US1857405A

US1857405A - Deep well fluid-motor pump

Info

Publication number: US1857405A
Application number: US123860A
Authority: US
Inventors: Bernard H Scott; Samuel E Ross
Original assignee: SCOTT ROSS AND Co
Current assignee: SCOTT ROSS AND Co; SCOTT-ROSS AND Co
Priority date: 1926-07-21
Filing date: 1926-07-21
Publication date: 1932-05-10
Anticipated expiration: 1949-05-10

Description

y 1932 B. H. SCOTT ET AL 57,405

DEEP WELL FLUID MOTOR PUMP Filed July 21. 1926 6 Sheets-Sheet 1 PM l0 go 559N420 /7f 5c 0777,

I 5 5A M054 E. 505$, 59 I (44 13 6 85 May 10, 1932.

B. H. SCOTT ET AL DEEP WELL'FLUID MOTOR PUMP Filed July 21,1926

"E A A N A a I I I I 1 I I 1 I I a 6 Sheets-Sheet 2 Ff c 22.

s in ay 19325 B. H. SCOTT ET AL 1,857,405

DEEP WELL FLUID MOTOR PUMP Filed July 1926 6 Sheets-Sheet 3' y 1932- B. H. SCOTT ET AL ,857,405

DEEP WELL FLUID MOTOR PUMP F l y 21. 1926 6 Sheets-Sheet 4 71:19:11

' f 2% g g 3, 7 v 306 May- 10, 1932. B. H. 'ISCOTT ET-AL- DEEP WELL FLUID MOTORPUMP I Filed Jui 21, 1926 5 7 //AW //g J v N 5 5 Mm Z M 5 duced fluid-motor deep well pumps is that it;

Patented May 10, 1932 I UNITED STATES.

PATENT OFFICE BERNARD H. SCOTT, OF GLENDALE, AND SAMUEL E ROSS, OF LONG BEACH, CALIFORNIA,

ASSIGNORS TO SCOTT-ROSS AND COMPANY, OF LOS ANGELES, CALIFORNIA, A COR- PORATION OF DELAWARE DEEP WELL FLUID-MOTOR PUMP Application filed July 21,

thousand feet in de th and different types of pumps have been evised for pumping the oil from these'deep wells.

A common type of pump equipment ,consists of a reciprocatingpump which is placed .near the lower end of the well, the barrel thereof being secured to the lower end of a pump tubing which extends upward to the surface of the ground The plunger of the pump is connected to the lower end of a string of sucker rods which extends to a point above the surface of the ground and is connectedto a walking beam, by means of which it and the plunger are reciprocated. This type of pump is not entirely satisfactory, being ineflicient in operation and subject to frequent breakdowns which mean a loss of time and production. A great deal of this trouble results from breakage or uncoupling of the string of sucker rods.

Fluid-motor deep well pumps also have been produced. The fluid-motor deep well pump has a. fluid-motor operatively asso-.

ciated with a pump and disposed at the lower end of a string of pump tubing in the bottom of a deep well. A small pipe disposed within this pump tubing conveys clean oil under high pressure down'from the surface of the ground to the fluid-motor-which is motivated thereby to operate the pump which pumps well oil from the bottom of the well upward through the pump tubing.

One of the main faults of previously prois necessary to provide longitudinal eccentric ducts of great length in the bodyof.

1926. Serial N0. 123,880.

drical chamber in the lower end of a string of pump tubing that space is provided in this chamber wherein tubing may be disposed to form all necessary eccentric longitudinal fluid passageways for the operation of the fluid-motor pump.

Another difliculty with previous fluid-motor deep well pumps is in the complete structural separation of the motor and the pump,

the pump plunger being moved by the motor piston through a piston rod; thus the effective pressure surface on one end of the piston is smaller during one stroke than during the opposite stroke. Therefore, when the diameter of the pump is made smaller than that of the motor cylinder in order to increase the unit area pressure applied to the pumped fluid by a given unit area pressure in the operating fluid, a different increase is effected fora stroke in one direction than the other direction.

It is therefore another object of our invention to provide a fluid-motor deep well pump in which the ratio of operating fluid pressure so pumped'fluid pressure will be the same for strokes of the pump in opposite directions.

Itis a further object of our invention to provide a fluid-motor deep well pump having a piston working in a barrel and being operated, by clean oil or an other suitable operating fluid introduced into one end of the barrel, to move against well oil in the opposite end of this barrel, so that the clean oil, being at a higher pressure than the well oil, will tend to leak around the piston and wash any sand particles from between the bearing surfaces of the barrel and the piston. After once commencing the operation of the fluid-motor deep well pump, as briefly described above, the pump, tubing and the small operating oil pipe thereof are filled with oil. In case it is 'desired to remove invention to provide a fluid-motor deep well It is very desirable in operating a fluidmotor pump that the flow of operating fluid to said pump and the flow of exhaust oil from said pump bekept as continuous as possible for the purpose of reducing the loss of energy occasioned by overcoming the inertia of the columns of operating fluid and exhau when the speeds of their flow fluctuate.

Still another object of our invention is to provide a fluid-motor deep well pump havlng a gas cushion element disposed in the operating fluid pipe line which tends to absorb any tendency toward pulsation in the columns of operating fluid and exhaust fluid flowing to and from the pump.

