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A hybrid heat release and plugging removal method for carbonate cemented sandstone heavy oil wells

A carbonate and heat release technology, applied in drilling compositions, chemical instruments and methods, earthwork drilling, etc. The effect of liquid and residue flowback, enhanced oil recovery, and increased seepage radius

Active Publication Date: 2019-11-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the acidizing technology has made great progress, but so far there is no effective heat-tracing acid-dissolving technology that utilizes the chemical exothermic reaction in the whole process of acidizing operation, and the physical heat-steam heating technology after acidizing is mostly used. Targets for sticky and acid-soluble minerals

Method used

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  • A hybrid heat release and plugging removal method for carbonate cemented sandstone heavy oil wells
  • A hybrid heat release and plugging removal method for carbonate cemented sandstone heavy oil wells
  • A hybrid heat release and plugging removal method for carbonate cemented sandstone heavy oil wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Well G54-X4 acidizing design and implementation effect

[0038] Implementation of acidification transformation layer: Sha 1 member; well section: 1086.9m ~ 1100.9m.

[0039] 1 Basic data of oil wells and basic conditions of acidizing intervals

[0040] 1.1 Basic drilling data, as shown in Table 1.

[0041] Table 1

[0042]

[0043] 1.2 Reservoir data, as shown in Table 2.

[0044] Table 2

[0045] layers Well section m Sand thickness m Permeability 10 -3 μm 2

Actual well section m Actual thickness m Acoustic time difference μs / ft ES11 1086.9-1127.8 40.9 21.754 1086.9-1094 7.1 81-112 ES11 1086.9-1127.8 40.9 21.754 1097.3-1100.6 3.3 85-112 ES11+2 1086.9-1127.8 40.9 21.754 1102.3-1110.9 8.6 58-107

[0046] 2 Operation situation and construction purpose

[0047] 2.1 Operation situation

[0048] The well was put into production for PS sand control on May 11, 2004, and a total of 21.6 cubic m...

Embodiment 2

[0105] Example 2 Mixed heat release and plugging removal method for carbonate cemented sandstone heavy oil wells

[0106] Proceed as follows:

[0107] a. Heating the wellbore (heating for 6 hours) (electric heating) to reduce the viscosity of the heavy oil in the wellbore and near the wellbore (within the radius of the wellbore edge 1-2m);

[0108] b. Inject the pre-fluid (pickling well wall) into the wellbore, and then add the main fluid; the volume of the injected main fluid is 1.2 times the volume of the downhole tubing being replaced;

[0109] The pre-fluid is a light compound amino acid;

[0110] The main liquid is composed of light compound chloro-based acid and heat-releasing polyfluorine plugging agent in a volume ratio of 1:1. Heat-following and heat-peeling oil film attachment, lightly mixed chlorine-based acid slowly acid-dissolves carbonates, prevents large particles of carbonates from dissolving and falling off, causing particles to migrate to form "bridge plugg...

Embodiment 3

[0121] Example 3 Mixed heat release and plugging removal method for carbonate cemented sandstone heavy oil wells

[0122] Proceed as follows:

[0123] a. Heating the wellbore (heating for 8 hours) (closed thermal fluid circulation heating) to reduce the viscosity of the heavy oil in the wellbore and near the wellbore (within the radius of the wellbore edge 1-2m);

[0124] b. Inject the pre-fluid (pickling well wall) into the wellbore, and then add the main fluid; the volume of the injected main fluid is 1.3 times the volume of the downhole tubing being replaced;

[0125] The pre-fluid is a light compound amino acid;

[0126] The main liquid is composed of light compound chloro-based acid and heat-releasing polyfluorine plugging remover in a volume ratio of 0.8:1.2, and the injection method is: alternately inject light compound chloro-based acid and heat-releasing poly Heat-following and heat-peeling oil film attachment, lightly mixed chlorine-based acid slowly acid-dissolves...

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Abstract

The invention discloses a hybrid heat-release and blockage-relieving method for a carbonate-cemented sandstone heavy oil well. The method comprises the following steps that firstly, a shaft is heated,so that the viscosity of the heavy oil in the shaft and near the shaft is reduced; secondly, a prepad fluid is injected into the shaft, and then a main fluid is added; thirdly, a subsequent fluid isinjected, and then a displacement fluid is injected; fourthly, raffinate flows back, wherein flowback is conducted at a low speed, and the acidification time is 16 hours or above; fifthly, oil is pumped and extracted by using an electric heating rod pump. By means of the method, the problem that an existing conventional acidification method is not suitable for acidification of a heavy oil layer issolved, a hybrid heat-release technology is adopted, while the rheological property of crude oil is improved, an oil film on the surface of carbonate cement is stripped, the contact area of the carbonate cement and the acidizing fluid is increased, the acid-rock reaction temperature is increased through chemical heat release, the exsolution effect of the adopted main acidizing fluid on the carbonate cement is given full play to, the success rate of the measure and the acidification valid period are improved, and therefore, the recovery efficiency of high-permeability heavy oil reservoirs, therecovery efficiency of middle-permeability heavy oil reservoirs and even the recovery efficiency of part of low-permeability heavy oil reservoirs can be improved.

Description

technical field [0001] The invention relates to a method for acidizing and plugging removal of production wells in heavy oil reservoirs, in particular to a method for removing plugging by mixing and releasing heat for carbonate cemented sandstone heavy oil wells such as (iron) calcite and (iron) dolomite. Background technique [0002] Thermal recovery of heavy oil is a hot and difficult point in the field of oil and gas exploitation. How to efficiently and rationally exploit oil layers with high bitumen and wax content and improve the recovery of heavy oil reservoirs is a key issue facing my country's continental oil and gas exploitation. The cause of oil well plugging is the result of the joint action of organic plugging and inorganic plugging. The organic plugging is mainly heavy components of crude oil such as asphaltene. The heavy components of crude oil containing a large amount of colloids and asphaltenes are driven by steam to migrate to the near-wellbore zone of oil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B43/24C09K8/528
CPCC09K8/528E21B43/24E21B43/25
Inventor 滕建彬张守鹏刘宝军李博方正伟黄志宏谢忠怀刘宁王伟庆张存霞王敏张秋实
Owner CHINA PETROLEUM & CHEM CORP
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