Abstract:
A system for well fluid treatment, the system being transportable, the system including a base, a support structure on the base, a brace apparatus connected to the base and to the support structure for bracing the support structure during movement of the system, the brace apparatus releasably secured to the support structure and releasably secured to the base, at least one holding tank on the base for holding well fluid to be treated, from an active rig well fluid system and the well fluid to be treated including solids, centrifuge apparatus for centrifuging a mixture of well fluid and solids from the at least one holding tank, producing reusable fluid, a first pump apparatus for pumping well fluid and solids from the at least one holding tank to the centrifuge apparatus, and a centrifuge support on the base for supporting the centrifuge apparatus. The system including a mixing tank for mixing materials in aqueous solution for introduction to well fluid in the at least one holding tank, and a second pump apparatus for pumping materials in aqueous solution from the mixing tank to the at least one holding tank. The system wherein the materials in aqueous solution include flocculant and coagulant. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention is directed to on-site treatment of drilling fluids, mobile systems for treating drilling fluids, methods of their use, and, in certain particular aspects, to such systems and methods that have erectable parts to facilitate fluid processing. 
         [0003]    2. Description of Related Art 
         [0004]    The prior art discloses a wide variety of systems for treating drilling fluids and methods of their use; for example, and not by way of limitation, see the systems and methods in U.S. Pat. Nos. 7,296,640; 7,022,240; 6,881,349; 6,863,809; 6,808,626; 6,855,261; 6,391,195; 6,193,070; 6,059,977; 5,093,008; 4,595,422; 4,536,286; and 4,474,254—all of said patents incorporated fully herein for all purposes. 
         [0005]    Oil and gas well exploration involves the generation of various fluids and of waste products, including, e.g., fluid wastes, spent drilling fluids, and fracture or return fluids from various operations. Fluids, etc. have been treated and processed both on-site and off-site. U.S. Pat. No. 4,465,598 discloses an off-site method for the precipitation of metals including iron, nickel, chromium, cobalt, and manganese in oil and gas well heavy brines which have been filtered initially to remove solids. U.S. Pat. No. 4,634,533 discloses an oil and gas well brine treatment including an initial oxidizing treatment to convert iron to the ferric state. U.S. Pat. No. 5,814,230 describes an apparatus and method for separation of solids from liquid for use with different processes and describes the separation of solids from a liquid flow using an endless conveyor carrying screen filters which dredge gravity-settled solids from the bottom of a settling tank and filter solids suspended in the flowing liquid. The solids are further dewatered while on the filters using a combination of vibration and air streams. U.S. Pat. No. 4,436,635 describes a filtering process for filtration of oil and gas well treatment fluids. 
         [0006]    Treating fluids, etc., off-site can be uneconomical due to transportation costs. Consequently mobile systems for on-site treatment have been developed, some of which attempt to produce fluid re-usable on-site. U.S. Pat. No. 4,895,665 discloses on-site methods for treating and reclaiming oil and gas well working fluids and the related drilling pits and methods of chemical treatment and filtration of oil and gas well working fluids within associated drilling pits. These methods include preparing a drilling pit for closure through reduction of the fluid content in sludge which is formed in the drilling pit. Treated water can be reused. 
         [0007]    U.S. Pat. No. 5,093,008 describes on-site processes and apparatus for recovering reusable water from waste drilling fluid. The processes involve a dewatering process and apparatus for concurrent reutilization of water in waste drilling fluids from an active drilling operation that includes a storage area, an intermixer for introducing treatment chemicals into the waste drilling fluids, and a centrifuge. Flocculation is chemically induced in the waste drilling fluids as they pass through the intermixing needs for introducing treatment chemicals into the waste drilling fluids. The waste drilling fluids are then transferred to a centrifuge where solid waste is separated from clear, reusable water. The water is returned to the storage area and may be chemically adjusted prior to being returned to the drilling rig. 
         [0008]    U.S. Pat. No. 4,536,286 describes a self-contained, portable waste treatment system for hazardous and non-hazardous waste with a pair of mixing tanks. Solids are removed from fluid waste streams by flocculation and related solids deposition. 
