Project Case Study: Yongye-1HF Well

 (Translation based on provided Chinese technical summary)

1. Time & Location

 Time: August 23 – September 4, 2015, and October 17 – October 27, 2015

Location: Group 2, Guanyinjing Village, Laisu Town, Yongchuan District, Chongqing

Structural Position: Southeastern slope of the Yongchuan Xindianzi Structure, Southern Low Fold Belt, Sichuan Basin

2. Project Overview

  Yongye-1HF is a shale gas development horizontal well operated by Sinopec Chongqing Drilling.

Target Formation: Southeastern slope of the Yongchuan Xindianzi Structure.

Intervals: 3605–3782 m and 5116–5536 m.

Design Inclination: 90°.

This well represented a critical exploratory pilot well for LWD services in Chongqing Drilling’s shale gas operations.

3. Operation Summary

  The block features complex formations, oil‑based mud (OBM), high density, and high temperatures.

First Run: Zhongtian Qiming’s LWD tools successfully completed the 3605–3783 m section in two runs.

Challenge: Prior to the second run, six consecutive runs using Baker Hughes LWD tools experienced failures, including loss of signal during testing, no signal at bottom, and inaccurate   data upon reaching TD. These issues caused a two‑week standstill.

Solution: Under these constraints, Zhongtian Qiming’s LWD‑650 was deployed and successfully drilled the interval from 5116 m to 5265 m.

Data Validation: Comparison between Zhongtian Qiming’s LWD data and Baker Hughes data showed consistent results for Resistivity, Gamma Ray, Inclination, and Azimuth.

4. Client Feedback

On October 27, 2015, the section was successfully completed. Key outcomes included:

Enhanced drill string life and overall drilling efficiency.

Effective reduction of single‑well drilling costs and schedule compression for Chongqing Drilling.

Successful verification of the accuracy and stability of Zhongtian Qiming’s LWD data versus industry benchmarks.

Demonstrated a significant technological advancement for the company’s LWD capabilities.