CN104863632A - Downhole power supplementing system - Google Patents

Abstract

The invention provides a downhole power supplementing system. The downhole power supplementing system comprises a loop formed by connecting wellhead ends of multiple wells through wires or circuits, and the loop is used for supplying power to downhole equipment, wherein the downhole distances of the multiple wells are close, and the loop is formed by connecting the wires or circuits at the wellhead ends of the multiple wells, casings or drill pipes of the multiple wells or downhole formation between the multiple wells. The downhole power supplementing system has the advantages of low cost, high reliability, applicability to deep wells and the like. Specifically speaking, compared with power supply by a battery, the downhole power supplementing system has the characteristic of real-time energy supply, and the whole instrument is not required to be lifted due to the battery, so that a large quantity of cost is saved and the drilling process is accelerated. Compared with an electric generator, the scheme adopts simple equipment and has high stability; compared with wired power supply such as power supply by a cable, the downhole power supplementing system is low in cost, stable and applicable to the deep wells.

Description

Down-hole electric energy replenishment system

Technical field

The present invention relates to petroleum drilling technology field, specifically, the present invention relates to a kind of down-hole electric energy replenishment system.

Background technology

Petroleum industry well logging during (Logging While Drilling) generally refers to measures formation rock physical parameter in the process of drilling well, and with data telemetry system, measurement result is delivered to ground in real time and process.

One of key technology of well logging during how to supply energy to device for subsurface measuring.Common method has three kinds: heavy-duty battery is powered, and down-hole turbogenerator is powered, and wire is powered.The battery-powered advantage of high-performance electric is simple, and cost is low, but shortcoming to be service time limited, be generally will change battery in 150 ~ 200 hours.Each replacing battery, all will draw back ground a whole set of instrument from down-hole, cost dearly.Due to the restriction of modern logging technique, often have in well logging during process because a variety of causes draws back instrument or drill bit, battery powered shortcoming is also not obvious, but once these restrictions are relaxed or disappear, this shortcoming will be fatal.In addition, battery is also subject to temperature limiting (lithium battery temperature requirement is less than 120 degree), and under high temperature, battery and reliability are all affected.Turbine generator method of supplying power to utilizes the fluid pressure in well and flowing to generate electricity, and powers in real time to logger.Contrary with powered battery, generator powered method instrument is complicated, easily infringement (such as silt blocking), and cost is high, but it can continued power, not by time restriction.Increasing well logging during is adopted and is powered in this way.Last one is that wire is powered, and benefit is no time limit, and inactivity limits, and shortcoming is that cable easily damages under HTHP and drilling rod constantly rotate, and can not be applied to deep-well, stable not, cost is large.

Summary of the invention

The object of the invention is the defect overcoming prior art, provide a kind of low cost by earth's surface to underground power supply used or charging solution.

For achieving the above object, the invention provides a kind of down-hole electric energy replenishment system, comprise and (refer to more than two mouthfuls by wire or circuit communication many mouthfuls of wells, comprise two mouthfuls) uphole end (uphole end comprises earth's surface end, also the offshore boring island end of marine drilling platform is comprised) loop that forms, described loop is used for powering to underground equipment.

Wherein, the down-hole of described many mouthfuls of wells apart from close, the loop that described loop is the wire of the uphole end being communicated with described many mouthfuls of wells or circuit, down-hole formation between the sleeve pipe of described many mouthfuls of wells or drilling rod and described many mouthfuls of wells is formed.

Wherein, described underground equipment comprises energy receiving device.

Wherein, loading power on loop is formed at described connection many mouthfuls of wells.

Wherein, described power supply comprises dc source or AC power; Described power supply is battery, generator, or with the extra power network that direct or coupled modes are connected.

Wherein, power supply is arranged on and connects between the wire of many mouthfuls of wells or well on circuit, or is arranged on the other parts in the loop that described connection many mouthfuls of wells are formed.

Wherein, energy receiving device installed by the well drilling rod bored, described energy receiving device accepts the electric current that flows through on neighbouring drilling rod or electromagnetic field produce power near accepting, and is stored with other form of energy by this energy, or directly powers to measuring apparatus with electrical energy form.

Wherein, described energy receiving device is used for charging to down-hole battery.

In one example in which, many mouthfuls of described wells are two mouthfuls of wells.

In one example in which, described well is oil-base mud well.It has relative to adopting the well tools of other mud effect of better powering.