         [0009]    U.S. Pat. No. 7,022,240 discloses an apparatus and method for on-site treatment and reclamation of oil and gas well waste water or fracturing fluids. The mobile treatment process and apparatus provide both chemical precipitation and filtration to treat the drilling fluid waste to a technically and environmentally acceptable level allowing for reuse. Alkaline treating agents are applied to the drilling waste fluids, as they are pumped through the treatment apparatus, to increase the pH of the fluid waste to a preferred pH range and to also cause selective soluble contaminants in the fluids to form a precipitate. The waste fluid is allowed to clarify as the precipitate of insoluble contaminants, through flocculation, settle and form a sludge at the bottom of the drilling pit. The clarified fluids are then filtered to satisfy applicable industry and environmental requirements. 
         [0010]    Single skid mounted apparatus for providing all the components necessary to treat used drilling mud and return a clarified liquid for reuse in an active mud system are disclosed in prior references; e.g., see U.S. Pat. Nos. 4,536,286; 4,474,254; 5,582,727; 6,391,195; and 6,863,809. For example, U.S. Pat. No. 4,536,286 discloses a transportable waste treatment which is completely mobile and capable of treating high mud volumes. This system is self-contained having chemical storage, chemical pumps, sludge pumps, water pumps, laboratory, centrifuge, conveyors etc. and has weight, height and width suitable for highway travel. A skid incorporates three settling tanks and two chemical tanks for flocculation. Waste liquids containing solids enter a first settling tank and are mixed with flocculation chemicals. Solids settle to the tapered bottom of the tank for collection by a suction located at the apex of the tank bottom. Partially clarified liquid from the first settling tank overflows a weir to the next adjacent settling tank and similarly for the second to the third settling tank. 
         [0011]    U.S. Pat. No. 5,582,727 discloses a single structural skid with four settling tanks, each equipped with a shaker and a de-silter. Used drilling mud is routed sequentially from tank to tank. Partially clarified liquid is decanted over weirs to each tank in succession. Fixed suction pumps extract settled solids from the bottom of each tank and route them to the de-silter of each additional and successive tank. Foster does not practice flocculation. 
         [0012]    U.S. Pat. No. 6,391,195 discloses an apparatus for cleaning clearwater drilling muds and a process for treating used drilling mud, particularly that produced during clearwater drilling. A structural and highway transportable skid has two or more settling tanks connected in succession. Flocculation aids settling of solids to the bottom and clarified liquid forms at the surface. Clarified liquid flows from one tank to the next successive tank. Clarified liquid is produced from the last of the successive settling tanks. The tanks have flat bottoms. Passageways extend between each successive tank for gravity-flowing liquid from one tank to successive settling tank. A solids tank or centrifuge is also mounted within the skid. The solids and settling tanks are located for weight-balancing. A rotational suction is positioned in the bottom of each settling tank and having one or more radially extending conduits which rotate about an axis and have inlets at their distal ends which traverse an inscribed circular path about the periphery of the tank&#39;s bottom. Collected solids are directed to the solids tank and a drag conveyor transporting solids product outside the skid. 
         [0013]    There has long been a need, recognized by the present inventors, for effective and efficient systems for on-site treatment and processing of well fluids. There has long been a need, recognized by the present inventors, for effective and efficient unitized skid-mounted systems for processing well fluids with centrifuge apparatus. 