Other objects and advantages will be made manifest in the following description and in i the accompanying drawings in which:

Fig. 1 is a diagrammatic view illustratinga deep well in which a preferred embodiment.- v of our pump is shown installed in a well with the necessary auxiliary equipment for operating the same. 7

Figs. 2 to 9; inclusive, are vertical sectional views of portions of the fluid-motor pump of our invention which are taken upon the same plane and which may be'joined together in consecutive order to form a complete sectional view of our pump.

Fig. 10 is a vertical sectional view taken on the line 1010 of Fig. 6.

Fig. 11 is a vertical sectional view taken on the line 11-11 of Fig. 7.

Fig. 12 is a vertical sectional view similar to Fig, 11 and illustrating the mechanically.

operated valve of our invention when shifted' into its lowermost position.

Fig. 13 is an elevational view of the body base plug of our invention showing the manner in which certain pipes are attached there- Figs. 14,15 and 16 are horizontal sectional views taken on correspondingly numbered lines of Fig. 2. p

. Fig. 17 is a horizontal sectional view taken on the line 17-17 of Fig. 3.

Figs. 18 to 25, inclusive are horizontal sectional views taken on correspondingly numbered lines of Fig. 4.

Figs. 26 iand 27 are "horizontal sectional oil lines of Fig. 5.

views taken on correspondingly numbered 1 Figs. 31, 32 and 33 are horizontal sectional trating the complete fluid-motor pump withthe moving parts positioned differently than in Fi 35.

Re erring specifically to the drawings, 40 indicates a deep well in which a casing 41 is placed, the casing 41 being capped by a well casing head 42. Passing downward through the casing head 42 and disposed within the casing 41 is a pump tubing 43.

The lower end of the pump tubing 43 is con-' nected by a coupling 44 to the upper end of the fluid-motor pump 45 of our invention. The pump tubing 43 has a T 46 secured to it above the casing head 42 from which an exhaust pipe 47 leads to suitable storage (not shown). On the extreme upper end of the ump tubing 43 a stufiing-box 48 is provided.

assing downward through the stufling-box 48 and throughout the length of the tubing 43 to where it joins to the motor pump 45 of our invention, as will be described later, is

an operatingfluid supply pipe 50. The upper end of the pipe 50 is'connected to the pressure end of a high pressure pump 51 which draws a clean operating fluid from a source (not shown) and forces it into the upper end of the pipe 50.

The preferredxgxembodiment of our fluidmotor pump 45, which is illustrated in section in 2 to 9 inclusive, has a body 55 which is composed of a shell 56 and a core 57. The shell 56 may be made up of several joints connected by couplin s or it may be formed of asingle piece of tu ,ing as'it is illustrated in the drawings. The core 57 is built up of a number of elements as in the description.

c The shell 56 ha will be made clear} s an up-set annular shoulder 59 formed at its upper end which has outer threads 60 to which the coupling 44 connects. Upper internal threads 61 and lower internal threads 62 are formed in the shoulder 59. A plug 63 formed at the lower end of a novel socket joint member-"'65 is threadedly received into the threads 61. The joint member 65 has a neck 66 which is formed upward from the plug 63 and threadedly receives, at its upper end, a sleeve67. The. ground. cylindrical face sleeve 67 has a formed upon the inner surface of the walls thereof. This will allow thereof and has outward flaring guide-prongs 70 upon the upper end 71 thereof. The lower end of the 'pipe 50 has a cylindrical tube 73 which is ground upon its outer surface to fit the cylindrical face 68 of the sleeve 67. The

ment therewith-upon a pair of complemen- I tary comcal faces formed upon these members, as indicated at 78.

A port 80 is formed in the coupling 44 and a port 81' is formed in the wall of the sleeve 67. A pipe opposite ends welded into the

ports

80 and 81 respectively. When the pump 45 of; our invention is installed, it is lowered into the well 40 upon the lower end of the pump tubing 43. At this time the pipe has not been placed in the tubing 43. The tube 73. however, has been disposed in the sleeve 67 so that communication between the exterior and interior of the tubing 43 through the tube 82 is prevented, thus the interior of the pump 45 is kept clean while it is being installed. The pipe 50 is then'lowered through the tub ing 43 and by rotation is screwed into the tube 73 at the threads 77 so that a seal is efi'ected at the conical faces 78. When it is desired to remove the pump 45 for repairs, the pipe 50 may be elevated sufiiciently to withdraw the tube 73 from the sleeve 67 sometime before the withdrawal of the pump tubing 43 from the well 40 is commenced. A passage is thus opened through the pipe 82 from the interior of the pump tubing 43 to the exterior the oil within the pump tubing 43 to drain outwardly through the pi e 82 into the bottom of the well 40,

" thus t e pump tubing 43 will be empty when withdrawn from .the well and a wet job will be prevented.

The core 57 has an upper tubular member 85 which is threaded intothe thread 62 of the annular shoulder 59. The core 57 also has a lowermost tubular member 86 which is threadedly joined at 87 to an eccentric base block projection body base plug 90. The lower end of the shell 56 is threadedly joined to the plug 90 at The core 57 being of smaller diameter than the inside of the shell 56, a passage space 93 is formed between the core and the shell.

