|Publication number||US3112442 A|
|Publication date||Nov 26, 1963|
|Filing date||Feb 19, 1960|
|Priority date||Feb 19, 1960|
|Publication number||US 3112442 A, US 3112442A, US-A-3112442, US3112442 A, US3112442A|
|Inventors||Bennett John D|
|Original Assignee||Sun Oil Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (21), Classifications (10)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Nov. 26, 1963 J. 0. BE ETT 3,112,442
BORE LE LOGGING APPARATU AVING SEPARATE LANDING ME R MEANS TO POSIT A RECORDING INSTRUMENT CASING ABC RILL BIT Filed Feb 1960 mmvrox JOHN D. BENNETT ATTORNEYS United States Patent 3,112,442 BORE HOLE LOGGING APPARATUS HAVHNG SEPARATE LANDING MEMBER MEANS Ti) POSHTIUN A RECORDING INSTRUMENT CAS- ENG ABQVE A DRILL BET John 1). Bennett, Richardson, Tex, assignor to Sun Gil Company, Philadelphia, Pa, a corporation of New Jersey Filed Feb. 19, 196i), Ser. No. 9,867 6 Claims. (Cl. 3241) This invention relates to bore hole logging apparatus and particularly to apparatus involving the location of recording apparatus within a hole.
Conventional methods of well logging, whether of electrical or other types, involve the absence of the drill stem during the logging operation. This has two serious drawbacks in that not only must special time be consumed in running the well log, during which time the drill stem must be out of the hole, but after a period of drilling, due to the fact that the drill stem must be removed, there is inevitably a delay before the new part of the hole may be logged, during which delay there occurs invasion of the formation by the drilling liquid. Since the drilling liquid has physical properties of its own, it may, by penetration of porous layers, greatly change their properties so as to interfere with their detection. For example, in the case of electrical logging, the conductivity of the liquid will effect changes in the apparent conductivity of the formations; and in the case of acoustic logging the absorption and velocity of sound will be changed, etc.
Improved logging methods and apparatus are disclosed in the application of Fred M. Mayes and Jack Weir Jones, Serial No. 683,027, filed September 10, 1957, now Patent No. 3,065,404, issued November 20, 1962, and the application of John Bennett, Preston E. Chaney, Jack Weir Jones and Fred M. Mayes, Serial No. 685,717, filed September 23, 1957. The logging methods and apparatus so disclosed may be used when a drill string is in a bore hole and may be used at any time with a minimum of interruption in drilling. Not only may the logging be accomplished just prior to removal of the drill string for the purpose of changing a bit, but the logging may be carried out to be promptly followed by a continuation of drilling. In brief, a self-contained energizing and recording apparatus may be dropped into a drill string in godevil fashion or may be pumped down therethrough when the drill string has been lifted to only a limited extent from the bottom of the hole to provide a region for the reception of an electrode or other logging assembly. The apparatus is of a type suitable to pass through the mud flow opening of a jet bit which may be of any of the conventional popular types. Such bits are presently widely used since they effect the carrying away of cuttings and avoid their reworking by the drill. These jet openings are generally at relatively small angles with respect to the drill stem axis and a flexible electrode assembly may, accordingly, be projected therethrough to extend beneath the bit. For electrical logging the assembly is an electrode assembly; for acoustic or other logging it may be of suitable type for exposure to the walls of a hole.
The self-contained assembly which is lowered to the vicinity of the bit contains, for electrical logging not only means for supplying current to the earth, but also means for recording various potentials at the electrodes of the assembly. The recording, as disclosed in said applications, may be effected magnetically.
The present invention is directed to apparatus for per mitting the taking of a log at any time during a drilling operation without removing the drill stem from the bore hole even though no landing member or similar apparatus has been placed in the drill string. The purpose of a landing member is to support and position the self- "ice contained energizing and recording apparatus in the logging position within the drill pipe. In accordance with the invention a landing member is lowered into the drill pipe before the energizing and recording apparatus. The land ing member is adapted to rest on the drill bit at the bottom of the drill pipe and provides a landing shoulder at its upper end. As the logging apparatus is subsequently lowered into the drill pipe, the casing containing the recording apparatus engages the landing shoulder whereby the landing member restricts further descent of the logging apparatus. At this point the logging apparatus will be in the proper logging position.
The object of the invention relates to the attaining of the foregoing results and will become more apparent from the following description read in conjunction with the accompanying drawing, in which:
FIGURE 1 is an axial sectional view showing, in particular, the approach of the logging apparatus to the lower end of the drill stern comprising a landing member in accordance with the present invention; and
FTGURE 2 is a section taken on line 22 of FIG- URE 1 shown in an enlarged size.
