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Long-acting augmented injection method for ultra-low permeability reservoir water injection well

A technology for water injection wells and ultra-low permeability, which is applied to chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve the problems of high cost of measures, short validity period, high treatment cost, etc., and can achieve pressure increase range. The control is adjustable, the overall operation is convenient, and the dosing concentration is stable.

Pending Publication Date: 2021-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem of under-injection of water wells, measures were taken to increase injection. The main way of increasing injection is acidification, supplemented by acid fracturing and fracturing measures. However, the effect on some blocks is not very obvious, and there are problems of short validity period and low efficiency of the measures. And there is secondary damage in the reservoir
At the same time, the cost of the injection measures is high, and the damage to the reservoir after multiple measures is large, which is not conducive to the efficient development of the reservoir.
It is very difficult to treat under-injection wells that are ineffective for multiple measures to increase injection, which affects the production of surrounding oil wells, and the cost of treatment is high, and the effective period becomes shorter and shorter with the increase of the number of measures
[0003] Therefore, in order to solve the under-injection wells in the prior art where multiple measures for increasing injection are ineffective, the present invention provides a long-term increasing injection method for water injection wells in ultra-low permeability reservoirs

Method used

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  • Long-acting augmented injection method for ultra-low permeability reservoir water injection well

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A long-term injection well injection method for ultra-low permeability reservoirs, comprising the following methods

[0026] S001: firstly select a number of under-injection wells that have performed too many rounds of measures to increase injection and still under-inject;

[0027] S002: Carry out water injection to under-injection well, adopt pressure boosting device to pressurize the incoming water of water injection and add comprehensive pressure control medicament;

[0028] S003: According to the pressure rise of under-injection wells, mix the comprehensive pressure-controlling agent aqueous solution with the required concentration, inject the aqueous solution mixed with comprehensive pressure-controlling agents into the selected under-injection wells after pressurization, and the injection displacement of the pressurization device by 100m 3 / d to 300m 3 / d, the boost range is less than or equal to 10MPa.

[0029] Further, in the S003, for the under-injection wel...

Embodiment 2

[0034] Further, the booster device includes a centrifugal booster water injection pump and a dosing device, the centrifugal booster water injection pump and the dosing device are integrally skid-mounted on the same skid, and the outlet pipe of the centrifugal booster water injection pump After the pipeline merges with the drug delivery pipeline of the drug dosing device, it leads into the under-injection well.

[0035] Further, the centrifugal booster water injection pump adopts a centrifugal booster water injection pump with an inlet pressure of 15-20MPa, an outlet pressure of 25-30MPa, a medium temperature of ≤80°C, a power supply voltage of 380±5%V, and a frequency of 50Hz.

[0036] Further, the dosing device is a dosing tank, the dosing tank is provided with a stirring tank, a tank body, and a pressure sensor, and the medicine outlet of the dosing tank is provided with a diaphragm metering column for controlling the amount of the integrated pressure control medicine Plug p...

Embodiment 3

[0040] Further, the comprehensive pressure control agent in S002 is based on a mass fraction of 100%, and the raw material composition of the comprehensive pressure control agent includes 10% amphoteric surfactant, 12%-15% stripping dispersant, 20%- 24% chelating agent, 15%-18% wetting agent, 8%-12% solubilizer, and the rest is water.

[0041] Further, described amphoteric surfactant is mainly betaine type surfactant, and described betaine type surfactant is octadecyl propyl hydroxysulfobetaine, and its effective content is 40%.

[0042] Further, the stripping dispersant is polyamino polyether group methylene phosphonic acid, and its active ingredient content is 60%.

[0043] Further, the chelating agent is aminotriacetic acid, and its active ingredient content is 99%.

[0044] Further, the wetting agent is glycerol polyoxyethylene ether GE-8, its active ingredient content is 99%, and its hydroxyl value is 350-420.

[0045] Further, the solubilizer is nonylphenol polyoxyethy...

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Abstract

The invention relates to the technical field of oilfield flooding development, in particular to a long-acting augmented injection method for a water injection well of an ultra-low permeability reservoir. The method comprises the following steps: for an under-injection well which is still invalid after multiple measures are implemented, firstly ensuring sufficient water injection by adopting a local pressurizing augmented injection mode, and then adding a comprehensive pressure control medicament according to the pressure rising amplitude of the under-injection well. Long-term stable water injection of the water injection well is ensured. The invention further provides raw material composition of the comprehensive pressure control agent. The comprehensive pressure control agent is preparedfrom 10% of ampholytic surfactant, 12%-15% of stripping dispersant, 20%-24% of chelating agent, 15%-18% of wetting agent, 8%-12% of solubilizer and the balance water. Under the adding concentration of0.2%, the reagent testing performance is as follows: the pH value is 6.0, the calcium carbonate scale stripping rate is 88.7%, the surface tension is 25.2 N / mN, the interfacial tension is 3.5 * 10 <-2 > N / mN, and the corrosion rate is only 0.049 mm / year. The method is well applied on site, and is an effective means for solving the problem that wells are invalid due to multiple measures in the ultra-low permeability reservoir.

Description

technical field [0001] The invention relates to the technical field of water injection development in oil fields, in particular to a method for long-term increased injection of water injection wells in ultra-low permeability reservoirs. Background technique [0002] Changqing Oilfield is characterized by low porosity and low permeability. With continuous development, the reservoir development target has gradually changed from low permeability reservoirs to ultra-low permeability and ultra-low permeability reservoirs. The development difficulty is increasing, and more than 90% of the The development method is still water injection development, and there are problems of underinjection in water injection, mainly due to factors such as poor reservoir physical properties, scaling near the wellbore, and incompatibility between injected water and formation water. Aiming at the problem of under-injection of water wells, measures were taken to increase injection. The main way of incr...

Claims

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Application Information

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IPC IPC(8): E21B43/20E21B43/22C09K8/58C09K8/584C09K8/588
CPCE21B43/20E21B43/16C09K8/58C09K8/584C09K8/588
Inventor 王尔珍姬振宁张随望陆小兵王勇邓志颖隋蕾唐泽玮杨玲智胡改星
Owner PETROCHINA CO LTD
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