         [0014]    U.S. Pat. No. 6,863,809 discloses transportable drilling fluid cleaning systems for removing solids from drilling fluid at a drill site comprises a platform for transporting the system. A bin region on the platform retains solids from the drilling fluid. A settling tank on the platform separates the drilling fluid into an upper fluid fraction having a reduced concentration of solids and a lower solids fraction having a higher concentration of solids as the drilling fluid flows from an inlet chamber for receiving drilling fluid to at least one other chamber. A stand on the platform supports at least one centrifuge for separating the solids from the drilling fluid, the stand being movable between stored and operating positions. The system provides a self-contained unit that is easily transportable on a flat bed truck to provide all the ancillary equipment necessary for solids control at the drill site. In certain aspects such systems include: a platform for transporting the cleaning system to a drill site; a bin region on the platform to retain solids from the drilling fluid; a settling tank on the platform having an inlet chamber to receive drilling fluid and at least one other chamber, the settling tank acting to separate the drilling fluids into an upper fluid fraction having a reduced concentration of solids and a lower solids fraction having a higher concentration of solids as the drilling fluid flows from the inlet chamber to at least one other chamber; and a stand on the platform to support at least one centrifuge for separating the solids from the drilling fluid, the stand being movable between a stored position during transport of the platform and an operating position. In certain of these systems, the platform is skid loadable onto a trailer towable by a vehicle to move the system as a unit. 
       BRIEF SUMMARY OF THE PRESENT INVENTION 
       [0015]    The present invention discloses, in certain aspects, systems for treating well fluids which are easily transportable; which include erection apparatus for raising system components to facilitate their positioning and operation; and which include removable bracing structures for transport. 
         [0016]    In certain aspects, such systems require no auger apparatus to move material. In certain aspects, such systems employ at least one or one or more cone-bottom tanks with a feed well from which top fluid is skimmed to an adjacent tank via a baffle. The conical bottom converges and concentrates solids for removal or for feed to one, two, or more centrifuges for further processing. In certain particular aspects, using such cone tanks, barite recovery is enhanced since there is one primary suction area or point within the tank. This is also beneficial in oil-based mud solids reduction (stripping) operations to concentrate solids. In such systems, optional agitation enhances chemical and solids/fluid blending and inhibits the accumulation and the undesirable build up of solids on the tank bottoms. 
         [0017]    In certain aspects, systems according to the present invention include raising apparatus for raising a centrifuge support with one or more centrifuges thereon. The centrifuge support has multi-part telescoping vertical legs and the raising apparatus raises the centrifuge support up vertically as the legs telescope out vertically. 
         [0018]    In certain aspects, such systems require relatively less space than certain prior systems. In certain aspects systems according to the present invention weigh about 53,000 pounds, including a centrifuge and can fit on a 43 foot long skid; whereas certain prior systems weigh about 57,000 pounds without a centrifuge. 
         [0019]    Accordingly, the present invention includes features and advantages which are believed to enable it to advance drilling fluid treatment technology. Characteristics and advantages of the present invention described above and additional features and benefits will be readily apparent to those skilled in the art upon consideration of the following detailed description of preferred embodiments and referring to the accompanying drawings. 
         [0020]    What follows are some of, but not all, the objects of this invention. In addition to the specific objects stated below for at least certain preferred embodiments of the invention, there are other objects and purposes which will be readily apparent to one of skill in this art who has the benefit of this invention&#39;s teachings and disclosures. It is, therefore, an object of at least certain preferred embodiments of the present invention to provide: 
         [0021]    New, useful, unique, efficient, non-obvious transportable systems and methods of their use for on-site treatment of well fluids, including drilling fluids and spent drilling fluids with drilled cuttings; 
         [0022]    Such systems and methods with erection apparatus for raising system components vertically to facilitate their positioning and operation; and 
         [0023]    Such systems and methods with the system parts braced with releasable bracing apparatus for stability during movement of the system, e.g. during transport to a remote site. 
         [0024]    Certain embodiments of this invention are not limited to any particular individual feature disclosed here, but include combinations of them distinguished from the prior art in their structures, functions, and/or results achieved. Features of the invention have been broadly described so that the detailed descriptions that follow may be better understood, and in order that the contributions of this invention to the arts may be better appreciated. There are, of course, additional aspects of the invention described below and which may be included in the subject matter of the claims to this invention. Those skilled in the art who have the benefit of this invention, its teachings, and suggestions will appreciate that the conceptions of this disclosure may be used as a creative basis for designing other structures, methods and systems for carrying out and practicing the present invention. The claims of this invention are to be read to include any legally equivalent devices or methods which do not depart from the spirit and scope of the present invention. 
