RU2160821C2 - Procedure of winning of oriented core in process of drilling - Google Patents

Abstract

FIELD: geological prospecting of vertical and controlled directional holes including those with complex rock conditions. SUBSTANCE: core tool based on quantity- produced KD 11-190/80 is sunk to face. drill pipes, core taking pipe included are washed through. Electronic measurement inclinometer is dropped and fixed in non- rotatory core taking pipe. Ball valve shuts off core taking pipe and core is drilled. Orientation marks are continuously applied with the use of cutters-markers. Multiple measurements of azimuthal and zenith angles are taken simultaneously with the aid of inclinometer. Measurement results are recorded in storage unit of inclinometer. Data from storage unit are printed on computer after rise of core tool to surface. Core is oriented in accordance with printouts and marks. New azimuthal position of cutting tools and corresponding marks produced on core are recorded in case of turn of core taking pipe. EFFECT: reduced drilling time and cost of operation thanks to decreased number of sinking-lifting operations, expanded operational capabilities, enhanced authenticity and objectivity of information. 1 cl, 2 dwg

Description

 The invention relates to the drilling of mainly exploratory vertical and directional wells, including in monolithic and fractured formations.

 A known method of producing oriented core, implemented by the device according to AS N 1384718 (E 21 B 25/16, 03/14/86). This method is as follows. A device containing an inclinometric sensor located in a housing with flow channels, a retention mechanism with a drive, and a marking mechanism made in the form of a hydraulic nozzle are lowered into the well, the end surface of the core is prepared using a milling cutter, and washing is started. In this case, the inclinometric sensor is uncaged and occupies a position corresponding to the apsidal plane of the well. At the same time, a mark is applied to the core surface using a hydraulic monitor nozzle. Turn off the flushing, using an arresting mechanism, fix the inclinometric sensor and extract the core from the well. Comparing the readings of the inclinometric sensor and the position of the mark, the core can be oriented without additional geophysical work.

 Known adopted as a prototype method for producing oriented core, implemented by core set according to a. with. N 1,498,905 (E 21 V 25/16, 10/13/82). This method is as follows. A core set, which is a double core projectile with an internal core receiver pipe, which contains a float-type inclinometric recorder, a piston-driven locking mechanism and a marking mechanism in the form of marker cutters strictly oriented relative to the inclinometer recorder body, are lowered into the well and drilled. After the completion of drilling, the drilled core is fixed in the core-receiving pipe, orienting marks are applied with cutter markers and the position of the inclinometer recorder is fixed relative to the magnetic meridian, vertical and the drilled core. When lifting a core set, a direct core break from the bottom is performed, after which the set is disassembled, the readings of the inclinometer are read, and the core is oriented according to the mark applied by the cutter markers.

 The principle of a double core projectile with a non-rotating core receiving pipe provides for preventing the rotation of the inner pipe due to the friction of the core on the inner surface of the core receiving pipe.

 The disadvantage of the above methods is the limited operational capabilities, because they allow you to obtain data on the position and composition of the core in only one "point". This gives objective information only if the core is obtained monolithic to the entire depth of the groove. However, during drilling of weakly cemented, highly permeable, or fractured rocks, especially in inclined areas, periodic core fracture is possible, which leads to rotation of the core receiving pipe along with the outer casing, as a result of which different pieces of core will be differently oriented during one drilling.

 The problem to which the invention is directed, is the expansion of operational capabilities.

 The technical result from the use of the invention is to obtain complete and objective information about the orientation of the core in the process of one hollowing. The specified technical result is achieved due to the fact that in the method of producing oriented core, including core drilling, measuring and recording azimuthal and zenith angles using an inclinometric recorder and simultaneously marking the core using cutter markers, measuring, recording angles and applying marks are performed repeatedly in the process of one drilling.

 As an inclinometer, an electronic measuring inclinometer with a memory unit is used.

 In FIG. 1 and 2 are presented in section of a device that implements the inventive method, the upper and lower parts, respectively.

 The device comprises a housing 1 with sub 2 and 3 for connection with drill pipes and a drill head, a non-rotating core receiving pipe 4, on the lower end of which a core assembly 5 and a sleeve 6 with three pick markers are fixed, an articulated-bearing assembly 7, through which the core receiving pipe 4 by means of a screw 8 and a nut 9 with a stopper 10 connected to the housing 1, the inclinometric recorder 11, which is installed and fixed in the seat of the core-receiving pipe 4 in a strictly defined position when dumping it into the well. A ball valve seat 12 is mounted in the pivot-bearing assembly and holes 13 are made for bypassing the flushing fluid. One of the cutter markers is the reference one and is located at certain angles from each of the side cutters, the position of the cutters being strictly oriented relative to the inclinometer, and the positions of the recorder and the supporting cutter are marked on the outer surface of the core receiving pipe. To eliminate the deviation, device parts located near the inclinometer recorder are made of non-magnetic materials. The device itself is based on the commercially available core projectile KD 11-190 / 80 "Nedra". As an inclinometer, an electronic measuring inclinometer, for example [3], with memory blocks is used.

 The inventive method is as follows. The collected core projectile (without inclinometer) is lowered to the face and the flushing fluid is supplied, which passes through the core receiver pipe 4, cleaning it of slag that has fallen during the descent. After flushing into the drill pipes, the inclinometer logger 11 is reset, which is installed and fixed in the seat of the core receiver 4. Then the ball is inserted, which is installed in the valve seat 12, cutting off the interior of the core receiver 4 to prevent core erosion, and the drilling fluid passes through the holes 13 of the pivot-bearing assembly 7 in the annular space between the core receiving pipe 4 and the housing 1. When drilling as core enters the core receiving pipe 4 with cutters The sleeves 6 continuously apply marks to the core. At the same time, according to the instructions of the microprocessor of the inclinometric recorder 11, intervals of 20 to 40 s are used to interrogate the sensors of the zenith and azimuth angles and the received information is recorded in the memory unit of the inclinometer.

 In the case of rotation of the core-receiving pipe for any reason, the inclinometric recorder records the change in the readings of the sensors, and with subsequent stabilization of the position of the core-receiving pipe, it registers a new azimuth of the position of the reference tool and, accordingly, marks received on the core.

 After lifting the core projectile to the surface, the inclinometric recorder is removed, data from the memory unit is entered into a ground computer and printed, the core is removed from the core receiver pipe and oriented according to the record and marks. Thus, the proposed method allows to obtain oriented core continuously during the drilling process, which significantly reduces the time and cost of work mainly due to the reduction in the number of tripping operations, and also provides more complete and reliable information characterizing the formation in which the core is selected.

Claims (2)

 1. A method of obtaining oriented core during drilling, including core drilling, measuring and recording azimuth and zenith angles using an inclinometer installed in a non-rotating core receiving pipe, and simultaneously marking the core using cutter markers, characterized in that marking with the help of cutter markers is carried out continuously as the core enters the core collection pipe, and azimuthal and zenith angles are measured and recorded gokratno during a single drilling, while in the case of rotating the core tube register new azimuth position incisors-timers and accordingly labels produced on a core.  2. The method according to claim 1, characterized in that as an inclinometric recorder use an electronic measuring inclinometer with a memory unit.

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