In one example in which, described well has at least one to be high angle hole or horizontal well, the described high angle hole that boring or the drill bit of horizontal well and the down-hole casing of other well close.The scheme of corresponding two peupendicular holes of this scheme has effect of better powering.

Compared with prior art, the present invention has following technique effect: the present invention has low cost, and high reliability can be used for the advantages such as deep-well.Specifically, compared with powered battery, the feature that this technology has real-time power to supply, does not need to mention a whole set of instrument because of battery, thus saves great amount of cost and accelerate drilling course.Compared with generator, program equipment is simple, has high stability.With wired power supply as compared with cable power supply, program less expensive, stable, can be used for deep-well.

Accompanying drawing explanation

Below, describe embodiments of the invention in detail by reference to the accompanying drawings, wherein:

Fig. 1 shows the structural representation of one embodiment of the invention;

Fig. 2 shows the structural representation of another embodiment of the present invention;

Fig. 3 shows the structural representation of another embodiment of the present invention;

Fig. 4 shows the structural representation of another embodiment of the present invention.

Detailed description of the invention

Fig. 1 shows the schematic diagram of the down-hole electric energy replenishment system of one embodiment of the invention.In figure, left side is the well 1 bored, and right side is existing well 2.A and B represents the earth's surface end of well and the existing well bored respectively.A with B is connected by with a wire (also can be complicated circuit), line has been settled power supply 8.Power supply 8 is powered to whole system.Energy receiving device 7 settled by the drilling rod 5 of the well 1 bored.When having electric current through energy receiving device 7, energy receiving device 7 just can obtain energy, and this Power supply device for subsurface measuring or charge the battery.As shown in Figure 1, the electric current that ground large power supply 8 produces is propagated downwards by the sleeve pipe 4 of existing well 2.Because the earth is conductor, continuing current flow flows into stratum from sleeve pipe 4, and forms loop by the drilling rod 5 of well that boring and sleeve pipe 3, flow back into surface power source 8.Wherein, portion of electrical current can pass through sleeve pipe 4, stratum, the drill pipe section near the drill bit 6 of the well that inflow is being bored, more upwards flows through energy receiving device 7 along drilling rod, then flow back into surface power source 8 by sleeve pipe 3.Energy receiving device 7 like this on this loop can receiving portion electric energy, and with this part energy to the charging of down-hole battery or power directly to logger.In the present embodiment, by connecting the well 1 and neighbouring existing well 2 that are boring, thus utilize the sleeve pipe of the well 1 and existing well 2 bored and drilling rod 5 etc. to form current supply circuit, this scheme make use of the sleeve pipe of the existing well 2 with excellent conductive performance dexterously, due to existing well 2 sleeve pipe in depth under, with down-hole energy receiving device 7 and following drill pipe section close together thereof, thus in loop the impedance of layer segment relatively little.In field produces, the distance between the well 1 bored and existing well 2 only has hundreds of rice usually.If the well bored is that water-base mud is bored, power supplying efficiency is formed with geology, the degree of depth of well, and shaft bottom obviously changes apart from the drill bit of the well in operation (and there to be the sleeve pipe distance of well) and receiver change in location.Although most of energy is consumed, according to the result of emulation experiment, still have the electric current of 1% to 5% can by energy receiving device 7, thus power for downhole instrument.Consider that ground Power supply is almost unlimited, it is a kind of feasible to underground power supply used scheme that Energy Transfer is carried out in this loop consisted of many mouthfuls of wells, and this to underground power supply used scheme do not need use cable, do not need complex instrument, there is the advantage such as high stability and low cost.Further, the scheme of the present embodiment can real time charging, does not need to be interrupted drilling well when being down-hole charging.

Fig. 2 shows the schematic diagram of the down-hole electric energy replenishment system of another embodiment of the present invention.The difference of Fig. 2 and Fig. 1 is the well bored in Fig. 2 is oil-base mud well.Because oil-base mud has very high resistance, it shields and flows into the sleeve pipe 3 of the well 1 bored and most of electric current of drilling rod 5 from the side, so more electric current has to flow back to by drill bit 6 well 1 bored, and this part electric current all will flow through energy receiving device 7, can efficiently for downhole instrument is powered or for battery makeup energy.According to the result of emulation experiment, in oil-base mud drilling well, the energy receiving device 7 that surface power source 8 is down-hole provides the efficiency of electric energy usually can reach more than 15%.