' This passage space 93' is sealed against comopenings provide a passageway munication with the outside of the' shell 56 Open- 59 of the upper end of the shell 56 and these between the space 93 andthe interior of the pumptubing 82 having a union 83 has its 88 formed upward upon amunicates with a 4 A gas cushion member is formed in the upper end of the core 57, as shown in 3. The upper tubular member 85 of the core 57 proceeds downward I tance and. 's threadedly received at 101 in a coupling 102. A sleeve 103 is threadedly received inthe lower end of the coupling 102 and is threadedly aconnecting nipple 105. The nipple 105 is threadedly joined at its lower end by a coupling 106 to a tubular member 107. An inner tube 110 isthreadedly received at 111 in the plug 63 so as to communicate with the lower .end, of the neck 66. The upper inner tube 110 is of considerably smaller diameter than the inside of the member 85 and has a 'ound fit with the inner surface of the sleeve 103, the tube 110 terminating at its lower end in abutment with the nipple 105 and communicating with the interior passageway thereof. A lower inner tube 112 is threadedly secured at its upper end in the lower endof the central passageway of the nipple 105 and depends downward therefrom to within a short distance of the lower end of the tubular member 107 where it threadedly receives a cap 113. Openings 114 are provided in the lower end of the lower inner tube 112 and a screen 115is wrapped about the tube 112 to cover the openings 114. Openings 117 are formed in the lower portion of the tubular member 85. The operation of %he gas cushion member 100 will be described ater.

The lower end of the tubular member 107 is threadedly joined by a coupling 118 to a connector 119. A fluid operated plunger valve barrel 120 is threadedly joined at its Fig.

a considerable dis- H upper end to the connector 119. The valve barrel 120 has a cylindrical valve chamber 121 which has a threaded counter-bore 122 at its upper end in which is screwed a ball check valve 123. The outer end of the threaded bore 122 is screwed upon the connector 119. A threaded counter-bore 1254s formed in the lower end of the valve chamber 121 and threadedly receives a double ball check valve 126. The has an annular recess 127 formed in the body. 128 thereof, which recess communicates through an opening 130 with the passage space 93., A secondarythreaded counterbore valve barrel 120, this counter-bore receiving a lock nut 132 which secures the valve 126 in place in the counter-bore 125. The counter-bore 131 is of such length as to provide a cavity 133 below the nut 132, which cavity communicates with an opening 134 which is formedin the wall of the barrel 120. Operating fluid inlet ports'140 and 141 are formed in the wall of the barrel 120. The connector 119 has a central passageway 142 which comdouble lower check valve 126 131 is formed in the lower end of the cavity 143 formed in -the- 150 and 151 are provided in the wall of the barrel 120 and ports 152 and 153 are formed in the wall of the barrel 120 opposite the

ports

150 and 151 respectively.

A fluid operated valve plunger 160 is slidably disposed in the valve chamber 121 so as to make a fluid-tight fit therewith. In Fig. 4 the valve plunger 160 is shown in its upper position and disposed a given distance abovethe upper end of the lower check valve 126. Annular pockets 161, 162, 163, and 164 are formed in the outer surface of the plunger 160. When the plunger is in its upper position, as shown, the pocket 161 establishes communication between

ports

140 and 148. The

pockets

162 and 163 are not aligned with any ports. The pocket 164 establishes communication between the ports 151 and 153. a

In Fig19 a valve operated opening 166 is shown formed in the wall of the barrel 120 communicating with the chamber 121 at the upper end thereof. In Fig. 24 a valve-operated opening 167 is shown formed in the wall of the barrel 120 communicating with the lower end of the chamber 121.

A threaded upper end 170 of a head block 171 is screwed into the lower end of the threadedcounter-bore 131. Ecceigtrically de-- pending from the upper end 170 of the head block 171 is a stem portion 172, while threadedly secured at 173 upon the lower end of the stem 172 is an upper cylinder barrel 174. A passageway 175 is provided throughout the length of the block 171 to communicate between the cavity 133 and the upper end ofthe upper piston chamber 177, which is formed in the upper cylinder barrel 174. The stem 172 is cut away at 178 to form an enlarged space 179 in the passage space 93 for a purpose which will be described later.

The lower end of the upper cylinder barrel 174 is threadedly secured at 184 to the upper end of an intermediate block 185. A piston rod bore 186 is formed centrally throughout the length of the intermediate block. 185. An annular counter bore 187 is formed in the upper end of-the piston rod bore 186. A threaded opening-188 is formed in the intermediate block 185 to communicate between theexterior thereof and the counter-bore 187.