         [0025]    The present invention recognizes and addresses the problems and needs in this area and provides a solution to those problems and a satisfactory meeting of those needs in its various possible embodiments and equivalents thereof. To one of skill in this art who has the benefits of this invention&#39;s realizations, teachings, disclosures, and suggestions, other purposes and advantages will be appreciated from the following description of certain preferred embodiments, given for the purpose of disclosure, when taken in conjunction with the accompanying drawings. The detail in these descriptions is not intended to thwart this patent&#39;s object to claim this invention no matter how others may later attempt to disguise it by variations in form, changes, or additions of further improvements. 
         [0026]    The Abstract that is part hereof is to enable the U.S. Patent and Trademark Office and the public generally, and scientists, engineers, researchers, and practitioners in the art who are not familiar with patent terms or legal terms of phraseology to determine quickly from a cursory inspection or review the nature and general area of the disclosure of this invention. The Abstract is neither intended to define the invention, which is done by the claims, nor is it intended to be limiting of the scope of the invention in any way. 
         [0027]    It will be understood that the various embodiments of the present invention may include one, some, or all of the disclosed, described, and/or enumerated improvements and/or technical advantages and/or elements in claims to this invention. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         [0028]    A more particular description of embodiments of the invention briefly summarized above may be had by references to the embodiments which are shown in the drawings which form a part of this specification. These drawings illustrate certain preferred embodiments and are not to be used to improperly limit the scope of the invention which may have other equally effective or legally equivalent embodiments. 
           [0029]      FIG. 1A  is a side view of a system according to the present invention. 
           [0030]      FIG. 1B  is a top view of the system of  FIG. 1A . 
           [0031]      FIG. 1C  is a perspective view of part of the system of  FIG. 1A . 
           [0032]      FIG. 1D  is a side view of part of the system of  FIG. 1A . 
           [0033]      FIG. 1E  is a top view of part of the system of  FIG. 1A . 
           [0034]      FIG. 1F  is a side view of part of the system of  FIG. 1A . 
           [0035]      FIG. 1G  is a perspective view of part of the system of  FIG. 1A . 
           [0036]      FIG. 1H  is an end view of the system of  FIG. 1A . 
           [0037]      FIG. 1I  is an end view of the system of  FIG. 1A  with part of the system raised. 
           [0038]      FIG. 1J  is a perspective view of part of a centrifuge support according to the present invention. 
           [0039]      FIG. 1K  is a top view of the support of  FIG. 1J . 
           [0040]      FIG. 1L  is a perspective view of part of a centrifuge support according to the present invention. 
           [0041]      FIG. 1M  is a top view of the support of  FIG. 1L . 
           [0042]      FIG. 1N  is a perspective view of part of a centrifuge support according to the present invention. 
           [0043]      FIG. 1O  is a top view of the support of  FIG. 1L . 
           [0044]      FIG. 2  is a perspective view of a tank of the system of  FIG. 1A . 
           [0045]      FIG. 3  is a perspective view of part of the system of  FIG. 1A . 
           [0046]      FIG. 4  is a perspective view of a shale tank of the system of  FIG. 1A . 
           [0047]      FIG. 5A  is a side view of a power apparatus for raising a centrifuge support of the system of  FIG. 1A . 
           [0048]      FIG. 5B  is a side view showing the apparatus of  FIG. 5A  extended. 
           [0049]      FIG. 5C  is a side view showing the apparatus of  FIG. 5A  extended. 
           [0050]      FIG. 6A  is a schematic view of a system according to the present invention. 
           [0051]      FIG. 6B  is a schematic view of a system according to the present invention. 
           [0052]      FIG. 6C  is a side schematic view of the system of  FIG. 6B . 
           [0053]      FIG. 6D  is a side cross-section view of part of the system of  FIG. 6B . 
           [0054]      FIG. 7  is a side schematic view of a system according to the present invention. 
