Method for evaluating scale inhibition performance of oil well shaft capsule scale inhibition particles on calcium carbonate scale

An evaluation method, the technology of calcium carbonate, is applied in the direction of material analysis through observation of the influence of chemical indicators, analysis through chemical reaction of materials, and preparation of test samples. No dirt particles and other problems, to achieve the effect of good promotion, strong operability and low requirements

Inactive Publication Date: 2020-02-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there is no domestic release of the evaluation method for the scale inhibition performance of capsule scale inhibitors used in oil well shafts on calcium carbonate scale.

Method used

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  • Method for evaluating scale inhibition performance of oil well shaft capsule scale inhibition particles on calcium carbonate scale
  • Method for evaluating scale inhibition performance of oil well shaft capsule scale inhibition particles on calcium carbonate scale
  • Method for evaluating scale inhibition performance of oil well shaft capsule scale inhibition particles on calcium carbonate scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a method for evaluating the scale inhibition performance of oil well wellbore capsule scale inhibitor particles on calcium carbonate scale, which includes the following steps:

[0051] Step 1) measure the salinity, calcium ion content and bicarbonate ion content of oilfield formation water;

[0052]Step 2) preparing A solution: preparing a solution having the same calcium ion content as the oilfield formation water with anhydrous calcium chloride, and adding sodium chloride to make the A solution have the same salinity as the oilfield formation water;

[0053] Prepare B solution: prepare a solution with the same bicarbonate content as the oilfield formation water with sodium bicarbonate, and add sodium chloride to make the B solution have the same salinity as the oilfield formation water;

[0054] Step 3) determine the mixing ratio of A solution and B solution;

[0055] Step 4) Add a certain volume of A solution into the Erlenmeyer flask, add a...

Embodiment 2

[0067] On the basis of Example 1, this example provides a method for evaluating the scale inhibition performance of oil well wellbore capsule scale inhibitor particles on calcium carbonate scale. The mixing ratio of A solution and B solution described in step 3) is determined as follows:

[0068] Use the scale scaling prediction software to input the ion content, pH value, temperature and pressure in solution A and solution B, according to the volume ratio of solution A: solution B = 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2, and 9:1 are used to predict the amount of scaling, and the mixing ratio corresponding to the maximum amount of scaling is the mixing ratio of solution A and solution B.

[0069] Generally, in the evaluation method of calcium carbonate scale anti-scaling rate, the mixing ratio of A solution and B solution is 1:1, but this is not consistent with the actual situation of oil field production. The maximum scaling should be obtained first according to the ion compo...

Embodiment 3

[0072] On the basis of Example 1, this example provides a method for evaluating the scale inhibition performance of oil well wellbore capsule scale inhibitor particles on calcium carbonate scale. The mixing ratio of A solution and B solution described in step 3) is determined as follows:

[0073] (1) Prepare 50ml, 100ml, 150ml, 200ml, 250ml, 300ml, 350ml, 400ml, 450ml of A solution respectively;

[0074] (2) Prepare 450ml, 400ml, 350ml, 300ml, 250ml, 200ml, 150ml, 100ml, 50ml of B solution respectively;

[0075] (3) Under the temperature and pressure of the simulated oilfield formation, mix respectively according to the corresponding order of solution A and solution B to obtain 9 groups of mixed solutions;

[0076] (4) Take a number of quantitative filter papers, dry to constant weight, record the quality G1 of each filter paper, filter each mixed solution in quantitative filter paper, place in a 105-degree oven and dry to constant weight, record the quality as G2, and calcula...

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Abstract

The invention provides a method for evaluating scale inhibition performance of oil well shaft capsule scale inhibition particles on calcium carbonate scale. The method comprises the following steps: simulating the composition of oilfield formation water, and respectively measuring the calcium ion concentration in a capsule scale inhibition particle added sample to be measured, the calcium ion concentration in a capsule scale inhibition particle not added sample to be measured and the calcium ion concentration in a capsule scale inhibition particle not added solution B blank sample to be measured under simulated formation conditions to obtain the calcium carbonate scale inhibition rate. The mixing ratio of a solution A to a solution B is determined through a precipitation method or scale scaling prediction software, so the method accords with the practical conditions of oilfield production; and an anti-scaling agent evaluated according to the ratio can be used in different development periods of a whole shaft or a gathering and transportation station. The method can scientifically guide the oil well shaft capsule scale inhibition particle filling technology, and has the advantages of simplicity in operation, low requirements on detection personnel, low detection cost, strong operability of oil production units, and facilitation of promotion.

Description

technical field [0001] The invention belongs to the technical field of chemical scale inhibition in oil field wellbore, and in particular relates to a method for evaluating the scale inhibition performance of oil well wellbore capsule scale inhibition granules on calcium carbonate scale. Background technique [0002] When oilfield injection water is rich in HCO3 - , the formation water is rich in Ca 2+ , due to the incompatibility of the two and factors such as temperature and pressure, a large amount of calcium carbonate scale is produced in the wellbore of the oil well, resulting in blockage of the perforation section of the oil well, failure of the pump valve, frequent pump inspection, etc., seriously affecting the normal production of the oil field. [0003] The traditional way to solve the problem of wellbore scaling is to inject liquid antiscalants from the wellhead directly downhole, but these antiscalants will soon flow away with the produced fluid or adhere to the ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/38G01N1/34G01N1/44
CPCG01N1/34G01N1/38G01N1/44G01N21/78
Inventor 刘爱华周志平李琼玮苑慧莹刘宁姜毅董俊
Owner PETROCHINA CO LTD
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