Repeated transformation method for improving crack plugging effect
A technology for repeated reconstruction and artificial fractures, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems such as failure to seal natural or artificial fractures, low bearing strength, and affecting oil well productivity
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Embodiment 1
[0039] This embodiment provides a repeated reconstruction method for improving the crack plugging effect, which includes the following steps:
[0040] Step 1) Prepare 10m 3 Differential pressure activates sealant A, 20m 3 The differential pressure activates sealant B;
[0041] Step 2) at 0.5-2.0m 3 / min inject 10m 3 Active water, low replacement and setting;
[0042] Step 3) at 2.0m 3 / min Inject 10m into the target layer 3 Cross-linking liquid carrying 2.0m 3 40-70 mesh quartz sand;
[0043] Step 4) at 2.0m 3 / min Inject 10m into the target layer 3 Differential pressure activates sealant A;
[0044] Step 5) at 2.0m 3 / min inject 20m 3 Differential pressure activates sealant B;
[0045] Step 6) at 2.0m 3 / min Inject guar base fluid to activate the sealant replacement into the formation by the pressure difference in the wellbore, and stop the pump for 1 hour;
[0046] Step 7) at 3.0m 3 / min Displacement, 300m 3 The amount of liquid entering the ground and 30m 3 ...
Embodiment 2
[0051] In order to make up for the shortcomings of conventional water plugging fracturing, this example provides this repeated reconstruction method to improve the effect of fracture plugging, including the following steps:
[0052] Step 1) Prepare 20m 3 Differential pressure activates sealant A, 30m 3 The differential pressure activates sealant B;
[0053] Step 2) at 0.5-2.0m 3 / min inject 15m 3 Active water, low replacement and setting;
[0054] Step 3) at 3.0m 3 / min Inject 15m into the target layer 3 The cross-linking solution carries 2.5m 3 40-70 mesh quartz sand;
[0055] Step 4) at 3.0m 3 / min Inject 20m into the target layer 3 Differential pressure activates sealant A;
[0056] Step 5) at 3.0m 3 / min injection 30m 3 Differential pressure activates sealant B;
[0057] Step 6) at 3.0m 3 / min Inject guar base fluid to activate the sealant replacement into the formation by the pressure difference in the wellbore, and stop the pump for 2 hours;
[0058] Step ...
Embodiment 3
[0061] A repeated reconstruction method for improving the sealing effect of cracks, comprising the following steps:
[0062] Step 1) Prepare 8m 3 Differential pressure activated sealant A, 22m 3 The differential pressure activates sealant B;
[0063] Step 2) at 0.5-2.0m 3 / min inject 10m 3 Active water, low replacement and setting;
[0064] Step 3) at 3.0m 3 / min Inject 20m into the target layer 3 Cross-linking liquid carrying 4.0m 3 40-70 mesh quartz sand;
[0065] Step 4) at 3.0m 3 / min Inject 8m into the target layer 3 Differential pressure activates sealant A;
[0066] Step 5) at 3.0m 3 / min inject 22m 3 Differential pressure activates sealant B;
[0067] Step 6) at 3.0m 3 / min Inject guar base fluid to activate the sealant replacement into the formation by the pressure difference in the wellbore, and stop the pump for 1 hour;
[0068] Step 7) at 3.0m 3 / min Displacement, 350m 3 The amount of liquid entering the ground and 35m 3 The construction parameter...
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