An upper pumped-fluid. valve member 190 is disposed in the passage space 93 opposite the threaded opening 188. A central T 191 of the valve'member 190 has a nipple 192 which,

is threadedly received in the opening 188. A tubular cagev 194 is threaded upon an upper nipple 195 of the T 191 and confines a ball 196 in seating relation with the u per end of the nipple 195. A connector 198 1s threadedly received in the upper end of the cage 194 and has a cage 199 threadedly received upon its upper end to confine a ball 200 in seating relation with the upper end of the connector 198. A cage 202 is threadedly received upon a lower nipple 203 of the T 191 and has a connector 204 threadedly received in the lower end thereof so that a ball 205 isconfined over a seat formed upon the upper end of the connector 204. A cage 207 is threadedly received upon the lower end of the connector 204 and a connector 209 is threadedly received in the lower end of the cage so that a ball 210 will be confined over a seat formed upon the upper end of the connector 209. The connector 209 has a bonnet 212 threadedly received upon the lower end thereof which secures the upper end 213 of a pumped-fluid inlet pipe 214 to the connector 209. a

'Referring to Fig. 9, there is an opening 218 formed longitudinally through the body base plug, and a lower portion 220 of the upper end thereof. A union 221 connects the upper and

lower pipes

213 and 220. The balls 205 and 210 may beunseated by suction of pumped-fluid inward through the nipple 192, while the

balls

196 and 200 will be seated by such a suction. Movement of pumpedfluid outward through the nipple 192 will cause a reverse action of these balls and permit the pumped fluid to be forced upward out of the cage 199 into the fluid passage space 93. The lower end of the intermediate block 185 is threadedly connected at 223 to the lower tubular member 86 of the body core 57. The. lower tubular member 86 forms the lower piston cylinder 224 of our fluid-motor pump. A counter-bore '225 is formed in the lower end of the piston rod bore 186. A threaded opening 227 is formed in the intermediate block 185 and communicates between the outside thereof and the counter-bore 225. A pumped fluid valve member 229, which is identical in structure to the valve member 190, is threadedly received into the threaded opening 227. Connected to the lower end of the valve member 229, in the same manner as the pipe 213 is connected to the valve member 190, is anupper pipe 230 of a pumped fluid inlet pipe 231. An opening 232 is provided longitudinally through the body base plug 90 and a lower pipe 233 of thevpumped fluld inlet.

pipe 231 connects with the upper e d of the port 232. A union 235 joins the u i iper and

lower pipes

230 and 233.

. pumped-fluid inlet pipe 214 is secured in the 1 An opening 238is formed longitudinally through the body base plug 90' and the base block-projection 88, the lower end of this upper section of pi opening threadedly receivin a plug 239. A branch opening 240 is forme from the opening 238 in the body base plug 90, the branch 240 receiving the lower section 242 of a lower piston cylinder operating-fluid pipe 243. An 244 is connected to the section 242 by a unlon 245 and rises upward through the passage space 93. For convenience in assembling, the upper pipe section 244 has a union joint 246 which is disposed in an enlarged portion of the passage space 93 formed by the recess 179. The upper end of the pipe 244 is connectedto both of the

ports

149 and 151 as shown in Fig. 4. Thus a passageway is provided between both of the

ports

149 and 151, through the pipe 243 and the

openings

240 and 238, into the lower.

end of a lower piston chamber 250 formed in the cylinder 224.

Referring to Fig. 4, an upper operated fluid conduit 252 connects to both of the

ports

148 and 150, as shown, and provides a passageway between these ports and the opening 134 into which the lower end oi the pipe 252 is secured. The passageway thus formed by the pipe 252 continues through the cavity 133 and the opening 175 into the upper end of the upper piston chamber 1 7, as shown in Fig. 5.

A plunger member 260 is disposed in the upper and lower piston.

chambers

177 and 250 and in the'piston rod bore 186 which connects these chambers. The plunger member 260 comprises an upper piston 261 adapted to slide in the upper piston chamber 177, a lower piston 263 adapted to slide in the lower piston chamber 250, and a piston rod 264 which is adapted to slide in the piston rod bore 186 and'whichconnects the

pistons

261 and 263. The piston rod 264 com rises a 'plston rod sleeve 266 which is threa edly received at its opposite ends in the inner ends of the

pistons

261 and 263, and a tie rod 267 which is disosed within the sleeve 266 and which proects therefrom through central apertures in the

pistons

261 and 263 to the outer ends of these pistons, where it threadedly receives nuts 270 which are turned down upon the outer ends of the pistons in cavities 271 formed therein. The plunger member 260 is adapted to reciprocate between lowermost and uppermost positions.

In Figs. 5 to 8 inclusive, the plunger member 260 is shown in substantially its uppermost position. v A mechanically operated valve 275 rests in anfi'annular pocket 276 formed in the outer surface of the piston rod 264. In the present embodiment this pocket 276 is formed by cutting out a portion of the piston rod sleeve 266 and'interposing a sleeve 278 of considerably smaller diameter than the sleeve 266.in-place of the removed portion. The opposite ends of the sleeve 27 8 are threadedly received into the ends of the remaining upper and lower portions of the sleeve 266. The mechanically operated valve 275 has a sleeve 280, the outer surface of which is ground to form a fluid-tight slidin fit wit the surface of the bore 186. The va ve sleeve 280 has upper and lower

annular pockets

281 and 282 formed in the outer surace thereof. The inside diameter of the sleeve 280 is greater than the outer diameter of the sleeve 278 so that the plunger member 260 may be shifted longitudinally relative to the valve sleeve 280 within the limits of the space 27 6 without the sleeve 280 being affected by movement of the plunger member 260 through pressure of any fluid which might be disposed in the space 276. Thus when the plunger 'member 260 commences a downward movement from the uppermost position in which it is shown in Fig. 6, the sleeve 280 will remain in the position shown until its upper end is contacted by a shoulder 283 of the piston rod 264. Also, when the plunger member 260 commences an upward movement from the lowermost position inwhich it is shown in 12, the sleeve 280 will remain in the position shown untilits lower end is contacted by a shoulde r 2831 of the piston rod 260. Thus, the sleeve 280 and

shoulders

283,2831 together constitute one form of lost motion connection between the piston rod and the valve 27 5;