       
    
    
       [0055]    Presently preferred embodiments of the invention are shown in the above-identified figures and described in detail below. Various aspects and features of embodiments of the invention are described below and some are set out in the dependent claims. Any combination of aspects and/or features described below or shown in the dependent claims can be used except where such aspects and/or features are mutually exclusive. It should be understood that the appended drawings and description herein are of preferred embodiments and are not intended to limit the invention or the appended claims. On the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the appended claims. In showing and describing the preferred embodiments, like or identical reference numerals are used to identify common or similar elements. The figures are not necessarily to scale and certain features and certain views of the figures may be shown exaggerated in scale or in schematic in the interest of clarity and conciseness. 
         [0056]    As used herein and throughout all the various portions (and headings) of this patent, the terms “invention”, “present invention” and variations thereof mean one or more embodiment, and are not intended to mean the claimed invention of any particular appended claim(s) or all of the appended claims. Accordingly, the subject or topic of each such reference is not automatically or necessarily part of, or required by, any particular claim(s) merely because of such reference. So long as they are not mutually exclusive or contradictory any aspect or feature or combination of aspects or features of any embodiment disclosed herein may be used in any other embodiment disclosed herein. No feature, aspect, step or element is critical or essential to the invention unless it is specifically referred to herein as “critical” or “essential.” 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0057]      FIGS. 1A and 1B  illustrate a system  10  according to the present invention which has a base which is a skid  12  removably positioned on a trailer  14 . Fluid to be treated (including, but not limited to, spent drilling fluid with drilled cuttings and/or solids therein) is pumped from an active rig system ARS to a first holding tank  30 . A pump  42  pimps fluid from a tank  31  to an active rig pumping system ARS. Flocculant and coagulant is mixed in aqueous solution in the tank  21  with an agitator or impeller  21   a  (shown schematically) in the tank. The coagulant, e.g. but not limited to calcium nitrate—CaNO 3 , makes the fluid more of a fluidic semi-solid mixture. A pump or pumps  20  (shown schematically) in a doghouse enclosure  16  pump the fluid-flocculant mixture from the tank  21  to the first holding tank  30 ; and, optionally, to a centrifuge or centrifuges as described below in detail. The doghouse enclosure  16  may also have: pumps for the flocculant mixture  16   a;  impeller controls  16   b;  hydraulic controls  16   c  for power apparatus  78 ; and/or a heater  16   d.  Solids that settle down in the tank  30  are pumped by the pump  40  (shown schematically) to a centrifuge  50  (shown schematically,  FIGS. 1A ,  1 B). Water from the upper part of the tank  30  overflows via water flow apparatus, a baffle  32 , to the tank  31 . Relatively clean water from a feed well  31   w  is pumped by the pump  42 , e.g. to storage or to the active rig system ARS. Any desired number of tanks like the tanks  30  and/or  31  may be used. 
         [0058]    A sensor system  42   s  signals the pump  42  to control the amount of water sent to the rig system ARS. Solids with some fluid from the lower part of the tank  31  (and from lower the part of the tank  30 ) are pumped by the pump  40  to the centrifuge  50  (one or two or more centrifuges  50  may be used). Relatively clean water from the upper part of the tank  30  flows via the baffle  32  to the tank  31  and is then pumped to the active rig system ARS by the pump  42 . Fluid (including water and some drilling fluid) with solids in it is pumped by the pump  40  to the centrifuge  50 . In one aspect the tanks  30  and  31  have conical bottoms  30   c  and  31   c,  respectively, to facilitate solids movement and flow. 
         [0059]    Centrifuge underflow (drilled solids separated in the centrifuge by centrifugal force) flows from the centrifuge  50  down into a tank  60 . This underflow is then transferred to a holding tank or pit for storage and/or further treatment. 
         [0060]    The system  10  includes a structure  70  with a plurality of interconnected beams, members, bars, supports and pieces  70   p.  Some of these pieces  70   p  form upper walkways  70   w  and hand rails  70   h.    
         [0061]    To buttress the system  10  and the structure  70  during transport and movement, a removable brace apparatus  80  is releasably connected to the structure  70  and to the skid  12 . The apparatus  80  includes four beams  82  each with an end  83  releasably connected to the skid  12  and with another end  84  releasably connected to the structure  70 . As shown in  FIG. 1D  a removable pin  85  releasably secures an end  83  to the skid  12 . Pins  87  releasably secure the ends  85  to the structure  60 . The pins are removed and the beams  82  are removed following positioning of the system at a site. Four beams  82  are shown, but two, three, five, six or more can be used. The beams  82  do not prevent erection of the centrifuge support  74  described below. 
