Method for plug removal of triassic oil reservoir in nitrogen foam acidification mode

A nitrogen foam, triassic technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of short validity period and poor effect, etc.

Active Publication Date: 2014-01-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Solve the problem of poor effect and short effective period of conventional acid...

Method used

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  • Method for plug removal of triassic oil reservoir in nitrogen foam acidification mode

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Effect test

Embodiment 1

[0024] A method for removing plugging by nitrogen foam acidification of a Triassic reservoir according to the present invention:

[0025] (1) 12% hydrochloric acid, 3% hydrofluoric acid, 0.8% sodium dodecyl sulfate, 0.3% polyacrylamide (molecular weight 13 million), 0.5% thiourea, 1% imidazoline, and the rest are water; on site Prepare the pre-fluid in the liquid distribution tank.

[0026] (2) Mix 8% hydrochloric acid, 1% hydrofluoric acid, 0.8% EL-23 type E foaming agent, 0.3% foam stabilizer D, 0.5% iron ion stabilizer EL-12, 1% corrosion inhibitor EL- 10 Prepare the working fluid in the liquid mixing tank, and the rest is water; the EL-23 foaming agent is a compound of cetyltrimethylammonium bromide and alkylphenol polyoxyethylene ether.

[0027] (3) 0.5% OP-10 and 1% clay stabilizer are prepared in the liquid mixing tank to make the post liquid, and the rest is water.

[0028] (4) The structure of the acidizing drilling tool from bottom to top consists of a sliding slee...

Embodiment 2

[0038] A method for removing plugging by nitrogen foam acidification of a Triassic reservoir according to the present invention:

[0039] (1) 10% hydrochloric acid, 1% hydrofluoric acid, 0.5% sodium dodecyl sulfate, 0.1% polyacrylamide (molecular weight 13 million), 0.3% thiourea, 0.5% imidazoline, and the rest are water; on site Prepare the pre-fluid in the liquid distribution tank.

[0040] (2) Mix 5% hydrochloric acid, 1% hydrofluoric acid, 0.5% EL-23 type E foaming agent, 0.1% foam stabilizer D, 0.3% iron ion stabilizer EL-12, 0.5% corrosion inhibitor EL- 10 Prepare the working fluid in the liquid distribution tank, and the rest is water. EL-23 foaming agent is a compound of cetyltrimethylammonium bromide and alkylphenol polyoxyethylene ether.

[0041] (3) 0.5% OP-10 and 1% clay stabilizer are prepared in the liquid mixing tank to make the post liquid, and the rest is water.

[0042] (4) The structure of the acidizing drilling tool from bottom to top consists of a slidi...

Embodiment 3

[0052] A method for removing plugging by nitrogen foam acidification of a Triassic reservoir according to the present invention:

[0053] (1) 11% hydrochloric acid, 2% hydrofluoric acid, 0.7% sodium dodecyl sulfate, 0.2% polyacrylamide (molecular weight 13 million), 0.4% thiourea, 0.8% imidazoline, and the rest are water; on site Prepare the pre-fluid in the liquid distribution tank.

[0054] (2) Mix 7% hydrochloric acid, 1% hydrofluoric acid, 0.7% EL-23 type E foaming agent, 0.2% foam stabilizer D, 0.4% iron ion stabilizer EL-12, 0.8% corrosion inhibitor EL- 10 Prepare the working fluid in the liquid distribution tank, and the rest is water. EL-23 foaming agent is a compound of cetyltrimethylammonium bromide and alkylphenol polyoxyethylene ether.

[0055] (3) 0.5% OP-10 and 1% clay stabilizer are prepared in the liquid mixing tank to make the post liquid, and the rest is water.

[0056] (4) The structure of the acidizing drilling tool from bottom to top consists of a sliding...

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Abstract

The invention relates to a method for plug removal of a triassic oil reservoir in a nitrogen foam acidification mode. The method comprises the steps that 3 steres of prepad fluid is injected in from a tool oil tube, a sliding sleeve matched steel ball is thrown, 12MPa pressure is applied to set a packer, and pressure is applied continuously to reach 16 MPa to open a sliding sleeve; the rest prepad fluid is squeezed into the triassis oil reservoir in the discharge capacity of 0.2-0.4m<3>/min from the tool oil tube, and nitrogen is mixed in the prepad fluid in the discharge capacity of 20m<3>/min; all working liquid is squeezed into the triassis oil reservoir from the tool oil tube in the discharge capacity of 0.2-0.4m<3>/min, and the nitrogen is mixed into the working liquid in the discharge capacity of 20m<3>/min; all prepad fluid is squeezed, and active water of the volume of the tool oil tube is squeezed; after 1 hour of shut-in reaction, open flow is controlled to be conducted. According to the method for the plug removal of the triassis oil reservoir in the nitrogen foam acidification mode, the reaction speed of foamed acid and rock is low, the loss of acid liquid is small, the penetration depth of the acid liquid can be better improved, and deep acidification is achieved; an oil-water layer can be selected, and temporary plug can be formed to a high permeability layer and a water layer so that the acid liquid can enter a low permeability layer and an oil layer; solid particles can be brought out of the ground.

Description

technical field [0001] The invention relates to a method for acidizing and plugging removal with nitrogen foam for Triassic low-permeability, low-pressure, acid-sensitive and water-sensitive oil reservoirs. Background technique [0002] Triassic reservoirs are typical low-porosity and low-permeability reservoirs. Drilling, cementing, and perforation operations are likely to cause damage to the reservoirs. Changes in well temperature, pressure and water injection quality may cause blockage of inorganic scales; In addition, if the flowback of fracturing fluid is not timely, its residue and filter cake are likely to cause damage in the deep. Conventional acidification measures have a small treatment radius, and the acid liquid is easy to rush into the cracks, high-permeability layer or water layer, resulting in excessive acidification of the high-permeability layer or water layer, resulting in rapid rise of water content after the measure, and short effective period of the meas...

Claims

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Application Information

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IPC IPC(8): E21B43/27C09K8/74
Inventor 张涛黎晓茸李安琪徐永高郭方元谭俊领贾玉琴杨棠英刘笑春石磊杨立华马丽萍
Owner PETROCHINA CO LTD
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