The mechanically operated valve 275 is adapted to set up operating fluid circuits at each of the upper and lower positions of the plunger member 260 whlch will cause the reversal of the position maintained by the valve plunger 160 during the stroke of the plunger member, made while it was approaching thatend position. For this purpose, upper and lower sets of ports are provided in the intermediate block 185 which open into the piston rod bore 186 and certain 281 and 282 to effect the circuitsabove mentioned. Referring to Figs. 10 and 11, it will be seen that an upper supply port 290 and a lower supply port 291 are connected by an operating fluid supply pipe 292 to the port 185 which receives operating fluid through the port 145 from the cavity 143. Connecting

ports

295 and 296 are formed in the intermediate block 185, as shown in Figs. 10 and 11, which are connected by a pipe 297 to the port 167 formed in the pl er valve barrel 120 at the lower end of the p unger chamber 121. Connecting

ports

300 and 301 are conones of which are connected by the pockets nected by a pipe 302 to the port 166 formed by the pump 51 at any pressure desired, this preferably being about five hundred pounds to the square inch. This operating fluid flows downward through the pipe 50, the tube- 73, the neck 66, the tube 110, the connector 105,'the tube 112, the openings 114, the connector 142, and flows from the cavity 143 into the

feed pipes

146 and 292. In Figs.

4 and 36 the valve plunger 160 is shown in its upward position in which it sets up a circuit for causing the plunger member 260 to be moved from its upper to its lower position. The moving of the valve plunger to its upper position, as shown in Figs. 4 and 6, is effected by an operating fluid circuit which is set up by the mechamcally operated valve 275' by virtue of said valve 27 5 having been actuated to the position shown in Figs. 6 and 10 by the plunger shoulder 2831. The fluid operated valve actuating circuits thus set up are as follows:

Operating fluid is admitted from the cavity 143, through the supply pipe 292, the port 290, the pocket 281, the port 295, the pipe 297, and the port 167 to the lower end of the valve plunger chamber 121. The pressure of the operating fluid thus admitted into the lower end of the chamber 121 is intended to move the plunger 160 into the position in which it is shown in Figs. 4 and 36. The fluid previously disposed above the plunger 160 was exhausted from the upper end of the chamber 121, through the port 166, the pipe 302, the port 300, the pocket 282, and the port 305 -into the exhausted fluid passage space 93. Due to the plunger 160 being thus moved into its upper position a pump operating circuit is set up, as follows:

Operating fluid flows .from the pipe 146 through the port 140, the pocket 161, the port 148, the pipe 252, the opening 134, the cavity 133, and the opening 175 into the upper end of the upper piston chamber 177. Here the introduction of operating fluid tends to force the plunger member 260 downward to the position shown in Fig. 35 by exerting a pressure upon the upper end of the piston 261. As the plunger member 260 goes downward, well oil, which has been drawn into the lower end of the upper chamber 177, will be exhausted around the

check balls

196 and 200 into the,

exhaust fluid passage space 93. Used operating fluid which is disposed in the lower end of the lower piston chamber 250 will be exhausted through the passage 238, the passage 240, the pipe 243, the pipe 151, the pocket 164 and the port 153 into the exhaust fluid passage space 93. Inasmuch as the operating fluid is maintained at a much greater pressure per square inch than the pressure of the fluid in the passage space 93, the movement of fluids is accomplished as just described. As the plunger member 260 moves downward, the lower pair of check valve balls of the valve 229 are unseated to admit well oil upward through the opening 218, the pipe 214, Y

of the plunger 160 before the circuits efl'ecting this throw are out 01f by downward movement of the sleeve 280. This insures positive action of our fluid-motor pump and prevents faulty functioning of the fluid-operating circuits set up by the mechanical valve 275 to inove the fluid-operated plunger 160 to cause the reciprocation of the plunger member 260. When the plunger member 260 arrives at the lower position, shown in Fig. 35 the valve sleeve 280 is positioned as shown in Fig. 12, so that the pocket 281 communicates between the exhaust port 306 and the connecting port 296 of the pipe 297 so that fluid beneath the valve plunger 160 may be exhausted through the port 167, the pipe 297, the port 296, the pocket 281 and the port 306 into the exhaust fluid passage space 93. The pocket 282 communicates between the

ports

291 and 301 so that operating fluid flows through the pipe 292, the port 291, the pocket 282, the port 301, the pipe 302, and the port 166 into the upper end of the valve chamber 121, thus moving the plunger 160 downward in the chamber 121 to the position shown in Fig. 35 so that the following circuits will be set up.

