Application Areas

    Model SJAT Ⅱ Cement Bond Combination Logging Tool is an ideal instrument mainly used for testing cement bond quality of casing wells.

    1. The tool consists of three parts, that is, CCL (casing collar locator), natural gamma ray tool and dual-transmitter-three-receiver sonic cement bond tool.
    2. kinds of logging signals (CCL signal, gamma signal and cement bond acoustic signal) acquired by combination tool will be transmitted to surface logging system via mono-conductor cable. 
    3. High voltage, low current and little signal attenuation.
    4. Multiple curves such as natural gamma, CCL, 2.5-inch sound amplitude and time difference, 3.5-inch sound amplitude and time difference, bond index, and variable density can be obtained.
    5. The tool is characterized by multiple test parameters, high self-compensation capability and high success rate of logging.

  1.Maximum working pressure---------------100Mpa
  2.Maximum working temperature-------------150℃
  3.OD--------------------------------------Φ70mm
  4.Working voltage (at the cable gland)----------------110VDC
  5.Working current:
     CCL/remote sensing cylinder/ Natural gamma ray tool --------43mA
     Sonic cement bond tool------------- 42mA
  6.Logging Speed: ≤700m/h   recommended speed:600m/h
  7.Natural gamma background counts:≥160cps
  8.Gamma error band of ebb and flow: ≤7%
  9.Length:
     Upper Centralizer--------------------------790mm
     CCL/ remote sensing cylinder / Natural gamma ray tool ----1470mm
     Sonic cement bond tool ----------------------2800mm
     Lower centralizer -------------------------------790mm
  10.Zero Length (from the bottom of the tool):
     Casing collar locator/remote sensing cylinder /Natural Gamma ray tool:
     CCL: 1200mm
     Natural gammy ray tool: 300mm
     Sonic cement bond tool:
     Range1 (X1---R1): 1600mm
       Range 2(X1---R2): 1450mm
       Range 3(X2---R1): 690mm
       Range 4(X2---R2): 530mm
     Variable density or XY recording: 1220mm
  11.Weight:
      Upper centralizer: 6.8kg
     Casing collar locator/remote sensing cylinder /Natural Gamma ray tool: 25kg
     Sonic cement bond tool: 39kg
     Lower centralizer: 6.8kg

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