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Silicate scale clearing agent for ternary combination flooding extraction well

A ternary composite and silicate technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of production current fluctuations, broken rods, rises, etc., and achieve the effect of ensuring construction effect and quality

Active Publication Date: 2010-03-17
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
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Effect test

Embodiment 1

[0017] Embodiment 1. Determination of the oil washing rate of the pre-liquid of different concentrations of SYQ-II: the washed and dried quartz sand is mixed with the crude oil and bentonite of the ternary compound flooding block of Daqing Oilfield in a mass ratio of 10:5:1. Made of oil sands. Take 50ml of pre-liquid containing different concentrations of SYQ-II and add it to a plastic beaker, keep constant temperature for 30min, add 5g of oil sand, react for 3h, remove the solution, air dry, weigh, and the oil washing rate is calculated by 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] Pre-liquid static oil wash rate Table 1

[0025] SYQ-II con...

Embodiment 2

[0027] Example 2. Determination of scale removal rate of detergents with different concentrations of HF acid: 12% hydrochloric acid, 2% glacial acetic acid, 0.2% citric acid, 0.5% imidazoline corrosion inhibitor were used in a 100ml plastic beaker (YC-II) and the remaining amount of water to prepare 50ml of the detergent main agent of different concentrations of hydrofluoric acid. The above items are all in mass percentage. Take about 500g of the scale sample from the ternary block of South 5th block of Daqing Oilfield, put it in an oven at 115°C for 3 hours, take it out and put it in a desiccator and cool it to room temperature. In different concentrations of the detergent, react for 3h, then filter, put it in a 115 ℃ oven to dry for 3h, take it out and cool it to room temperature in a desiccator, weigh the weight of the scale sample 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 production in oil fields, in particular to a scale remover for insoluble silicate scale in ternary compound flooding oil wells. Background technique: [0002] At present, ASP flooding technology is an important means to further enhance oil recovery in the later stage of high water cut in Daqing Oilfield. With the injection of the ternary system, the silicate scaling in the production well becomes more and more serious. The scale removal rate of common scale cleaners for silicate scale is very low, only about 50%. If the silicon cannot be removed effectively The 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 the occurrence of pump stuck, broken rod and other phenomena, which will seriously affect the normal production of the oil field and the ternary compo...

Claims

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Application Information

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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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