Fluid may now be exhausted from the upper end of the upper piston chamber 177 through the passage 175, the cavity 133, the opening 134, the pipe 252, the port 150, the pocket 163 and the port 152 into the exhaust fluid passage space 93. Operating fluid may now flow from the supply pipe 146 through the port 141, the pocket 162, the port 149, the

pipe 243, the opening 240, and the opening 238, into the lower end of the lower piston chamber 250, thus causing the downward movement of the plunger member 260 tobe halted and its upward movement commenced. The upward movement of the plunger member 260 continues until it has reached the po-' sition in which it is shown in Fig. 36 of'the drawings, at which time the mechanically operated-valve 275 will set up the circuits described which cause the-plunger 160 to move into its its upward position in which it is shown in Figs. 4 and 36. Thus a complete cycle of operation of our fluid-motor pump is ended and the pump parts are in position to commence automatically a second cycle. The pump is designed so that in event it should be shut 011' and stopped on dead center, it may be forced from dead center va simple operation, which is as follows:

If for any reason should the power cease and the valve plunger 160 should be in such a position that all ofthe ports thereof are. shut tubing 43 is used as the power line and the position shown in Fi drawings.

ofi, the power fluid is reversed, that is, tple t e operating fluid supply pipe 50 is used as the exhaust line. Fluid, nder pressure, will pass through the opening 130 in the plunger valve barrel 120, unseating the balls of the lower check valve 126. The fluid under pressure flows into the space in the barrel 120 below'the' valve 160 and forces it upward into s. 4 and 36 of the The upper c eck valve 123 is opened at this time and any operating fluid above the valve 160 will pass therethrough' into the opening 142. This moves the valve 160 so that theports are opened,whereaf terthe power fluid may be forced through its proper line and the pump set into operation.

. The shell and core construction of the body of our pump is of especial importance, as it provides a fluid passage space which may not only be used for an exhaust fluid connec ng passage but also as a piping space in which piping may be disposed to furnish all of the necessary longitudinal ducts for conveying fluid over a considerable longitudinal distance in the fluid-motor pump. Such a structure eliminates all necessity for forming and roofing channels in the metal of the body for the purpose of providing these lon- This eliminates one of the gitudinal ducts.

most expensive and objectional features of previously produced fluid-motor pumps.

It will also be noted,that the dquble gas pocket cushidnstructure is provided in the upper end of the core ofthe pump body. A

a gas pocket is thus provided to communicate tons;

with the column of operating fluid in the pipe and another gas pocket isprovided to communicate with the column of exhausted fluid disposed in the pump tubing 43.

These gas pockets tend to dampen any pulsation in the flow of operating fluid or exhausted fluid due to the reciprocating of the fluidmotor pump and thus bring about a relatively continuous flow in the operating and exhausting columns of fluid. This is a feature of decided advantage inasmuch as an irregular flow of fluid absorbs a much greater quantity of energy than a continuous flow of the same amount of fluid. This difference is due to the expenditure of energy necessary in overcoming-the inertia of the fluid. during the ,accelerating portion of each pulsation.

We claim as our invention:

1. In a deep well fluid-motor pump, the combination of: a body having an outer shell and a central core disposed within said shell to form a passage space between said core and said shell, there being formed. in said core a pair of aligned piston chambers and a piston rod bore connecting said chambers; pistons dis osed in said chambers; a piston rod dispose check-valved means for supplying a fluid to be piimped to the inner ends of said piston chambers;

'valve with said passage space; 'chanically operated in said bore and connecting said pispermitting pumped fluid to be exhausted from the inner ends of said piston chambers into said passage space; means for supplying an operating fluid alternately to the outer ends of said chambers to cause the reciprocation of said plunger member; and means ermitting the exhaust of used operating uid from the outer end of each of said chambers into said passage space when operating fluid is being admitted .into the outer end of opposite chamber.

2. In a deep well combination of: a body having an outer shell and a central core disposed within said shell to form a passage space between said core and said shell, therebeing formed in said core a pair of aligned a piston rod bore connecting said chambers; pistons disposed in said chambers; a piston rod disposed in said bore and connecting said pistons check-valved means a fluid to be pumped to the inner ends of said piston chambers; permitting pumped fluid to be exhausted from'the inner ends of said piston chambers check-valved means for fluid-motor pump, the

piston chambers and for supplying check-valved means for. I

into said passage space; a fluid-operated valve; means for conveying an operating fluid to said valve; conduit means connecting said fluid valve to the outer ends of said pis- ,ton chambers, there being a passageway formed in said body to connect said fluid and a mevalve moved by said plunger member to admit operating fluid into shifting relation with said fluid valve so that said fluid valve will admit operating fluid into the outer end of one piston chamber and permit the exhaust of used operating fluid from the outer end of the opposite chamber into said passage space so as to cause the auto-- matic reciprocation of said pllmger member.

3. In a deep well fluid-motor pump, the combination of: a' body havinga pair of aligned piston chambers and a vpiston rod bore connecting said chambers; pistons disposed in said chambers; a piston rod disposed 111 said bore and connecting said pistons;

check-valved means for supplylng a fluid to be pumped to the inner ends of said piston chambers; check-valved meansfor permitbers to cause the reciprocatlon of said plungermember; and means permitting the. ex-

haust of used operatingfluid from the outer end of each of said chambers when operating fluid is being admitted into the outer end of; the opposite chamber.