Details of the apparatus are not shown herein since the recording elements and the general electrode construction are shown in detail in the applications referred to above to which reference may be made. Reference may also be had to the application of John D. Bennett, Preston E. Chaney, Jack Weir Jones, and Fred M. Mayes, Serial No. 813,162, filed June 4, 1959, for a further description of the electrode and recording casing construction. The present invention is concerned primarily with the external aspects of the apparatus and their relationships to each other. It will, therefore, be understood that the logging apparatus may comprise any suitable recording apparatus for electrical or other logging and that the electrode assembly may be of any suitable type for the type of logging which is being carried out. The electrode assembly may carry electrodes if electrical logging is being performed, or it may contain acoustic, radioactive, high frequency, or other elements in the cases of other types of logging. For simplicity of description, however, the apparatus will be described as it would be for electrical logging, being of a construction corresponding to that of said prior applications.
A conventional hollow drill stem is indicated at 2. This drill stem comprises at its lower end the usual drill collar 4 carrying the bit 5 provided with mud flow openings 6 desirably lined, as usual, with erosion-resisting liners 8.
A casing 10* contains a recording apparatus 11 which is preferably of the type disclosed in said application Serial No. 818,162. The upper end of casing 10 is con nected to apparatus, such as that disclosed in said lastmentioned application, for restraining the rate of descent of the casing it? through the drill collar 4-. Extending from the lower end of casing it! is a flexible electrode assembly 12.
The electrode assembly 12, which is preferably of the type more fully disclosed in said application Serial No. 818,162, is fundamentally a multiconductor insulated electrical cable on which electrodes are provided. Any number of electrodes may be provided as indicated at 13 and 14- each being connected to an individual conductor of the cable. At the lower end of the electrode assembly 12 there is a Weighting arrangement 15 having a sufiicient number of Weights to insure that, during lowering, the flexible electrode assembly 12 will remain under tension. The arrangement just described provides the necessary flexibility to enable the entire assembly to pass through a jet opening. A flexible strip 16 of leather or plastic extends from the weighting arrangement 15 and facilitates, by its entrainment in the drilling mud flow,
the guidance of the electrode assembly into a jet opening. The arrangement is such that ultimately the electrode assembly 12 is projected through the drill bit so that the electrodes exposed to the walls of the hole below the bit with adequate spacing from the bit so as to provide the desired electrical configuration.
Casing is provided with a landing ring 18 at the lower end thereof. Ring has a conical seating surface 2% forming the lowermost end of easing Ill). Within the ring 13 there are mounted pins 2 1 projecting slightly beyond the conical surface Ztl of the ring 18. These pins are electrically connected to each other and to the recording apparatus for grounding the latter as will hereinafter be described.
Means are provided for positioning the recording apparatus at the end of its descent into the drill collar Such means comprises a landing member 22 including a hollow cylindrical portion 24 having outer wall 2-6 substantially concentric with the internal wall of the drill collar 4 but having a slightly smaller diameter whereby the landing member 22 is centrally positioned. While there should be a sung fit between portion 24 and the internal wall of the drill collar 4, there must be sufficient freedom to permit entrance of the landing member 22.
The lower end of the cylindrical portion 24 is joined with three rods 23 ci cumferentially spaced at their upper ends about cylindrical portion 24 and joined at their lower ends to form a spider arrangement. Another rod is joined to the lower ends of rods 23 and extends downwardly therefrom. Rod 30 has an enlarged head 32 at the lower end thereof adapted to engage the usual interior shoulder 34- of drill bit 5 whereby the landing member 22 is adapted to rest on the drill bit 5 in a definite vertical relationship thereto. The upper end of cylindrical portion is provided with a conical shoulder 3t: adapted to be engaged by the conical surface 28 of casing 19. When casing 10 is seated on the conical shoulder 36, pointed ends of pins 21 are forced into the seat 36 to provide the necessary electrical contact, penetrating scale or other resistant material which mav accumulate on the seat 36. The bottom of the head 32 of landing member 22 may also be provided with sharp projections for insuring good electrical contact with the shoulder 24 of the drill bit 5. Hence, there is an effective grounding of the recording apparatus through the landing member 22.
A ring 38 of suitable sealing material, such as neoprcne, is contained within an annular recess 40 at the outer diameter of the upper end of cylindrical portion 24 to provide a protective seal with the internal wall of the drill collar 4. This seal restricts the flow of drilling mud between the wall 26 and the internal wall of the drill collar 4- to thereby prevent abrasion of such walls by the drilling mud. Spaced rods 28 define a plurality of openings 42 to permit the passage of electrode assembly 12 through the landing member 22 and are rounded to guide or cam a descending electrode assembly 12 through the opening 42.
In operation, if it is desired to log a hole and no landing member has been placed in the drill stem before the drill pipe was run into the hole, the drill stem is raised from the bottom of the hole to provide a space for the extension of the electrode assembly 12 below the bit 5. If the exact size of the inner diameter of the drill collar 4 is not known, this dimension may be measured by a calipering device of a well-known type which may be lowered into the drill bore on a line and retrieved. A landing member 22 of a diameter slightly less than the diameter of the drill collar bore is then dropped into or pumped down from the top and comes to rest in the position shown in FIGURE 1 upon engagement of rod 30 with bit 5. Next the recording assembly is dropped in go-devil fashion, lowered on a Wire line or pumped down through the drill stem. Reference is made to said 4 application, Serial No. 818,162 for the details of the lowering of the recording assembly.
