Wet filtrate reducer
A water loss reducing agent and wet mixing technology, applied in drilling equipment, etc., can solve problems such as complicated process, uneven mixing, poor cementing quality, etc., and achieve the effect of improving cementing quality and controlling water loss
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Embodiment 1
[0027] Example 1. Well Wang 3 is an exploration well drilled by Daqing Drilling Company in the Jiamusi area. The variable density logging result of this well is a high-quality well. After the casing is run, the mud is circulated. The pressure was as high as 12.5MPa. The analysis reason was caused by the shrinkage of the well wall and the large amount of sand in the downhole. Therefore, there was no cementing on that day, and the mud continued to circulate. However, the situation did not improve the next day. I was worried that there would be complicated accidents, and the plan 1 in the above table was adopted. The prepared wet-mix fluid loss reducer was used for flow-limited cementing, and the construction was successful. When the mud was replaced by double pumps, the pump pressure rose to 20MPa, and then a single pump was used to replace the mud. The compressive strength of the cement was 25.5MPa for 48 hours. The compressive strength of fluid loss reducer is 24.7MPa. Therefor...
Embodiment 2
[0028] Example 2: Well Gu 148 is an exploration well in the Gulong area in the west of Changyuan, Daqing. The depth of the well is 1775 meters, the sealing height is 895 meters, the casing depth is 1771.23 meters, and a high-pressure layer appears at 1722.4 meters. The pore pressure coefficient can reach up to 1.40. Increased the difficulty of stabilizing the stratum to prevent water and gas channeling; apply the wet-mix fluid loss reducer formulated in Scheme 2 above, the cement slurry will form a higher gel strength, and generate enough anti-channeling resistance to prevent the occurrence of water and gas channeling. The water loss is controlled at 100ml, and the 48h compressive strength is 26.5MPa; the sound amplitude test after cementing is of high quality, which proves that the cementing quality is good with this wet mixing fluid loss reducing agent.
Embodiment 3
[0029] Example 3: Well Ying 39 is an exploratory well in the Yingtai area in the west of Daqing. The well is 2180 meters deep, the sealing height is 1100 meters, and the fracture pressure of the formation is low at 1760-1870 meters. The wet-mixed fluid loss reducer prepared in the scheme 3 of the above table is used , in order to prevent formation leakage during cementing, the cement slurry density is controlled at 1.60g / cm 3 , 48h compressive strength is 26.7MPa; improve the stability of cement slurry. The safe construction of cementing is guaranteed, and the quality of logging and sealing after cementing is high quality.
[0030] From the comprehensive analysis of the above data, the developed wet-mix fluid loss reducer has the advantages of sufficient hydration of cement stone, controlling the water loss of cement slurry within 100ml, improving the bonding strength and ensuring the quality of cementing.
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Abstract
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