4. In a deep well said fluid-motor pump, the combination of: a body having outer shell and a central core disposed within shell to form a passage space between said I V said operating fluid supply meanscomprises'.

core and said shell, there being formed in said core a pair of aligned piston chambers and a piston rod bore connecting said chambers; pistons disposed in said chambers; a

piston rod disposed in said bore-and connectlng said pistons; check-valved means for supplying a fluid to be pumped to the inner ends of said piston chambers; check-valved means for permitting pumped fluid to be exhausted from the inner ends of said piston chambers into said passage space; a fluidoperated valve; means for conveying an operatlng fluld to 881d valve; conduit means connecting said fluid valve to the outerends of said piston chambers, there being a passageway formed in said body to connect said A fluid valve with said passage space ;-.and a mechanically operated valve provided upon said piston and moved by said plunger member in said piston bore'to admit-operating fluid into shifting relation with said fluid valve so that said fluid valve ,will admit opcrating fluid into the outer end of one piston chamber and permitthe exhaust of used operating fluid from the outer end of the opposite chamber into said passage space so asto cause the automatic reciprocation of said plunger member. p v

5. A deep well fluid-motor pump comprising: a shell; a core disposed in said shell and secured thereto at its opposite ends to form an exhaust passage space between said shell and said core, there being formed in said core a pair of piston chambers, a piston rod bore connecting said piston chambers, and a fluidoperated valve chamber; a plunger member. comprising pistons disposed in said piston chambers and a piston rod disposed in said piston rod bore and connecting said pistons; a fluid-operated valve plunger disposed in said valve chamber an operating fluid supply means; a pipe disposed insaid passage space valve chamber to said exhaust valve chamber; pipes disposed in said exhaust passage space and connecting said Valve chamber to the outer ends of said piston chambers, a port being formed joining said passage space; check-valved pipes disposed in said passage space and connecting the inner ends of said piston chambers with the exterior of said shell for supplying fluid to be pumped to said chambers; check-valved pipes connecting the inner ends of said piston chambers with said exhaust passage space; an exhaust conduit connecting with said exhaust passage space; a mechanically operated valve sleeve mounted upon said piston rod to slide in said piston bore with the reciprocationof said plunger member; and pipes disposed in said exhaust passage space and connecting said operating fluid supply means with said piston bore and connecting said is ton bore with the ends of said valve cham er.

6. A combination as in'claim 5 in which a vertical tube disposed'axially withinsaid exhaust conduit and having: a sleeve disposed about said tube and spaced therefrom and sealed thereto at its upper end and medially downward therefrom to form an upper chamber and a lower chamber, ports being formed in Vsaidsleeve' to conimunicate between the piston rod bore and connecting said pistons;

an operating fluid supply means; flu1d operated valve means for. admitting operating fluid into outer ends of said chambers to reciprocate said plunger member; a mechanical valve comprising a sleeve resting in an annular cavity formed in the surface of said piston rod and fitting the surfaceof said bore, there being annularpockets formed in the outer surface of said sleeve,.and rts formed in said body opening into said plston rod bore, so that certain of said ports are connected by said pockets toward the endof the strokes of said plunger member; conduit means connecting certain of said ports with said fluid supply means and other of said ports with said fluid operated'valvemeans so as to admit operating fluid into operating relation with said fluid operated valve means when said plunger member near the endsof its strokes, and valved inlets and outlets for the piston chambers. r

8. A deep well fluid-motor pump having: a body, there being formed in said body a pair of aligned piston chambers connected by a piston rod bore; a plunger member comprising ,pistons slidably disposed in said 7 chambers and a piston rod slidably disposed in said piston rod bore and connecting said pistons; an operating fluid supply means; fluid irperated valve means for admitting operating fluid into outer ends ofsaid chambers to reciprocate said plunger member; mechanical valve means connected with and operated by movement of said plunger member to bring said operating fluid supply means into operative relation with. said fluid operated valve means as said plunger member approaches the limits of its strokeso as to cause the automatic reciprocation of said plunger member and check valve means connected to the inner ends of said chambers whereby well fluid may be pumped when said plunger member reciprocates.

9. A- deep well fluid-motor pump having:

' prising vpistons slida ass-1,406

a body, there being formed in said badly a pair of aligned piston chambers'connec by a piston rodbore; a plug: member comly in said ably chambers and a piston rod sli insaid piston rod bore and connecting said pistons; an operating fluid supply means; op-

erating fluid valve means controlled by movement of said plunger member so that said means admits operating fluid alternately into v the outerends of said chambers so as to cause the automatic reciprocation of said plungermember; and check valve means connected to the inner ends of said chambers whereby well fluid may be pumped when said plunger member reciprocates.

10. A deep well fluid-motor pump having: a body, there being formed in sald body! a pair of aligned piston chambers connected bya piston rod bore; a plunger member comprising pistons slidably disposed in said chambers and a piston rod slidably disposed in said piston rod bore and connecting said pistons;

an operating fluid supply means; fluid operated valve means for admitting operating fluid into outer ends of said chambers to reciprocate said plunger member; mechanical valve means operated by movement of saidplunger member to bring said operating fluid supply means into operative relation 'with' said fluid operated valve means as said plunger member approaches the 'limitsof its stroke so as to cause the automatic reciprocation of said plunger member, said mechanical valve means having lost motion relative to said lunger member to insure actuation of said uid operated valve means; and check valve means connected to the inner ends of said chambers whereby well fluidmay be pumped when said plunger member reciprocates.