         [0062]    As shown in  FIG. 1G  the structure  70  includes a centrifuge support  74  with legs  75  and  76 . A power apparatus  78  (e.g. an hydraulic piston apparatus powered by an available hydraulic power unit  78   h,  shown schematically,  FIG. 1I ) can raise the centrifuge support  74  up vertically with respect to lower legs  76  of the structure  70 .  FIG. 1I  shows the legs  75  raised with respect to the legs  76 . The legs  75  telescope out of and up from the legs  76 . 
         [0063]      FIG. 1H  shows the centrifuge support  74  in a lowered position and  FIG. 1I  shows it in a raised position. An extension ladder  77  extends upwardly as the centrifuge support  74  is raised. 
         [0064]    The centrifuge  50  produces the underflow described above and a stream  52  of clean drilling fluid which can be fed into a line  50   l  by gravity flow to the line  31   m  for return to the active rig system ARS. 
         [0065]    The tanks  30 ,  31  are shown as “cone” tanks with a bottom shaped to converge solids; but it is within the scope of other aspects of the present invention to use other tanks, e.g. with non-conical bottoms or with flat bottoms. 
         [0066]      FIGS. 1J-1O  illustrate various possibilities according to the present invention for solids discharge from one or two centrifuges on a support  74 .  FIGS. 1J and 1K  show a support  74   a  for one centrifuge  74   k  (shown schematically in dotted lines) with a single solids discharge channel  74   b.    FIGS. 1L and 1M  show a support  74   c  with a single solids discharge channel  74   d.    FIGS. 1N and 1O  show a support  74   e  with two solids discharge channels  74   f,    74   g  for centrifuges  74   m,    74   n  (in dotted lines) (or alternatively,  74   h,    74   i —shown in dotted lines). Any two discharges shown in  FIG. 1O  may be used. 
         [0067]    In certain particular aspects the overall footprint of a system according to the present invention is 42 feet by 8 feet and the footprint of one particular old system is 40 feet by 32 feet. 
         [0068]      FIGS. 5A-5C  illustrate various positions for the hydraulic ram apparatus  78 . 
         [0069]      FIG. 6A  shows schematically a system  100  like the system of  FIG. 1A . Two centrifuges  101 ,  102  are like the centrifuge  50 ; and tanks  130 ,  131  correspond, respectively, to the tanks  30 ,  31 . A tank  160  corresponds to the tank  60 ; a pump  142  corresponds to the pump  42 ; and an active rig system ART corresponds to the active rig system ARS. 
         [0070]    As shown in  FIG. 6A  the system  100  is useful, e.g. in typical drilling operations. A slurry from the active rig system ART fed to the tank  130  with solids material therein is pumped by a pump  151  to the centrifuge  101  in a feed line  137 . The underflow (with solids and drilled solids) from the centrifuge  101  is gravity fed to the tank  160 . The overflow from the centrifuge  101  is gravity fed to the tank  130  or back to the system ART. From the tank  130 , a pump  152  pumps fluid with solids in a feed line  135  to the centrifuge  102 . Overflow from the centrifuge  102  flows by gravity to the active rig system ART or to the tank  130 . Underflow from the centrifuge  102  flows to the tank  160 . 
         [0071]    The tank  130  can overflow to the tank  131  via a baffle  132 . 
         [0072]    The centrifuge overflows of centrifuges  101  and  102  are primarily cleaned fluid and the underflows contain drill solids for return to the tank  160 . Pump suction from the pump  151  and/or the pump  152  is applied to the line  133  to pump from both tanks  130  and  131 . 
         [0073]    Relatively clean fluid is pumped by the pump  142  in a line  144  to the active rig system ART. 