Fig. 3 shows the schematic diagram of the down-hole electric energy replenishment system of another embodiment of the present invention, and this system is used in high angle hole or horizontal well.With reference to figure 3, when horizontal well close to existing well 2 or near existing well 2 through out-of-date, the sleeve pipe 4 of drill bit 6 and existing well 2 relatively, between formation resistivity smaller, more electric current (representing with solid arrow) can flow into the drill bit 6 of the well bored and the drill pipe section of energy receiving device less than 7 by the stratum between drill bit 6 and the sleeve pipe 4 of existing well 2, and then is received by energy receiving device 7 and be that downhole instrument is powered or charged the battery.So when high angle hole or horizontal well are near each existing well, can by the system of the present embodiment to downhole instrument makeup energy efficiently.

Fig. 4 shows the schematic diagram of the down-hole electric energy replenishment system of another embodiment of the present invention, in this embodiment, many mouthfuls of neighbouring existing wells 2, 9, the earth's surface end B1 of 10, B2, B3 is connected to form public earth's surface end B4 by wire (or circuit), described public earth's surface end B4 is connected with the earth's surface end A wire of the well 1 bored, many mouthfuls of existing wells 2 like this, 9, the well cover of 10, existing well 2, 9, down-hole formation between 10 and the well 1 bored, the drilling rod of the well 1 bored, and the earth's surface end A of the well 1 bored and each existing well 2, 9, the earth's surface end B1 of 10, B2, wire between B3 forms large current loop jointly.The same with embodiment noted earlier, this loop can be used for as downhole instrument makeup energy, such as, power supply 8 can be placed on the line between public earth's surface end B4 and the earth's surface end A of well 1 bored, energy receiving device 7 be placed on the drilling rod 5 of the well 1 bored.Due to multiple well transmission current simultaneously, be equivalent to formation resistivity and reduce, so energy transmission efficiency is relatively higher.

In above-described embodiment, power supply can be dc source or AC power, in specific implementation, can adopt battery, generator, or in various modes such as direct or coupled modes are connected extra power networks.Being installed as of power supply between the well of connection two mouthfuls of wells on circuit, also can be arranged on the other parts of current supply circuit.

Finally it should be noted that, above embodiment is only in order to describe technical scheme of the present invention instead of to limit this technical method, the present invention can extend in application other amendment, change, application and embodiment, and therefore think that all such amendments, change, application, embodiment are all in spirit of the present invention and teachings.

Claims (11)

1. a down-hole electric energy replenishment system, comprises the loop consisted of the uphole end of wire or circuit communication many mouthfuls of wells, and described loop is used for powering to underground equipment.

2. down-hole according to claim 1 electric energy replenishment system, it is characterized in that, the down-hole of described many mouthfuls of wells apart from close, the loop that described loop is the wire of the uphole end being communicated with described many mouthfuls of wells or circuit, down-hole formation between the sleeve pipe of described many mouthfuls of wells or drilling rod and described many mouthfuls of wells is formed.

3. down-hole according to claim 2 electric energy replenishment system, it is characterized in that, described underground equipment comprises energy receiving device.

4. down-hole according to claim 2 electric energy replenishment system, is characterized in that, on the described loop powered to underground equipment, be loaded with power supply.

5. down-hole according to claim 4 electric energy replenishment system, it is characterized in that, described power supply comprises dc source or AC power; Described power supply is battery, generator, or with the extra power network that direct or coupled modes are connected.

6. down-hole according to claim 4 electric energy replenishment system, is characterized in that, power supply is arranged on and connects between the wire of many mouthfuls of wells or well on circuit, or is arranged on the other parts in the described loop that the described many mouthfuls of wells of described connection are formed.

7. down-hole according to claim 4 electric energy replenishment system, it is characterized in that, the well bored flatly is had at least in described many mouthfuls of wells, energy receiving device installed by the well drilling rod bored, described energy receiving device accepts the electric current that flows through on neighbouring drilling rod or electromagnetic field produce power near accepting, and this energy is stored with other form of energy, or directly power to measuring apparatus with electrical energy form.

8. down-hole according to claim 4 electric energy replenishment system, is characterized in that, described energy receiving device is used for charging to down-hole battery.

9. down-hole according to any one of claim 1 to 8 electric energy replenishment system, is characterized in that, described well is oil-base mud well.

10. down-hole according to any one of claim 1 to 8 electric energy replenishment system, is characterized in that, described well has at least one to be high angle hole or horizontal well, and the down-hole casing of the high angle hole bored or the drill bit of horizontal well and other well is close.

11. down-hole according to any one of claim 1 to 8 electric energy replenishment systems, is characterized in that, described many mouthfuls of wells are two mouthfuls of wells.