CN1011992B

CN1011992B - Radiation well series-bead cave well method

Info

Publication number: CN1011992B
Application number: CN 88104486
Authority: CN
Inventors: 宁远明
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology; Hefei Polytechnic University
Priority date: 1988-07-26
Filing date: 1988-07-26
Publication date: 1991-03-13
Also published as: CN1039865A

Abstract

The present invention relates to a series-bead cave well drilling technology which is adopted for constructing radial wells in strata of inhomogeneous sand layers. The technology makes use of the characteristic that the sand layers are easy to collapse, and radial pores form a series-bead cave by high pressure, large water quantity, timing, section punching and sand removal in the radial pores of the radial wells. The series-bead cave well drilling technology expands seepage cross sections, increases water output, optimizes water quality, avoids the defects that water-bearing layers are extruded in a push pipe type well drilling technology and water quantity gradually weakens, prolongs the service life of the wells, saves a large number of pipe materials and also solves the problem that the wells are not easy to form in sand strata by general well construction devices.

Description

Radiation well series-bead cave well method

The well completion method of flat radial the present invention relates to fetch water in the stratum of heterogeneity layer of sand.

Have now on the stratum of heterogeneity layer of sand and beat in the well completion method of radial, the way that the general steel filter pipe that adopts forcing press will have the carbide alloy tip heads into layer of sand forms the horizontal radiation hole, cave in, gush the problem that sand is more than, be difficult for pore-forming easily though solved the layer of sand that conventional method ran into like this, but destroyed the natural structure of layer of sand, cause layer of sand to be extruded closely, and the space between sand grains reduces, thereby influence the water yield of well, the use of simultaneously a large amount of steel filter pipes also greatly improves the cost of well.

The purpose of this invention is to provide a kind of usefulness equipment of generally digging a well is beaten radial in the stratum of heterogeneity layer of sand catenulate hole radiating aperture new method.It can enlarge the seepage flow section of radiating aperture in the radial, increases water yield, can save the drainage steel pipe in a large number again, reduces the cost of well-digging.

Method of the present invention may further comprise the steps: 1, creep in sleeve pipe with the rig drill bit and play radiating aperture, the steel sleeve pipe follows drill bit constantly to advance layer of sand simultaneously, arrive the expectation degree of depth up to drill bit, following into can be drilling rod of steel pipe plays the positioning and directing effect and prevents caving in of radiating aperture layer of sand.2, from radiating aperture, withdraw from drill bit, and puncher is put into the expectation degree of depth.3, sleeve pipe timing, fixed section are withdrawed from radiating aperture, sleeve pipe whenever withdraws from one section, puncher is just used centrifugal pump, slush pump sediment outflow simultaneously, is made one in arch cave with high pressure, big yield punching, through so repeatedly regularly, fixed section making the cave, retreat to till the short segment distance in radiation aperture up to sleeve pipe.4, from radiating aperture, withdraw from puncher.5, push the well filter pipe littler than steel sleeve diameter, then the final stage steel sleeve is all withdrawed from, so far, a catenulate hole radiating aperture is just accused and is finished.6, some radiating apertures to radial repeat said method, just can finish a radial that has the radiating aperture of some beading cavitation.

The present invention is to be up to general well-digging equipment and with drill bit because of radiating aperture, and it will lack the more existing extrusion method of the extruding of layer of sand, and cost is low.And in the cavitation method, the present invention has adopted high pressure again, the punching of big yield, and sediment outflow, will wash away by the part fine sand, and that part of fine sand that stays, again with the big coarse sand of the particle cave that under high pressure overarches, so not only, the cave makes stress equalization because of being arch, cave itself is difficult for caving in, and no longer needs to come retaining wall with filter pipe, and this beading cave also helps the afflux of water, and punching, sediment outflow technology makes the collocation of sand grains thickness, reconfigure, formed a good loaded filter, made water quality optimizing, and permeability is also than former being greatly improved, beading arch cave, big because of its cutout cross section, removed the resistance of filter pipe again, the comparable general push pipe formula extruding radiating aperture well completion method of the water yield of the good again therefore well of permeability wants big 4-8 doubly, the life-span of well is also long, therefore has very big economic worth.

Fig. 1 is the floor map of catenulate hole radiation cellular type radial

Fig. 2 is the generalized section of Fig. 1

1 is the radiation well bore among the figure, and 2 are radiating aperture, and 3 is catenulate hole, and 4 is the heterogeneity layer of sand.

Beat radial in the heterogeneity layer of sand, first well-digging body 1 is played catenulate hole radiating aperture in the different azimuth of the layer of sand of differing heights then, only represents to play 6 catenulate hole radiating apertures in 6 orientation in a certain height layer of sand 4 in Fig. 1.Its procedure is:

(1) earlier a kind of head end is had that drill bit, tail end have connecting thread, diameter advances layer of sand than the steel sleeve of the big 1-2 level of drill bit, drill bit links to each other with rig by drilling rod, start rig, drill bit creeps into to layer of sand, when drill bit advances the 300-400 millimeter, sleeve pipe follows up thereupon, and it is with the lengthening of radiating aperture 2, link to each other with screw thread with the sleeve pipe of front with subsequent casings is sectional, progressively follow into arriving and estimate the degree of depth until drill bit.

(2) from radiating aperture 2, withdraw from drill bit, and puncher is put into the expectation degree of depth.

(3) with sleeve pipe every 2-3 hour, withdraw from one section in radiating aperture 5-8 rice, whenever withdraw from one section, puncher is just used 6Kg/cm in this 5-8 rice ²The big a small amount of punching of pressure is put sand with centrifugal pump, slush pump, makes a cave 3, so repeatedly regularly, a fixed section punching out cave, and till steel sleeve is during from 10 meters left and right sides, radiation aperture.

(4) from radiating aperture 2, withdraw from puncher.

(5) in steel sleeve, push than this and manage little 1-2 level well filter pipe, then steel sleeve is all withdrawed from.

So far the radiating aperture of a catenulate hole has just been finished, and makes a call to six equally with this, and the radial with catenulate hole radiating aperture has just been finished.

New like this radial well completion method, the water yield of the well that comparable general well completion method is got increase more than 4 times, the efficient height, and water quality optimizing, the life-span of well is long, and can save filter pipe in a large number, and cost is low.

Claims

1, the fetch water well completion method of flat radial of a kind of differing heights different azimuth of the well bore of in the stratum of heterogeneity layer of sand, formerly beating, it is characterized in that this method comprises the following steps: that (1) steel sleeve that drill bit is outer with being enclosed within drill bit advances layer of sand, with rig the drill bit that is enclosed within on the drilling rod is crept in sleeve pipe and beat width of cloth perforation, steel sleeve is continuous propelling layer of sand along with drill bit creeps into, up to reaching the expectation degree of depth, (2) withdraw from drill bit, and puncher is put into estimates degree of depth place, (3) withdrawing from regularly fixed section of sleeve pipe, whenever withdraw from one section, puncher is just at this section high pressure, the water punching of big yield, use centrifugal pump, slush pump is discharged silt particle from the hole, makes a cave, so regularly, fixed section withdraws from, the punching out cave, till about about the 10 meters distance in radiation aperture, (4) withdraw from puncher from radiator up to steel bushing, (5) in steel sleeve, push than this and manage little 1-2 level well filter pipe, withdraw from the steel sleeve of back segment then.

2, by the described well completion method of claim 1, it is characterized in that sleeve pipe timing, fixed section withdraw from and puncher is regularly decided section punching, sediment outflow, this regularly was generally 2-3 hour, and this decides section and is generally 5-8 rice.