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
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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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