         [0074]    In one particular aspect the system  100  is used for barite recovery, as shown in  FIGS. 6B and 6C . A slurry from the active rig system ART with barite material therein is pumped from a line  138  by the pump  151  in the line  137  to the centrifuge  101 . The underflow (primarily barite and/or drilled solids) is jetted by a line  137  and is gravity fed to the system ART in a line  139 . The overflow from the centrifuge  101  is gravity fed in the line  134  to the tank  130 . Material from the tank  130  is pumped by the pump  152  in the line  135  to the centrifuge  102 . Overflow from the centrifuge  102  flows by gravity to the system ART. Underflow from the centrifuge  102  flows to the tank  160 . 
         [0075]    Centrifuge  101  underflow contains recoverable barite which is returnable to the active rig system ART. The jet line  107  is fed by the line  137 . The jet line  107  is a line with pressurized fluid for inhibiting plugging by barite and for moving the barite to the system ART. In one aspect fluid from the line  137  is oil based fluid at about 25 psi.  FIG. 6D  illustrates the exit of barite solid particles from the centrifuge  101 . This barite flows by gravity or is pumped. 
         [0076]      FIG. 7  shows one particular embodiment for the tanks  30 ,  31  and associated pumps  40  and  42 . Slurry from the active rig system is introduced into the tank  30  via an inlet  30   r.  The slurry contains drilling fluid, drill solids or drilling solids (desirable solids added to drilling fluid), drilled solids (e.g. drilled cuttings) and debris. The mixture from the tank  21  is fed to the tanks  30 ,  31  (“FLOC MIX ENTRY”). The pump  40  pumps a mixture of solids and some other components to the centrifuge(s)  50 . The pump  42  pumps water from the tank  31  back to the active rig system ARS. The pump  42  is connected to, and in fluid communication with, the feed well of the tank  31 . Water pumped by the pump  42  comes to it directly from the feed well of the tank  31 . 
         [0077]    Optionally, agitators ADJ with impellers L agitate the fluid in the tanks. 
         [0078]    The present invention, therefore, provides in at least certain embodiments, a system for well fluid treatment, the system being transportable, the system including: a base; a support structure on the base; a brace apparatus connected to the base and to the support structure for bracing the support structure during movement of the system, the brace apparatus releasably secured to the support structure and releasably secured to the base; at least one holding tank on the base for holding well fluid to be treated, the well fluid to be treated from an active rig well fluid system and the well fluid to be treated including solids; centrifuge apparatus for centrifuging a mixture of well fluid and solids from the at least one holding tank, producing a reusable component of the well fluid; a first pump apparatus for pumping well fluid and solids from the at least one holding tank to the centrifuge apparatus; and a centrifuge support on the base for supporting the centrifuge apparatus. Such a system may have one or some, in any possible combination, of the following: a mixing tank for mixing materials in aqueous solution for introduction to well fluid in the at least one holding tank, and a second pump apparatus for pumping materials in aqueous solution from the mixing tank to the at least one holding tank; wherein the materials in aqueous solution include flocculant and coagulant; raising apparatus connected to the centrifuge support for raising the centrifuge support and the centrifuge apparatus to a desired height; wherein the raising apparatus raises the centrifuge support up vertically; wherein the raising apparatus includes hydraulically powered piston apparatus for raising the centrifuge support; wherein the at least one holding tank has a conical bottom for facilitating solids concentration and movement; the at least one holding tank is two holding tanks including a first holding tank, a second holding tank adjacent the first holding tank, the second pump apparatus pumping the materials in aqueous solution into the first holding tank, and the first holding tank receiving the well fluid to be treated; water flow apparatus via which water is flowable from the second holding tank to the first holding tank; a third pump apparatus for pumping water from the first holding tank; wherein the third pump apparatus pumps the water to one of the active rig well fluid system and storage; wherein the well fluid to be treated includes drilled solids and the centrifuge apparatus produces an overflow of cleaned well fluid for feed back to the active rig well fluid system, and the centrifuge apparatus produces an underflow of drilled solids; the centrifuge apparatus includes a plurality of centrifuges for processing fluid with solids from the at least one holding tank; wherein the well fluid to be treated contains recoverable barite solids and the centrifuge apparatus produces an underflow with recovered barite solids for feed to the active rig well fluid system, and the centrifuge apparatus produces an overflow for feed to the at lest one holding tank; and/or a jet line for providing fluid under pressure to the recovered barite solids to facilitate flow of the recovered barite solids to the active rig well fluid system. 
