SU1043294A1 - Method of constructing filter-less wells - Google Patents

Description

The invention relates to the mining industry, and more specifically to the oil and gas production, and can be used in the construction of water intake filterless wells, in reality, in conditions of poorly stable creeping.

There is a known method of constructing Pesfiltr wells, which includes penetration and casing of a well, creating a water intake in a sandy formation, filling sand with subsequent injection into the free space between the roof and the sand of a hardening material, such as cement mortar, after which it is solidified. removing covered necKf l |

The disadvantage of the method is the inevitable drawdown of the artificial blood in the funnel, since sandy floors can be a reliable roof. The application of concentrated loads to their upper part causes sand entrainment and swimming of the pores, and, in addition, a change in the pumping mode causes deformation of the sandy slopes and exposure of the bearing surfaces of the artificial vault. This development is also facilitated by the development of a circular gap formed by high flow rates under the aperture. There is also a danger of breaking, cement stone in the junction of the vault with cement stone in the annulus, as well as in other sections (for example, with a radius of GO, i.e. at the casing (in the most loaded section, the thickness of the cement stone approaches to zero zngchiya, with g 1 m, h IL O; 18 m;

H P V:

The disadvantage of this method is the small radius of the auxiliary and, therefore, water intake funnel due to the weak stability of the clay roof, especially in the central, pristolnogo part, the natural structure of which is disturbed as a result of dynamic loads and erosion by the liquid during the drilling of the roof and the formation of the water intake funnel.

The aim of the invention is to increase the reliability of the roof fastening.

The goal is achieved by Tet-i that according to the method of construction of filterless wells / n. it includes drilling and casing of wells with ribbed surface and perforation in surfacings | -1st part, development in a sandy formation -.-: pier-, sinker funnel, art; -: partial partial collapse of sagging roof, pumping hardening material, drilling it after hardening and additional development of a water intake funnel, the roof collapse is carried out at a length of an interval of perforation equal to the height of the equilibrium roof, hardening material is pumped into the formed material. the space between the balance of equilibrium and the collapsed rock, e, the additional development in the inlet funnel is carried out after removal of the collapsed rock through the well) 1 (Inu; r; rn 15 height h (-s) - determined;

BA

ъ 1.7 m, h o, 28; at i 2 m, hz 0, In addition, the filling of sand 3 well;::; Inu increases the complexity of its construction.

The closest to iso-tremuke is the construction method;

wells, which include sinking and casing wells with ribbed surfaces and perforations in the subsurface section, development of an auxiliary crater sand bed, artificial partial collapse of a sagging roof, injection of a piercing material, hardening and additional development of a water intake hopper .I

-d angle at the base of the cavity

collapse, hail, P / Pi 1 o / f-l-- angles of natural slopes

respectively, but clayey rock and sand, hail; K, - -, coefficient ";: nt loosening of gly

i-ish breed

FIG. Figure 1 shows the water intake -: a wormhole with a collapsed rock -A cavity under the arch of the collapse; nb - a developed aodopri-iemma funnel under an artificially fixed roof, the construction of a filterless well is carried out as follows. After penetration and casing of the well by pipes 1 with a ribbed surface (not shown) and perforations 2 in the near-shoe part in the sandy formation 3, an air-hopper with a depth h with an angle of slope of the side walls is developed by air-lift. Then, an artificial partial collapse of the clay roof 5 s is carried out the formation under the arch 6 of the height hp of the cavity 7 of the collapse with an angle at the base of Sp. In order to break the roof in the pribashmak part of the column, an interval of length n is applied, for example, by pneumatic blasting through nepqtoration 2. Blown rock 8 occupies the tip of the middle part of the water intake funnel k in the form of a bilateral cone with a height equal to the depth of the funnel and the angle of natural slope the space between the vault 6 and 7 of equilibrium (the hoops, the cone of the collapsed rock 8 and the slopes of the water intake funnel 4, as well as into the space behind the casing (Fig. 2), is pumping the cement solution 9 After the solidification cement strut; ss are drilled and the collapsed rock 8 is removed through the well, then additional development of the water intake funnel 10 is carried out within the natural stability of the roof 5 .. -.,.. Example. To construct a non-filter well in the formation 3 medium nezernen Under the roof, represented by dense loams with a goat of a fortress of 0.7, the water-bearing horizon will be opened and the casing will be installed to the roof mark. Then, using an airlift in aquifer sand, a water intake funnel with a depth of hi (0.9 1 radius g, 0.3 / 0; ii-66 s 1.9 m and volume V -1.0;)) is developed; 1, g The power of the roof is determined; subject to collapse. For Zedann 1x conditions, the ratio hc / h, 1; 3 1 ,, 4 is used, from where for medium-sized sand h (Vh is K2 and hg 1, 1,, 9 1.1 fi. The breakdown interval is 4 equal to the perforation interval 1, 1 m. At this interval, the impact was carried out by pneumatic explosion from the bottom upwards from the shoe to the design mark, measured simultaneously in the water intake funnel, the height of the fracture rock number.The effect is stopped when the top of the cone of the collapsed rock of the column shoe is reached, at hh (,. ) SO, 7 this is equal to g h | -X 0.77 m and the volume J Uz uf h with z, OS,, 0.72 m. Volume about ear rock is equal to Vp V, K 0,, 15 0.0 21 To fill the free space of the mine working with cement solution, the last is pumped into the volume, practically, the volume of the water receiving funnel, since H V {, (Kg) 2.8 -0, 72 C1 ,) 2.7 m5. At the same time, the distribution of the cement slurry in the sections is as follows: at-g 1,1 1.1 m. At the casing pipe h 3 of the most loaded section, at gs 0.77 m Lz 0.77T 0.577 O. m (in reality HLL is greater than as in the case of a pneumatic explosion, the collapse of the roof ledge inevitably occurs). PRI Pf.- 0.9 m h g to 0, 577 0.52 m, with r i: | 1.9m h О, ТL-: i 1 -; m in the image, - from the point of view of strength; A reasonable distribution of the hardening aggregate in the thickness of the artificial roof is achieved. After hardening, the cement stone is drilled and the collapsed rock is removed through the resulting well, for example; overmoling with direct rinsing. Then, additionally, the water intake funnel is broken up, its depth is deduced, for example, for h T, 7 m. Radius up to rj 2.6 m. The method of construction of filterless wells compared to the known ones is characterized by controlled sagging of the sagging (the most weakened part of the roof, using collapsed cr. ov, aln technological purpose, creation of free space of mine workings of expedient configuration and formation of a stable and durable artificial arch, which increases the reliability of the construction of a well-free groundwater.

FIG.

3 10

FIG. 2

Claims (1)

METHOD FOR CONSTRUCTION OF FILTER-FREE WELLS, including sinking and casing of pipes with a ribbed surface and perforation in the near-shoulder part, development of an auxiliary funnel in the sand layer, artificial partial collapse of the sagging roof, injection of hardening material, drilling it after hardening and additional development of water and h a-, y, and y with the fact that, in order to increase the reliability of roof fastening, roof collapse is carried out along the length of the perforation interval equal to the height of the balance of equilibrium Then, the hardening material is pumped into the space between the balance of equilibrium and the collapsed rock, and the additional development of the water intake funnel is carried out after the collapsed rock is removed through the well. and the height h _{c of the} arch is determined by the formula ---------- g where is the depth of the intake funnel, m; - angle at the base of the caving cavity, deg; 00 _g and s / i - angles of natural slopes of clay rock and sand, hail; To G-coefficient of loosening. SU ... 1043294