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Silicate scale clearing agent for ternary combination flooding extraction well

A ternary compound and silicate technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of production current fluctuation, rise, broken rod, etc., and achieve the effect of ensuring construction effect and quality

Active Publication Date: 2012-05-16
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the injection of the ternary system, the phenomenon of silicate scaling in production wells is becoming more and more serious. The scale removal rate of ordinary scale removers on silicate scale is very low, only about 50%. Salt scale will increase the load of the production well, the production current will fluctuate and increase, and the continuous scaling of the pump and rod pipe will eventually lead to pump jamming and rod breakage, which will seriously affect the normal production and ternary compounding of the oil field. overall economic benefit

Method used

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  • Silicate scale clearing agent for ternary combination flooding extraction well
  • Silicate scale clearing agent for ternary combination flooding extraction well
  • Silicate scale clearing agent for ternary combination flooding extraction well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. Determination of the oil washing rate of pre-flush with different concentrations of SYQ-II: Mix the washed and dried quartz sand with the crude oil and bentonite in the ASP flooding block of Daqing Oilfield with a mass ratio of 10:5:1. Made into oil sands. Take 50ml of pre-liquid containing different concentrations of SYQ-II and add it to a plastic beaker, keep the temperature constant for 30 minutes, add 5g of oil sand, react for 3 hours, remove the solution, dry it in air, weigh it, and calculate the oil washing rate according to the following formula. The experimental results are shown in Table 1

[0018] Calculation formula of oil washing rate:

[0019] R=[(W 1 -W 2 ) / W 0 ]×100%

[0020] In the formula: R-oil washing rate, %;

[0021] W 1 - mass of oil sand before reaction, g;

[0022] W 2 - mass of oil sand after reaction, g;

[0023] W 0 - mass of oil before reaction, g.

[0024] Prefluid static oil washing rate Table 1

[0025] ...

Embodiment 2

[0027] Example 2, Descaling rate measurement of descaling agents with different concentrations of HF acid: use 12% hydrochloric acid, 2% glacial acetic acid, 0.2% citric acid, 0.5% imidazoline type corrosion inhibitor in a 100ml plastic beaker (YC-II) and the rest of the water to prepare 50ml of descaling agent with different concentrations of hydrofluoric acid. The above items are all calculated by mass percentage. Take about 500g of scale samples from the South 5 Sanyuan Block of Daqing Oilfield, dry them in an oven at 115°C for 3 hours, take them out and cool them in a desiccator to room temperature, weigh 6 parts of 5g±0.1g scale samples, and add them to the above preparation React for 3 hours, then filter, dry in an oven at 115°C for 3 hours, take it out and cool it to room temperature in a desiccator, weigh the weight of the scale after the reaction, and calculate the scale according to the following formula The experimental results are shown in Table 2.

[0028] ...

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Abstract

The invention discloses a silicate scale clearing agent for a ternary combination flooding extraction well. The silicate scale clearing agent consists of prepad fluid and scale clearing main agent. The prepad fluid consists of 6% of additive (SYQ-II) and the balance of water. The additive (SYQ-II) consists of sodium dodecyl benzene sulfonate (ABS), nonyl phenol polyethenoxy ether (OP10) and ethylene glycol monobutyl ether with the ratio of 3:1:2. The scale clearing main agent consists of 12% of hydrochloric acid, 10% of hydrofluoric acid, 2% of glacial acetic acid, 0.2% of citric acid, 0.5% indoor-synthesized imidazoline type corrosion inhibitor (YC-II) and the balance of water. The scale clearing agent achieves a silicate scale clearing rate up to 80%, and can effectively clear silicate scale at an oil well pump cylinder, a rod pipe and other positions and prolong the pump examination period of the extraction well.

Description

Technical field: [0001] The invention relates to a scale remover in the field of oil recovery, in particular to a scale remover used for insoluble silicate scale in three-element compound flooding wells. Background technique: [0002] At present, the ASP flooding technology is an important means to further enhance the oil recovery in the late stage of high water cut in Daqing Oilfield. With the injection of the ternary system, the phenomenon of silicate scaling in production wells is becoming more and more serious. The scale removal rate of ordinary scale removers on silicate scale is very low, only about 50%. Salt scale will increase the load of the production well, the production current will fluctuate and increase, and the continuous scaling of the pump and rod pipe will eventually lead to pump jamming and rod breakage, which will seriously affect the normal production and ternary compounding of the oil field. The overall economic benefits of driving. Invention content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528C09K8/524
Inventor 周万富王鑫王庆国管公帅方晓红
Owner PETROCHINA CO LTD
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