         [0079]    The present invention, therefore, provides in at least certain embodiments, a system for well fluid treatment, the system being transportable, the system including: a base; a support structure on the base; a brace apparatus connected to the base and to the support structure for bracing the support structure during movement of the system, the brace apparatus releasably secured to the support structure and releasably secured to the base; at least one holding tank on the base for holding well fluid to be treated, from an active rig well fluid system and the well fluid to be treated including drilling solids and drilled solids; centrifuge apparatus for centrifuging a mixture of well fluid and solids from the at least one holding tank, producing reusable drilling solids; a first pump apparatus for pumping well fluid and drilling solids from the at least one holding tank to the centrifuge apparatus; a centrifuge support on the base for supporting the centrifuge apparatus; a mixing tank for mixing materials in aqueous solution for introduction to well fluid in the at least one holding tank; a second pump apparatus for pumping materials in aqueous solution from the mixing tank to the at least one holding tank; and wherein the materials in aqueous solution include flocculant and coagulant. 
         [0080]    The present invention, therefore, provides in at least certain embodiments, a method for treating well fluid with drilling fluid, drilled solids, and drilling solids therein, the well fluid from an active rig well fluid system, the method including providing well fluid to a well fluid treatment system from an active rig well fluid system, the well fluid treatment system as any described or claim herein according to the present invention, and producing reusable material with the centrifuge apparatus of the well treatment system. Such a method may have one or some, in any possible combination, of the following: the centrifuge apparatus producing a stream of reusable drilling solids, and returning the stream of reusable drilling solids to the active rig well fluid system; and/or the centrifuge apparatus producing a stream of reusable fluid, and returning the stream of reusable fluid to the active rig well fluid system. 
         [0081]    The present invention, therefore, provides in at least certain embodiments, a method for transporting a well fluid treatment system, the well fluid treatment system including well fluid treatment apparatuses secured to a support structure, the support structure secured to a base, the method including connecting bracing apparatus releasably to the base and to the support structure to brace the well fluid treatment system during movement of the well fluid treatment system. 
         [0082]    The present invention, therefore, provides in at least certain embodiments, a method for moving a centrifuge support with centrifuge apparatus thereon of a well fluid treatment system, the method including raising with raising apparatus the centrifuge support with centrifuge apparatus thereon, said raising being raising the centrifuge support up vertically. 
         [0083]    In conclusion, therefore, it is seen that the present invention and the embodiments disclosed herein and those covered by the appended claims are well adapted to carry out the objectives and obtain the ends set forth. Certain changes can be made in the subject matter without departing from the spirit and the scope of this invention. It is realized that changes are possible within the scope of this invention and it is further intended that each element or step recited in any of the following claims is to be understood as referring to the step literally and/or to all equivalent elements or steps. The following claims are intended to cover the invention as broadly as legally possible in whatever form it may be utilized. The invention claimed herein is new and novel in accordance with 35 U.S.C. §102 and satisfies the conditions for patentability in §102. The invention claimed herein is not obvious in accordance with 35 U.S.C. §103 and satisfies the conditions for patentability in §103. This specification and the claims that follow are in accordance with all of the requirements of 35 U.S.C. §112. The inventors may rely on the Doctrine of Equivalents to determine and assess the scope of their invention and of the claims that follow as they may pertain to apparatus not materially departing from, but outside of, the literal scope of the invention as set forth in the following claims. All patents and applications identified herein are incorporated fully herein for all purposes. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. Thus, although a nail and a screw may not be structural equivalents in that a nail employs a cylindrical surface to secure wooden parts together, whereas a screw employs a helical surface, in the environment of fastening wooden parts, a nail and a screw may be equivalent structures. It is the express intention of the applicant not to invoke 35 U.S.C. §112, paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words ‘means for’ together with an associated function.