As the recording assembly moves downwardly, the electrode assembly 12 passes through the hollow cyclindrical portion 24 and one of the openings 42 of landing member 22 and then enters and feeds through a jet Opening in the bit. The extension rod 3% serves to space the body of the landing member 22 from shoulder 34 to insure that the jet openings 6 will not be covered and to give the flexible electrode assembly 12 freedom of movement after it passes the arms 28 to adjust itself for entrance into a jet opening. The recording assembly comes to rest upon engagement by the conical surface 20 of casing 10 with shoulder 26 of landing member 22 and with the electrode assembly 12 fully extended. The logging op- -ration may then be carried out with the apparatus seated on the landing member 22. Since the position of the drill bit 5 is known and the landing member 22 positions the recording apparatus in a known vertical position relative to the drill bit, the position of the electrodes may be readily determined.
The actual logging operation after the assembly is located at the bottom of the drill stem is carried out in the fashion described in said prior applications, provisions being made to start the recording and energizing apparatus, the drill stem being lifted for logging purposes to the desired extent. Finally the logging apparatus may be removed by an overshot lowered on a wire line or may be recovered when the drill bit is brought to the surface.
It will be evident that the features of the invention may be carried out by other apparatus, and it is therefore to be understood that the invention is not limited except as required by the following claims.
What is claimed is:
1. Bore hole logging apparatus for use in a drill stem having an axial bore therethrough comprising a casing containing recording apparatus, said casing having a construction and shape such that it fits within the axial bore of the drill stem for lowering of said casing therethrough, a drill bit carried by the drill stem, and means separate from said casing and drill stem arranged to be lowered through the drill stem independently of said casing to rest on said drill bit and providing a landing shoulder spaced above said drill bit for positioning said casing for the logging operation.
2. Bore hole logging appaartus for use in a drill stem having an axial bore therethrough comprising a casing containing recording apparatus, said casing having a construction and shape such that it fits within the axial bore of the drill stern for lowering of said casing therethrough, a flexible member extending from the bottom of said casing, a drill bit carried by the drill stern and having an opening through which said flexible member may project to extend below said bit when said casing is in the position for logging, and means arranged to be lowered through the drill stem to rest on said bit and providing a landing shoulder for positioning said casing for the logging operation and an opening through which said flexible member projects when said casing rests on said shoulder.
3. Apparatus as claimed in claim 2 wherein said positioning means comprises a wall portion substantially concentric with the walls of the drill stem bore for centrally disposing said positioning means therein and a member joined with said wall portion extending downwardly therefrom for contact with said bit.
4. Apparatus as claimed in claim 3 wherein said wall portion defines said landing shoulder at the upper end thereof and said means joining said last named member to said wall port-ion comprises a plurality of spaced arms positioning said last named member centrally of said wall member.
5. A landing member for positioning bore hole logging apparatus at the lower end of a drill stem having an axial bore therethrough and a drill bit at the lower end thereof,
said landing member being a separate structure unconnected to said logging apparatus or said drill stem and comprising a wall portion substantially concentric with the wall of the drill stem bore to centrally position the landing member within the bore, said wall portion having a landing shoulder at the upper end thereof for contacting bore hole logging apparatus descending through said drill stem to arrest the same upon contact with said shoulder, said wall portion having a smaller configuration than the drill stem bore for lowering thereof through the drill stem, a member extending downwardly from and joined to said wall portion, said member being arranged to contact at the lower end thereof a drill bit carried by the drill stem to space said 'wall portion from the drill bit, and means defining a passageway through said Wall portion and said member.
6. A landing member for positioning bore hole logging apparatus at the lower end of a drill stem having an axial bore therethrough and a drill bit at the lower end thereof, said landing member being a separate structure in itself and comprising a tubular wall portion substantially concentric with the wall of the drill stem bore to centrally position the landing member within the bore, said wall portion having a landing shoulder at the upper end thereof for contact by bore hole logging apparatus, said wall portion having a smaller configuration than the drill stem bore for lowering thereof through the drill stem, a member extending downwardly from and joined to said wall portion, said member including a rod and spider means joining said rod and said wall portion, said rod being contactable at the lower end thereof with a drill bit carried by the drill stem to space said wall portion from the drill bit, and means defining a passageway through said wall portion and said member, said passageway being defined by the interior of said wall portion and by said spider means.
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|U.S. Classification||324/347, 324/323, 175/50|
|International Classification||E21B47/12, E21B47/01, E21B47/00|
|Cooperative Classification||E21B47/011, E21B47/124|
|European Classification||E21B47/12S, E21B47/01P|