Self-plugging removal carbonate reservoir drill-in fluid

A self-plugging technology for carbonate reservoirs, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve the problems of strong heterogeneity and uncertainty of fracture opening in carbonate reservoirs , Reservoir permeability reduction and other issues, to achieve excellent leakage prevention and plugging ability while drilling, excellent reservoir protection performance, good filtration loss and wall building effect

Active Publication Date: 2014-06-04
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key technical problems faced by drilling carbonate reservoirs include: ① Carbonate reservoirs are highly heterogeneous, reservoirs have well-developed pores and fractures, and the opening of fractures is uncertain, leading to serious leakage problems
②Due to the development of fractures, carbonate reservoirs are extremely vulnerable to external fluid and solid phase damage, including the incompatibility between the drilling fluid filtrate and formation water that invaded the formation, and the physical and chemical interaction between the drilling fluid filtrate and formation minerals to produce precipitation, resulting in reservoir seepage Reservoir ...

Method used

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  • Self-plugging removal carbonate reservoir drill-in fluid
  • Self-plugging removal carbonate reservoir drill-in fluid
  • Self-plugging removal carbonate reservoir drill-in fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1, self-plugging carbonate reservoir drilling fluid

[0065] The composition of the self-plugging carbonate reservoir drilling fluid in this embodiment is as follows (all parts by mass):

[0066] 100 parts of water, 4 parts of cationic starch FLOCAT, 0.3 parts of low-viscosity polyanionic cellulose PAC-LV, 0.35 parts of high-viscosity polyanionic cellulose PAC-HV, 0.3 parts of potassium chloride, 0.2 parts of sodium hydroxide, 0.2 parts of sodium carbonate 9 parts of composite self-blocking temporary plugging agent, 0.1 part of cetyltrimethylammonium chloride, and 25 parts of sodium formate.

[0067] The composite self-blocking temporary plugging agent used in this example is a mixture of oil-soluble resin temporary plugging agent HS-140 and calcium carbonate, the mass ratio is 1:3, and the calcium carbonate has three particle sizes, each of which is 600 mesh , 800 mesh and 1000 mesh.

[0068] The drilling fluid density of the present embodiment is 1.15g / cm...

Embodiment 2

[0069] Embodiment 2, self-plugging carbonate reservoir drilling fluid

[0070] The composition of the self-plugging carbonate reservoir drilling fluid in this embodiment is as follows (all parts by mass):

[0071] 100 parts of water, 3.5 parts of carboxymethyl starch CMS, 0.6 parts of low viscosity carboxymethyl cellulose CMC-LV, 0.35 parts of xanthan gum, 0.3 parts of potassium chloride, 0.2 parts of sodium hydroxide, 0.2 parts of sodium carbonate, 14 parts of self-blocking temporary plugging agent, 100.1 parts of alkylphenol polyoxyethylene ether OP-100.1 parts, lubricant SD-5051 parts, 24 parts of 600 mesh calcium carbonate weighting agent.

[0072] The self-blocking temporary plugging agent used in this example is a mixture of oil-soluble asphalt temporary plugging agent BC-6 and calcium carbonate, the mass ratio is 1:4, and the calcium carbonate has two particle sizes, 800 mesh and 1000 mesh respectively. head.

[0073] The drilling fluid density of the present embodime...

Embodiment 3

[0090] Embodiment 3, self-plugging carbonate reservoir drilling fluid

[0091] The composition of the self-plugging carbonate reservoir drilling fluid in this embodiment is as follows (all parts by mass):

[0092] Self-unplugging carbonate reservoir drilling fluid prepared in Example 1 (100 parts of water), 3.5 parts of acid-soluble fiber XHD, 32 parts of acid-soluble fiber DL-932, mica flakes (particle size 1-3mm) 1.5 parts, 2 parts fruit shell (particle size 2mm), 4 parts superfine calcium carbonate (200-400 mesh).

[0093] The purpose of the self-removing plugging fluid for drilling carbonate rock reservoirs prepared in Example 3 is to improve the leakage prevention and plugging ability of the drilling fluid while drilling when drilling large-opening fractured reservoirs or when fractured leakage has occurred.

[0094] The effect of the self-unplugging carbonate reservoir drilling fluid prepared in Example 3 is tested below.

[0095] The plugging effects of the reservoir ...

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Abstract

The invention discloses a self-plugging removal carbonate reservoir drill-in fluid. The self-plugging removal carbonate reservoir drill-in fluid comprises the following components in parts by weight: 100 parts of water, 5-16 parts of compound type self-plugging removal temporary plugging agent, 2-6 parts of fluid loss additive, 0.1-0.8 part of tackifier, 0.1-0.5 part of pH regulator, 0.1-0.5 part of waterproof locking agent, 0-7 parts of potassium chloride and 0-230 parts of weighting agent, wherein the addition amount of the weighting agent is greater than zero. The self-plugging removal carbonate reservoir drill-in fluid disclosed by the invention is reasonable in rheological property, can meet the rheological property requirements of drilling reservoirs of vertical shafts, directional wells and horizontal wells and has good fluid loss well building property. The self-plugging removal carbonate reservoir drill-in fluid has strong capacity of resisting pollution of acid gas such as H2S and CO2, excellent reservoir protection performance and good compatibility with a formation fluid, and the carbonate rock core return permeability of the self-plugging removal carbonate reservoir drill-in fluid is greater than 87%; and a gel breaker is not needed, and the self-plugging removal carbonate reservoir drill-in fluid can be used for direct plugging removal through acid pickling and putting into production.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a drilling fluid for self-blocking carbonate rock reservoirs. Background technique [0002] Carbonate rock is an extremely important oil and gas reservoir. According to statistics, the oil and gas production of carbonate rock reservoirs in the world accounts for about 60% of the total oil and gas production. The lithology of this type of reservoir is mainly limestone and dolomite, with good storage properties. There are extremely rich carbonate rock reservoirs in the Middle East, North America, Siberia, as well as the Tarim Basin, Sichuan Basin and North China Plain in my country. Of great value to the petroleum industry. The key technical problems faced by the drilling of carbonate reservoirs include: (1) Carbonate reservoirs are highly heterogeneous, with well-developed reservoir holes and fractures, and the opening of fractures is uncertain, leading to serious leakage problems. ②Due to the...

Claims

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Application Information

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IPC IPC(8): C09K8/12C09K8/03
CPCC09K8/10C09K8/12C09K8/5045C09K8/514C09K2208/04C09K2208/34
Inventor 刘书杰邢希金周建良邱正松赵欣黄维安周国伟张永君钟汉毅
Owner CHINA NAT OFFSHORE OIL CORP
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