SU1301965A1 - Method of taking rock samples from coreless drilled wells - Google Patents

Abstract

This invention relates to the field of hydrogeology and engineering geology. The purpose of the invention is to increase the reliability of geological results for a large number of exploration and exploration wells of a coreless rotary drilling rig, evenly located throughout the study area and using correlative communication associated with the data of single wells of mechanical and core drilling, as well as experienced bushes. In order to determine the material composition and filtration properties of essentially sandy aquifers, rock samples are taken by visual and laboratory methods from sandy material brought to the surface with water from a filter when testing and operating water wells. Equipped with a filter column and exploratory, or production wells designed for various purposes in the first period of the usual technological regime of deglinization, pumping, pumping out or operation due to a sudden change in reservoir pressure is usually sanding, i.e. A considerable amount of sandy material is carried away from the aquifer with water to the surface. Selection of The samples are produced at the wellhead using the simplest settling tank in the form of any "vessel." 4 tab. with S (L with O5 Sl

Description

The invention relates to hydrogeology and engineering geology. Namely, methods for studying the material composition and filtration properties of an aquifer, and can be used to study substantially sandy aquifers or water-filled loose debris with sandy aggregate.

The purpose of the invention is to increase the reliability of geological results for a large number of exploratory: and non-core rotary drilling exploration wells, evenly distributed over the entire study area and using correlative communication of shock-mechanical, core drilling as well as experimental bushes.

This goal is achieved in order to determine the material composition and filtration properties of essentially sandy aquifers from rock samples using sandy materials that are brought to the surface with water from the filter by testing and operating wells with traditional methods for studying samples of the damaged structure using visual and laboratory methods.

The use of the proposed method is ensured by the presence of a side effect of sanding known in the practice of well construction. Equipped with a filter column and intended for various purposes prospecting, exploration or production wells in the first period of conventional

on the technological mode of experiments on

deglinization, pumping, pumping out or operation, regardless of the type of filter working part, and especially with filters from perforated pipes that are most often used in rock-trench sediments, due to a sharp change in reservoir pressure, sand is usually sandy, i.e. A significant amount of sandy material is carried to the surface from the aquifer with water.

Sampling for various types of studies is carried out at the wellhead using a simple sump in the form of any vessel, similar to sampling river sand in a volume sufficient for carrying out the necessary

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a complex of laboratory studies.

The proposed method was tested in pilot order when prospecting certain groundwater deposits. Petrographic description, determination of the granulometric composition of water-bearing rocks, their filtration and water return coefficients, made on rock samples, carried with a large amount of water from self-flowing wells with the usual test mode, gave results similar to those obtained from core wells (Table 1). and 2).

During the exploration of groundwater deposits in boulder-pebbles with sandy aggregate characterized by a heterogeneous lithological structure, almost identical results of laboratory studies of samples taken from the same cut intervals in several

wells of shock-mechanical drilling in the process of drilling and pumping with the removal of sand from the filter (Table 3).

A series of comparative analyzes of samples from alluvial sand, taken from the wells of impact-mechanical drilling during penetration and pumping, also affects the reliability of the results of the studies (Table 4).

The proposed method can be implemented in practice with minimal additional costs and give a certain positive effect in the study of significant areas of groundwater deposits, hydrogeological and engineering and geological mapping of sedimentary complexes.

Claims (1)

Invention Formula The method of sampling rock from wells without core drilling to study the filtration properties and material composition of a substantially sandy aquifer by visual and laboratory methods, characterized in that, in order to increase the reliability of geological results, samples are taken from the sandy material carried to the surface with water from the filter when testing and operating wells on water. m r lO ON ON CM .-. m CM m m "Pt CM t d - O 0 - m 00 CM CM N in LO LO O n CM st CM r CM CTi rt CM cho ff4 N r n about CO CM (r- " CM CM GO00 1LrOO - denro en vO ON CM 1 cy. r vdCM CM r- 00 en cho t f vO oo about CM CM CM CM in vD rk to 1043 From core 047 324 C. Sand removal from under the shoe both. pipes Removal of the sand 573-587 ka from the filter on the spout 455-587 327 620-680 0.2 0.3 0.3 0.4 2.0 0.8 0.9 2.2 From cuttings at 775 drilling 785 0.4 1061 Removal of the dog -240-253 1.0 ka from the filter 0.7 1.1 0.7 1.4 1.9 2.1 2.2 4.0 0.2 - 0.1 0.5 37,716,710,65,56,7 22,042,720,73,53,7 41,722,16,51,91,5 23,733,713,37,16,2 26,924,617,710,78,6 43,239,611,02,31,2 33,642,613,03,71,5 32.043,712,82,72,2 26.154,610,12,32,3 34,113,67,38,015,6 48.017,09,76,26,9 22.144,413,25,75,6 39,429,317,82,22,8 0.5 8.7 46 10.89.5 1.0 3.0 9.1 31.448.3. 22.0 12.7 15.1 13.714.7 Table 2 3.43,4- 17,4 1.52,23.5 3.7 5.4 12.7 4f a a s P o a