Fast slip casting technique between composite well wall

[0010] Example 1

[0011] As shown in Figure 1, the composite well wall is composed of an outer well wall 2, an inner well wall 4, and a plastic interlayer wall 3. The grouting pump 10 is fixed on the surface of the wellhead. Before grouting, the wellbore is grouted into sections according to the depth of the frozen wellbore, the thickness of the well wall, the strength, and the aquifer layer. Generally, the wellbore is divided into 1-4 grouting sections. The section height is generally 100-200m. When the inner shaft wall 4 is constructed, the vertical segmented grouting pipe 6 is preset and pre-embedded to match the height of the grouting segment, and the segmented grouting pipe 6 is set in it. In the well wall, preset and pre-embedded vertical segmented grouting pipes are carried out sequentially from above the wall seat 1 and upwards. The segmented grouting pipe 6 is provided with a number of grouting heads 5, the spacing of the grouting heads 5 is 5-7 meters, the grouting head 5 is connected with the plastic interlayer wall 3, and multiple grouting points are simultaneously formed in a section height . The upper end of each segmented grouting pipe 6 is connected to each segmented long slurry pipe 8. Each segmented slurry pipe is preset and pre-buried in the inner well wall 4 and passes through the wellhead to expose the ground. Each segmented slurry pipe 8 The exposed end of the ground is connected to the grouting pump 10 through a connecting hose 11. When grouting, the grouting pump is connected to each segmented grouting pipe on the ground, and segmented upward grouting is adopted. In order to ensure the grouting effect, the number of passes and positions of the segmented grouting pipe 6 are determined according to the diameter of the wellbore 9 and the grouting requirements. The number of passes is generally 2-3 passes, and the positions are evenly arranged on the circumference of the wellbore. An observation hole 7 is provided on the upper part of each grouting section. One end of the observation hole is connected with the plastic interlayer wall 3, and the other end is connected with the wellbore 9 for observing the grouting effect and controlling the grouting pressure.

[0012] Example 2

[0013] As shown in Figure 2, the composite well wall is composed of an outer well wall 2, an inner well wall 4, and a plastic interlayer wall 3. The grouting pump 10 is fixed on the suspension plate 13 in the wellbore 9. The suspension plate 13 is drawn by four suspension steel ropes 12. Before grouting, the wellbore is injected according to the depth of the frozen wellbore, the thickness of the well wall, the strength, and the aquifer layer. Grout segmentation, generally divide the wellbore into 2-3 grouting segments, and the segment height is generally 100-200m. When constructing the inner shaft wall 4, preset, pre-buried and grouting segment heights are compatible The vertical segmented grouting pipe 6 and the segmented grouting pipe 6 are arranged in the inner well wall 4, and the preset and pre-embedded vertical segmented grouting pipes are carried out from above the wall seat 1 and upward in sequence. The segmented grouting pipe 6 is provided with a number of grouting heads 5, the spacing of the grouting heads is 5-7 meters, and the grouting heads 5 are connected with the plastic interlayer wall 3, and multiple grouting points are simultaneously formed within a section height. The upper port of each segmented grouting pipe 6 exposes the inner well wall at the upper part of the remark slurry section and is connected with the short slurry pipe 8. The other end of the slurry pipe 8 is connected to the grouting pump 10 on the suspension plate through the connecting hose 11 Connect, perform grouting, after filling a section, lift the hanging plate and inject another section. In order to ensure the grouting effect, the number of passes and positions of the segmented grouting pipe 6 are determined according to the diameter of the wellbore 9 and the grouting requirements. The number of passes is generally 2-3 passes, and the positions are evenly arranged on the circumference of the wellbore. An observation hole 7 is provided on the upper part of each grouting section. One end of the observation hole is connected with the plastic interlayer wall 3, and the other end is connected with the wellbore 9 for observing the grouting effect and controlling the grouting pressure.