On-site treatment process of starch-based drilling fluid

A technology for on-site treatment and drilling fluid, which is applied in the direction of drilling composition, earthwork drilling, flushing wellbore, etc. It can solve the problem that the temperature resistance of drilling fluid is only 150°C

Active Publication Date: 2021-07-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the drilling fluid temperature resistance is only 150 ℃

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Well SHX84 is a key regional exploration well in the SN block. Three sets of strata oil and gas layers are drilled. There is a risk of leakage in two sets of diabase formations in the Dainan Formation and the third member of the Funing Formation. Instability, the 2,958-meter-long open hole section is prone to sticking, and the long open hole section is easily cleaned to form a cuttings bed, and the 8-time layer-fixed continuous coring in the tight oil well section is not stuck, no sand settling, and no core plugging. For this reason, the well was drilled to 2680 meters and converted into a high-temperature resistant starch-based drilling fluid on the basis of water-based polymer drilling fluid. According to the process requirements, 0.5% high-temperature resistant environmentally friendly starch, 0.3% polyamine inhibitor and 1% Polymer alcohol anti-slump agent, and at the same time supplement formula materials according to the above-mentioned specific implementation meth...

Embodiment 2

[0040] H31-2 is a development directional well in the YZ block, which is a multi-target well with three targets. There are hard and brittle mudstones in the Dainan Formation that are prone to well wall instability, and the 3,261-meter-long open hole section is prone to sticking and wellbore purification. When the well was drilled to 2850 meters, the water-based polymer drilling fluid was converted into a high-temperature resistant starch-based drilling fluid. According to the process requirements, 0.5% high-temperature resistant environmentally friendly starch, 0.4% polyamine inhibitor and 1% polyalcohol anti-corrosion were added. At the same time, according to the above-mentioned specific implementation method, formula materials are supplemented for performance maintenance, and 1% starch microspheres are added to the well section of the reservoir to protect the oil and gas layers. After conversion, it has been drilled to 3710 meters, and the highest density is 1.33g / cm 3 , th...

Embodiment 3

[0042] Y55 is a key pre-exploration well deployed in the hidden oil and gas reservoirs in the deep sag zone in the south of Block Y. The second open hole section is 2,938 meters long. There is a risk of leakage of Sanduo Formation basalt in this well. The lower part of the Dai 2 Member and the Dai 1 Member in the deep well section are dark gray Fractures are well developed in brittle mudstone, which can easily collapse and fall off. Y55 was drilled to 2900 meters. According to the technical requirements, 0.8% high temperature resistant environmental protection starch, 0.5% polyamine inhibitor and 1.5% polyalcohol anti-slump agent were added. At the same time, formula materials were supplemented according to the above specific implementation methods for performance maintenance. The reservoir well section Add 2% starch microspheres to protect oil and gas layers. After the transformation, the drill has been drilled to 3736 meters, and the implemented density is 1.42g / cm 3 , the ...

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Abstract

The invention discloses an on-site treatment process of starch-based drilling fluid. The on-site treatment process comprises the steps of mixing adjustment, performance maintenance, reservoir protection, well completion preparation and the like, by utilizing the treatment process, the drilling fluid treatment can be simplified, the drilling fluid performance is not greatly fluctuated, the performance is easy to maintain, the temperature-resistant, plugging and anti-collapse effects of the drilling fluid are improved, the oil and gas discovery of a deep well is facilitated, meanwhile, environment protection is facilitated, labor intensity is reduced, and energy-saving and environment-friendly requirements are met.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling engineering, and in particular relates to an on-site treatment process of starch-based drilling fluid that can be used for deep well drilling operations in environmentally sensitive areas. Background technique [0002] In recent years, the oil and gas exploration industry has gradually developed into deep and difficult-to-develop subterranean reservoirs. At the same time, due to the needs of ground conditions, drilling fluids are required to have good high-temperature resistance, environmental protection, plugging and anti-collapse performance during construction. [0003] At present, the drilling fluid system with "three sulfur" materials as the core treatment agent is still used for deep well drilling in China. This system has good performance in temperature resistance, plugging and anti-collapse, and can effectively prevent deep wells from complex occurrences. However, due to the lim...

Claims

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Application Information

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IPC IPC(8): E21B21/06C09K8/035C09K8/08
CPCE21B21/06C09K8/035C09K8/08
Inventor 徐浩睢文云谢鑫杨小敏
Owner CHINA PETROLEUM & CHEM CORP
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