A plugging method for mid-deep wells using a plugging agent capable of delaying water absorption and expansion
A technology of delayed expansion and plugging method, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as unachievable, good plugging effect, etc., and achieve the effect of less leakage
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Embodiment 1
[0027] Using a 1mm wedge to simulate the leakage velocity in the formation of the leakage section: 5m 3 / h≤leakage velocity≤15m 3 / h well condition. The specific simulation test process is as follows:
[0028] S1. Determine the formula of the plugging agent: 2000mL base slurry is prepared by default. According to the leakage rate, the formula of the corresponding plugging agent is shown in Table 1 below.
[0029] Table 1:
[0030]
[0031] S2. Prepare 5wt.% bentonite base slurry to replace the drilling fluid at the plugging site to facilitate performance observation; specifically, prepare 2000mL of 5wt.% bentonite base slurry and hydrate it for 24 hours to control the viscosity of the base slurry at 40-55s Between (Martens funnel viscosity);
[0032] S3. Add the plugging agents 1-3 prepared in step S1 to the base liquid prepared in step S2 respectively, stir on a multi-speed strong agitator for 45 minutes, add NaOH to adjust the pH of the mixed solution between 10-11, a...
Embodiment 2
[0055] Use a 3mm wedge to simulate the leakage velocity of the formation in the leakage section ≥ 15m 3 / h well condition.
[0056] Step 1. Preparation of plugging slurry: 2000mL of base slurry is prepared by default. According to the leakage rate, the formula of the corresponding plugging agent is shown in Table 4 below.
[0057] Table 4:
[0058]
[0059] S2. Prepare 5wt.% bentonite base slurry to replace the drilling fluid at the plugging site to facilitate performance observation; specifically, prepare 2000mL of 5wt.% bentonite base slurry and hydrate it for 24 hours to control the viscosity of the base slurry at 40-55s Between (Martens funnel viscosity);
[0060] S3. Add the plugging agent prepared in step S1 to the base liquid prepared in step S2, stir on a multi-speed strong mixer for 45 minutes, add NaOH to adjust the pH of the mixed solution between 10 and 11, and obtain a mixture with a certain viscosity The degree of plugging slurry is 7~9;
[0061] S4. Press...
Embodiment 3
[0069] Using the test method of plugging ability of sand bed, the leakage rate of the simulated leakage formation is less than 5m 3 / h leakage status.
[0070] Step 1. Prepare plugging slurry:
[0071] The pre-prepared base slurry is 2000mL. According to the simulated leakage velocity, the formula of the corresponding plugging agent is shown in Table 6 below.
[0072] Table 6:
[0073]
[0074] S2. Use the drilling fluid used on the construction site as the base slurry, and add an appropriate amount of glue to adjust the viscosity of the base slurry between 40 and 55s (Martens funnel viscosity);
[0075] S3. Add the leak-stopping agent 10-12 prepared in step S1 to the base liquid prepared in step S2, stir at a high speed on a multi-speed strong agitator for 20 minutes, add NaOH to adjust the pH of the mixed solution between 10-11, and obtain Plugging slurry with a certain viscosity 10-12;
[0076] S4. Sand bed capacity test:
[0077] Take 20-40 mesh sand and put it in ...
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