CN208675253U - A kind of communicating circuit between downhole instrument and ground control system - Google Patents

Abstract

The utility model discloses the communicating circuits between a kind of downhole instrument and ground control system, main bus including connecting downhole instrument and ground control system, main bus is connect through polarity isolation transformer with polarity switching input terminal, the monopole output end of polarity switching is encoded/and decoder, gate circuit and signal processing circuit connect, signal processing circuit is connected through gate circuit, coder/decoder and coder/decoder, coder/decoder is connect through signal drive circuit and driving isolating transformer with main bus, and signal is delivered to downhole instrument by main bus.The utility model eliminates address latch in the prior art, shift register, and the use of a large amount of discrete devices such as trigger reduces the power consumption and heat dissipation of communicating circuit, effectively reduces the work load and hardware cost expense of constant temperature system.It is reliable with communication, transmit stable feature.

Description

A kind of communicating circuit between downhole instrument and ground control system

Technical field

The utility model relates to the communicating circuits between a kind of downhole instrument and ground control system, belong to oil well communication skill Art field.

Background technique

With going deep into for oil extraction, oil recovery efficiency is improved, from the drilling well of oil well into the entire life cycle used, is all needed Geological condition variation that is accurate, fully understanding its own situation and periphery, in order to formulate corresponding production program.In oil During well measurements, contacting between downhole instrument and uphole equipment is usually attached by communicating circuit.

The communication electric equipment of import at present is by address latch, shift register, and the discrete components such as trigger are built Graceful Chester communicating circuit, digital signal processing chip access communication interface by parallel port, and parallel port communication is apart from limited and anti-dry Immunity is poor.And since imported product is largely built using discrete component, hardware cost is higher, volume is big and communication power consumption all compared with Greatly, the burden of constant temperature system is increased.

Although domestic existing communication apparatus integrated level is high, use environment under room temperature is mostly only adapted to.Oil field uses ring Border is severe, and under high-temperature and high-pressure conditions, the reliability of communication apparatus transmission is poor, and service life is short, cost of equipment maintenance compared with It is high.

Therefore, the prior art is further improved there is also some defects and deficiency.

Utility model content

The purpose of this utility model is to provide a kind of communicating circuit between downhole instrument and ground control system, with It solves in the harsh environments of underground, the problem that communicating circuit functional reliability is poor, the service life is short, maintenance cost is high, thus gram Take the deficiencies in the prior art.

To achieve the above objectives, the present invention adopts the following technical solutions:

A kind of communicating circuit between the downhole instrument and ground control system of the utility model, including connection downhole instrument With the main bus of ground control system, main bus is connect through polarity isolation transformer with polarity switching input terminal, and polarity turns The monopole output end for changing circuit is encoded/and decoder, gate circuit and signal processing circuit connect, and signal processing circuit is through door electricity Road, coder/decoder and coder/decoder connect, coder/decoder through signal drive circuit and driving isolating transformer and Main bus connection, is delivered to downhole instrument for signal by main bus.

In aforementioned communicating circuit, the coder/decoder is connect with clock circuit.

By adopting the above-described technical solution, the utility model is compared with prior art, the communicating circuit of the utility model Eliminate address latch, shift register, the use of a large amount of discrete devices such as trigger, the power consumption and heat dissipation reduced, Effectively reduce the work load and hardware cost expense of constant temperature system.In the case where not increasing any circuit form, by parallel port Semiduplex mode is designed to serial ports full-duplex mode, effectively increases communication channel, improves Realtime Capability of Communication and reliability.It is logical It interrogates core wire and is reduced to 7 by 15, effectively reduce Interface design burden, simplify circuit design, improve reliability.

Detailed description of the invention

Fig. 1 is the electrical diagram of the utility model；

Fig. 2 is encoding operation timing diagram；

Fig. 3 is decoding operate timing diagram；

Fig. 4 is graceful Chester form schematic diagram；

Fig. 5 is graceful Chester command/data form schematic diagram；

Fig. 6 is M command and data distribution of cable core schematic diagram.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawings and examples.

The utility model is constituted according to the means of communication between a kind of following downhole instruments and ground control system And for this method, as shown in Figure 1, this method is linked together downhole instrument and uphole equipment using main bus, underground It is communicated between instrument and uphole equipment using graceful II coded format of Chester；Downhole instrument is connect by polarity isolation transformer The order or data for meeting graceful II coded format of Chester on main bus is received, order or the number of graceful II coded format of Chester are met Bipolar signal is converted into unipolar signal, unipolar signal warp knit according to for bipolar signal, then by polarity switching Code/decoder is converted into the parallel data that signal processing circuit can be directly read and is sent by gate circuit to signal processing circuit；Through believing Parallel data after number processing circuit processes is encoded again/decoder be converted into meeting the order of graceful II coded format of Chester or Data are sent to signal drive circuit, and are sent by main bus to ground control system by driving isolating transformer.The polarity every Being all made of working frequency range from transformer and driving isolating transformer is 20.83~41.66kHz, and maximum operating temperature is not less than 200 DEG C, turn ratio is the transformer of 1:1.The coder/decoder Intersil company independently operable using coding and decoding The HD1-15530-8 coder/decoder of product.Coder/decoder is connect with clock circuit；The clock source of clock circuit uses 4M Clock source is two kinds of clocks of 250k and 500K through 12 asynchronous counters frequency dividings, when being supplied to coder/decoder and sending Clock and reception clock.

