, low-permeability and low-pressure reservoir oil well

A low-permeability, combined fluid technology, applied in drilling compositions, chemical instruments and methods, earthwork drilling and mining, etc., can solve problems such as complex construction process, high operating cost, and short validity period

Inactive Publication Date: 2015-12-16
YANAN SHUANGFENG PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology has high maturity and is currently the main technology for the development of low-permeability oil and gas reservoirs, but its operation cost is high, the construction process is complicated, and the validity period is short; the intralayer explosion technology first creates a hydraulic fracture, sends solid explosives into the depth of the fracture, and then Ignite the explosives to generate crush zones or shear fractures near the main fractures, so as to increase the productivity of oil wells

Method used

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  • Method and combined solution for increasing productivity of low-porosity, low-permeability and low-pressure reservoir oil well
  • Method and combined solution for increasing productivity of low-porosity, low-permeability and low-pressure reservoir oil well
  • Method and combined solution for increasing productivity of low-porosity, low-permeability and low-pressure reservoir oil well

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1: the test of No. 1 oil well in Yanchang Oilfield

[0074] 1. Investigate the geological conditions and wellbore structure of No. 1 oil well

[0075] Investigate the wellbore structure when the present invention works, know that this oil well reservoir belongs to sandstone and siltstone; Low porosity and low permeability oil layer; The well depth is 1428.3m; the perforation range is 1324.2-1353.5m; the daily fluid production before the stimulation operation is 2.5t; the daily oil production is 2.0t.

[0076] 2. Prepare the combination liquid

[0077] According to the inner diameter of the casing obtained in step 1 and the height from the bottom of the well to the target layer, the volume of the casing annulus is calculated. According to the volume of the casing annulus obtained, it can be known that the component A solution that can be prepared in this oil well is 650 kg, and its composition and The ratio is 47.0% ammonium nitrate NH 4 NO 3 , 22.0% etha...

Embodiment 2

[0090] Embodiment 2: No. 2 oil test in Yanchang Oilfield

[0091] 1. Investigate the geological conditions and wellbore structure of No. 2 oil well

[0092] Investigate the well structure during the operation of the present invention, and learn the geological conditions and well structure of No. 2 oil well: the reservoir belongs to sandstone and siltstone; medium-porous low-permeability oil layer; casing inner diameter The well depth is 1380.6m; the perforation range is 1282.0-1309.2m; the daily fluid production before the stimulation operation is 3.0t; the daily oil production is 2.5t.

[0093] 2. Prepare the combination liquid

[0094] According to the inner diameter of the casing obtained in step 1 and the height from the bottom of the well to the target layer, the volume of the casing annulus is calculated. According to the obtained volume of the casing annulus, it can be known that the oil well needs to prepare 650 kg of component A solution, and its composition and pro...

Embodiment 3

[0107] Embodiment 3: the test of No. 3 oil well in Yanchang Oilfield

[0108] 1. Investigate the geological conditions and wellbore structure of No. 3 oil well

[0109] Investigate the well body structure when the present invention operates, the geological conditions and the well body structure of No. 3 oil wells: the reservoir belongs to sandstone and siltstone; low porosity and low permeability oil layer; casing inner diameter The well depth is 1217.6m; the perforation range is 1143.3-1174.0m; the well was an abandoned oil well before the stimulation operation, and the daily oil production was 0t.

[0110] 2. Prepare the combination liquid

[0111] According to the inner diameter of the casing obtained in step 1 and the height from the bottom of the well to the target layer, the volume of the casing annulus is calculated. According to the obtained volume of the casing annulus, it can be known that the oil well needs to prepare 650 kg of component A solution, and its compos...

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Abstract

The invention provides a method and a combined solution for increasing productivity of a low-porosity, low-permeability and low-pressure reservoir oil well and relates to oil production technology. The method specifically includes: according to the hole volume of an operating well, calculating using quantity and proportion of a component A solution and a component B solution which are needed, and preparing the component A solution and the component B solution; sequentially adding the component A solution and the component B solution into the oil well for chemical reaction to increase productivity of the oil well, wherein the component A solution comprises nitric acid-alcohol complex, hydrazine, ammonium nitrate and water, and the component B solution comprises hydrazine nitrate, tetrachloroethylene, sodium hydride and sodium aluminum hydride. Physical and chemical effect, on a near-wellbore area of the oil well, of the chemical reaction between working solutions and between the working solutions and rock strata can be utilized to increase porosity, permeability, kinetic energy, heat energy and fluidity of a production layer so as to increase productivity of the oil well. The method integrates comprehensive effect, on oil-gas reservoirs, of physical and chemical processes and is simple in technique, controllable in process, low in cost and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method and a combined liquid group applied to the production capacity of low-porosity, low-permeability and low-pressure oil reservoirs. Background technique [0002] In my country, the "three low" oil reservoirs are widely distributed in various oil and gas regions across the country, especially in the Ordos Basin, and the geological reserves are large, accounting for about 1 / 3 of the country's total geological reserves. This type of oil reservoir is the main one. Reservoir characteristics of "three low" reservoirs: poor physical properties and low natural productivity. At present, the commonly used stimulation technologies for such reservoirs mainly include hydraulic fracturing technology, intralayer explosion technology, and acidizing technology. [0003] Hydraulic fracturing technology, injecting high-pressure water exceeding the fracture pressur...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/26C09K8/592C09K8/524
Inventor 景建坤胡鸿王甜刘小江卢双龙
Owner YANAN SHUANGFENG PETROLEUM TECH CO LTD
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