11. A deep well fluid-motor pump having:

a body, there being formed in sald bed? a pair of aligned piston chambers connecte by a piston rod bore; a plunger member comprising pistons slidably disposed in said chambers and a piston rod slidably disposed in said piston rod bore andlconnecting said pistons; an operating fluid supply means; flu1d operated .valve, means for admitting operating fluid into outer ends of said chambers to reciprocate said plunger member; mechanical valve means operated by movement of said plunger member to bring said operating fluid supp y means into operative relation with said fluid operated valve means as said plunger member approaches the limits of its stroke so as to cause the automatic reciprocation of said plunger member; check valve means connected to the inner ends of said chambers whereby well fluid may be pumped when said plunger member reciprocates exhausted fluid conduit means for conducting fluid from said fluid motor means where y said fluid operated valve ump; and emergency valve means .may be moved to a given 0 rative position by reversing the direction flow of uid through said exhausted fluid conduit means and said operating fluid supply means.

12. .A deep well flui -motorpump comprising a body having an'outer shell and a core disposed within said shell to forma. assage spacebetween the core and shell, t ere being formed in said core a pair of aligned piston chambers and a piston rod bore connecting saidchambers, pistons dis vosed in said chambers, a piston rod-dispose in said bore and connecting said pistons, checkvalved means for supplying a fluid. to be pumped to one end of each piston chamber, check-valved means for permitting pumped fluid to be exhausted from each of said ends into said passage space, means for supplyin a an operating fluid alternately to the other enis of said chambers to cause the reciprocation of the plunger member, and means rmitting the exlraust of used operating uid from said other ends into said passage space when operating fluid is being admitted into the first mentioned end ofthe o posite chamber, and a mechanically operate valve moved by the plunger member and controlling the flow of an operating fluid to and from the operating fluid supply and exhaust means. 13. A deep well fluid-motor pump comprising a body having an outer shell and a core disposed within said shell to form a passage space between said core and said 1 duit means connecting said fluid valve to the other ends of the piston chambers, said-body rovided with a p uid-operated 'valve w1ththe passage space, and a mechanically operated valve moved by the plunger member to admit operating fluid into shifting relation with the 'dv-olperated valve so that saidfluid-operated ve will admit operating fluid into; oneIof the piston chambers andpermigtheefxhaust of used operating fluid from the o posite chamber into said. space to e 14. A deep well i h V prising a body having an-Iouter shell and'a' core disposed within said shell to form a assage s ace between the core and thee ell, there being formed in said core a pair ';of

aligned piston chambers and a bore connecting said chambers, p stons way connecting the I usage ectautomatic'reciprocatlon o the plun%er anember. 7 v ui -motor um com-- P P .F

piston rod posed in said chambers, a piston rod disposed in said bore and connecting said pistons, check-valved means for supplying a fluid to be pumped to one end of each of the piston chambers, check-valved means for permitting pumped fluid to be exhausted from said end of each chamber into said pas sage space, a fluid-operated valve, means for conveying an operating fluid to said valve, conduit means connecting the fluid-operated valve to one end of each piston chamber, said body provided with a passageway to connect the fluid-operated valve with said passage space, and a mechanically operatedvalve provided upon said piston and moved by the plunger member in said piston ore to admit operating fluid into shifting relation with the fluid-operated valve so that said fluid-operated valve will admit operating fluid into one of the last mentioned ends and permit the exhaust of used operating'fluid from the other of said last mentionedends into the passage space to effect automatic reciprocation ofthe plunger member.

15. A deep well fluid-motor pump comprising a shell, a core disposed in said shell and secured thereto at its opposite ends to form an exhaust passage space between the shell and the core, there being formed in said core a pair of piston chambers, a piston rod bore connecting said piston chambers and a fluid-operated valve chamber; a plunger member comprising pistons disposed in piston chambers and a piston rod disposed in the piston rod bore and connecting said pistons; a fluid-operated valve plunger disposed in the valve chamber; an operating fluid supply means; a pipe disposed in said passage space and connecting said supply means with said valve chamber; pipes disposed in said exhaust passage space and connecting said valve chamber to the outer ends of said piston chambers, a port being formed joining said valve chamber to said exhaust passage space; check-valved pipes disposed in said passage space and connecting one end of each piston chamber with the exterior of the shell for supplying an operating fluid to said chamber; check-valved pipes connecting the said ends of the piston chambers with the exhaust passage space; an exhaust conduit connecting with the exhaust passage space; a mechanically operated valve sleeve, mounted on the piston rod to slide in the pistonbore with the reciprocation of the plunger member; and pipes disposed in the exhaust passage space and connecting the operating fluid supply means with the piston bore and connecting said piston bore with the ends of the valve chamber.-

' 16. A deep well fluid-motor pump comprising spaced operating liquid and exhaust liquid conduits, one inside of the other, and a tube between said conduits sealed at its ends and provided with a port near its lower end communicating with the bore of the outer conduit to harmonize fluctuations in the resistance to passage of liquid through said outer conduit and cause a substantially uni- (fiorm flow of liquid through said outer conuit.

In testimony whereof, we have hereunto set our hands at Los Angeles, California, this 15th day of July, 1926.

BERNARD H. SCOTT. SAMUEL E. ROSS.