A kind of downhole instrument and ground control system of the utility model of the above method are constituted and are used for according to the above method Communicating circuit between system, as shown in Figure 1, the communicating circuit includes the main bus for connecting downhole instrument and ground control system, Main bus is connect through polarity isolation transformer with polarity switching input terminal, the monopole output end warp knit of polarity switching Code/decoder, gate circuit and signal processing circuit connect, and signal processing circuit is through gate circuit, coder/decoder and coding/solution Code device connection, coder/decoder connect with main bus through signal drive circuit and driving isolating transformer, will be believed by main bus Number it is delivered to downhole instrument.Coder/decoder is connect with clock circuit.

Embodiment

This example communicating circuit, which is mainly responsible for from the main bus reception of connection ground control system, meets the graceful coding of Chester II Order is converted to the parallel data that signal processing circuit can be directly read by the order or data of format, then signal processing is electric The order or data that the parallel data sent out is converted to graceful II coded format of Chester after the processing of road send to ground control system and Downhole instrument.

The communicating circuit of this example is as shown in Figure 1, mainly by polarity isolation transformer, polarity switching, coding/decoding Device, gate circuit, signal processing circuit, signal drive circuit, driving isolating transformer and clock circuit are constituted.Communicating circuit work In distal end (RT) mode.

Clock circuit in this example uses 4M clock source, is 250k and two kinds of 500K through 12 asynchronous counter frequency dividings Clock is supplied to coder/decoder and makees tranmitting data register and receive clock, and counter uses the SN54HC4040J of TI company, the device Part has the low input current no more than 1uA, and output can drive up to 10 LSTTL to load, the wide operating voltage of 2V to 6V, The impulse time delay of 12ns, has the characteristics of low-power consumption, the operating current no more than 80uA.

Polarity isolation transformer and driving isolating transformer in this example belong to bus isolation circuit.

The HD1-15530-8 of coder/decoder selection Intersil company in this example, the device is by coding and decoding two Part forms, and other than utility power and reset function, codes and decodes two-part operation and is completely independent, which is satisfied with The application of any MIL-STD-1553 demand, the device have the characteristics that as follows:

1) it is suitable for MIL-STD-1553；

2) data rate: 1.25M；

3) graceful II coding and decoding of Chester；

4) coding/decoding is mutually indepedent；

5) power consumption under the conditions of 25 DEG C are as follows: 50mW；

6) temperature range: -55 DEG C~125 DEG C；

Coder/decoder is in coding, as shown in Fig. 2, encoded clock is two frequencys multiplication of tranmitting data register, when coding enable end When for high level, when coding shift clock is failing edge, code period starts, and it is all that code period continues 20 coding shift clocks Phase, when next coding shift clock rising edge arrives, high level synchronous selection signal causes frame synchronizing signal to be low level, When encoder preparation receives data, sending data end mouth exports high level, and the duration is 16 coding shift clock weeks Phase, in this 16 coding shift clock cycles, data are latched into serial data input port.

Coder/decoder is in decoding, as shown in figure 3, decoding operate needs the unipolarity clock of 12 haplotype data baud rates Source, the clock source are inputted by decoding displacement clock pins, and coder/decoder supports two kinds of input modes of unipolarity and bipolarity, This example uses unipolarity input mode.When decoder continuously monitors 1 synchronization character and 2 effectively from input pin When graceful Chester position, starting decoding implementation procedure, if detecting synchrodata pin output high level and retaining 16 decodings Otherwise shift clock cycle is low level, data output is high level, and continues 16 decoding clock cycle.It is decoded when 16 It after position is transmitted, then carries out posting even parity check, high level output indicates to be properly received a valid data.

Graceful Chester character format used in this example is as shown in figure 4, be made of command synchronization and data synchronizing signal 3 position compositions, data bit are made of logically high and logic low, and the period is a position.

Graceful Chester command/data format is as shown in figure 5, word of this example communicating circuit from remote controller to terminal includes Command word, data word and status word are made of 20 data, and in 16 data bit of command word, most-significant byte is downhole instrument Address bit.That is 8 binary codes address for indicating a kind of downhole instrument.Every kind of downhole instrument have one uniquely The address of location, different downhole instruments is different.

The communicating circuit of this example uses graceful II yard of Chester (abbreviation M2).II yard of graceful Chester includes M2 order and M2 number According to M2 order transmission speed is 20.83KB, and M2 data are 41.66KB, and the two is at 2 frequency multiplication relationships.As shown in fig. 6, the two is transmitted Channel is mutually indepedent, does not interfere with each other.The transmission rate of M2 order and data can all be divided by the integral multiple of 500k clock can be with It realizes, so clock circuit can share 4M clock and be independent of each other, and Synchronization/decoder is functionally mutually only It is vertical, so the two is not interfere with each other, and can be used in conjunction with a clock reference and power supply again, it is mutually matched with signal-processing board.

The communicating circuit of the utility model eliminates address latch, shift register, a large amount of discrete devices such as trigger Use, the power consumption and heat dissipation reduced effectively reduce the work load and hardware cost expense of constant temperature system.Do not increasing In the case where any circuit form, serial ports full-duplex mode is designed to by parallel port semiduplex mode, effectively increases communication channel, Improve Realtime Capability of Communication and reliability.It communicates core wire and is reduced to 7 by 15, effectively reduce Interface design burden, simplify Circuit design improves reliability.

Claims (2)

1. the communicating circuit between a kind of downhole instrument and ground control system, including connection downhole instrument and ground control system Main bus, it is characterised in that: main bus is connect through polarity isolation transformer with polarity switching input terminal, dipole inversion electricity The monopole output end on road is encoded/decoder, gate circuit and signal processing circuit connect, signal processing circuit through gate circuit, compile Code/decoder is connect with coder/decoder, and coder/decoder is through signal drive circuit and driving isolating transformer and main bus Connection, is delivered to downhole instrument for signal by main bus.

2. communicating circuit according to claim 1, it is characterised in that: the coder/decoder is connect with clock circuit.