On-site construction process of water base barite liquid plugging agent with heat sensitive characteristic
A technology for on-site construction and loss-stopping agent, applied in drilling compositions, wellbore/well components, chemical instruments and methods, etc. problems, to achieve the effect of increasing flow resistance, simple construction process, and improving the effect of plugging
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Embodiment 1
[0034] The invention discloses an on-site construction process of a water-based barite liquid plugging agent with heat-sensitive properties. The steps include:
[0035] a. Lower the drilling tool to the target well depth, rotate the drilling tool at a speed of 30 rpm, and pump in the required amount of plugging slurry;
[0036] b. When the plugging slurry returns to the drill tool outlet, pull out the drill tool at a speed of 10 m / min;
[0037] c. Waiting for more than 30 hours;
[0038] d. After the plugging is completed, shut down the well and test the pressure; if the pressure does not meet the requirements, repeat the construction steps a-c, and add 5% bridge plugging agent according to the mass percentage of the plugging slurry while pumping the plugging slurry, until the pressure reaches the requirement. This technology was applied to Well Longgang 001-27 to form a barite plug at a depth of 4680-4650m, which solved the complicated problems of brine spit from the upper ...
Embodiment 2
[0040] On the basis of Example 1, this process is especially suitable for on-site construction of the following leakage plugging slurry:
[0041] The formula of the plugging slurry mentioned in step a in Example 1 is as follows in terms of mass percentage: 23%-31.2%; zinc stearate: 0.3%-0.6%; sulfonated tannin extract for drilling fluid: 0.5%-0.6% ; Barite powder: 68%-75.8%.
[0042] The preparation method is as follows: according to the above ratio, first put tap water accounting for half of the ratio in the mud tank of the well, then add all the zinc stearate, all the sulfonated tannin extract and all the barite powder in order, and stir 1-2 hours, then add the remaining tap water, which accounts for the other half of the proportion, and stir for another 2-3 hours.
[0043] The tap water mentioned refers to the water that meets the requirements of GB5749-85 urban tap water. Said zinc stearate adopts standard number as said zinc stearate in HG / T 3667-2000 file. Said sulfon...
Embodiment 3
[0045] As a preferred embodiment of the present invention, in the step b, when the lost circulation slurry returns to the outlet 2 of the drilling tool, the drilling tool is pulled up at a speed of 10 m / min. In the step b, after the plugging slurry is completely replaced by the drilling tool, the drilling tool is raised to 50 meters above the liquid level of the plugging slurry. In the step c, the waiting plugging adopts low pressure waiting plugging or no low pressure waiting plugging, and low pressure waiting plugging refers to: when the low pressure condition is met, the well is shut down and the low pressure is 1.0MPa waiting for plugging; Waiting for blockage under low pressure refers to: when the conditions for low pressure are not met, wait for blockage at rest. In the step d, the bridge plugging agent refers to a commonly used thin bridge plugging agent. All the other are with embodiment 1 or 2.
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