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A method to improve the effect of self-generated CO2 regulation and flooding in multiple layers

A layer-by-stage, self-generated technology, which is applied in earthwork drilling, wellbore/well components, and production fluids, etc., can solve problems such as limited control and drive capacity, poor control and drive effect, failure, etc., to achieve easy availability of raw materials and low cost The effect of low cost and simple construction process

Active Publication Date: 2021-05-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first round of intralayer self-generated CO 2 Modulation and flooding can effectively adjust the diversion rate of heterogeneous reservoirs and greatly increase oil recovery. 2 Most of the solution enters the hyperpermeable layer, which will further aggravate the heterogeneity of the reservoir, making the second and third rounds of self-generated CO 2 Most or even all of the control and flooding solution enters the high-permeability layer, and cannot act on the medium-low permeability layer with a lot of remaining oil, so the effect of the second and third rounds of control and flooding will rapidly deteriorate or even fail

Method used

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  • A method to improve the effect of self-generated CO2 regulation and flooding in multiple layers
  • A method to improve the effect of self-generated CO2 regulation and flooding in multiple layers
  • A method to improve the effect of self-generated CO2 regulation and flooding in multiple layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068]Select the No. 1 core, the segmentation is injected into the 1PV layer2The drive system, each segment is in sequentially 0.125PV agencies (10 wt.% Sodium carbonate), 0.0125PV, 0.0125 pV, 0.0125 pV, 0.0125 pV, hydrochloric acid + 1.0 wt.% Α-olefin sulfonate + 1.0 wt.% Oilfield Mid-temperature corrosion inhibitor IS-130, ie fused ring aromatic hanammonium salt, from China Sea Oil Suit Chemical Company) and 0.0125PV Stabilizer (0.4 wt. % Of the sea water-soluble moiety hydrolyzed acrylamide, the hydrolysis is 5%, the average molecular weight is 12 million, derived from the CNOTC Chemical Company), a total of four sections; subsequent water drive to a water content of 98%;

[0069]The 0.1PV starch gum (3 wt.% Hydroxypropyl starch + 5 wt.% Acrylamide + 0.05 wt.% N, N'-methylene double acrylamide + 0.01 wt.% Of potassium sulfate + 0.001% wt.% Sodium sulfate;

[0070]Re-segmentation injecting 1PV layer2The drive system, each segment is in sequentially 0.125PV agencies (10 wt.% Sodium carbo...

Embodiment 2

[0073]Select 2 cores, segmented plug into 1PV layer2The floppy system, each segment is in sequential in sequence in sequence, in order, in order, 0.0125PV, 0.0125 pV, 0.0125 pV, 0.0125 pV, hydrochloric acid (15 wt.% Hydrochloric acid) + 1.5 wt.% Α-olefin sulfonate + 1.5 wt.% Oleate hydroxyethyl imidazoline, from CNOOCCCs) and 0.0125PV stabilizers (0.5 wt.% Seawater-soluble moiety hydrolyzed) Polyacrylamide, hydrolysis is 3%, with an average molecular weight of 13 million, originated from China Sea Oil Society Chemical Company), a total of four sections; the subsequent water drive to a water content of 98%;

[0074]Inject 0.2PV starch gelatin (5.0 wt.% Hydroxypropyl starch + 5.0 wt.% Acrylamide + 0.10 wt.% N, N'-methylene bis acrylamide + 0.015 wt.% Sodium sulfate);

[0075]Re-segmentation injecting 1PV layer2The floppy system, each segment is in sequential in sequence in sequence, in order, in order, 0.0125PV, 0.0125 pV, 0.0125 pV, 0.0125 pV, hydrochloric acid (15 wt.% Hydrochloric acid) ...

Embodiment 3

[0078]Choose 3 core heart, the segmentation is injected into the 1PV layer2The drive system, each segment is in sequentially 0.125PV agencies (12 wt.% Sodium sodium carbonate), 0.0125 pv, 0.0125 pV, 0.0125 pV, 0.0125 pV, hydrochloric acid (12 wt.% Hydrochloric acid) + 1.0 wt.% Α-olefin sulfonate + 1.0 wt.% Of the Oilfield Mid-temperature corrosion inhibitor IS-130, that is, a fused ring aromatic hydrocarbon quarter ammonium salt, from China Sea Oil Suit Chemical Company) and 0.0125PV Stabilizer (0.3 wt. % Of the sea water-soluble moiety hydrolyzed acrylamide, the hydrolysis is 5%, the average molecular weight is 15 million, derived from the CNOTC Chemical Company), a total of four sections; subsequent water drives to a water content of 98%;

[0079]Inject 0.3PV starch gelatin (4.0 wt.% Hydroxypropyl starch + 4.0 wt.% Acrylamide + 0.05 wt.% N, N'-methylene double acrylamide + 0.01 wt.% Per-sulfate + 0.002% wt Sodium sulfate);

[0080]Re-segmentation injecting 1PV layer2The drive system, ea...

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Abstract

The invention discloses a method for improving self-generated CO in multi-round layers 2 The method of adjusting the drive effect. The method includes the following steps: (1) implementing multiple rounds of intralayer self-generated CO 2 Injection of starch glue into water injection wells of control and flooding measures; (2) self-generated CO 2 Adjustment and flooding agent system; (3) Restoration measure well water injection. The present invention can significantly enhance intralayer self-generated CO 2 The profile control ability of the control and flooding technology can effectively block the self-generated CO in multiple layers 2 The high-permeability zone formed after the control and flooding measures realizes the diversion of liquid flow and makes CO generation in subsequent layers 2 Most of the chemicals enter the middle and low permeability layers, so as to further activate the crude oil in the low permeability layers and improve the effect of control and flooding. This method can expand the intralayer autogenous CO 2 The applicability of the control and flooding technology, especially for the self-generated CO 2 The well group whose oil increase effect becomes worse after the control and flooding measures can self-generate CO in layers 2 On the basis of control and flooding, the recovery rate is increased by 6.11-14.05 percentage points, and CO is spontaneously generated in the second round of sub-layers. 2 On the basis of control and flooding, the recovery rate was increased by 10.50 percentage points.

Description

Technical field[0001]The present invention relates to a self-generating CO in a layer.2Improve the field of recovery technology, in particular, involving a self-generating CO in multi-wheel layers2Method of flushing effect.Background technique[0002]The Bohai Oilfield belongs to the sanding reservoir of the glued loose, multi-use, multi-lane-in-law development method, the contradiction between the layers and the layers, the water is serious, resulting in rapid yield, and the yield decreases. At the same time, due to the large investment of the sea platform, the life is short, the development model of strong attention is taken, the water injection intensity is large, the water quality is poor, resulting in high injection pressure, and the injection well is serious. Self-generating CO2The drive technology can utilize ventilators to effectively relieve inorganic clogging, and the reaction generated CO2The foam can block high hematch layers, inhibit water, therefore become an important m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/16
CPCE21B43/16E21B43/164
Inventor 李翔郑玉飞徐景亮
Owner CHINA NAT OFFSHORE OIL CORP