Cement paste system choosing method capable of preventing oil, gas and water from channeling

A cement slurry, oil-gas-water technology, which is applied in chemical instruments and methods, earthwork drilling, and drilling compositions, etc., can solve the problems of affecting the quality of cement slurry in the oil zone, long cement slurry solidification time, and high probability of water channeling

Active Publication Date: 2012-05-09
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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Problems solved by technology

③The burial depth of the oil reservoir is relatively shallow, affected by temperature and pressure, the cement slurry solidifies for a long time, and the probability of water channeling is high
What's more serious is that during the drilling and cementing operations, the adjacent wells in the same well site did not stop injecting and producing, and the construction party refused to accept our request to stop injecting, which a...

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  • Cement paste system choosing method capable of preventing oil, gas and water from channeling
  • Cement paste system choosing method capable of preventing oil, gas and water from channeling
  • Cement paste system choosing method capable of preventing oil, gas and water from channeling

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Embodiment Construction

[0025] A method for selecting a cement slurry system for preventing oil, gas and water channeling, which selects the cement slurry system according to the following conditions.

[0026] (1) For the target layer with short oil layer sealing section and shallow oil reservoir depth, the formula of quick-setting early-strength cement can be used. On the premise of ensuring the safety of cementing construction, its shorter thickening time and shorter Strong thixotropy, the cement slurry can quickly hydrate and solidify after being injected into the target layer quickly, forming a strong early strength and preventing the formation fluid from invading.

[0027] Quick-setting early-strength cement slurry formula: G-grade cement + (accounting for cement weight: water-locking agent × 2% + drag reducer × 0.2%), water-cement ratio 0.44, 55°C, 25MPa, initial consistency 26BC, thickening time 50Min .

[0028] (2) For the target layer with complex formation, abnormal interlayer pressure and...

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Abstract

The invention relates to a cement paste system capable of preventing oil, gas and water from channeling, in particular to a cement paste system choosing method capable of preventing oil, gas and water from channeling. The cement paste system choosing method is characterized in that (1) aiming layers with short oil layer sealing sections and shallow oil pool burial depth can choose a rapid hardening cement formula; (2) aiming layers with complex stratums, abnormal interlayer pressure and active stratum fluid can choose a water loss reduction coagulation promoting formula, water loss reduction expansion cement paste formula, a right angle densification performance formula, or a water loss reduction expansion early strength cement paste formula; (3) aiming layers with large oil layer span, long sealing sections and abnormal interlayer pressure can choose three coagulation cement paste system according to pressure stabilization principle. The cement paste system choosing method can prevent pressure leakage stratums and guarantee fluid of pressure stabilization stratums.

Description

technical field [0001] The invention relates to a cement slurry system for oil field cementing to prevent oil and gas water channeling, in particular to a method for selecting a cement slurry system for preventing oil and gas water channeling. Background technique [0002] With the development of Changqing Oilfield, in order to further tap the potential of the oilfield, improve the development effect and recovery rate, adjustment work must be carried out, and the wells drilled for oilfield adjustment are adjustment wells. Compared with the basic well pattern in which the oil and gas layers were in the original state in the early stage of oilfield development, adjustment wells have many problems such as complex downhole pressure system and mutual influence of adjacent wells, and the cementing quality is not easy to guarantee. In recent years, more and more wells have been adjusted and updated in the Changqing area, and the difficulty of cementing has become more and more diff...

Claims

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Application Information

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IPC IPC(8): E21B33/13C09K8/42
Inventor 贾芝王大权武美平邢鹏举冯旺成冯文革毕庆丰
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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